Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | Copyright (C) 2002 Richard Henderson |
| 3 | Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM. |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 2 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program; if not, write to the Free Software |
| 17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/module.h> |
| 20 | #include <linux/moduleloader.h> |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 21 | #include <linux/ftrace_event.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/init.h> |
Alexey Dobriyan | ae84e32 | 2007-05-08 00:28:38 -0700 | [diff] [blame] | 23 | #include <linux/kallsyms.h> |
Alexey Dobriyan | 3b5d5c6 | 2008-10-06 13:19:27 +0400 | [diff] [blame] | 24 | #include <linux/fs.h> |
Roland McGrath | 6d76013 | 2007-10-16 23:26:40 -0700 | [diff] [blame] | 25 | #include <linux/sysfs.h> |
Randy Dunlap | 9f15833 | 2005-09-13 01:25:16 -0700 | [diff] [blame] | 26 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <linux/slab.h> |
| 28 | #include <linux/vmalloc.h> |
| 29 | #include <linux/elf.h> |
Alexey Dobriyan | 3b5d5c6 | 2008-10-06 13:19:27 +0400 | [diff] [blame] | 30 | #include <linux/proc_fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <linux/seq_file.h> |
| 32 | #include <linux/syscalls.h> |
| 33 | #include <linux/fcntl.h> |
| 34 | #include <linux/rcupdate.h> |
Randy.Dunlap | c59ede7 | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 35 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <linux/cpu.h> |
| 37 | #include <linux/moduleparam.h> |
| 38 | #include <linux/errno.h> |
| 39 | #include <linux/err.h> |
| 40 | #include <linux/vermagic.h> |
| 41 | #include <linux/notifier.h> |
Al Viro | f6a5703 | 2006-10-18 01:47:25 -0400 | [diff] [blame] | 42 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <linux/stop_machine.h> |
| 44 | #include <linux/device.h> |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 45 | #include <linux/string.h> |
Arjan van de Ven | 97d1f15 | 2006-03-23 03:00:24 -0800 | [diff] [blame] | 46 | #include <linux/mutex.h> |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 47 | #include <linux/rculist.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #include <asm/cacheflush.h> |
Bernd Schmidt | eb8cdec | 2009-09-21 17:03:57 -0700 | [diff] [blame] | 50 | #include <asm/mmu_context.h> |
Sam Ravnborg | b817f6f | 2006-06-09 21:53:55 +0200 | [diff] [blame] | 51 | #include <linux/license.h> |
Christoph Lameter | 6d76239 | 2008-02-08 04:18:42 -0800 | [diff] [blame] | 52 | #include <asm/sections.h> |
Mathieu Desnoyers | 97e1c18 | 2008-07-18 12:16:16 -0400 | [diff] [blame] | 53 | #include <linux/tracepoint.h> |
Steven Rostedt | 90d595f | 2008-08-14 15:45:09 -0400 | [diff] [blame] | 54 | #include <linux/ftrace.h> |
Arjan van de Ven | 22a9d64 | 2009-01-07 08:45:46 -0800 | [diff] [blame] | 55 | #include <linux/async.h> |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 56 | #include <linux/percpu.h> |
Catalin Marinas | 4f2294b | 2009-06-11 13:23:20 +0100 | [diff] [blame] | 57 | #include <linux/kmemleak.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
Li Zefan | 7ead8b8 | 2009-08-17 16:56:28 +0800 | [diff] [blame] | 59 | #define CREATE_TRACE_POINTS |
| 60 | #include <trace/events/module.h> |
| 61 | |
| 62 | EXPORT_TRACEPOINT_SYMBOL(module_get); |
| 63 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | #if 0 |
| 65 | #define DEBUGP printk |
| 66 | #else |
| 67 | #define DEBUGP(fmt , a...) |
| 68 | #endif |
| 69 | |
| 70 | #ifndef ARCH_SHF_SMALL |
| 71 | #define ARCH_SHF_SMALL 0 |
| 72 | #endif |
| 73 | |
| 74 | /* If this is set, the section belongs in the init part of the module */ |
| 75 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) |
| 76 | |
Rusty Russell | 24da1cb | 2007-07-15 23:41:46 -0700 | [diff] [blame] | 77 | /* List of modules, protected by module_mutex or preempt_disable |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 78 | * (delete uses stop_machine/add uses RCU list operations). */ |
Tim Abbott | c6b3780 | 2008-12-05 19:03:59 -0500 | [diff] [blame] | 79 | DEFINE_MUTEX(module_mutex); |
| 80 | EXPORT_SYMBOL_GPL(module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | static LIST_HEAD(modules); |
| 82 | |
Stephen Rothwell | 19e4529 | 2009-04-14 17:27:18 +1000 | [diff] [blame] | 83 | /* Block module loading/unloading? */ |
| 84 | int modules_disabled = 0; |
| 85 | |
Rusty Russell | c9a3ba5 | 2008-01-29 17:13:18 -0500 | [diff] [blame] | 86 | /* Waiting for a module to finish initializing? */ |
| 87 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); |
| 88 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 89 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
Rusty Russell | e610499 | 2009-03-31 13:05:31 -0600 | [diff] [blame] | 91 | /* Bounds of module allocation, for speeding __module_address */ |
Rusty Russell | 3a642e9 | 2008-07-22 19:24:28 -0500 | [diff] [blame] | 92 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
| 93 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | int register_module_notifier(struct notifier_block * nb) |
| 95 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 96 | return blocking_notifier_chain_register(&module_notify_list, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | } |
| 98 | EXPORT_SYMBOL(register_module_notifier); |
| 99 | |
| 100 | int unregister_module_notifier(struct notifier_block * nb) |
| 101 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 102 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | } |
| 104 | EXPORT_SYMBOL(unregister_module_notifier); |
| 105 | |
Matti Linnanvuori | 9a4b970 | 2007-11-08 08:37:38 -0800 | [diff] [blame] | 106 | /* We require a truly strong try_module_get(): 0 means failure due to |
| 107 | ongoing or failed initialization etc. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | static inline int strong_try_module_get(struct module *mod) |
| 109 | { |
| 110 | if (mod && mod->state == MODULE_STATE_COMING) |
Rusty Russell | c9a3ba5 | 2008-01-29 17:13:18 -0500 | [diff] [blame] | 111 | return -EBUSY; |
| 112 | if (try_module_get(mod)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | return 0; |
Rusty Russell | c9a3ba5 | 2008-01-29 17:13:18 -0500 | [diff] [blame] | 114 | else |
| 115 | return -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | } |
| 117 | |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 118 | static inline void add_taint_module(struct module *mod, unsigned flag) |
| 119 | { |
| 120 | add_taint(flag); |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 121 | mod->taints |= (1U << flag); |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 122 | } |
| 123 | |
Robert P. J. Day | 02a3e59 | 2007-05-09 07:26:28 +0200 | [diff] [blame] | 124 | /* |
| 125 | * A thread that wants to hold a reference to a module only while it |
| 126 | * is running can call this to safely exit. nfsd and lockd use this. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | */ |
| 128 | void __module_put_and_exit(struct module *mod, long code) |
| 129 | { |
| 130 | module_put(mod); |
| 131 | do_exit(code); |
| 132 | } |
| 133 | EXPORT_SYMBOL(__module_put_and_exit); |
Daniel Walker | 22a8bde | 2007-10-18 03:06:07 -0700 | [diff] [blame] | 134 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | /* Find a module section: 0 means not found. */ |
| 136 | static unsigned int find_sec(Elf_Ehdr *hdr, |
| 137 | Elf_Shdr *sechdrs, |
| 138 | const char *secstrings, |
| 139 | const char *name) |
| 140 | { |
| 141 | unsigned int i; |
| 142 | |
| 143 | for (i = 1; i < hdr->e_shnum; i++) |
| 144 | /* Alloc bit cleared means "ignore it." */ |
| 145 | if ((sechdrs[i].sh_flags & SHF_ALLOC) |
| 146 | && strcmp(secstrings+sechdrs[i].sh_name, name) == 0) |
| 147 | return i; |
| 148 | return 0; |
| 149 | } |
| 150 | |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 151 | /* Find a module section, or NULL. */ |
| 152 | static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs, |
| 153 | const char *secstrings, const char *name) |
| 154 | { |
| 155 | /* Section 0 has sh_addr 0. */ |
| 156 | return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr; |
| 157 | } |
| 158 | |
| 159 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ |
| 160 | static void *section_objs(Elf_Ehdr *hdr, |
| 161 | Elf_Shdr *sechdrs, |
| 162 | const char *secstrings, |
| 163 | const char *name, |
| 164 | size_t object_size, |
| 165 | unsigned int *num) |
| 166 | { |
| 167 | unsigned int sec = find_sec(hdr, sechdrs, secstrings, name); |
| 168 | |
| 169 | /* Section 0 has sh_addr 0 and sh_size 0. */ |
| 170 | *num = sechdrs[sec].sh_size / object_size; |
| 171 | return (void *)sechdrs[sec].sh_addr; |
| 172 | } |
| 173 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | /* Provided by the linker */ |
| 175 | extern const struct kernel_symbol __start___ksymtab[]; |
| 176 | extern const struct kernel_symbol __stop___ksymtab[]; |
| 177 | extern const struct kernel_symbol __start___ksymtab_gpl[]; |
| 178 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; |
Greg Kroah-Hartman | 9f28bb7 | 2006-03-20 13:17:13 -0800 | [diff] [blame] | 179 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
| 180 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; |
Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 181 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
| 182 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | extern const unsigned long __start___kcrctab[]; |
| 184 | extern const unsigned long __start___kcrctab_gpl[]; |
Greg Kroah-Hartman | 9f28bb7 | 2006-03-20 13:17:13 -0800 | [diff] [blame] | 185 | extern const unsigned long __start___kcrctab_gpl_future[]; |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 186 | #ifdef CONFIG_UNUSED_SYMBOLS |
| 187 | extern const struct kernel_symbol __start___ksymtab_unused[]; |
| 188 | extern const struct kernel_symbol __stop___ksymtab_unused[]; |
| 189 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; |
| 190 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; |
Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 191 | extern const unsigned long __start___kcrctab_unused[]; |
| 192 | extern const unsigned long __start___kcrctab_unused_gpl[]; |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 193 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | |
| 195 | #ifndef CONFIG_MODVERSIONS |
| 196 | #define symversion(base, idx) NULL |
| 197 | #else |
Andrew Morton | f83ca9f | 2006-03-28 01:56:20 -0800 | [diff] [blame] | 198 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | #endif |
| 200 | |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 201 | static bool each_symbol_in_section(const struct symsearch *arr, |
| 202 | unsigned int arrsize, |
| 203 | struct module *owner, |
| 204 | bool (*fn)(const struct symsearch *syms, |
| 205 | struct module *owner, |
| 206 | unsigned int symnum, void *data), |
| 207 | void *data) |
Sam Ravnborg | 3fd6805 | 2006-02-08 21:16:45 +0100 | [diff] [blame] | 208 | { |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 209 | unsigned int i, j; |
| 210 | |
| 211 | for (j = 0; j < arrsize; j++) { |
| 212 | for (i = 0; i < arr[j].stop - arr[j].start; i++) |
| 213 | if (fn(&arr[j], owner, i, data)) |
| 214 | return true; |
| 215 | } |
| 216 | |
| 217 | return false; |
Sam Ravnborg | 3fd6805 | 2006-02-08 21:16:45 +0100 | [diff] [blame] | 218 | } |
| 219 | |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 220 | /* Returns true as soon as fn returns true, otherwise false. */ |
Tim Abbott | c6b3780 | 2008-12-05 19:03:59 -0500 | [diff] [blame] | 221 | bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner, |
| 222 | unsigned int symnum, void *data), void *data) |
Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 223 | { |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 224 | struct module *mod; |
| 225 | const struct symsearch arr[] = { |
| 226 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
| 227 | NOT_GPL_ONLY, false }, |
| 228 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
| 229 | __start___kcrctab_gpl, |
| 230 | GPL_ONLY, false }, |
| 231 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
| 232 | __start___kcrctab_gpl_future, |
| 233 | WILL_BE_GPL_ONLY, false }, |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 234 | #ifdef CONFIG_UNUSED_SYMBOLS |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 235 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
| 236 | __start___kcrctab_unused, |
| 237 | NOT_GPL_ONLY, true }, |
| 238 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
| 239 | __start___kcrctab_unused_gpl, |
| 240 | GPL_ONLY, true }, |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 241 | #endif |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 242 | }; |
| 243 | |
| 244 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
| 245 | return true; |
| 246 | |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 247 | list_for_each_entry_rcu(mod, &modules, list) { |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 248 | struct symsearch arr[] = { |
| 249 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, |
| 250 | NOT_GPL_ONLY, false }, |
| 251 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
| 252 | mod->gpl_crcs, |
| 253 | GPL_ONLY, false }, |
| 254 | { mod->gpl_future_syms, |
| 255 | mod->gpl_future_syms + mod->num_gpl_future_syms, |
| 256 | mod->gpl_future_crcs, |
| 257 | WILL_BE_GPL_ONLY, false }, |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 258 | #ifdef CONFIG_UNUSED_SYMBOLS |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 259 | { mod->unused_syms, |
| 260 | mod->unused_syms + mod->num_unused_syms, |
| 261 | mod->unused_crcs, |
| 262 | NOT_GPL_ONLY, true }, |
| 263 | { mod->unused_gpl_syms, |
| 264 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, |
| 265 | mod->unused_gpl_crcs, |
| 266 | GPL_ONLY, true }, |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 267 | #endif |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 268 | }; |
| 269 | |
| 270 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
| 271 | return true; |
| 272 | } |
| 273 | return false; |
Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 274 | } |
Tim Abbott | c6b3780 | 2008-12-05 19:03:59 -0500 | [diff] [blame] | 275 | EXPORT_SYMBOL_GPL(each_symbol); |
Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 276 | |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 277 | struct find_symbol_arg { |
| 278 | /* Input */ |
| 279 | const char *name; |
| 280 | bool gplok; |
| 281 | bool warn; |
| 282 | |
| 283 | /* Output */ |
| 284 | struct module *owner; |
| 285 | const unsigned long *crc; |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 286 | const struct kernel_symbol *sym; |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 287 | }; |
| 288 | |
| 289 | static bool find_symbol_in_section(const struct symsearch *syms, |
| 290 | struct module *owner, |
| 291 | unsigned int symnum, void *data) |
Rusty Russell | ad9546c | 2008-05-01 21:14:59 -0500 | [diff] [blame] | 292 | { |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 293 | struct find_symbol_arg *fsa = data; |
| 294 | |
| 295 | if (strcmp(syms->start[symnum].name, fsa->name) != 0) |
| 296 | return false; |
| 297 | |
| 298 | if (!fsa->gplok) { |
| 299 | if (syms->licence == GPL_ONLY) |
| 300 | return false; |
| 301 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { |
| 302 | printk(KERN_WARNING "Symbol %s is being used " |
| 303 | "by a non-GPL module, which will not " |
| 304 | "be allowed in the future\n", fsa->name); |
| 305 | printk(KERN_WARNING "Please see the file " |
| 306 | "Documentation/feature-removal-schedule.txt " |
| 307 | "in the kernel source tree for more details.\n"); |
| 308 | } |
| 309 | } |
| 310 | |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 311 | #ifdef CONFIG_UNUSED_SYMBOLS |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 312 | if (syms->unused && fsa->warn) { |
Rusty Russell | ad9546c | 2008-05-01 21:14:59 -0500 | [diff] [blame] | 313 | printk(KERN_WARNING "Symbol %s is marked as UNUSED, " |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 314 | "however this module is using it.\n", fsa->name); |
Rusty Russell | ad9546c | 2008-05-01 21:14:59 -0500 | [diff] [blame] | 315 | printk(KERN_WARNING |
| 316 | "This symbol will go away in the future.\n"); |
| 317 | printk(KERN_WARNING |
| 318 | "Please evalute if this is the right api to use and if " |
| 319 | "it really is, submit a report the linux kernel " |
| 320 | "mailinglist together with submitting your code for " |
| 321 | "inclusion.\n"); |
| 322 | } |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 323 | #endif |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 324 | |
| 325 | fsa->owner = owner; |
| 326 | fsa->crc = symversion(syms->crcs, symnum); |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 327 | fsa->sym = &syms->start[symnum]; |
Rusty Russell | ad9546c | 2008-05-01 21:14:59 -0500 | [diff] [blame] | 328 | return true; |
| 329 | } |
| 330 | |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 331 | /* Find a symbol and return it, along with, (optional) crc and |
| 332 | * (optional) module which owns it */ |
Tim Abbott | c6b3780 | 2008-12-05 19:03:59 -0500 | [diff] [blame] | 333 | const struct kernel_symbol *find_symbol(const char *name, |
| 334 | struct module **owner, |
| 335 | const unsigned long **crc, |
| 336 | bool gplok, |
| 337 | bool warn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | { |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 339 | struct find_symbol_arg fsa; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 341 | fsa.name = name; |
| 342 | fsa.gplok = gplok; |
| 343 | fsa.warn = warn; |
| 344 | |
| 345 | if (each_symbol(find_symbol_in_section, &fsa)) { |
Rusty Russell | ad9546c | 2008-05-01 21:14:59 -0500 | [diff] [blame] | 346 | if (owner) |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 347 | *owner = fsa.owner; |
| 348 | if (crc) |
| 349 | *crc = fsa.crc; |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 350 | return fsa.sym; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | } |
Rusty Russell | ad9546c | 2008-05-01 21:14:59 -0500 | [diff] [blame] | 352 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | DEBUGP("Failed to find symbol %s\n", name); |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 354 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | } |
Tim Abbott | c6b3780 | 2008-12-05 19:03:59 -0500 | [diff] [blame] | 356 | EXPORT_SYMBOL_GPL(find_symbol); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | /* Search for module by name: must hold module_mutex. */ |
Tim Abbott | c6b3780 | 2008-12-05 19:03:59 -0500 | [diff] [blame] | 359 | struct module *find_module(const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | { |
| 361 | struct module *mod; |
| 362 | |
| 363 | list_for_each_entry(mod, &modules, list) { |
| 364 | if (strcmp(mod->name, name) == 0) |
| 365 | return mod; |
| 366 | } |
| 367 | return NULL; |
| 368 | } |
Tim Abbott | c6b3780 | 2008-12-05 19:03:59 -0500 | [diff] [blame] | 369 | EXPORT_SYMBOL_GPL(find_module); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | |
| 371 | #ifdef CONFIG_SMP |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 372 | |
Tejun Heo | e74e396 | 2009-03-30 19:07:44 +0900 | [diff] [blame] | 373 | #ifndef CONFIG_HAVE_LEGACY_PER_CPU_AREA |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 374 | |
| 375 | static void *percpu_modalloc(unsigned long size, unsigned long align, |
| 376 | const char *name) |
| 377 | { |
| 378 | void *ptr; |
| 379 | |
| 380 | if (align > PAGE_SIZE) { |
| 381 | printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n", |
| 382 | name, align, PAGE_SIZE); |
| 383 | align = PAGE_SIZE; |
| 384 | } |
| 385 | |
Tejun Heo | edcb463 | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 386 | ptr = __alloc_reserved_percpu(size, align); |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 387 | if (!ptr) |
| 388 | printk(KERN_WARNING |
| 389 | "Could not allocate %lu bytes percpu data\n", size); |
| 390 | return ptr; |
| 391 | } |
| 392 | |
| 393 | static void percpu_modfree(void *freeme) |
| 394 | { |
| 395 | free_percpu(freeme); |
| 396 | } |
| 397 | |
Tejun Heo | e74e396 | 2009-03-30 19:07:44 +0900 | [diff] [blame] | 398 | #else /* ... CONFIG_HAVE_LEGACY_PER_CPU_AREA */ |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 399 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | /* Number of blocks used and allocated. */ |
| 401 | static unsigned int pcpu_num_used, pcpu_num_allocated; |
| 402 | /* Size of each block. -ve means used. */ |
| 403 | static int *pcpu_size; |
| 404 | |
| 405 | static int split_block(unsigned int i, unsigned short size) |
| 406 | { |
| 407 | /* Reallocation required? */ |
| 408 | if (pcpu_num_used + 1 > pcpu_num_allocated) { |
Pekka Enberg | 6d4f9c5 | 2007-05-08 00:24:58 -0700 | [diff] [blame] | 409 | int *new; |
| 410 | |
| 411 | new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2, |
| 412 | GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | if (!new) |
| 414 | return 0; |
| 415 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | pcpu_num_allocated *= 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | pcpu_size = new; |
| 418 | } |
| 419 | |
| 420 | /* Insert a new subblock */ |
| 421 | memmove(&pcpu_size[i+1], &pcpu_size[i], |
| 422 | sizeof(pcpu_size[0]) * (pcpu_num_used - i)); |
| 423 | pcpu_num_used++; |
| 424 | |
| 425 | pcpu_size[i+1] -= size; |
| 426 | pcpu_size[i] = size; |
| 427 | return 1; |
| 428 | } |
| 429 | |
| 430 | static inline unsigned int block_size(int val) |
| 431 | { |
| 432 | if (val < 0) |
| 433 | return -val; |
| 434 | return val; |
| 435 | } |
| 436 | |
Rusty Russell | 842bbaa | 2005-08-01 21:11:47 -0700 | [diff] [blame] | 437 | static void *percpu_modalloc(unsigned long size, unsigned long align, |
| 438 | const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | { |
| 440 | unsigned long extra; |
| 441 | unsigned int i; |
| 442 | void *ptr; |
Catalin Marinas | 4f2294b | 2009-06-11 13:23:20 +0100 | [diff] [blame] | 443 | int cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | |
Jeremy Fitzhardinge | b6e3590 | 2007-05-02 19:27:12 +0200 | [diff] [blame] | 445 | if (align > PAGE_SIZE) { |
| 446 | printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n", |
| 447 | name, align, PAGE_SIZE); |
| 448 | align = PAGE_SIZE; |
Rusty Russell | 842bbaa | 2005-08-01 21:11:47 -0700 | [diff] [blame] | 449 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | |
| 451 | ptr = __per_cpu_start; |
| 452 | for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { |
| 453 | /* Extra for alignment requirement. */ |
| 454 | extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr; |
| 455 | BUG_ON(i == 0 && extra != 0); |
| 456 | |
| 457 | if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size) |
| 458 | continue; |
| 459 | |
| 460 | /* Transfer extra to previous block. */ |
| 461 | if (pcpu_size[i-1] < 0) |
| 462 | pcpu_size[i-1] -= extra; |
| 463 | else |
| 464 | pcpu_size[i-1] += extra; |
| 465 | pcpu_size[i] -= extra; |
| 466 | ptr += extra; |
| 467 | |
| 468 | /* Split block if warranted */ |
| 469 | if (pcpu_size[i] - size > sizeof(unsigned long)) |
| 470 | if (!split_block(i, size)) |
| 471 | return NULL; |
| 472 | |
Catalin Marinas | 4f2294b | 2009-06-11 13:23:20 +0100 | [diff] [blame] | 473 | /* add the per-cpu scanning areas */ |
| 474 | for_each_possible_cpu(cpu) |
| 475 | kmemleak_alloc(ptr + per_cpu_offset(cpu), size, 0, |
| 476 | GFP_KERNEL); |
| 477 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | /* Mark allocated */ |
| 479 | pcpu_size[i] = -pcpu_size[i]; |
| 480 | return ptr; |
| 481 | } |
| 482 | |
| 483 | printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n", |
| 484 | size); |
| 485 | return NULL; |
| 486 | } |
| 487 | |
| 488 | static void percpu_modfree(void *freeme) |
| 489 | { |
| 490 | unsigned int i; |
| 491 | void *ptr = __per_cpu_start + block_size(pcpu_size[0]); |
Catalin Marinas | 4f2294b | 2009-06-11 13:23:20 +0100 | [diff] [blame] | 492 | int cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | |
| 494 | /* First entry is core kernel percpu data. */ |
| 495 | for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { |
| 496 | if (ptr == freeme) { |
| 497 | pcpu_size[i] = -pcpu_size[i]; |
| 498 | goto free; |
| 499 | } |
| 500 | } |
| 501 | BUG(); |
| 502 | |
| 503 | free: |
Catalin Marinas | 4f2294b | 2009-06-11 13:23:20 +0100 | [diff] [blame] | 504 | /* remove the per-cpu scanning areas */ |
| 505 | for_each_possible_cpu(cpu) |
| 506 | kmemleak_free(freeme + per_cpu_offset(cpu)); |
| 507 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | /* Merge with previous? */ |
| 509 | if (pcpu_size[i-1] >= 0) { |
| 510 | pcpu_size[i-1] += pcpu_size[i]; |
| 511 | pcpu_num_used--; |
| 512 | memmove(&pcpu_size[i], &pcpu_size[i+1], |
| 513 | (pcpu_num_used - i) * sizeof(pcpu_size[0])); |
| 514 | i--; |
| 515 | } |
| 516 | /* Merge with next? */ |
| 517 | if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) { |
| 518 | pcpu_size[i] += pcpu_size[i+1]; |
| 519 | pcpu_num_used--; |
| 520 | memmove(&pcpu_size[i+1], &pcpu_size[i+2], |
| 521 | (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0])); |
| 522 | } |
| 523 | } |
| 524 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | static int percpu_modinit(void) |
| 526 | { |
| 527 | pcpu_num_used = 2; |
| 528 | pcpu_num_allocated = 2; |
| 529 | pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated, |
| 530 | GFP_KERNEL); |
| 531 | /* Static in-kernel percpu data (used). */ |
Jeremy Fitzhardinge | b00742d3 | 2007-05-02 19:27:11 +0200 | [diff] [blame] | 532 | pcpu_size[0] = -(__per_cpu_end-__per_cpu_start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | /* Free room. */ |
| 534 | pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0]; |
| 535 | if (pcpu_size[1] < 0) { |
| 536 | printk(KERN_ERR "No per-cpu room for modules.\n"); |
| 537 | pcpu_num_used = 1; |
| 538 | } |
| 539 | |
| 540 | return 0; |
Daniel Walker | 22a8bde | 2007-10-18 03:06:07 -0700 | [diff] [blame] | 541 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | __initcall(percpu_modinit); |
Tejun Heo | 6b588c1 | 2009-02-20 16:29:07 +0900 | [diff] [blame] | 543 | |
Tejun Heo | e74e396 | 2009-03-30 19:07:44 +0900 | [diff] [blame] | 544 | #endif /* CONFIG_HAVE_LEGACY_PER_CPU_AREA */ |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 545 | |
Tejun Heo | 6b588c1 | 2009-02-20 16:29:07 +0900 | [diff] [blame] | 546 | static unsigned int find_pcpusec(Elf_Ehdr *hdr, |
| 547 | Elf_Shdr *sechdrs, |
| 548 | const char *secstrings) |
| 549 | { |
| 550 | return find_sec(hdr, sechdrs, secstrings, ".data.percpu"); |
| 551 | } |
| 552 | |
| 553 | static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size) |
| 554 | { |
| 555 | int cpu; |
| 556 | |
| 557 | for_each_possible_cpu(cpu) |
| 558 | memcpy(pcpudest + per_cpu_offset(cpu), from, size); |
| 559 | } |
| 560 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | #else /* ... !CONFIG_SMP */ |
Tejun Heo | 6b588c1 | 2009-02-20 16:29:07 +0900 | [diff] [blame] | 562 | |
Rusty Russell | 842bbaa | 2005-08-01 21:11:47 -0700 | [diff] [blame] | 563 | static inline void *percpu_modalloc(unsigned long size, unsigned long align, |
| 564 | const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | { |
| 566 | return NULL; |
| 567 | } |
| 568 | static inline void percpu_modfree(void *pcpuptr) |
| 569 | { |
| 570 | BUG(); |
| 571 | } |
| 572 | static inline unsigned int find_pcpusec(Elf_Ehdr *hdr, |
| 573 | Elf_Shdr *sechdrs, |
| 574 | const char *secstrings) |
| 575 | { |
| 576 | return 0; |
| 577 | } |
| 578 | static inline void percpu_modcopy(void *pcpudst, const void *src, |
| 579 | unsigned long size) |
| 580 | { |
| 581 | /* pcpusec should be 0, and size of that section should be 0. */ |
| 582 | BUG_ON(size != 0); |
| 583 | } |
Tejun Heo | 6b588c1 | 2009-02-20 16:29:07 +0900 | [diff] [blame] | 584 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | #endif /* CONFIG_SMP */ |
| 586 | |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 587 | #define MODINFO_ATTR(field) \ |
| 588 | static void setup_modinfo_##field(struct module *mod, const char *s) \ |
| 589 | { \ |
| 590 | mod->field = kstrdup(s, GFP_KERNEL); \ |
| 591 | } \ |
| 592 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ |
| 593 | struct module *mod, char *buffer) \ |
| 594 | { \ |
| 595 | return sprintf(buffer, "%s\n", mod->field); \ |
| 596 | } \ |
| 597 | static int modinfo_##field##_exists(struct module *mod) \ |
| 598 | { \ |
| 599 | return mod->field != NULL; \ |
| 600 | } \ |
| 601 | static void free_modinfo_##field(struct module *mod) \ |
| 602 | { \ |
Daniel Walker | 22a8bde | 2007-10-18 03:06:07 -0700 | [diff] [blame] | 603 | kfree(mod->field); \ |
| 604 | mod->field = NULL; \ |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 605 | } \ |
| 606 | static struct module_attribute modinfo_##field = { \ |
Tejun Heo | 7b59575 | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 607 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 608 | .show = show_modinfo_##field, \ |
| 609 | .setup = setup_modinfo_##field, \ |
| 610 | .test = modinfo_##field##_exists, \ |
| 611 | .free = free_modinfo_##field, \ |
| 612 | }; |
| 613 | |
| 614 | MODINFO_ATTR(version); |
| 615 | MODINFO_ATTR(srcversion); |
| 616 | |
Arjan van de Ven | e14af7e | 2008-01-25 21:08:33 +0100 | [diff] [blame] | 617 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
| 618 | |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 619 | #ifdef CONFIG_MODULE_UNLOAD |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | /* Init the unload section of the module. */ |
| 621 | static void module_unload_init(struct module *mod) |
| 622 | { |
Eric Dumazet | 720eba3 | 2009-02-03 13:31:36 +1030 | [diff] [blame] | 623 | int cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | |
| 625 | INIT_LIST_HEAD(&mod->modules_which_use_me); |
Eric Dumazet | 720eba3 | 2009-02-03 13:31:36 +1030 | [diff] [blame] | 626 | for_each_possible_cpu(cpu) |
| 627 | local_set(__module_ref_addr(mod, cpu), 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | /* Hold reference count during initialization. */ |
Eric Dumazet | 720eba3 | 2009-02-03 13:31:36 +1030 | [diff] [blame] | 629 | local_set(__module_ref_addr(mod, raw_smp_processor_id()), 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | /* Backwards compatibility macros put refcount during init. */ |
| 631 | mod->waiter = current; |
| 632 | } |
| 633 | |
| 634 | /* modules using other modules */ |
| 635 | struct module_use |
| 636 | { |
| 637 | struct list_head list; |
| 638 | struct module *module_which_uses; |
| 639 | }; |
| 640 | |
| 641 | /* Does a already use b? */ |
| 642 | static int already_uses(struct module *a, struct module *b) |
| 643 | { |
| 644 | struct module_use *use; |
| 645 | |
| 646 | list_for_each_entry(use, &b->modules_which_use_me, list) { |
| 647 | if (use->module_which_uses == a) { |
| 648 | DEBUGP("%s uses %s!\n", a->name, b->name); |
| 649 | return 1; |
| 650 | } |
| 651 | } |
| 652 | DEBUGP("%s does not use %s!\n", a->name, b->name); |
| 653 | return 0; |
| 654 | } |
| 655 | |
| 656 | /* Module a uses b */ |
Tim Abbott | c6b3780 | 2008-12-05 19:03:59 -0500 | [diff] [blame] | 657 | int use_module(struct module *a, struct module *b) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | { |
| 659 | struct module_use *use; |
Rusty Russell | c9a3ba5 | 2008-01-29 17:13:18 -0500 | [diff] [blame] | 660 | int no_warn, err; |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 661 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | if (b == NULL || already_uses(a, b)) return 1; |
| 663 | |
Rusty Russell | c9a3ba5 | 2008-01-29 17:13:18 -0500 | [diff] [blame] | 664 | /* If we're interrupted or time out, we fail. */ |
| 665 | if (wait_event_interruptible_timeout( |
| 666 | module_wq, (err = strong_try_module_get(b)) != -EBUSY, |
| 667 | 30 * HZ) <= 0) { |
| 668 | printk("%s: gave up waiting for init of module %s.\n", |
| 669 | a->name, b->name); |
| 670 | return 0; |
| 671 | } |
| 672 | |
| 673 | /* If strong_try_module_get() returned a different error, we fail. */ |
| 674 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | return 0; |
| 676 | |
| 677 | DEBUGP("Allocating new usage for %s.\n", a->name); |
| 678 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
| 679 | if (!use) { |
| 680 | printk("%s: out of memory loading\n", a->name); |
| 681 | module_put(b); |
| 682 | return 0; |
| 683 | } |
| 684 | |
| 685 | use->module_which_uses = a; |
| 686 | list_add(&use->list, &b->modules_which_use_me); |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 687 | no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | return 1; |
| 689 | } |
Tim Abbott | c6b3780 | 2008-12-05 19:03:59 -0500 | [diff] [blame] | 690 | EXPORT_SYMBOL_GPL(use_module); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | |
| 692 | /* Clear the unload stuff of the module. */ |
| 693 | static void module_unload_free(struct module *mod) |
| 694 | { |
| 695 | struct module *i; |
| 696 | |
| 697 | list_for_each_entry(i, &modules, list) { |
| 698 | struct module_use *use; |
| 699 | |
| 700 | list_for_each_entry(use, &i->modules_which_use_me, list) { |
| 701 | if (use->module_which_uses == mod) { |
| 702 | DEBUGP("%s unusing %s\n", mod->name, i->name); |
| 703 | module_put(i); |
| 704 | list_del(&use->list); |
| 705 | kfree(use); |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 706 | sysfs_remove_link(i->holders_dir, mod->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | /* There can be at most one match. */ |
| 708 | break; |
| 709 | } |
| 710 | } |
| 711 | } |
| 712 | } |
| 713 | |
| 714 | #ifdef CONFIG_MODULE_FORCE_UNLOAD |
Akinobu Mita | fb16979 | 2006-01-08 01:04:29 -0800 | [diff] [blame] | 715 | static inline int try_force_unload(unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | { |
| 717 | int ret = (flags & O_TRUNC); |
| 718 | if (ret) |
Akinobu Mita | fb16979 | 2006-01-08 01:04:29 -0800 | [diff] [blame] | 719 | add_taint(TAINT_FORCED_RMMOD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | return ret; |
| 721 | } |
| 722 | #else |
Akinobu Mita | fb16979 | 2006-01-08 01:04:29 -0800 | [diff] [blame] | 723 | static inline int try_force_unload(unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | { |
| 725 | return 0; |
| 726 | } |
| 727 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ |
| 728 | |
| 729 | struct stopref |
| 730 | { |
| 731 | struct module *mod; |
| 732 | int flags; |
| 733 | int *forced; |
| 734 | }; |
| 735 | |
| 736 | /* Whole machine is stopped with interrupts off when this runs. */ |
| 737 | static int __try_stop_module(void *_sref) |
| 738 | { |
| 739 | struct stopref *sref = _sref; |
| 740 | |
Rusty Russell | da39ba5 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 741 | /* If it's not unused, quit unless we're forcing. */ |
| 742 | if (module_refcount(sref->mod) != 0) { |
Akinobu Mita | fb16979 | 2006-01-08 01:04:29 -0800 | [diff] [blame] | 743 | if (!(*sref->forced = try_force_unload(sref->flags))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | return -EWOULDBLOCK; |
| 745 | } |
| 746 | |
| 747 | /* Mark it as dying. */ |
| 748 | sref->mod->state = MODULE_STATE_GOING; |
| 749 | return 0; |
| 750 | } |
| 751 | |
| 752 | static int try_stop_module(struct module *mod, int flags, int *forced) |
| 753 | { |
Rusty Russell | da39ba5 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 754 | if (flags & O_NONBLOCK) { |
| 755 | struct stopref sref = { mod, flags, forced }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | |
Rusty Russell | 9b1a4d3 | 2008-07-28 12:16:30 -0500 | [diff] [blame] | 757 | return stop_machine(__try_stop_module, &sref, NULL); |
Rusty Russell | da39ba5 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 758 | } else { |
| 759 | /* We don't need to stop the machine for this. */ |
| 760 | mod->state = MODULE_STATE_GOING; |
| 761 | synchronize_sched(); |
| 762 | return 0; |
| 763 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | } |
| 765 | |
| 766 | unsigned int module_refcount(struct module *mod) |
| 767 | { |
Eric Dumazet | 720eba3 | 2009-02-03 13:31:36 +1030 | [diff] [blame] | 768 | unsigned int total = 0; |
| 769 | int cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | |
Eric Dumazet | 720eba3 | 2009-02-03 13:31:36 +1030 | [diff] [blame] | 771 | for_each_possible_cpu(cpu) |
| 772 | total += local_read(__module_ref_addr(mod, cpu)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | return total; |
| 774 | } |
| 775 | EXPORT_SYMBOL(module_refcount); |
| 776 | |
| 777 | /* This exists whether we can unload or not */ |
| 778 | static void free_module(struct module *mod); |
| 779 | |
| 780 | static void wait_for_zero_refcount(struct module *mod) |
| 781 | { |
Matthew Wilcox | a655020 | 2008-02-26 10:47:18 -0500 | [diff] [blame] | 782 | /* Since we might sleep for some time, release the mutex first */ |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 783 | mutex_unlock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | for (;;) { |
| 785 | DEBUGP("Looking at refcount...\n"); |
| 786 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 787 | if (module_refcount(mod) == 0) |
| 788 | break; |
| 789 | schedule(); |
| 790 | } |
| 791 | current->state = TASK_RUNNING; |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 792 | mutex_lock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | } |
| 794 | |
Heiko Carstens | 17da2bd | 2009-01-14 14:14:10 +0100 | [diff] [blame] | 795 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
| 796 | unsigned int, flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | { |
| 798 | struct module *mod; |
Greg Kroah-Hartman | dfff0a0 | 2007-02-23 14:54:57 -0800 | [diff] [blame] | 799 | char name[MODULE_NAME_LEN]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | int ret, forced = 0; |
| 801 | |
Kees Cook | 3d43321 | 2009-04-02 15:49:29 -0700 | [diff] [blame] | 802 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
Greg Kroah-Hartman | dfff0a0 | 2007-02-23 14:54:57 -0800 | [diff] [blame] | 803 | return -EPERM; |
| 804 | |
| 805 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) |
| 806 | return -EFAULT; |
| 807 | name[MODULE_NAME_LEN-1] = '\0'; |
| 808 | |
Heiko Carstens | 9e01892 | 2008-12-22 12:36:31 +0100 | [diff] [blame] | 809 | /* Create stop_machine threads since free_module relies on |
| 810 | * a non-failing stop_machine call. */ |
| 811 | ret = stop_machine_create(); |
| 812 | if (ret) |
| 813 | return ret; |
| 814 | |
| 815 | if (mutex_lock_interruptible(&module_mutex) != 0) { |
| 816 | ret = -EINTR; |
| 817 | goto out_stop; |
| 818 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | |
| 820 | mod = find_module(name); |
| 821 | if (!mod) { |
| 822 | ret = -ENOENT; |
| 823 | goto out; |
| 824 | } |
| 825 | |
| 826 | if (!list_empty(&mod->modules_which_use_me)) { |
| 827 | /* Other modules depend on us: get rid of them first. */ |
| 828 | ret = -EWOULDBLOCK; |
| 829 | goto out; |
| 830 | } |
| 831 | |
| 832 | /* Doing init or already dying? */ |
| 833 | if (mod->state != MODULE_STATE_LIVE) { |
| 834 | /* FIXME: if (force), slam module count and wake up |
| 835 | waiter --RR */ |
| 836 | DEBUGP("%s already dying\n", mod->name); |
| 837 | ret = -EBUSY; |
| 838 | goto out; |
| 839 | } |
| 840 | |
| 841 | /* If it has an init func, it must have an exit func to unload */ |
Rusty Russell | af49d92 | 2007-10-16 23:26:27 -0700 | [diff] [blame] | 842 | if (mod->init && !mod->exit) { |
Akinobu Mita | fb16979 | 2006-01-08 01:04:29 -0800 | [diff] [blame] | 843 | forced = try_force_unload(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | if (!forced) { |
| 845 | /* This module can't be removed */ |
| 846 | ret = -EBUSY; |
| 847 | goto out; |
| 848 | } |
| 849 | } |
| 850 | |
| 851 | /* Set this up before setting mod->state */ |
| 852 | mod->waiter = current; |
| 853 | |
| 854 | /* Stop the machine so refcounts can't move and disable module. */ |
| 855 | ret = try_stop_module(mod, flags, &forced); |
| 856 | if (ret != 0) |
| 857 | goto out; |
| 858 | |
| 859 | /* Never wait if forced. */ |
| 860 | if (!forced && module_refcount(mod) != 0) |
| 861 | wait_for_zero_refcount(mod); |
| 862 | |
Peter Oberparleiter | df4b565 | 2008-04-21 14:34:31 +0200 | [diff] [blame] | 863 | mutex_unlock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | /* Final destruction now noone is using it. */ |
Peter Oberparleiter | df4b565 | 2008-04-21 14:34:31 +0200 | [diff] [blame] | 865 | if (mod->exit != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | mod->exit(); |
Peter Oberparleiter | df4b565 | 2008-04-21 14:34:31 +0200 | [diff] [blame] | 867 | blocking_notifier_call_chain(&module_notify_list, |
| 868 | MODULE_STATE_GOING, mod); |
Arjan van de Ven | 22a9d64 | 2009-01-07 08:45:46 -0800 | [diff] [blame] | 869 | async_synchronize_full(); |
Peter Oberparleiter | df4b565 | 2008-04-21 14:34:31 +0200 | [diff] [blame] | 870 | mutex_lock(&module_mutex); |
Arjan van de Ven | e14af7e | 2008-01-25 21:08:33 +0100 | [diff] [blame] | 871 | /* Store the name of the last unloaded module for diagnostic purposes */ |
Rusty Russell | efa5345 | 2008-01-29 17:13:20 -0500 | [diff] [blame] | 872 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
Jason Baron | e9d376f | 2009-02-05 11:51:38 -0500 | [diff] [blame] | 873 | ddebug_remove_module(mod->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | free_module(mod); |
| 875 | |
| 876 | out: |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 877 | mutex_unlock(&module_mutex); |
Heiko Carstens | 9e01892 | 2008-12-22 12:36:31 +0100 | [diff] [blame] | 878 | out_stop: |
| 879 | stop_machine_destroy(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | return ret; |
| 881 | } |
| 882 | |
Jianjun Kong | d1e99d7 | 2008-12-08 14:26:29 +0800 | [diff] [blame] | 883 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | { |
| 885 | struct module_use *use; |
| 886 | int printed_something = 0; |
| 887 | |
| 888 | seq_printf(m, " %u ", module_refcount(mod)); |
| 889 | |
| 890 | /* Always include a trailing , so userspace can differentiate |
| 891 | between this and the old multi-field proc format. */ |
| 892 | list_for_each_entry(use, &mod->modules_which_use_me, list) { |
| 893 | printed_something = 1; |
| 894 | seq_printf(m, "%s,", use->module_which_uses->name); |
| 895 | } |
| 896 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | if (mod->init != NULL && mod->exit == NULL) { |
| 898 | printed_something = 1; |
| 899 | seq_printf(m, "[permanent],"); |
| 900 | } |
| 901 | |
| 902 | if (!printed_something) |
| 903 | seq_printf(m, "-"); |
| 904 | } |
| 905 | |
| 906 | void __symbol_put(const char *symbol) |
| 907 | { |
| 908 | struct module *owner; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | |
Rusty Russell | 24da1cb | 2007-07-15 23:41:46 -0700 | [diff] [blame] | 910 | preempt_disable(); |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 911 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | BUG(); |
| 913 | module_put(owner); |
Rusty Russell | 24da1cb | 2007-07-15 23:41:46 -0700 | [diff] [blame] | 914 | preempt_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | } |
| 916 | EXPORT_SYMBOL(__symbol_put); |
| 917 | |
Rusty Russell | 7d1d16e | 2009-08-26 22:02:54 +0930 | [diff] [blame] | 918 | /* Note this assumes addr is a function, which it currently always is. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | void symbol_put_addr(void *addr) |
| 920 | { |
Trent Piepho | 5e37661 | 2006-05-15 09:44:06 -0700 | [diff] [blame] | 921 | struct module *modaddr; |
Rusty Russell | 7d1d16e | 2009-08-26 22:02:54 +0930 | [diff] [blame] | 922 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | |
Rusty Russell | 7d1d16e | 2009-08-26 22:02:54 +0930 | [diff] [blame] | 924 | if (core_kernel_text(a)) |
Trent Piepho | 5e37661 | 2006-05-15 09:44:06 -0700 | [diff] [blame] | 925 | return; |
| 926 | |
Rusty Russell | a6e6abd | 2009-03-31 13:05:31 -0600 | [diff] [blame] | 927 | /* module_text_address is safe here: we're supposed to have reference |
| 928 | * to module from symbol_get, so it can't go away. */ |
Rusty Russell | 7d1d16e | 2009-08-26 22:02:54 +0930 | [diff] [blame] | 929 | modaddr = __module_text_address(a); |
Rusty Russell | a6e6abd | 2009-03-31 13:05:31 -0600 | [diff] [blame] | 930 | BUG_ON(!modaddr); |
Trent Piepho | 5e37661 | 2006-05-15 09:44:06 -0700 | [diff] [blame] | 931 | module_put(modaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | } |
| 933 | EXPORT_SYMBOL_GPL(symbol_put_addr); |
| 934 | |
| 935 | static ssize_t show_refcnt(struct module_attribute *mattr, |
| 936 | struct module *mod, char *buffer) |
| 937 | { |
Alexey Dobriyan | 256e2fd | 2007-08-06 23:47:45 +0400 | [diff] [blame] | 938 | return sprintf(buffer, "%u\n", module_refcount(mod)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | } |
| 940 | |
| 941 | static struct module_attribute refcnt = { |
Tejun Heo | 7b59575 | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 942 | .attr = { .name = "refcnt", .mode = 0444 }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | .show = show_refcnt, |
| 944 | }; |
| 945 | |
Al Viro | f6a5703 | 2006-10-18 01:47:25 -0400 | [diff] [blame] | 946 | void module_put(struct module *module) |
| 947 | { |
| 948 | if (module) { |
| 949 | unsigned int cpu = get_cpu(); |
Eric Dumazet | 720eba3 | 2009-02-03 13:31:36 +1030 | [diff] [blame] | 950 | local_dec(__module_ref_addr(module, cpu)); |
Li Zefan | 7ead8b8 | 2009-08-17 16:56:28 +0800 | [diff] [blame] | 951 | trace_module_put(module, _RET_IP_, |
| 952 | local_read(__module_ref_addr(module, cpu))); |
Al Viro | f6a5703 | 2006-10-18 01:47:25 -0400 | [diff] [blame] | 953 | /* Maybe they're waiting for us to drop reference? */ |
| 954 | if (unlikely(!module_is_live(module))) |
| 955 | wake_up_process(module->waiter); |
| 956 | put_cpu(); |
| 957 | } |
| 958 | } |
| 959 | EXPORT_SYMBOL(module_put); |
| 960 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | #else /* !CONFIG_MODULE_UNLOAD */ |
Jianjun Kong | d1e99d7 | 2008-12-08 14:26:29 +0800 | [diff] [blame] | 962 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | { |
| 964 | /* We don't know the usage count, or what modules are using. */ |
| 965 | seq_printf(m, " - -"); |
| 966 | } |
| 967 | |
| 968 | static inline void module_unload_free(struct module *mod) |
| 969 | { |
| 970 | } |
| 971 | |
Tim Abbott | c6b3780 | 2008-12-05 19:03:59 -0500 | [diff] [blame] | 972 | int use_module(struct module *a, struct module *b) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | { |
Rusty Russell | c9a3ba5 | 2008-01-29 17:13:18 -0500 | [diff] [blame] | 974 | return strong_try_module_get(b) == 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | } |
Tim Abbott | c6b3780 | 2008-12-05 19:03:59 -0500 | [diff] [blame] | 976 | EXPORT_SYMBOL_GPL(use_module); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | |
| 978 | static inline void module_unload_init(struct module *mod) |
| 979 | { |
| 980 | } |
| 981 | #endif /* CONFIG_MODULE_UNLOAD */ |
| 982 | |
Kay Sievers | 1f71740 | 2006-11-24 12:15:25 +0100 | [diff] [blame] | 983 | static ssize_t show_initstate(struct module_attribute *mattr, |
| 984 | struct module *mod, char *buffer) |
| 985 | { |
| 986 | const char *state = "unknown"; |
| 987 | |
| 988 | switch (mod->state) { |
| 989 | case MODULE_STATE_LIVE: |
| 990 | state = "live"; |
| 991 | break; |
| 992 | case MODULE_STATE_COMING: |
| 993 | state = "coming"; |
| 994 | break; |
| 995 | case MODULE_STATE_GOING: |
| 996 | state = "going"; |
| 997 | break; |
| 998 | } |
| 999 | return sprintf(buffer, "%s\n", state); |
| 1000 | } |
| 1001 | |
| 1002 | static struct module_attribute initstate = { |
Tejun Heo | 7b59575 | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 1003 | .attr = { .name = "initstate", .mode = 0444 }, |
Kay Sievers | 1f71740 | 2006-11-24 12:15:25 +0100 | [diff] [blame] | 1004 | .show = show_initstate, |
| 1005 | }; |
| 1006 | |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1007 | static struct module_attribute *modinfo_attrs[] = { |
| 1008 | &modinfo_version, |
| 1009 | &modinfo_srcversion, |
Kay Sievers | 1f71740 | 2006-11-24 12:15:25 +0100 | [diff] [blame] | 1010 | &initstate, |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1011 | #ifdef CONFIG_MODULE_UNLOAD |
| 1012 | &refcnt, |
| 1013 | #endif |
| 1014 | NULL, |
| 1015 | }; |
| 1016 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | static const char vermagic[] = VERMAGIC_STRING; |
| 1018 | |
Rusty Russell | c6e665c | 2009-03-31 13:05:33 -0600 | [diff] [blame] | 1019 | static int try_to_force_load(struct module *mod, const char *reason) |
Linus Torvalds | 826e450 | 2008-05-04 17:04:16 -0700 | [diff] [blame] | 1020 | { |
| 1021 | #ifdef CONFIG_MODULE_FORCE_LOAD |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 1022 | if (!test_taint(TAINT_FORCED_MODULE)) |
Rusty Russell | c6e665c | 2009-03-31 13:05:33 -0600 | [diff] [blame] | 1023 | printk(KERN_WARNING "%s: %s: kernel tainted.\n", |
| 1024 | mod->name, reason); |
Linus Torvalds | 826e450 | 2008-05-04 17:04:16 -0700 | [diff] [blame] | 1025 | add_taint_module(mod, TAINT_FORCED_MODULE); |
| 1026 | return 0; |
| 1027 | #else |
| 1028 | return -ENOEXEC; |
| 1029 | #endif |
| 1030 | } |
| 1031 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | #ifdef CONFIG_MODVERSIONS |
| 1033 | static int check_version(Elf_Shdr *sechdrs, |
| 1034 | unsigned int versindex, |
| 1035 | const char *symname, |
| 1036 | struct module *mod, |
| 1037 | const unsigned long *crc) |
| 1038 | { |
| 1039 | unsigned int i, num_versions; |
| 1040 | struct modversion_info *versions; |
| 1041 | |
| 1042 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ |
| 1043 | if (!crc) |
| 1044 | return 1; |
| 1045 | |
Rusty Russell | a5dd697 | 2008-05-09 16:24:21 +1000 | [diff] [blame] | 1046 | /* No versions at all? modprobe --force does this. */ |
| 1047 | if (versindex == 0) |
| 1048 | return try_to_force_load(mod, symname) == 0; |
| 1049 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | versions = (void *) sechdrs[versindex].sh_addr; |
| 1051 | num_versions = sechdrs[versindex].sh_size |
| 1052 | / sizeof(struct modversion_info); |
| 1053 | |
| 1054 | for (i = 0; i < num_versions; i++) { |
| 1055 | if (strcmp(versions[i].name, symname) != 0) |
| 1056 | continue; |
| 1057 | |
| 1058 | if (versions[i].crc == *crc) |
| 1059 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | DEBUGP("Found checksum %lX vs module %lX\n", |
| 1061 | *crc, versions[i].crc); |
Linus Torvalds | 826e450 | 2008-05-04 17:04:16 -0700 | [diff] [blame] | 1062 | goto bad_version; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | } |
Linus Torvalds | 826e450 | 2008-05-04 17:04:16 -0700 | [diff] [blame] | 1064 | |
Rusty Russell | a5dd697 | 2008-05-09 16:24:21 +1000 | [diff] [blame] | 1065 | printk(KERN_WARNING "%s: no symbol version for %s\n", |
| 1066 | mod->name, symname); |
| 1067 | return 0; |
Linus Torvalds | 826e450 | 2008-05-04 17:04:16 -0700 | [diff] [blame] | 1068 | |
| 1069 | bad_version: |
| 1070 | printk("%s: disagrees about version of symbol %s\n", |
| 1071 | mod->name, symname); |
| 1072 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | } |
| 1074 | |
| 1075 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, |
| 1076 | unsigned int versindex, |
| 1077 | struct module *mod) |
| 1078 | { |
| 1079 | const unsigned long *crc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | |
Mike Frysinger | 6560dc1 | 2009-07-23 23:42:08 +0930 | [diff] [blame] | 1081 | if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL, |
| 1082 | &crc, true, false)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | BUG(); |
Rusty Russell | 8c8ef42 | 2009-03-31 13:05:34 -0600 | [diff] [blame] | 1084 | return check_version(sechdrs, versindex, "module_layout", mod, crc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | } |
| 1086 | |
Rusty Russell | 91e37a7 | 2008-05-09 16:25:28 +1000 | [diff] [blame] | 1087 | /* First part is kernel version, which we ignore if module has crcs. */ |
| 1088 | static inline int same_magic(const char *amagic, const char *bmagic, |
| 1089 | bool has_crcs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | { |
Rusty Russell | 91e37a7 | 2008-05-09 16:25:28 +1000 | [diff] [blame] | 1091 | if (has_crcs) { |
| 1092 | amagic += strcspn(amagic, " "); |
| 1093 | bmagic += strcspn(bmagic, " "); |
| 1094 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | return strcmp(amagic, bmagic) == 0; |
| 1096 | } |
| 1097 | #else |
| 1098 | static inline int check_version(Elf_Shdr *sechdrs, |
| 1099 | unsigned int versindex, |
| 1100 | const char *symname, |
| 1101 | struct module *mod, |
| 1102 | const unsigned long *crc) |
| 1103 | { |
| 1104 | return 1; |
| 1105 | } |
| 1106 | |
| 1107 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, |
| 1108 | unsigned int versindex, |
| 1109 | struct module *mod) |
| 1110 | { |
| 1111 | return 1; |
| 1112 | } |
| 1113 | |
Rusty Russell | 91e37a7 | 2008-05-09 16:25:28 +1000 | [diff] [blame] | 1114 | static inline int same_magic(const char *amagic, const char *bmagic, |
| 1115 | bool has_crcs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | { |
| 1117 | return strcmp(amagic, bmagic) == 0; |
| 1118 | } |
| 1119 | #endif /* CONFIG_MODVERSIONS */ |
| 1120 | |
| 1121 | /* Resolve a symbol for this module. I.e. if we find one, record usage. |
| 1122 | Must be holding module_mutex. */ |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1123 | static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs, |
| 1124 | unsigned int versindex, |
| 1125 | const char *name, |
| 1126 | struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | { |
| 1128 | struct module *owner; |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1129 | const struct kernel_symbol *sym; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | const unsigned long *crc; |
| 1131 | |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1132 | sym = find_symbol(name, &owner, &crc, |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 1133 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1134 | /* use_module can fail due to OOM, |
| 1135 | or module initialization or unloading */ |
| 1136 | if (sym) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | if (!check_version(sechdrs, versindex, name, mod, crc) || |
| 1138 | !use_module(mod, owner)) |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1139 | sym = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | } |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1141 | return sym; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | } |
| 1143 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | /* |
| 1145 | * /sys/module/foo/sections stuff |
| 1146 | * J. Corbet <corbet@lwn.net> |
| 1147 | */ |
Kay Sievers | 120fc3d | 2008-02-21 00:33:20 +0100 | [diff] [blame] | 1148 | #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS) |
Rusty Russell | a58730c | 2008-03-13 09:03:44 +0000 | [diff] [blame] | 1149 | struct module_sect_attr |
| 1150 | { |
| 1151 | struct module_attribute mattr; |
| 1152 | char *name; |
| 1153 | unsigned long address; |
| 1154 | }; |
| 1155 | |
| 1156 | struct module_sect_attrs |
| 1157 | { |
| 1158 | struct attribute_group grp; |
| 1159 | unsigned int nsections; |
| 1160 | struct module_sect_attr attrs[0]; |
| 1161 | }; |
| 1162 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | static ssize_t module_sect_show(struct module_attribute *mattr, |
| 1164 | struct module *mod, char *buf) |
| 1165 | { |
| 1166 | struct module_sect_attr *sattr = |
| 1167 | container_of(mattr, struct module_sect_attr, mattr); |
| 1168 | return sprintf(buf, "0x%lx\n", sattr->address); |
| 1169 | } |
| 1170 | |
Ian S. Nelson | 04b1db9 | 2006-09-29 02:01:31 -0700 | [diff] [blame] | 1171 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
| 1172 | { |
Rusty Russell | a58730c | 2008-03-13 09:03:44 +0000 | [diff] [blame] | 1173 | unsigned int section; |
Ian S. Nelson | 04b1db9 | 2006-09-29 02:01:31 -0700 | [diff] [blame] | 1174 | |
| 1175 | for (section = 0; section < sect_attrs->nsections; section++) |
| 1176 | kfree(sect_attrs->attrs[section].name); |
| 1177 | kfree(sect_attrs); |
| 1178 | } |
| 1179 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | static void add_sect_attrs(struct module *mod, unsigned int nsect, |
| 1181 | char *secstrings, Elf_Shdr *sechdrs) |
| 1182 | { |
| 1183 | unsigned int nloaded = 0, i, size[2]; |
| 1184 | struct module_sect_attrs *sect_attrs; |
| 1185 | struct module_sect_attr *sattr; |
| 1186 | struct attribute **gattr; |
Daniel Walker | 22a8bde | 2007-10-18 03:06:07 -0700 | [diff] [blame] | 1187 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | /* Count loaded sections and allocate structures */ |
| 1189 | for (i = 0; i < nsect; i++) |
| 1190 | if (sechdrs[i].sh_flags & SHF_ALLOC) |
| 1191 | nloaded++; |
| 1192 | size[0] = ALIGN(sizeof(*sect_attrs) |
| 1193 | + nloaded * sizeof(sect_attrs->attrs[0]), |
| 1194 | sizeof(sect_attrs->grp.attrs[0])); |
| 1195 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); |
Ian S. Nelson | 04b1db9 | 2006-09-29 02:01:31 -0700 | [diff] [blame] | 1196 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
| 1197 | if (sect_attrs == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | return; |
| 1199 | |
| 1200 | /* Setup section attributes. */ |
| 1201 | sect_attrs->grp.name = "sections"; |
| 1202 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; |
| 1203 | |
Ian S. Nelson | 04b1db9 | 2006-09-29 02:01:31 -0700 | [diff] [blame] | 1204 | sect_attrs->nsections = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1205 | sattr = §_attrs->attrs[0]; |
| 1206 | gattr = §_attrs->grp.attrs[0]; |
| 1207 | for (i = 0; i < nsect; i++) { |
| 1208 | if (! (sechdrs[i].sh_flags & SHF_ALLOC)) |
| 1209 | continue; |
| 1210 | sattr->address = sechdrs[i].sh_addr; |
Ian S. Nelson | 04b1db9 | 2006-09-29 02:01:31 -0700 | [diff] [blame] | 1211 | sattr->name = kstrdup(secstrings + sechdrs[i].sh_name, |
| 1212 | GFP_KERNEL); |
| 1213 | if (sattr->name == NULL) |
| 1214 | goto out; |
| 1215 | sect_attrs->nsections++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | sattr->mattr.show = module_sect_show; |
| 1217 | sattr->mattr.store = NULL; |
| 1218 | sattr->mattr.attr.name = sattr->name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | sattr->mattr.attr.mode = S_IRUGO; |
| 1220 | *(gattr++) = &(sattr++)->mattr.attr; |
| 1221 | } |
| 1222 | *gattr = NULL; |
| 1223 | |
| 1224 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) |
| 1225 | goto out; |
| 1226 | |
| 1227 | mod->sect_attrs = sect_attrs; |
| 1228 | return; |
| 1229 | out: |
Ian S. Nelson | 04b1db9 | 2006-09-29 02:01:31 -0700 | [diff] [blame] | 1230 | free_sect_attrs(sect_attrs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | } |
| 1232 | |
| 1233 | static void remove_sect_attrs(struct module *mod) |
| 1234 | { |
| 1235 | if (mod->sect_attrs) { |
| 1236 | sysfs_remove_group(&mod->mkobj.kobj, |
| 1237 | &mod->sect_attrs->grp); |
| 1238 | /* We are positive that no one is using any sect attrs |
| 1239 | * at this point. Deallocate immediately. */ |
Ian S. Nelson | 04b1db9 | 2006-09-29 02:01:31 -0700 | [diff] [blame] | 1240 | free_sect_attrs(mod->sect_attrs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | mod->sect_attrs = NULL; |
| 1242 | } |
| 1243 | } |
| 1244 | |
Roland McGrath | 6d76013 | 2007-10-16 23:26:40 -0700 | [diff] [blame] | 1245 | /* |
| 1246 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. |
| 1247 | */ |
| 1248 | |
| 1249 | struct module_notes_attrs { |
| 1250 | struct kobject *dir; |
| 1251 | unsigned int notes; |
| 1252 | struct bin_attribute attrs[0]; |
| 1253 | }; |
| 1254 | |
| 1255 | static ssize_t module_notes_read(struct kobject *kobj, |
| 1256 | struct bin_attribute *bin_attr, |
| 1257 | char *buf, loff_t pos, size_t count) |
| 1258 | { |
| 1259 | /* |
| 1260 | * The caller checked the pos and count against our size. |
| 1261 | */ |
| 1262 | memcpy(buf, bin_attr->private + pos, count); |
| 1263 | return count; |
| 1264 | } |
| 1265 | |
| 1266 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, |
| 1267 | unsigned int i) |
| 1268 | { |
| 1269 | if (notes_attrs->dir) { |
| 1270 | while (i-- > 0) |
| 1271 | sysfs_remove_bin_file(notes_attrs->dir, |
| 1272 | ¬es_attrs->attrs[i]); |
Alexey Dobriyan | e943209 | 2008-09-23 23:51:11 +0400 | [diff] [blame] | 1273 | kobject_put(notes_attrs->dir); |
Roland McGrath | 6d76013 | 2007-10-16 23:26:40 -0700 | [diff] [blame] | 1274 | } |
| 1275 | kfree(notes_attrs); |
| 1276 | } |
| 1277 | |
| 1278 | static void add_notes_attrs(struct module *mod, unsigned int nsect, |
| 1279 | char *secstrings, Elf_Shdr *sechdrs) |
| 1280 | { |
| 1281 | unsigned int notes, loaded, i; |
| 1282 | struct module_notes_attrs *notes_attrs; |
| 1283 | struct bin_attribute *nattr; |
| 1284 | |
Ingo Molnar | ea6bff3 | 2009-08-28 10:44:56 +0200 | [diff] [blame] | 1285 | /* failed to create section attributes, so can't create notes */ |
| 1286 | if (!mod->sect_attrs) |
| 1287 | return; |
| 1288 | |
Roland McGrath | 6d76013 | 2007-10-16 23:26:40 -0700 | [diff] [blame] | 1289 | /* Count notes sections and allocate structures. */ |
| 1290 | notes = 0; |
| 1291 | for (i = 0; i < nsect; i++) |
| 1292 | if ((sechdrs[i].sh_flags & SHF_ALLOC) && |
| 1293 | (sechdrs[i].sh_type == SHT_NOTE)) |
| 1294 | ++notes; |
| 1295 | |
| 1296 | if (notes == 0) |
| 1297 | return; |
| 1298 | |
| 1299 | notes_attrs = kzalloc(sizeof(*notes_attrs) |
| 1300 | + notes * sizeof(notes_attrs->attrs[0]), |
| 1301 | GFP_KERNEL); |
| 1302 | if (notes_attrs == NULL) |
| 1303 | return; |
| 1304 | |
| 1305 | notes_attrs->notes = notes; |
| 1306 | nattr = ¬es_attrs->attrs[0]; |
| 1307 | for (loaded = i = 0; i < nsect; ++i) { |
| 1308 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) |
| 1309 | continue; |
| 1310 | if (sechdrs[i].sh_type == SHT_NOTE) { |
| 1311 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
| 1312 | nattr->attr.mode = S_IRUGO; |
| 1313 | nattr->size = sechdrs[i].sh_size; |
| 1314 | nattr->private = (void *) sechdrs[i].sh_addr; |
| 1315 | nattr->read = module_notes_read; |
| 1316 | ++nattr; |
| 1317 | } |
| 1318 | ++loaded; |
| 1319 | } |
| 1320 | |
Greg Kroah-Hartman | 4ff6abf | 2007-11-05 22:24:43 -0800 | [diff] [blame] | 1321 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
Roland McGrath | 6d76013 | 2007-10-16 23:26:40 -0700 | [diff] [blame] | 1322 | if (!notes_attrs->dir) |
| 1323 | goto out; |
| 1324 | |
| 1325 | for (i = 0; i < notes; ++i) |
| 1326 | if (sysfs_create_bin_file(notes_attrs->dir, |
| 1327 | ¬es_attrs->attrs[i])) |
| 1328 | goto out; |
| 1329 | |
| 1330 | mod->notes_attrs = notes_attrs; |
| 1331 | return; |
| 1332 | |
| 1333 | out: |
| 1334 | free_notes_attrs(notes_attrs, i); |
| 1335 | } |
| 1336 | |
| 1337 | static void remove_notes_attrs(struct module *mod) |
| 1338 | { |
| 1339 | if (mod->notes_attrs) |
| 1340 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); |
| 1341 | } |
| 1342 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | #else |
Ian S. Nelson | 04b1db9 | 2006-09-29 02:01:31 -0700 | [diff] [blame] | 1344 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | static inline void add_sect_attrs(struct module *mod, unsigned int nsect, |
| 1346 | char *sectstrings, Elf_Shdr *sechdrs) |
| 1347 | { |
| 1348 | } |
| 1349 | |
| 1350 | static inline void remove_sect_attrs(struct module *mod) |
| 1351 | { |
| 1352 | } |
Roland McGrath | 6d76013 | 2007-10-16 23:26:40 -0700 | [diff] [blame] | 1353 | |
| 1354 | static inline void add_notes_attrs(struct module *mod, unsigned int nsect, |
| 1355 | char *sectstrings, Elf_Shdr *sechdrs) |
| 1356 | { |
| 1357 | } |
| 1358 | |
| 1359 | static inline void remove_notes_attrs(struct module *mod) |
| 1360 | { |
| 1361 | } |
Kay Sievers | 120fc3d | 2008-02-21 00:33:20 +0100 | [diff] [blame] | 1362 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | |
Randy Dunlap | ef665c1 | 2007-02-13 15:19:06 -0800 | [diff] [blame] | 1364 | #ifdef CONFIG_SYSFS |
| 1365 | int module_add_modinfo_attrs(struct module *mod) |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1366 | { |
| 1367 | struct module_attribute *attr; |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1368 | struct module_attribute *temp_attr; |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1369 | int error = 0; |
| 1370 | int i; |
| 1371 | |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1372 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
| 1373 | (ARRAY_SIZE(modinfo_attrs) + 1)), |
| 1374 | GFP_KERNEL); |
| 1375 | if (!mod->modinfo_attrs) |
| 1376 | return -ENOMEM; |
| 1377 | |
| 1378 | temp_attr = mod->modinfo_attrs; |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1379 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
| 1380 | if (!attr->test || |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1381 | (attr->test && attr->test(mod))) { |
| 1382 | memcpy(temp_attr, attr, sizeof(*temp_attr)); |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1383 | error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); |
| 1384 | ++temp_attr; |
| 1385 | } |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1386 | } |
| 1387 | return error; |
| 1388 | } |
| 1389 | |
Randy Dunlap | ef665c1 | 2007-02-13 15:19:06 -0800 | [diff] [blame] | 1390 | void module_remove_modinfo_attrs(struct module *mod) |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1391 | { |
| 1392 | struct module_attribute *attr; |
| 1393 | int i; |
| 1394 | |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1395 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
| 1396 | /* pick a field to test for end of list */ |
| 1397 | if (!attr->attr.name) |
| 1398 | break; |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1399 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1400 | if (attr->free) |
| 1401 | attr->free(mod); |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1402 | } |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1403 | kfree(mod->modinfo_attrs); |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1404 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | |
Randy Dunlap | ef665c1 | 2007-02-13 15:19:06 -0800 | [diff] [blame] | 1406 | int mod_sysfs_init(struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1407 | { |
| 1408 | int err; |
Greg Kroah-Hartman | 6494a93 | 2008-01-27 15:38:40 -0800 | [diff] [blame] | 1409 | struct kobject *kobj; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1410 | |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 1411 | if (!module_sysfs_initialized) { |
| 1412 | printk(KERN_ERR "%s: module sysfs not initialized\n", |
Ed Swierk | 1cc5f71 | 2006-09-25 16:25:36 -0700 | [diff] [blame] | 1413 | mod->name); |
| 1414 | err = -EINVAL; |
| 1415 | goto out; |
| 1416 | } |
Greg Kroah-Hartman | 6494a93 | 2008-01-27 15:38:40 -0800 | [diff] [blame] | 1417 | |
| 1418 | kobj = kset_find_obj(module_kset, mod->name); |
| 1419 | if (kobj) { |
| 1420 | printk(KERN_ERR "%s: module is already loaded\n", mod->name); |
| 1421 | kobject_put(kobj); |
| 1422 | err = -EINVAL; |
| 1423 | goto out; |
| 1424 | } |
| 1425 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | mod->mkobj.mod = mod; |
Kay Sievers | e17e0f5 | 2006-11-24 12:15:25 +0100 | [diff] [blame] | 1427 | |
Greg Kroah-Hartman | ac3c814 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 1428 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
| 1429 | mod->mkobj.kobj.kset = module_kset; |
| 1430 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, |
| 1431 | "%s", mod->name); |
| 1432 | if (err) |
| 1433 | kobject_put(&mod->mkobj.kobj); |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 1434 | |
Kay Sievers | 97c146e | 2007-11-29 23:46:11 +0100 | [diff] [blame] | 1435 | /* delay uevent until full sysfs population */ |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 1436 | out: |
| 1437 | return err; |
| 1438 | } |
| 1439 | |
Randy Dunlap | ef665c1 | 2007-02-13 15:19:06 -0800 | [diff] [blame] | 1440 | int mod_sysfs_setup(struct module *mod, |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 1441 | struct kernel_param *kparam, |
| 1442 | unsigned int num_params) |
| 1443 | { |
| 1444 | int err; |
| 1445 | |
Greg Kroah-Hartman | 4ff6abf | 2007-11-05 22:24:43 -0800 | [diff] [blame] | 1446 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
Akinobu Mita | 240936e | 2007-04-26 00:12:09 -0700 | [diff] [blame] | 1447 | if (!mod->holders_dir) { |
| 1448 | err = -ENOMEM; |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 1449 | goto out_unreg; |
Akinobu Mita | 240936e | 2007-04-26 00:12:09 -0700 | [diff] [blame] | 1450 | } |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 1451 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | err = module_param_sysfs_setup(mod, kparam, num_params); |
| 1453 | if (err) |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 1454 | goto out_unreg_holders; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1456 | err = module_add_modinfo_attrs(mod); |
| 1457 | if (err) |
Kay Sievers | e17e0f5 | 2006-11-24 12:15:25 +0100 | [diff] [blame] | 1458 | goto out_unreg_param; |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1459 | |
Kay Sievers | e17e0f5 | 2006-11-24 12:15:25 +0100 | [diff] [blame] | 1460 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | return 0; |
| 1462 | |
Kay Sievers | e17e0f5 | 2006-11-24 12:15:25 +0100 | [diff] [blame] | 1463 | out_unreg_param: |
| 1464 | module_param_sysfs_remove(mod); |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 1465 | out_unreg_holders: |
Greg Kroah-Hartman | 78a2d90 | 2007-12-20 08:13:05 -0800 | [diff] [blame] | 1466 | kobject_put(mod->holders_dir); |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 1467 | out_unreg: |
Kay Sievers | e17e0f5 | 2006-11-24 12:15:25 +0100 | [diff] [blame] | 1468 | kobject_put(&mod->mkobj.kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | return err; |
| 1470 | } |
Denis V. Lunev | 34e4e2f | 2008-05-20 13:59:48 +0400 | [diff] [blame] | 1471 | |
| 1472 | static void mod_sysfs_fini(struct module *mod) |
| 1473 | { |
| 1474 | kobject_put(&mod->mkobj.kobj); |
| 1475 | } |
| 1476 | |
| 1477 | #else /* CONFIG_SYSFS */ |
| 1478 | |
| 1479 | static void mod_sysfs_fini(struct module *mod) |
| 1480 | { |
| 1481 | } |
| 1482 | |
| 1483 | #endif /* CONFIG_SYSFS */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | |
| 1485 | static void mod_kobject_remove(struct module *mod) |
| 1486 | { |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1487 | module_remove_modinfo_attrs(mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1488 | module_param_sysfs_remove(mod); |
Greg Kroah-Hartman | 78a2d90 | 2007-12-20 08:13:05 -0800 | [diff] [blame] | 1489 | kobject_put(mod->mkobj.drivers_dir); |
| 1490 | kobject_put(mod->holders_dir); |
Denis V. Lunev | 34e4e2f | 2008-05-20 13:59:48 +0400 | [diff] [blame] | 1491 | mod_sysfs_fini(mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | } |
| 1493 | |
| 1494 | /* |
| 1495 | * unlink the module with the whole machine is stopped with interrupts off |
| 1496 | * - this defends against kallsyms not taking locks |
| 1497 | */ |
| 1498 | static int __unlink_module(void *_mod) |
| 1499 | { |
| 1500 | struct module *mod = _mod; |
| 1501 | list_del(&mod->list); |
| 1502 | return 0; |
| 1503 | } |
| 1504 | |
Robert P. J. Day | 02a3e59 | 2007-05-09 07:26:28 +0200 | [diff] [blame] | 1505 | /* Free a module, remove from lists, etc (must hold module_mutex). */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | static void free_module(struct module *mod) |
| 1507 | { |
Li Zefan | 7ead8b8 | 2009-08-17 16:56:28 +0800 | [diff] [blame] | 1508 | trace_module_free(mod); |
| 1509 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1510 | /* Delete from various lists */ |
Rusty Russell | 9b1a4d3 | 2008-07-28 12:16:30 -0500 | [diff] [blame] | 1511 | stop_machine(__unlink_module, mod, NULL); |
Roland McGrath | 6d76013 | 2007-10-16 23:26:40 -0700 | [diff] [blame] | 1512 | remove_notes_attrs(mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1513 | remove_sect_attrs(mod); |
| 1514 | mod_kobject_remove(mod); |
| 1515 | |
| 1516 | /* Arch-specific cleanup. */ |
| 1517 | module_arch_cleanup(mod); |
| 1518 | |
| 1519 | /* Module unload stuff */ |
| 1520 | module_unload_free(mod); |
| 1521 | |
Rusty Russell | e180a6b | 2009-03-31 13:05:29 -0600 | [diff] [blame] | 1522 | /* Free any allocated parameters. */ |
| 1523 | destroy_params(mod->kp, mod->num_kp); |
| 1524 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | /* This may be NULL, but that's OK */ |
| 1526 | module_free(mod, mod->module_init); |
| 1527 | kfree(mod->args); |
| 1528 | if (mod->percpu) |
| 1529 | percpu_modfree(mod->percpu); |
Eric Dumazet | 720eba3 | 2009-02-03 13:31:36 +1030 | [diff] [blame] | 1530 | #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP) |
| 1531 | if (mod->refptr) |
| 1532 | percpu_modfree(mod->refptr); |
| 1533 | #endif |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 1534 | /* Free lock-classes: */ |
| 1535 | lockdep_free_key_range(mod->module_core, mod->core_size); |
| 1536 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | /* Finally, free the core (containing the module structure) */ |
| 1538 | module_free(mod, mod->module_core); |
Bernd Schmidt | eb8cdec | 2009-09-21 17:03:57 -0700 | [diff] [blame] | 1539 | |
| 1540 | #ifdef CONFIG_MPU |
| 1541 | update_protections(current->mm); |
| 1542 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | } |
| 1544 | |
| 1545 | void *__symbol_get(const char *symbol) |
| 1546 | { |
| 1547 | struct module *owner; |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1548 | const struct kernel_symbol *sym; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | |
Rusty Russell | 24da1cb | 2007-07-15 23:41:46 -0700 | [diff] [blame] | 1550 | preempt_disable(); |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1551 | sym = find_symbol(symbol, &owner, NULL, true, true); |
| 1552 | if (sym && strong_try_module_get(owner)) |
| 1553 | sym = NULL; |
Rusty Russell | 24da1cb | 2007-07-15 23:41:46 -0700 | [diff] [blame] | 1554 | preempt_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1556 | return sym ? (void *)sym->value : NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1557 | } |
| 1558 | EXPORT_SYMBOL_GPL(__symbol_get); |
| 1559 | |
Ashutosh Naik | eea8b54 | 2006-01-08 01:04:25 -0800 | [diff] [blame] | 1560 | /* |
| 1561 | * Ensure that an exported symbol [global namespace] does not already exist |
Robert P. J. Day | 02a3e59 | 2007-05-09 07:26:28 +0200 | [diff] [blame] | 1562 | * in the kernel or in some other module's exported symbol table. |
Ashutosh Naik | eea8b54 | 2006-01-08 01:04:25 -0800 | [diff] [blame] | 1563 | */ |
| 1564 | static int verify_export_symbols(struct module *mod) |
| 1565 | { |
Rusty Russell | b211104 | 2008-05-01 21:15:00 -0500 | [diff] [blame] | 1566 | unsigned int i; |
Ashutosh Naik | eea8b54 | 2006-01-08 01:04:25 -0800 | [diff] [blame] | 1567 | struct module *owner; |
Rusty Russell | b211104 | 2008-05-01 21:15:00 -0500 | [diff] [blame] | 1568 | const struct kernel_symbol *s; |
| 1569 | struct { |
| 1570 | const struct kernel_symbol *sym; |
| 1571 | unsigned int num; |
| 1572 | } arr[] = { |
| 1573 | { mod->syms, mod->num_syms }, |
| 1574 | { mod->gpl_syms, mod->num_gpl_syms }, |
| 1575 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 1576 | #ifdef CONFIG_UNUSED_SYMBOLS |
Rusty Russell | b211104 | 2008-05-01 21:15:00 -0500 | [diff] [blame] | 1577 | { mod->unused_syms, mod->num_unused_syms }, |
| 1578 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 1579 | #endif |
Rusty Russell | b211104 | 2008-05-01 21:15:00 -0500 | [diff] [blame] | 1580 | }; |
Ashutosh Naik | eea8b54 | 2006-01-08 01:04:25 -0800 | [diff] [blame] | 1581 | |
Rusty Russell | b211104 | 2008-05-01 21:15:00 -0500 | [diff] [blame] | 1582 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
| 1583 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1584 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
Rusty Russell | b211104 | 2008-05-01 21:15:00 -0500 | [diff] [blame] | 1585 | printk(KERN_ERR |
| 1586 | "%s: exports duplicate symbol %s" |
| 1587 | " (owned by %s)\n", |
| 1588 | mod->name, s->name, module_name(owner)); |
| 1589 | return -ENOEXEC; |
| 1590 | } |
Ashutosh Naik | eea8b54 | 2006-01-08 01:04:25 -0800 | [diff] [blame] | 1591 | } |
Rusty Russell | b211104 | 2008-05-01 21:15:00 -0500 | [diff] [blame] | 1592 | } |
| 1593 | return 0; |
Ashutosh Naik | eea8b54 | 2006-01-08 01:04:25 -0800 | [diff] [blame] | 1594 | } |
| 1595 | |
Matti Linnanvuori | 9a4b970 | 2007-11-08 08:37:38 -0800 | [diff] [blame] | 1596 | /* Change all symbols so that st_value encodes the pointer directly. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1597 | static int simplify_symbols(Elf_Shdr *sechdrs, |
| 1598 | unsigned int symindex, |
| 1599 | const char *strtab, |
| 1600 | unsigned int versindex, |
| 1601 | unsigned int pcpuindex, |
| 1602 | struct module *mod) |
| 1603 | { |
| 1604 | Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; |
| 1605 | unsigned long secbase; |
| 1606 | unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); |
| 1607 | int ret = 0; |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1608 | const struct kernel_symbol *ksym; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | |
| 1610 | for (i = 1; i < n; i++) { |
| 1611 | switch (sym[i].st_shndx) { |
| 1612 | case SHN_COMMON: |
| 1613 | /* We compiled with -fno-common. These are not |
| 1614 | supposed to happen. */ |
| 1615 | DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name); |
| 1616 | printk("%s: please compile with -fno-common\n", |
| 1617 | mod->name); |
| 1618 | ret = -ENOEXEC; |
| 1619 | break; |
| 1620 | |
| 1621 | case SHN_ABS: |
| 1622 | /* Don't need to do anything */ |
| 1623 | DEBUGP("Absolute symbol: 0x%08lx\n", |
| 1624 | (long)sym[i].st_value); |
| 1625 | break; |
| 1626 | |
| 1627 | case SHN_UNDEF: |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1628 | ksym = resolve_symbol(sechdrs, versindex, |
| 1629 | strtab + sym[i].st_name, mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | /* Ok if resolved. */ |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1631 | if (ksym) { |
| 1632 | sym[i].st_value = ksym->value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1633 | break; |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1634 | } |
| 1635 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | /* Ok if weak. */ |
| 1637 | if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
| 1638 | break; |
| 1639 | |
| 1640 | printk(KERN_WARNING "%s: Unknown symbol %s\n", |
| 1641 | mod->name, strtab + sym[i].st_name); |
| 1642 | ret = -ENOENT; |
| 1643 | break; |
| 1644 | |
| 1645 | default: |
| 1646 | /* Divert to percpu allocation if a percpu var. */ |
| 1647 | if (sym[i].st_shndx == pcpuindex) |
| 1648 | secbase = (unsigned long)mod->percpu; |
| 1649 | else |
| 1650 | secbase = sechdrs[sym[i].st_shndx].sh_addr; |
| 1651 | sym[i].st_value += secbase; |
| 1652 | break; |
| 1653 | } |
| 1654 | } |
| 1655 | |
| 1656 | return ret; |
| 1657 | } |
| 1658 | |
Helge Deller | 088af9a | 2008-12-31 12:31:18 +0100 | [diff] [blame] | 1659 | /* Additional bytes needed by arch in front of individual sections */ |
| 1660 | unsigned int __weak arch_mod_section_prepend(struct module *mod, |
| 1661 | unsigned int section) |
| 1662 | { |
| 1663 | /* default implementation just returns zero */ |
| 1664 | return 0; |
| 1665 | } |
| 1666 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | /* Update size with this section: return offset. */ |
Helge Deller | 088af9a | 2008-12-31 12:31:18 +0100 | [diff] [blame] | 1668 | static long get_offset(struct module *mod, unsigned int *size, |
| 1669 | Elf_Shdr *sechdr, unsigned int section) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1670 | { |
| 1671 | long ret; |
| 1672 | |
Helge Deller | 088af9a | 2008-12-31 12:31:18 +0100 | [diff] [blame] | 1673 | *size += arch_mod_section_prepend(mod, section); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
| 1675 | *size = ret + sechdr->sh_size; |
| 1676 | return ret; |
| 1677 | } |
| 1678 | |
| 1679 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld |
| 1680 | might -- code, read-only data, read-write data, small data. Tally |
| 1681 | sizes, and place the offsets into sh_entsize fields: high bit means it |
| 1682 | belongs in init. */ |
| 1683 | static void layout_sections(struct module *mod, |
| 1684 | const Elf_Ehdr *hdr, |
| 1685 | Elf_Shdr *sechdrs, |
| 1686 | const char *secstrings) |
| 1687 | { |
| 1688 | static unsigned long const masks[][2] = { |
| 1689 | /* NOTE: all executable code must be the first section |
| 1690 | * in this array; otherwise modify the text_size |
| 1691 | * finder in the two loops below */ |
| 1692 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, |
| 1693 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, |
| 1694 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
| 1695 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } |
| 1696 | }; |
| 1697 | unsigned int m, i; |
| 1698 | |
| 1699 | for (i = 0; i < hdr->e_shnum; i++) |
| 1700 | sechdrs[i].sh_entsize = ~0UL; |
| 1701 | |
| 1702 | DEBUGP("Core section allocation order:\n"); |
| 1703 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
| 1704 | for (i = 0; i < hdr->e_shnum; ++i) { |
| 1705 | Elf_Shdr *s = &sechdrs[i]; |
| 1706 | |
| 1707 | if ((s->sh_flags & masks[m][0]) != masks[m][0] |
| 1708 | || (s->sh_flags & masks[m][1]) |
| 1709 | || s->sh_entsize != ~0UL |
Rusty Russell | 4950267 | 2009-03-31 13:05:36 -0600 | [diff] [blame] | 1710 | || strstarts(secstrings + s->sh_name, ".init")) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1711 | continue; |
Helge Deller | 088af9a | 2008-12-31 12:31:18 +0100 | [diff] [blame] | 1712 | s->sh_entsize = get_offset(mod, &mod->core_size, s, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | DEBUGP("\t%s\n", secstrings + s->sh_name); |
| 1714 | } |
| 1715 | if (m == 0) |
| 1716 | mod->core_text_size = mod->core_size; |
| 1717 | } |
| 1718 | |
| 1719 | DEBUGP("Init section allocation order:\n"); |
| 1720 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
| 1721 | for (i = 0; i < hdr->e_shnum; ++i) { |
| 1722 | Elf_Shdr *s = &sechdrs[i]; |
| 1723 | |
| 1724 | if ((s->sh_flags & masks[m][0]) != masks[m][0] |
| 1725 | || (s->sh_flags & masks[m][1]) |
| 1726 | || s->sh_entsize != ~0UL |
Rusty Russell | 4950267 | 2009-03-31 13:05:36 -0600 | [diff] [blame] | 1727 | || !strstarts(secstrings + s->sh_name, ".init")) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1728 | continue; |
Helge Deller | 088af9a | 2008-12-31 12:31:18 +0100 | [diff] [blame] | 1729 | s->sh_entsize = (get_offset(mod, &mod->init_size, s, i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1730 | | INIT_OFFSET_MASK); |
| 1731 | DEBUGP("\t%s\n", secstrings + s->sh_name); |
| 1732 | } |
| 1733 | if (m == 0) |
| 1734 | mod->init_text_size = mod->init_size; |
| 1735 | } |
| 1736 | } |
| 1737 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1738 | static void set_license(struct module *mod, const char *license) |
| 1739 | { |
| 1740 | if (!license) |
| 1741 | license = "unspecified"; |
| 1742 | |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 1743 | if (!license_is_gpl_compatible(license)) { |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 1744 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
Jan Dittmer | 1d4d262 | 2006-10-28 10:38:38 -0700 | [diff] [blame] | 1745 | printk(KERN_WARNING "%s: module license '%s' taints " |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 1746 | "kernel.\n", mod->name, license); |
| 1747 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | } |
| 1749 | } |
| 1750 | |
| 1751 | /* Parse tag=value strings from .modinfo section */ |
| 1752 | static char *next_string(char *string, unsigned long *secsize) |
| 1753 | { |
| 1754 | /* Skip non-zero chars */ |
| 1755 | while (string[0]) { |
| 1756 | string++; |
| 1757 | if ((*secsize)-- <= 1) |
| 1758 | return NULL; |
| 1759 | } |
| 1760 | |
| 1761 | /* Skip any zero padding. */ |
| 1762 | while (!string[0]) { |
| 1763 | string++; |
| 1764 | if ((*secsize)-- <= 1) |
| 1765 | return NULL; |
| 1766 | } |
| 1767 | return string; |
| 1768 | } |
| 1769 | |
| 1770 | static char *get_modinfo(Elf_Shdr *sechdrs, |
| 1771 | unsigned int info, |
| 1772 | const char *tag) |
| 1773 | { |
| 1774 | char *p; |
| 1775 | unsigned int taglen = strlen(tag); |
| 1776 | unsigned long size = sechdrs[info].sh_size; |
| 1777 | |
| 1778 | for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) { |
| 1779 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
| 1780 | return p + taglen + 1; |
| 1781 | } |
| 1782 | return NULL; |
| 1783 | } |
| 1784 | |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1785 | static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs, |
| 1786 | unsigned int infoindex) |
| 1787 | { |
| 1788 | struct module_attribute *attr; |
| 1789 | int i; |
| 1790 | |
| 1791 | for (i = 0; (attr = modinfo_attrs[i]); i++) { |
| 1792 | if (attr->setup) |
| 1793 | attr->setup(mod, |
| 1794 | get_modinfo(sechdrs, |
| 1795 | infoindex, |
| 1796 | attr->attr.name)); |
| 1797 | } |
| 1798 | } |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1799 | |
Rusty Russell | a263f77 | 2009-09-25 00:32:58 -0600 | [diff] [blame] | 1800 | static void free_modinfo(struct module *mod) |
| 1801 | { |
| 1802 | struct module_attribute *attr; |
| 1803 | int i; |
| 1804 | |
| 1805 | for (i = 0; (attr = modinfo_attrs[i]); i++) { |
| 1806 | if (attr->free) |
| 1807 | attr->free(mod); |
| 1808 | } |
| 1809 | } |
| 1810 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1811 | #ifdef CONFIG_KALLSYMS |
WANG Cong | 15bba37 | 2008-07-24 15:41:48 +0100 | [diff] [blame] | 1812 | |
| 1813 | /* lookup symbol in given range of kernel_symbols */ |
| 1814 | static const struct kernel_symbol *lookup_symbol(const char *name, |
| 1815 | const struct kernel_symbol *start, |
| 1816 | const struct kernel_symbol *stop) |
| 1817 | { |
| 1818 | const struct kernel_symbol *ks = start; |
| 1819 | for (; ks < stop; ks++) |
| 1820 | if (strcmp(ks->name, name) == 0) |
| 1821 | return ks; |
| 1822 | return NULL; |
| 1823 | } |
| 1824 | |
Tim Abbott | ca4787b | 2009-01-05 08:40:10 -0600 | [diff] [blame] | 1825 | static int is_exported(const char *name, unsigned long value, |
| 1826 | const struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1827 | { |
Tim Abbott | ca4787b | 2009-01-05 08:40:10 -0600 | [diff] [blame] | 1828 | const struct kernel_symbol *ks; |
| 1829 | if (!mod) |
| 1830 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); |
Sam Ravnborg | 3fd6805 | 2006-02-08 21:16:45 +0100 | [diff] [blame] | 1831 | else |
Tim Abbott | ca4787b | 2009-01-05 08:40:10 -0600 | [diff] [blame] | 1832 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
| 1833 | return ks != NULL && ks->value == value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1834 | } |
| 1835 | |
| 1836 | /* As per nm */ |
| 1837 | static char elf_type(const Elf_Sym *sym, |
| 1838 | Elf_Shdr *sechdrs, |
| 1839 | const char *secstrings, |
| 1840 | struct module *mod) |
| 1841 | { |
| 1842 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
| 1843 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) |
| 1844 | return 'v'; |
| 1845 | else |
| 1846 | return 'w'; |
| 1847 | } |
| 1848 | if (sym->st_shndx == SHN_UNDEF) |
| 1849 | return 'U'; |
| 1850 | if (sym->st_shndx == SHN_ABS) |
| 1851 | return 'a'; |
| 1852 | if (sym->st_shndx >= SHN_LORESERVE) |
| 1853 | return '?'; |
| 1854 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) |
| 1855 | return 't'; |
| 1856 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC |
| 1857 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { |
| 1858 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) |
| 1859 | return 'r'; |
| 1860 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) |
| 1861 | return 'g'; |
| 1862 | else |
| 1863 | return 'd'; |
| 1864 | } |
| 1865 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { |
| 1866 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) |
| 1867 | return 's'; |
| 1868 | else |
| 1869 | return 'b'; |
| 1870 | } |
Rusty Russell | 4950267 | 2009-03-31 13:05:36 -0600 | [diff] [blame] | 1871 | if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug")) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1872 | return 'n'; |
| 1873 | return '?'; |
| 1874 | } |
| 1875 | |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 1876 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
| 1877 | unsigned int shnum) |
| 1878 | { |
| 1879 | const Elf_Shdr *sec; |
| 1880 | |
| 1881 | if (src->st_shndx == SHN_UNDEF |
| 1882 | || src->st_shndx >= shnum |
| 1883 | || !src->st_name) |
| 1884 | return false; |
| 1885 | |
| 1886 | sec = sechdrs + src->st_shndx; |
| 1887 | if (!(sec->sh_flags & SHF_ALLOC) |
| 1888 | #ifndef CONFIG_KALLSYMS_ALL |
| 1889 | || !(sec->sh_flags & SHF_EXECINSTR) |
| 1890 | #endif |
| 1891 | || (sec->sh_entsize & INIT_OFFSET_MASK)) |
| 1892 | return false; |
| 1893 | |
| 1894 | return true; |
| 1895 | } |
| 1896 | |
| 1897 | static unsigned long layout_symtab(struct module *mod, |
| 1898 | Elf_Shdr *sechdrs, |
| 1899 | unsigned int symindex, |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 1900 | unsigned int strindex, |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 1901 | const Elf_Ehdr *hdr, |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 1902 | const char *secstrings, |
| 1903 | unsigned long *pstroffs, |
| 1904 | unsigned long *strmap) |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 1905 | { |
| 1906 | unsigned long symoffs; |
| 1907 | Elf_Shdr *symsect = sechdrs + symindex; |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 1908 | Elf_Shdr *strsect = sechdrs + strindex; |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 1909 | const Elf_Sym *src; |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 1910 | const char *strtab; |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 1911 | unsigned int i, nsrc, ndst; |
| 1912 | |
| 1913 | /* Put symbol section at end of init part of module. */ |
| 1914 | symsect->sh_flags |= SHF_ALLOC; |
| 1915 | symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect, |
| 1916 | symindex) | INIT_OFFSET_MASK; |
| 1917 | DEBUGP("\t%s\n", secstrings + symsect->sh_name); |
| 1918 | |
| 1919 | src = (void *)hdr + symsect->sh_offset; |
| 1920 | nsrc = symsect->sh_size / sizeof(*src); |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 1921 | strtab = (void *)hdr + strsect->sh_offset; |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 1922 | for (ndst = i = 1; i < nsrc; ++i, ++src) |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 1923 | if (is_core_symbol(src, sechdrs, hdr->e_shnum)) { |
| 1924 | unsigned int j = src->st_name; |
| 1925 | |
| 1926 | while(!__test_and_set_bit(j, strmap) && strtab[j]) |
| 1927 | ++j; |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 1928 | ++ndst; |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 1929 | } |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 1930 | |
| 1931 | /* Append room for core symbols at end of core part. */ |
| 1932 | symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1); |
| 1933 | mod->core_size = symoffs + ndst * sizeof(Elf_Sym); |
| 1934 | |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 1935 | /* Put string table section at end of init part of module. */ |
| 1936 | strsect->sh_flags |= SHF_ALLOC; |
| 1937 | strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect, |
| 1938 | strindex) | INIT_OFFSET_MASK; |
| 1939 | DEBUGP("\t%s\n", secstrings + strsect->sh_name); |
| 1940 | |
| 1941 | /* Append room for core symbols' strings at end of core part. */ |
| 1942 | *pstroffs = mod->core_size; |
| 1943 | __set_bit(0, strmap); |
| 1944 | mod->core_size += bitmap_weight(strmap, strsect->sh_size); |
| 1945 | |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 1946 | return symoffs; |
| 1947 | } |
| 1948 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | static void add_kallsyms(struct module *mod, |
| 1950 | Elf_Shdr *sechdrs, |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 1951 | unsigned int shnum, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1952 | unsigned int symindex, |
| 1953 | unsigned int strindex, |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 1954 | unsigned long symoffs, |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 1955 | unsigned long stroffs, |
| 1956 | const char *secstrings, |
| 1957 | unsigned long *strmap) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1958 | { |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 1959 | unsigned int i, ndst; |
| 1960 | const Elf_Sym *src; |
| 1961 | Elf_Sym *dst; |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 1962 | char *s; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1963 | |
| 1964 | mod->symtab = (void *)sechdrs[symindex].sh_addr; |
| 1965 | mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym); |
| 1966 | mod->strtab = (void *)sechdrs[strindex].sh_addr; |
| 1967 | |
| 1968 | /* Set types up while we still have access to sections. */ |
| 1969 | for (i = 0; i < mod->num_symtab; i++) |
| 1970 | mod->symtab[i].st_info |
| 1971 | = elf_type(&mod->symtab[i], sechdrs, secstrings, mod); |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 1972 | |
| 1973 | mod->core_symtab = dst = mod->module_core + symoffs; |
| 1974 | src = mod->symtab; |
| 1975 | *dst = *src; |
| 1976 | for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) { |
| 1977 | if (!is_core_symbol(src, sechdrs, shnum)) |
| 1978 | continue; |
| 1979 | dst[ndst] = *src; |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 1980 | dst[ndst].st_name = bitmap_weight(strmap, dst[ndst].st_name); |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 1981 | ++ndst; |
| 1982 | } |
| 1983 | mod->core_num_syms = ndst; |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 1984 | |
| 1985 | mod->core_strtab = s = mod->module_core + stroffs; |
| 1986 | for (*s = 0, i = 1; i < sechdrs[strindex].sh_size; ++i) |
| 1987 | if (test_bit(i, strmap)) |
| 1988 | *++s = mod->strtab[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1989 | } |
| 1990 | #else |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 1991 | static inline unsigned long layout_symtab(struct module *mod, |
| 1992 | Elf_Shdr *sechdrs, |
| 1993 | unsigned int symindex, |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 1994 | unsigned int strindex, |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 1995 | const Elf_Hdr *hdr, |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 1996 | const char *secstrings, |
| 1997 | unsigned long *pstroffs, |
| 1998 | unsigned long *strmap) |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 1999 | { |
| 2000 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2001 | static inline void add_kallsyms(struct module *mod, |
| 2002 | Elf_Shdr *sechdrs, |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 2003 | unsigned int shnum, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2004 | unsigned int symindex, |
| 2005 | unsigned int strindex, |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 2006 | unsigned long symoffs, |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 2007 | unsigned long stroffs, |
| 2008 | const char *secstrings, |
| 2009 | const unsigned long *strmap) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2010 | { |
| 2011 | } |
| 2012 | #endif /* CONFIG_KALLSYMS */ |
| 2013 | |
Jason Baron | e9d376f | 2009-02-05 11:51:38 -0500 | [diff] [blame] | 2014 | static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 2015 | { |
Jason Baron | e9d376f | 2009-02-05 11:51:38 -0500 | [diff] [blame] | 2016 | #ifdef CONFIG_DYNAMIC_DEBUG |
| 2017 | if (ddebug_add_module(debug, num, debug->modname)) |
| 2018 | printk(KERN_ERR "dynamic debug error adding module: %s\n", |
| 2019 | debug->modname); |
| 2020 | #endif |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 2021 | } |
Jason Baron | 346e15b | 2008-08-12 16:46:19 -0400 | [diff] [blame] | 2022 | |
Rusty Russell | 3a642e9 | 2008-07-22 19:24:28 -0500 | [diff] [blame] | 2023 | static void *module_alloc_update_bounds(unsigned long size) |
| 2024 | { |
| 2025 | void *ret = module_alloc(size); |
| 2026 | |
| 2027 | if (ret) { |
| 2028 | /* Update module bounds. */ |
| 2029 | if ((unsigned long)ret < module_addr_min) |
| 2030 | module_addr_min = (unsigned long)ret; |
| 2031 | if ((unsigned long)ret + size > module_addr_max) |
| 2032 | module_addr_max = (unsigned long)ret + size; |
| 2033 | } |
| 2034 | return ret; |
| 2035 | } |
| 2036 | |
Catalin Marinas | 4f2294b | 2009-06-11 13:23:20 +0100 | [diff] [blame] | 2037 | #ifdef CONFIG_DEBUG_KMEMLEAK |
| 2038 | static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr, |
| 2039 | Elf_Shdr *sechdrs, char *secstrings) |
| 2040 | { |
| 2041 | unsigned int i; |
| 2042 | |
| 2043 | /* only scan the sections containing data */ |
| 2044 | kmemleak_scan_area(mod->module_core, (unsigned long)mod - |
| 2045 | (unsigned long)mod->module_core, |
| 2046 | sizeof(struct module), GFP_KERNEL); |
| 2047 | |
| 2048 | for (i = 1; i < hdr->e_shnum; i++) { |
| 2049 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) |
| 2050 | continue; |
| 2051 | if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0 |
| 2052 | && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0) |
| 2053 | continue; |
| 2054 | |
| 2055 | kmemleak_scan_area(mod->module_core, sechdrs[i].sh_addr - |
| 2056 | (unsigned long)mod->module_core, |
| 2057 | sechdrs[i].sh_size, GFP_KERNEL); |
| 2058 | } |
| 2059 | } |
| 2060 | #else |
| 2061 | static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr, |
| 2062 | Elf_Shdr *sechdrs, char *secstrings) |
| 2063 | { |
| 2064 | } |
| 2065 | #endif |
| 2066 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2067 | /* Allocate and load the module: note that size of section 0 is always |
| 2068 | zero, and we rely on this for optional sections. */ |
Linus Torvalds | ffb4ba7 | 2008-08-25 11:10:26 -0700 | [diff] [blame] | 2069 | static noinline struct module *load_module(void __user *umod, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2070 | unsigned long len, |
| 2071 | const char __user *uargs) |
| 2072 | { |
| 2073 | Elf_Ehdr *hdr; |
| 2074 | Elf_Shdr *sechdrs; |
| 2075 | char *secstrings, *args, *modmagic, *strtab = NULL; |
Greg Kroah-Hartman | 061b1bd | 2008-09-24 14:46:44 -0700 | [diff] [blame] | 2076 | char *staging; |
Andrew Morton | 84860f9 | 2006-06-28 04:26:46 -0700 | [diff] [blame] | 2077 | unsigned int i; |
| 2078 | unsigned int symindex = 0; |
| 2079 | unsigned int strindex = 0; |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 2080 | unsigned int modindex, versindex, infoindex, pcpuindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2081 | struct module *mod; |
| 2082 | long err = 0; |
| 2083 | void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */ |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 2084 | #ifdef CONFIG_KALLSYMS |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 2085 | unsigned long symoffs, stroffs, *strmap; |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 2086 | #endif |
Thomas Koeller | 378bac8 | 2005-09-06 15:17:11 -0700 | [diff] [blame] | 2087 | mm_segment_t old_fs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2088 | |
| 2089 | DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n", |
| 2090 | umod, len, uargs); |
| 2091 | if (len < sizeof(*hdr)) |
| 2092 | return ERR_PTR(-ENOEXEC); |
| 2093 | |
| 2094 | /* Suck in entire file: we'll want most of it. */ |
| 2095 | /* vmalloc barfs on "unusual" numbers. Check here */ |
| 2096 | if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL) |
| 2097 | return ERR_PTR(-ENOMEM); |
Heiko Carstens | 9e01892 | 2008-12-22 12:36:31 +0100 | [diff] [blame] | 2098 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2099 | if (copy_from_user(hdr, umod, len) != 0) { |
| 2100 | err = -EFAULT; |
| 2101 | goto free_hdr; |
| 2102 | } |
| 2103 | |
| 2104 | /* Sanity checks against insmoding binaries or wrong arch, |
| 2105 | weird elf version */ |
Cyrill Gorcunov | c4ea6fc | 2008-05-14 16:27:29 -0700 | [diff] [blame] | 2106 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2107 | || hdr->e_type != ET_REL |
| 2108 | || !elf_check_arch(hdr) |
| 2109 | || hdr->e_shentsize != sizeof(*sechdrs)) { |
| 2110 | err = -ENOEXEC; |
| 2111 | goto free_hdr; |
| 2112 | } |
| 2113 | |
| 2114 | if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) |
| 2115 | goto truncated; |
| 2116 | |
| 2117 | /* Convenience variables */ |
| 2118 | sechdrs = (void *)hdr + hdr->e_shoff; |
| 2119 | secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; |
| 2120 | sechdrs[0].sh_addr = 0; |
| 2121 | |
| 2122 | for (i = 1; i < hdr->e_shnum; i++) { |
| 2123 | if (sechdrs[i].sh_type != SHT_NOBITS |
| 2124 | && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) |
| 2125 | goto truncated; |
| 2126 | |
| 2127 | /* Mark all sections sh_addr with their address in the |
| 2128 | temporary image. */ |
| 2129 | sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset; |
| 2130 | |
| 2131 | /* Internal symbols and strings. */ |
| 2132 | if (sechdrs[i].sh_type == SHT_SYMTAB) { |
| 2133 | symindex = i; |
| 2134 | strindex = sechdrs[i].sh_link; |
| 2135 | strtab = (char *)hdr + sechdrs[strindex].sh_offset; |
| 2136 | } |
| 2137 | #ifndef CONFIG_MODULE_UNLOAD |
| 2138 | /* Don't load .exit sections */ |
Rusty Russell | 4950267 | 2009-03-31 13:05:36 -0600 | [diff] [blame] | 2139 | if (strstarts(secstrings+sechdrs[i].sh_name, ".exit")) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2140 | sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC; |
| 2141 | #endif |
| 2142 | } |
| 2143 | |
| 2144 | modindex = find_sec(hdr, sechdrs, secstrings, |
| 2145 | ".gnu.linkonce.this_module"); |
| 2146 | if (!modindex) { |
| 2147 | printk(KERN_WARNING "No module found in object\n"); |
| 2148 | err = -ENOEXEC; |
| 2149 | goto free_hdr; |
| 2150 | } |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 2151 | /* This is temporary: point mod into copy of data. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2152 | mod = (void *)sechdrs[modindex].sh_addr; |
| 2153 | |
| 2154 | if (symindex == 0) { |
| 2155 | printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", |
| 2156 | mod->name); |
| 2157 | err = -ENOEXEC; |
| 2158 | goto free_hdr; |
| 2159 | } |
| 2160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2161 | versindex = find_sec(hdr, sechdrs, secstrings, "__versions"); |
| 2162 | infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo"); |
| 2163 | pcpuindex = find_pcpusec(hdr, sechdrs, secstrings); |
| 2164 | |
Rusty Russell | ea01e79 | 2008-03-13 09:02:17 +0000 | [diff] [blame] | 2165 | /* Don't keep modinfo and version sections. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2166 | sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
Rusty Russell | ea01e79 | 2008-03-13 09:02:17 +0000 | [diff] [blame] | 2167 | sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2168 | |
| 2169 | /* Check module struct version now, before we try to use module. */ |
| 2170 | if (!check_modstruct_version(sechdrs, versindex, mod)) { |
| 2171 | err = -ENOEXEC; |
| 2172 | goto free_hdr; |
| 2173 | } |
| 2174 | |
| 2175 | modmagic = get_modinfo(sechdrs, infoindex, "vermagic"); |
| 2176 | /* This is allowed: modprobe --force will invalidate it. */ |
| 2177 | if (!modmagic) { |
Rusty Russell | c6e665c | 2009-03-31 13:05:33 -0600 | [diff] [blame] | 2178 | err = try_to_force_load(mod, "bad vermagic"); |
Linus Torvalds | 826e450 | 2008-05-04 17:04:16 -0700 | [diff] [blame] | 2179 | if (err) |
| 2180 | goto free_hdr; |
Rusty Russell | 91e37a7 | 2008-05-09 16:25:28 +1000 | [diff] [blame] | 2181 | } else if (!same_magic(modmagic, vermagic, versindex)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2182 | printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", |
| 2183 | mod->name, modmagic, vermagic); |
| 2184 | err = -ENOEXEC; |
| 2185 | goto free_hdr; |
| 2186 | } |
| 2187 | |
Greg Kroah-Hartman | 061b1bd | 2008-09-24 14:46:44 -0700 | [diff] [blame] | 2188 | staging = get_modinfo(sechdrs, infoindex, "staging"); |
| 2189 | if (staging) { |
| 2190 | add_taint_module(mod, TAINT_CRAP); |
| 2191 | printk(KERN_WARNING "%s: module is from the staging directory," |
| 2192 | " the quality is unknown, you have been warned.\n", |
| 2193 | mod->name); |
| 2194 | } |
| 2195 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2196 | /* Now copy in args */ |
Davi Arnaut | 24277dd | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 2197 | args = strndup_user(uargs, ~0UL >> 1); |
| 2198 | if (IS_ERR(args)) { |
| 2199 | err = PTR_ERR(args); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2200 | goto free_hdr; |
| 2201 | } |
Andrew Morton | 8e08b75 | 2006-02-07 12:58:45 -0800 | [diff] [blame] | 2202 | |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 2203 | strmap = kzalloc(BITS_TO_LONGS(sechdrs[strindex].sh_size) |
| 2204 | * sizeof(long), GFP_KERNEL); |
| 2205 | if (!strmap) { |
| 2206 | err = -ENOMEM; |
| 2207 | goto free_mod; |
| 2208 | } |
| 2209 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2210 | if (find_module(mod->name)) { |
| 2211 | err = -EEXIST; |
| 2212 | goto free_mod; |
| 2213 | } |
| 2214 | |
| 2215 | mod->state = MODULE_STATE_COMING; |
| 2216 | |
| 2217 | /* Allow arches to frob section contents and sizes. */ |
| 2218 | err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod); |
| 2219 | if (err < 0) |
| 2220 | goto free_mod; |
| 2221 | |
| 2222 | if (pcpuindex) { |
| 2223 | /* We have a special allocation for this section. */ |
| 2224 | percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size, |
Rusty Russell | 842bbaa | 2005-08-01 21:11:47 -0700 | [diff] [blame] | 2225 | sechdrs[pcpuindex].sh_addralign, |
| 2226 | mod->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2227 | if (!percpu) { |
| 2228 | err = -ENOMEM; |
Masami Hiramatsu | 6e2b757 | 2009-03-16 18:13:36 -0400 | [diff] [blame] | 2229 | goto free_mod; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2230 | } |
| 2231 | sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
| 2232 | mod->percpu = percpu; |
| 2233 | } |
| 2234 | |
| 2235 | /* Determine total sizes, and put offsets in sh_entsize. For now |
| 2236 | this is done generically; there doesn't appear to be any |
| 2237 | special cases for the architectures. */ |
| 2238 | layout_sections(mod, hdr, sechdrs, secstrings); |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 2239 | symoffs = layout_symtab(mod, sechdrs, symindex, strindex, hdr, |
| 2240 | secstrings, &stroffs, strmap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2241 | |
| 2242 | /* Do the allocs. */ |
Rusty Russell | 3a642e9 | 2008-07-22 19:24:28 -0500 | [diff] [blame] | 2243 | ptr = module_alloc_update_bounds(mod->core_size); |
Catalin Marinas | 4f2294b | 2009-06-11 13:23:20 +0100 | [diff] [blame] | 2244 | /* |
| 2245 | * The pointer to this block is stored in the module structure |
| 2246 | * which is inside the block. Just mark it as not being a |
| 2247 | * leak. |
| 2248 | */ |
| 2249 | kmemleak_not_leak(ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2250 | if (!ptr) { |
| 2251 | err = -ENOMEM; |
| 2252 | goto free_percpu; |
| 2253 | } |
| 2254 | memset(ptr, 0, mod->core_size); |
| 2255 | mod->module_core = ptr; |
| 2256 | |
Rusty Russell | 3a642e9 | 2008-07-22 19:24:28 -0500 | [diff] [blame] | 2257 | ptr = module_alloc_update_bounds(mod->init_size); |
Catalin Marinas | 4f2294b | 2009-06-11 13:23:20 +0100 | [diff] [blame] | 2258 | /* |
| 2259 | * The pointer to this block is stored in the module structure |
| 2260 | * which is inside the block. This block doesn't need to be |
| 2261 | * scanned as it contains data and code that will be freed |
| 2262 | * after the module is initialized. |
| 2263 | */ |
| 2264 | kmemleak_ignore(ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2265 | if (!ptr && mod->init_size) { |
| 2266 | err = -ENOMEM; |
| 2267 | goto free_core; |
| 2268 | } |
| 2269 | memset(ptr, 0, mod->init_size); |
| 2270 | mod->module_init = ptr; |
| 2271 | |
| 2272 | /* Transfer each section which specifies SHF_ALLOC */ |
| 2273 | DEBUGP("final section addresses:\n"); |
| 2274 | for (i = 0; i < hdr->e_shnum; i++) { |
| 2275 | void *dest; |
| 2276 | |
| 2277 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) |
| 2278 | continue; |
| 2279 | |
| 2280 | if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK) |
| 2281 | dest = mod->module_init |
| 2282 | + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK); |
| 2283 | else |
| 2284 | dest = mod->module_core + sechdrs[i].sh_entsize; |
| 2285 | |
| 2286 | if (sechdrs[i].sh_type != SHT_NOBITS) |
| 2287 | memcpy(dest, (void *)sechdrs[i].sh_addr, |
| 2288 | sechdrs[i].sh_size); |
| 2289 | /* Update sh_addr to point to copy in image. */ |
| 2290 | sechdrs[i].sh_addr = (unsigned long)dest; |
| 2291 | DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name); |
| 2292 | } |
| 2293 | /* Module has been moved. */ |
| 2294 | mod = (void *)sechdrs[modindex].sh_addr; |
Catalin Marinas | 4f2294b | 2009-06-11 13:23:20 +0100 | [diff] [blame] | 2295 | kmemleak_load_module(mod, hdr, sechdrs, secstrings); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2296 | |
Masami Hiramatsu | 6e2b757 | 2009-03-16 18:13:36 -0400 | [diff] [blame] | 2297 | #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP) |
| 2298 | mod->refptr = percpu_modalloc(sizeof(local_t), __alignof__(local_t), |
| 2299 | mod->name); |
| 2300 | if (!mod->refptr) { |
| 2301 | err = -ENOMEM; |
| 2302 | goto free_init; |
| 2303 | } |
| 2304 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2305 | /* Now we've moved module, initialize linked lists, etc. */ |
| 2306 | module_unload_init(mod); |
| 2307 | |
Kay Sievers | 97c146e | 2007-11-29 23:46:11 +0100 | [diff] [blame] | 2308 | /* add kobject, so we can reference it. */ |
Akinobu Mita | d58ae67 | 2007-10-16 23:30:27 -0700 | [diff] [blame] | 2309 | err = mod_sysfs_init(mod); |
| 2310 | if (err) |
Kay Sievers | 97c146e | 2007-11-29 23:46:11 +0100 | [diff] [blame] | 2311 | goto free_unload; |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 2312 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2313 | /* Set up license info based on the info section */ |
| 2314 | set_license(mod, get_modinfo(sechdrs, infoindex, "license")); |
| 2315 | |
Pavel Roskin | 9b37ccf | 2008-02-28 17:11:02 -0500 | [diff] [blame] | 2316 | /* |
| 2317 | * ndiswrapper is under GPL by itself, but loads proprietary modules. |
| 2318 | * Don't use add_taint_module(), as it would prevent ndiswrapper from |
| 2319 | * using GPL-only symbols it needs. |
| 2320 | */ |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 2321 | if (strcmp(mod->name, "ndiswrapper") == 0) |
Pavel Roskin | 9b37ccf | 2008-02-28 17:11:02 -0500 | [diff] [blame] | 2322 | add_taint(TAINT_PROPRIETARY_MODULE); |
| 2323 | |
| 2324 | /* driverloader was caught wrongly pretending to be under GPL */ |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 2325 | if (strcmp(mod->name, "driverloader") == 0) |
| 2326 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); |
Dave Jones | 9841d61 | 2006-01-08 01:03:41 -0800 | [diff] [blame] | 2327 | |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 2328 | /* Set up MODINFO_ATTR fields */ |
| 2329 | setup_modinfo(mod, sechdrs, infoindex); |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 2330 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2331 | /* Fix up syms, so that st_value is a pointer to location. */ |
| 2332 | err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex, |
| 2333 | mod); |
| 2334 | if (err < 0) |
| 2335 | goto cleanup; |
| 2336 | |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 2337 | /* Now we've got everything in the final locations, we can |
| 2338 | * find optional sections. */ |
Rusty Russell | e180a6b | 2009-03-31 13:05:29 -0600 | [diff] [blame] | 2339 | mod->kp = section_objs(hdr, sechdrs, secstrings, "__param", |
| 2340 | sizeof(*mod->kp), &mod->num_kp); |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 2341 | mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab", |
| 2342 | sizeof(*mod->syms), &mod->num_syms); |
| 2343 | mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab"); |
| 2344 | mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl", |
| 2345 | sizeof(*mod->gpl_syms), |
| 2346 | &mod->num_gpl_syms); |
| 2347 | mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl"); |
| 2348 | mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings, |
| 2349 | "__ksymtab_gpl_future", |
| 2350 | sizeof(*mod->gpl_future_syms), |
| 2351 | &mod->num_gpl_future_syms); |
| 2352 | mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings, |
| 2353 | "__kcrctab_gpl_future"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2354 | |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 2355 | #ifdef CONFIG_UNUSED_SYMBOLS |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 2356 | mod->unused_syms = section_objs(hdr, sechdrs, secstrings, |
| 2357 | "__ksymtab_unused", |
| 2358 | sizeof(*mod->unused_syms), |
| 2359 | &mod->num_unused_syms); |
| 2360 | mod->unused_crcs = section_addr(hdr, sechdrs, secstrings, |
| 2361 | "__kcrctab_unused"); |
| 2362 | mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings, |
| 2363 | "__ksymtab_unused_gpl", |
| 2364 | sizeof(*mod->unused_gpl_syms), |
| 2365 | &mod->num_unused_gpl_syms); |
| 2366 | mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings, |
| 2367 | "__kcrctab_unused_gpl"); |
| 2368 | #endif |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 2369 | #ifdef CONFIG_CONSTRUCTORS |
| 2370 | mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors", |
| 2371 | sizeof(*mod->ctors), &mod->num_ctors); |
| 2372 | #endif |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 2373 | |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 2374 | #ifdef CONFIG_TRACEPOINTS |
| 2375 | mod->tracepoints = section_objs(hdr, sechdrs, secstrings, |
| 2376 | "__tracepoints", |
| 2377 | sizeof(*mod->tracepoints), |
| 2378 | &mod->num_tracepoints); |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 2379 | #endif |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 2380 | #ifdef CONFIG_EVENT_TRACING |
| 2381 | mod->trace_events = section_objs(hdr, sechdrs, secstrings, |
| 2382 | "_ftrace_events", |
| 2383 | sizeof(*mod->trace_events), |
| 2384 | &mod->num_trace_events); |
| 2385 | #endif |
Steven Rostedt | 93eb677 | 2009-04-15 13:24:06 -0400 | [diff] [blame] | 2386 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
| 2387 | /* sechdrs[0].sh_size is always zero */ |
| 2388 | mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings, |
| 2389 | "__mcount_loc", |
| 2390 | sizeof(*mod->ftrace_callsites), |
| 2391 | &mod->num_ftrace_callsites); |
| 2392 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2393 | #ifdef CONFIG_MODVERSIONS |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 2394 | if ((mod->num_syms && !mod->crcs) |
| 2395 | || (mod->num_gpl_syms && !mod->gpl_crcs) |
| 2396 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 2397 | #ifdef CONFIG_UNUSED_SYMBOLS |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 2398 | || (mod->num_unused_syms && !mod->unused_crcs) |
| 2399 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 2400 | #endif |
| 2401 | ) { |
Rusty Russell | c6e665c | 2009-03-31 13:05:33 -0600 | [diff] [blame] | 2402 | err = try_to_force_load(mod, |
| 2403 | "no versions for exported symbols"); |
Linus Torvalds | 826e450 | 2008-05-04 17:04:16 -0700 | [diff] [blame] | 2404 | if (err) |
| 2405 | goto cleanup; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2406 | } |
| 2407 | #endif |
| 2408 | |
| 2409 | /* Now do relocations. */ |
| 2410 | for (i = 1; i < hdr->e_shnum; i++) { |
| 2411 | const char *strtab = (char *)sechdrs[strindex].sh_addr; |
| 2412 | unsigned int info = sechdrs[i].sh_info; |
| 2413 | |
| 2414 | /* Not a valid relocation section? */ |
| 2415 | if (info >= hdr->e_shnum) |
| 2416 | continue; |
| 2417 | |
| 2418 | /* Don't bother with non-allocated sections */ |
| 2419 | if (!(sechdrs[info].sh_flags & SHF_ALLOC)) |
| 2420 | continue; |
| 2421 | |
| 2422 | if (sechdrs[i].sh_type == SHT_REL) |
| 2423 | err = apply_relocate(sechdrs, strtab, symindex, i,mod); |
| 2424 | else if (sechdrs[i].sh_type == SHT_RELA) |
| 2425 | err = apply_relocate_add(sechdrs, strtab, symindex, i, |
| 2426 | mod); |
| 2427 | if (err < 0) |
| 2428 | goto cleanup; |
| 2429 | } |
| 2430 | |
Ashutosh Naik | eea8b54 | 2006-01-08 01:04:25 -0800 | [diff] [blame] | 2431 | /* Find duplicate symbols */ |
| 2432 | err = verify_export_symbols(mod); |
Ashutosh Naik | eea8b54 | 2006-01-08 01:04:25 -0800 | [diff] [blame] | 2433 | if (err < 0) |
| 2434 | goto cleanup; |
| 2435 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2436 | /* Set up and sort exception table */ |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 2437 | mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table", |
| 2438 | sizeof(*mod->extable), &mod->num_exentries); |
| 2439 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2440 | |
| 2441 | /* Finally, copy percpu area over. */ |
| 2442 | percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr, |
| 2443 | sechdrs[pcpuindex].sh_size); |
| 2444 | |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 2445 | add_kallsyms(mod, sechdrs, hdr->e_shnum, symindex, strindex, |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 2446 | symoffs, stroffs, secstrings, strmap); |
| 2447 | kfree(strmap); |
| 2448 | strmap = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2449 | |
Mathieu Desnoyers | 97e1c18 | 2008-07-18 12:16:16 -0400 | [diff] [blame] | 2450 | if (!mod->taints) { |
Jason Baron | e9d376f | 2009-02-05 11:51:38 -0500 | [diff] [blame] | 2451 | struct _ddebug *debug; |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 2452 | unsigned int num_debug; |
| 2453 | |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 2454 | debug = section_objs(hdr, sechdrs, secstrings, "__verbose", |
| 2455 | sizeof(*debug), &num_debug); |
Jason Baron | e9d376f | 2009-02-05 11:51:38 -0500 | [diff] [blame] | 2456 | if (debug) |
| 2457 | dynamic_debug_setup(debug, num_debug); |
Mathieu Desnoyers | 97e1c18 | 2008-07-18 12:16:16 -0400 | [diff] [blame] | 2458 | } |
Steven Rostedt | 90d595f | 2008-08-14 15:45:09 -0400 | [diff] [blame] | 2459 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2460 | err = module_finalize(hdr, sechdrs, mod); |
| 2461 | if (err < 0) |
| 2462 | goto cleanup; |
| 2463 | |
Thomas Koeller | 378bac8 | 2005-09-06 15:17:11 -0700 | [diff] [blame] | 2464 | /* flush the icache in correct context */ |
| 2465 | old_fs = get_fs(); |
| 2466 | set_fs(KERNEL_DS); |
| 2467 | |
| 2468 | /* |
| 2469 | * Flush the instruction cache, since we've played with text. |
| 2470 | * Do it before processing of module parameters, so the module |
| 2471 | * can provide parameter accessor functions of its own. |
| 2472 | */ |
| 2473 | if (mod->module_init) |
| 2474 | flush_icache_range((unsigned long)mod->module_init, |
| 2475 | (unsigned long)mod->module_init |
| 2476 | + mod->init_size); |
| 2477 | flush_icache_range((unsigned long)mod->module_core, |
| 2478 | (unsigned long)mod->module_core + mod->core_size); |
| 2479 | |
| 2480 | set_fs(old_fs); |
| 2481 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2482 | mod->args = args; |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 2483 | if (section_addr(hdr, sechdrs, secstrings, "__obsparm")) |
Rusty Russell | 8d3b33f | 2006-03-25 03:07:05 -0800 | [diff] [blame] | 2484 | printk(KERN_WARNING "%s: Ignoring obsolete parameters\n", |
| 2485 | mod->name); |
| 2486 | |
Rusty Russell | bb9d3d5 | 2008-01-29 17:13:21 -0500 | [diff] [blame] | 2487 | /* Now sew it into the lists so we can get lockdep and oops |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 2488 | * info during argument parsing. Noone should access us, since |
| 2489 | * strong_try_module_get() will fail. |
| 2490 | * lockdep/oops can run asynchronous, so use the RCU list insertion |
| 2491 | * function to insert in a way safe to concurrent readers. |
| 2492 | * The mutex protects against concurrent writers. |
| 2493 | */ |
| 2494 | list_add_rcu(&mod->list, &modules); |
Rusty Russell | bb9d3d5 | 2008-01-29 17:13:21 -0500 | [diff] [blame] | 2495 | |
Rusty Russell | e180a6b | 2009-03-31 13:05:29 -0600 | [diff] [blame] | 2496 | err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2497 | if (err < 0) |
Rusty Russell | bb9d3d5 | 2008-01-29 17:13:21 -0500 | [diff] [blame] | 2498 | goto unlink; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2499 | |
Rusty Russell | e180a6b | 2009-03-31 13:05:29 -0600 | [diff] [blame] | 2500 | err = mod_sysfs_setup(mod, mod->kp, mod->num_kp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2501 | if (err < 0) |
Rusty Russell | bb9d3d5 | 2008-01-29 17:13:21 -0500 | [diff] [blame] | 2502 | goto unlink; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2503 | add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
Roland McGrath | 6d76013 | 2007-10-16 23:26:40 -0700 | [diff] [blame] | 2504 | add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2505 | |
| 2506 | /* Get rid of temporary copy */ |
| 2507 | vfree(hdr); |
| 2508 | |
Li Zefan | 7ead8b8 | 2009-08-17 16:56:28 +0800 | [diff] [blame] | 2509 | trace_module_load(mod); |
| 2510 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2511 | /* Done! */ |
| 2512 | return mod; |
| 2513 | |
Rusty Russell | bb9d3d5 | 2008-01-29 17:13:21 -0500 | [diff] [blame] | 2514 | unlink: |
Rusty Russell | e91defa | 2009-03-31 13:05:35 -0600 | [diff] [blame] | 2515 | /* Unlink carefully: kallsyms could be walking list. */ |
| 2516 | list_del_rcu(&mod->list); |
| 2517 | synchronize_sched(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2518 | module_arch_cleanup(mod); |
| 2519 | cleanup: |
Rusty Russell | a263f77 | 2009-09-25 00:32:58 -0600 | [diff] [blame] | 2520 | free_modinfo(mod); |
Kay Sievers | 97c146e | 2007-11-29 23:46:11 +0100 | [diff] [blame] | 2521 | kobject_del(&mod->mkobj.kobj); |
| 2522 | kobject_put(&mod->mkobj.kobj); |
| 2523 | free_unload: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2524 | module_unload_free(mod); |
Eric Dumazet | 720eba3 | 2009-02-03 13:31:36 +1030 | [diff] [blame] | 2525 | #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP) |
| 2526 | percpu_modfree(mod->refptr); |
Rusty Russell | ffa9f12 | 2009-09-25 00:32:59 -0600 | [diff] [blame] | 2527 | free_init: |
Eric Dumazet | 720eba3 | 2009-02-03 13:31:36 +1030 | [diff] [blame] | 2528 | #endif |
Masami Hiramatsu | 6e2b757 | 2009-03-16 18:13:36 -0400 | [diff] [blame] | 2529 | module_free(mod, mod->module_init); |
| 2530 | free_core: |
| 2531 | module_free(mod, mod->module_core); |
| 2532 | /* mod will be freed with core. Don't access it beyond this line! */ |
| 2533 | free_percpu: |
| 2534 | if (percpu) |
| 2535 | percpu_modfree(percpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2536 | free_mod: |
| 2537 | kfree(args); |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 2538 | kfree(strmap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2539 | free_hdr: |
| 2540 | vfree(hdr); |
Jayachandran C | 6fe2e70 | 2006-01-06 00:19:54 -0800 | [diff] [blame] | 2541 | return ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2542 | |
| 2543 | truncated: |
| 2544 | printk(KERN_ERR "Module len %lu truncated\n", len); |
| 2545 | err = -ENOEXEC; |
| 2546 | goto free_hdr; |
| 2547 | } |
| 2548 | |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 2549 | /* Call module constructors. */ |
| 2550 | static void do_mod_ctors(struct module *mod) |
| 2551 | { |
| 2552 | #ifdef CONFIG_CONSTRUCTORS |
| 2553 | unsigned long i; |
| 2554 | |
| 2555 | for (i = 0; i < mod->num_ctors; i++) |
| 2556 | mod->ctors[i](); |
| 2557 | #endif |
| 2558 | } |
| 2559 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2560 | /* This is where the real work happens */ |
Heiko Carstens | 17da2bd | 2009-01-14 14:14:10 +0100 | [diff] [blame] | 2561 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
| 2562 | unsigned long, len, const char __user *, uargs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2563 | { |
| 2564 | struct module *mod; |
| 2565 | int ret = 0; |
| 2566 | |
| 2567 | /* Must have permission */ |
Kees Cook | 3d43321 | 2009-04-02 15:49:29 -0700 | [diff] [blame] | 2568 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2569 | return -EPERM; |
| 2570 | |
| 2571 | /* Only one module load at a time, please */ |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 2572 | if (mutex_lock_interruptible(&module_mutex) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2573 | return -EINTR; |
| 2574 | |
| 2575 | /* Do all the hard work */ |
| 2576 | mod = load_module(umod, len, uargs); |
| 2577 | if (IS_ERR(mod)) { |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 2578 | mutex_unlock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2579 | return PTR_ERR(mod); |
| 2580 | } |
| 2581 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2582 | /* Drop lock so they can recurse */ |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 2583 | mutex_unlock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2584 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 2585 | blocking_notifier_call_chain(&module_notify_list, |
| 2586 | MODULE_STATE_COMING, mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2587 | |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 2588 | do_mod_ctors(mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2589 | /* Start the module */ |
| 2590 | if (mod->init != NULL) |
Arjan van de Ven | 59f9415 | 2008-07-30 12:49:02 -0700 | [diff] [blame] | 2591 | ret = do_one_initcall(mod->init); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2592 | if (ret < 0) { |
| 2593 | /* Init routine failed: abort. Try to protect us from |
| 2594 | buggy refcounters. */ |
| 2595 | mod->state = MODULE_STATE_GOING; |
Paul E. McKenney | fbd568a3e | 2005-05-01 08:59:04 -0700 | [diff] [blame] | 2596 | synchronize_sched(); |
Rusty Russell | af49d92 | 2007-10-16 23:26:27 -0700 | [diff] [blame] | 2597 | module_put(mod); |
Peter Oberparleiter | df4b565 | 2008-04-21 14:34:31 +0200 | [diff] [blame] | 2598 | blocking_notifier_call_chain(&module_notify_list, |
| 2599 | MODULE_STATE_GOING, mod); |
Rusty Russell | af49d92 | 2007-10-16 23:26:27 -0700 | [diff] [blame] | 2600 | mutex_lock(&module_mutex); |
| 2601 | free_module(mod); |
| 2602 | mutex_unlock(&module_mutex); |
Rusty Russell | c9a3ba5 | 2008-01-29 17:13:18 -0500 | [diff] [blame] | 2603 | wake_up(&module_wq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2604 | return ret; |
| 2605 | } |
Alexey Dobriyan | e24e2e6 | 2008-03-10 11:43:53 -0700 | [diff] [blame] | 2606 | if (ret > 0) { |
Joe Perches | ad361c9 | 2009-07-06 13:05:40 -0700 | [diff] [blame] | 2607 | printk(KERN_WARNING |
| 2608 | "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n" |
| 2609 | "%s: loading module anyway...\n", |
Alexey Dobriyan | e24e2e6 | 2008-03-10 11:43:53 -0700 | [diff] [blame] | 2610 | __func__, mod->name, ret, |
| 2611 | __func__); |
| 2612 | dump_stack(); |
| 2613 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2614 | |
Rusty Russell | 6c5db22 | 2008-03-10 11:43:52 -0700 | [diff] [blame] | 2615 | /* Now it's a first class citizen! Wake up anyone waiting for it. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2616 | mod->state = MODULE_STATE_LIVE; |
Rusty Russell | 6c5db22 | 2008-03-10 11:43:52 -0700 | [diff] [blame] | 2617 | wake_up(&module_wq); |
Masami Hiramatsu | 0deddf4 | 2009-01-06 14:41:54 -0800 | [diff] [blame] | 2618 | blocking_notifier_call_chain(&module_notify_list, |
| 2619 | MODULE_STATE_LIVE, mod); |
Rusty Russell | 6c5db22 | 2008-03-10 11:43:52 -0700 | [diff] [blame] | 2620 | |
Linus Torvalds | d6de2c8 | 2009-04-10 12:17:41 -0700 | [diff] [blame] | 2621 | /* We need to finish all async code before the module init sequence is done */ |
| 2622 | async_synchronize_full(); |
| 2623 | |
Rusty Russell | 6c5db22 | 2008-03-10 11:43:52 -0700 | [diff] [blame] | 2624 | mutex_lock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2625 | /* Drop initial reference. */ |
| 2626 | module_put(mod); |
Rusty Russell | ad6561d | 2009-06-12 21:47:03 -0600 | [diff] [blame] | 2627 | trim_init_extable(mod); |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 2628 | #ifdef CONFIG_KALLSYMS |
| 2629 | mod->num_symtab = mod->core_num_syms; |
| 2630 | mod->symtab = mod->core_symtab; |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 2631 | mod->strtab = mod->core_strtab; |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 2632 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2633 | module_free(mod, mod->module_init); |
| 2634 | mod->module_init = NULL; |
| 2635 | mod->init_size = 0; |
| 2636 | mod->init_text_size = 0; |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 2637 | mutex_unlock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2638 | |
| 2639 | return 0; |
| 2640 | } |
| 2641 | |
| 2642 | static inline int within(unsigned long addr, void *start, unsigned long size) |
| 2643 | { |
| 2644 | return ((void *)addr >= start && (void *)addr < start + size); |
| 2645 | } |
| 2646 | |
| 2647 | #ifdef CONFIG_KALLSYMS |
| 2648 | /* |
| 2649 | * This ignores the intensely annoying "mapping symbols" found |
| 2650 | * in ARM ELF files: $a, $t and $d. |
| 2651 | */ |
| 2652 | static inline int is_arm_mapping_symbol(const char *str) |
| 2653 | { |
Daniel Walker | 22a8bde | 2007-10-18 03:06:07 -0700 | [diff] [blame] | 2654 | return str[0] == '$' && strchr("atd", str[1]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2655 | && (str[2] == '\0' || str[2] == '.'); |
| 2656 | } |
| 2657 | |
| 2658 | static const char *get_ksymbol(struct module *mod, |
| 2659 | unsigned long addr, |
| 2660 | unsigned long *size, |
| 2661 | unsigned long *offset) |
| 2662 | { |
| 2663 | unsigned int i, best = 0; |
| 2664 | unsigned long nextval; |
| 2665 | |
| 2666 | /* At worse, next value is at end of module */ |
Masami Hiramatsu | a06f621 | 2009-01-06 14:41:49 -0800 | [diff] [blame] | 2667 | if (within_module_init(addr, mod)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2668 | nextval = (unsigned long)mod->module_init+mod->init_text_size; |
Daniel Walker | 22a8bde | 2007-10-18 03:06:07 -0700 | [diff] [blame] | 2669 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2670 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
| 2671 | |
| 2672 | /* Scan for closest preceeding symbol, and next symbol. (ELF |
Daniel Walker | 22a8bde | 2007-10-18 03:06:07 -0700 | [diff] [blame] | 2673 | starts real symbols at 1). */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2674 | for (i = 1; i < mod->num_symtab; i++) { |
| 2675 | if (mod->symtab[i].st_shndx == SHN_UNDEF) |
| 2676 | continue; |
| 2677 | |
| 2678 | /* We ignore unnamed symbols: they're uninformative |
| 2679 | * and inserted at a whim. */ |
| 2680 | if (mod->symtab[i].st_value <= addr |
| 2681 | && mod->symtab[i].st_value > mod->symtab[best].st_value |
| 2682 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' |
| 2683 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) |
| 2684 | best = i; |
| 2685 | if (mod->symtab[i].st_value > addr |
| 2686 | && mod->symtab[i].st_value < nextval |
| 2687 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' |
| 2688 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) |
| 2689 | nextval = mod->symtab[i].st_value; |
| 2690 | } |
| 2691 | |
| 2692 | if (!best) |
| 2693 | return NULL; |
| 2694 | |
Alexey Dobriyan | ffb4512 | 2007-05-08 00:28:41 -0700 | [diff] [blame] | 2695 | if (size) |
| 2696 | *size = nextval - mod->symtab[best].st_value; |
| 2697 | if (offset) |
| 2698 | *offset = addr - mod->symtab[best].st_value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2699 | return mod->strtab + mod->symtab[best].st_name; |
| 2700 | } |
| 2701 | |
Rusty Russell | 6dd06c9 | 2008-01-29 17:13:22 -0500 | [diff] [blame] | 2702 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
| 2703 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ |
Andrew Morton | 92dfc9d | 2008-02-08 04:18:43 -0800 | [diff] [blame] | 2704 | const char *module_address_lookup(unsigned long addr, |
Rusty Russell | 6dd06c9 | 2008-01-29 17:13:22 -0500 | [diff] [blame] | 2705 | unsigned long *size, |
| 2706 | unsigned long *offset, |
| 2707 | char **modname, |
| 2708 | char *namebuf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2709 | { |
| 2710 | struct module *mod; |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 2711 | const char *ret = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2712 | |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 2713 | preempt_disable(); |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 2714 | list_for_each_entry_rcu(mod, &modules, list) { |
Masami Hiramatsu | a06f621 | 2009-01-06 14:41:49 -0800 | [diff] [blame] | 2715 | if (within_module_init(addr, mod) || |
| 2716 | within_module_core(addr, mod)) { |
Franck Bui-Huu | ffc5089 | 2006-10-03 01:13:48 -0700 | [diff] [blame] | 2717 | if (modname) |
| 2718 | *modname = mod->name; |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 2719 | ret = get_ksymbol(mod, addr, size, offset); |
| 2720 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2721 | } |
| 2722 | } |
Rusty Russell | 6dd06c9 | 2008-01-29 17:13:22 -0500 | [diff] [blame] | 2723 | /* Make a copy in here where it's safe */ |
| 2724 | if (ret) { |
| 2725 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); |
| 2726 | ret = namebuf; |
| 2727 | } |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 2728 | preempt_enable(); |
Andrew Morton | 92dfc9d | 2008-02-08 04:18:43 -0800 | [diff] [blame] | 2729 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2730 | } |
| 2731 | |
Alexey Dobriyan | 9d65cb4 | 2007-05-08 00:28:43 -0700 | [diff] [blame] | 2732 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
| 2733 | { |
| 2734 | struct module *mod; |
| 2735 | |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 2736 | preempt_disable(); |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 2737 | list_for_each_entry_rcu(mod, &modules, list) { |
Masami Hiramatsu | a06f621 | 2009-01-06 14:41:49 -0800 | [diff] [blame] | 2738 | if (within_module_init(addr, mod) || |
| 2739 | within_module_core(addr, mod)) { |
Alexey Dobriyan | 9d65cb4 | 2007-05-08 00:28:43 -0700 | [diff] [blame] | 2740 | const char *sym; |
| 2741 | |
| 2742 | sym = get_ksymbol(mod, addr, NULL, NULL); |
| 2743 | if (!sym) |
| 2744 | goto out; |
Tejun Heo | 9281ace | 2007-07-17 04:03:51 -0700 | [diff] [blame] | 2745 | strlcpy(symname, sym, KSYM_NAME_LEN); |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 2746 | preempt_enable(); |
Alexey Dobriyan | 9d65cb4 | 2007-05-08 00:28:43 -0700 | [diff] [blame] | 2747 | return 0; |
| 2748 | } |
| 2749 | } |
| 2750 | out: |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 2751 | preempt_enable(); |
Alexey Dobriyan | 9d65cb4 | 2007-05-08 00:28:43 -0700 | [diff] [blame] | 2752 | return -ERANGE; |
| 2753 | } |
| 2754 | |
Alexey Dobriyan | a5c43da | 2007-05-08 00:28:47 -0700 | [diff] [blame] | 2755 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
| 2756 | unsigned long *offset, char *modname, char *name) |
| 2757 | { |
| 2758 | struct module *mod; |
| 2759 | |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 2760 | preempt_disable(); |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 2761 | list_for_each_entry_rcu(mod, &modules, list) { |
Masami Hiramatsu | a06f621 | 2009-01-06 14:41:49 -0800 | [diff] [blame] | 2762 | if (within_module_init(addr, mod) || |
| 2763 | within_module_core(addr, mod)) { |
Alexey Dobriyan | a5c43da | 2007-05-08 00:28:47 -0700 | [diff] [blame] | 2764 | const char *sym; |
| 2765 | |
| 2766 | sym = get_ksymbol(mod, addr, size, offset); |
| 2767 | if (!sym) |
| 2768 | goto out; |
| 2769 | if (modname) |
Tejun Heo | 9281ace | 2007-07-17 04:03:51 -0700 | [diff] [blame] | 2770 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
Alexey Dobriyan | a5c43da | 2007-05-08 00:28:47 -0700 | [diff] [blame] | 2771 | if (name) |
Tejun Heo | 9281ace | 2007-07-17 04:03:51 -0700 | [diff] [blame] | 2772 | strlcpy(name, sym, KSYM_NAME_LEN); |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 2773 | preempt_enable(); |
Alexey Dobriyan | a5c43da | 2007-05-08 00:28:47 -0700 | [diff] [blame] | 2774 | return 0; |
| 2775 | } |
| 2776 | } |
| 2777 | out: |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 2778 | preempt_enable(); |
Alexey Dobriyan | a5c43da | 2007-05-08 00:28:47 -0700 | [diff] [blame] | 2779 | return -ERANGE; |
| 2780 | } |
| 2781 | |
Alexey Dobriyan | ea07890 | 2007-05-08 00:28:39 -0700 | [diff] [blame] | 2782 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
| 2783 | char *name, char *module_name, int *exported) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2784 | { |
| 2785 | struct module *mod; |
| 2786 | |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 2787 | preempt_disable(); |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 2788 | list_for_each_entry_rcu(mod, &modules, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2789 | if (symnum < mod->num_symtab) { |
| 2790 | *value = mod->symtab[symnum].st_value; |
| 2791 | *type = mod->symtab[symnum].st_info; |
Andreas Gruenbacher | 098c5ee | 2006-07-14 00:24:04 -0700 | [diff] [blame] | 2792 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
Tejun Heo | 9281ace | 2007-07-17 04:03:51 -0700 | [diff] [blame] | 2793 | KSYM_NAME_LEN); |
| 2794 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
Tim Abbott | ca4787b | 2009-01-05 08:40:10 -0600 | [diff] [blame] | 2795 | *exported = is_exported(name, *value, mod); |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 2796 | preempt_enable(); |
Alexey Dobriyan | ea07890 | 2007-05-08 00:28:39 -0700 | [diff] [blame] | 2797 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2798 | } |
| 2799 | symnum -= mod->num_symtab; |
| 2800 | } |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 2801 | preempt_enable(); |
Alexey Dobriyan | ea07890 | 2007-05-08 00:28:39 -0700 | [diff] [blame] | 2802 | return -ERANGE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2803 | } |
| 2804 | |
| 2805 | static unsigned long mod_find_symname(struct module *mod, const char *name) |
| 2806 | { |
| 2807 | unsigned int i; |
| 2808 | |
| 2809 | for (i = 0; i < mod->num_symtab; i++) |
Keith Owens | 54e8ce4 | 2006-02-03 03:03:53 -0800 | [diff] [blame] | 2810 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
| 2811 | mod->symtab[i].st_info != 'U') |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2812 | return mod->symtab[i].st_value; |
| 2813 | return 0; |
| 2814 | } |
| 2815 | |
| 2816 | /* Look for this name: can be of form module:name. */ |
| 2817 | unsigned long module_kallsyms_lookup_name(const char *name) |
| 2818 | { |
| 2819 | struct module *mod; |
| 2820 | char *colon; |
| 2821 | unsigned long ret = 0; |
| 2822 | |
| 2823 | /* Don't lock: we're in enough trouble already. */ |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 2824 | preempt_disable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2825 | if ((colon = strchr(name, ':')) != NULL) { |
| 2826 | *colon = '\0'; |
| 2827 | if ((mod = find_module(name)) != NULL) |
| 2828 | ret = mod_find_symname(mod, colon+1); |
| 2829 | *colon = ':'; |
| 2830 | } else { |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 2831 | list_for_each_entry_rcu(mod, &modules, list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2832 | if ((ret = mod_find_symname(mod, name)) != 0) |
| 2833 | break; |
| 2834 | } |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 2835 | preempt_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2836 | return ret; |
| 2837 | } |
Anders Kaseorg | 75a6661 | 2008-12-05 19:03:58 -0500 | [diff] [blame] | 2838 | |
| 2839 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, |
| 2840 | struct module *, unsigned long), |
| 2841 | void *data) |
| 2842 | { |
| 2843 | struct module *mod; |
| 2844 | unsigned int i; |
| 2845 | int ret; |
| 2846 | |
| 2847 | list_for_each_entry(mod, &modules, list) { |
| 2848 | for (i = 0; i < mod->num_symtab; i++) { |
| 2849 | ret = fn(data, mod->strtab + mod->symtab[i].st_name, |
| 2850 | mod, mod->symtab[i].st_value); |
| 2851 | if (ret != 0) |
| 2852 | return ret; |
| 2853 | } |
| 2854 | } |
| 2855 | return 0; |
| 2856 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2857 | #endif /* CONFIG_KALLSYMS */ |
| 2858 | |
Arjan van de Ven | 21aa928 | 2008-01-25 21:08:33 +0100 | [diff] [blame] | 2859 | static char *module_flags(struct module *mod, char *buf) |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 2860 | { |
| 2861 | int bx = 0; |
| 2862 | |
Arjan van de Ven | 21aa928 | 2008-01-25 21:08:33 +0100 | [diff] [blame] | 2863 | if (mod->taints || |
| 2864 | mod->state == MODULE_STATE_GOING || |
| 2865 | mod->state == MODULE_STATE_COMING) { |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 2866 | buf[bx++] = '('; |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 2867 | if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 2868 | buf[bx++] = 'P'; |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 2869 | if (mod->taints & (1 << TAINT_FORCED_MODULE)) |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 2870 | buf[bx++] = 'F'; |
Linus Torvalds | 26e9a39 | 2008-10-17 09:50:12 -0700 | [diff] [blame] | 2871 | if (mod->taints & (1 << TAINT_CRAP)) |
Greg Kroah-Hartman | 061b1bd | 2008-09-24 14:46:44 -0700 | [diff] [blame] | 2872 | buf[bx++] = 'C'; |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 2873 | /* |
| 2874 | * TAINT_FORCED_RMMOD: could be added. |
| 2875 | * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't |
| 2876 | * apply to modules. |
| 2877 | */ |
Arjan van de Ven | 21aa928 | 2008-01-25 21:08:33 +0100 | [diff] [blame] | 2878 | |
| 2879 | /* Show a - for module-is-being-unloaded */ |
| 2880 | if (mod->state == MODULE_STATE_GOING) |
| 2881 | buf[bx++] = '-'; |
| 2882 | /* Show a + for module-is-being-loaded */ |
| 2883 | if (mod->state == MODULE_STATE_COMING) |
| 2884 | buf[bx++] = '+'; |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 2885 | buf[bx++] = ')'; |
| 2886 | } |
| 2887 | buf[bx] = '\0'; |
| 2888 | |
| 2889 | return buf; |
| 2890 | } |
| 2891 | |
Alexey Dobriyan | 3b5d5c6 | 2008-10-06 13:19:27 +0400 | [diff] [blame] | 2892 | #ifdef CONFIG_PROC_FS |
| 2893 | /* Called by the /proc file system to return a list of modules. */ |
| 2894 | static void *m_start(struct seq_file *m, loff_t *pos) |
| 2895 | { |
| 2896 | mutex_lock(&module_mutex); |
| 2897 | return seq_list_start(&modules, *pos); |
| 2898 | } |
| 2899 | |
| 2900 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) |
| 2901 | { |
| 2902 | return seq_list_next(p, &modules, pos); |
| 2903 | } |
| 2904 | |
| 2905 | static void m_stop(struct seq_file *m, void *p) |
| 2906 | { |
| 2907 | mutex_unlock(&module_mutex); |
| 2908 | } |
| 2909 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2910 | static int m_show(struct seq_file *m, void *p) |
| 2911 | { |
| 2912 | struct module *mod = list_entry(p, struct module, list); |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 2913 | char buf[8]; |
| 2914 | |
Denys Vlasenko | 2f0f2a3 | 2008-07-22 19:24:27 -0500 | [diff] [blame] | 2915 | seq_printf(m, "%s %u", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2916 | mod->name, mod->init_size + mod->core_size); |
| 2917 | print_unload_info(m, mod); |
| 2918 | |
| 2919 | /* Informative for users. */ |
| 2920 | seq_printf(m, " %s", |
| 2921 | mod->state == MODULE_STATE_GOING ? "Unloading": |
| 2922 | mod->state == MODULE_STATE_COMING ? "Loading": |
| 2923 | "Live"); |
| 2924 | /* Used by oprofile and other similar tools. */ |
| 2925 | seq_printf(m, " 0x%p", mod->module_core); |
| 2926 | |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 2927 | /* Taints info */ |
| 2928 | if (mod->taints) |
Arjan van de Ven | 21aa928 | 2008-01-25 21:08:33 +0100 | [diff] [blame] | 2929 | seq_printf(m, " %s", module_flags(mod, buf)); |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 2930 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2931 | seq_printf(m, "\n"); |
| 2932 | return 0; |
| 2933 | } |
| 2934 | |
| 2935 | /* Format: modulename size refcount deps address |
| 2936 | |
| 2937 | Where refcount is a number or -, and deps is a comma-separated list |
| 2938 | of depends or -. |
| 2939 | */ |
Alexey Dobriyan | 3b5d5c6 | 2008-10-06 13:19:27 +0400 | [diff] [blame] | 2940 | static const struct seq_operations modules_op = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2941 | .start = m_start, |
| 2942 | .next = m_next, |
| 2943 | .stop = m_stop, |
| 2944 | .show = m_show |
| 2945 | }; |
| 2946 | |
Alexey Dobriyan | 3b5d5c6 | 2008-10-06 13:19:27 +0400 | [diff] [blame] | 2947 | static int modules_open(struct inode *inode, struct file *file) |
| 2948 | { |
| 2949 | return seq_open(file, &modules_op); |
| 2950 | } |
| 2951 | |
| 2952 | static const struct file_operations proc_modules_operations = { |
| 2953 | .open = modules_open, |
| 2954 | .read = seq_read, |
| 2955 | .llseek = seq_lseek, |
| 2956 | .release = seq_release, |
| 2957 | }; |
| 2958 | |
| 2959 | static int __init proc_modules_init(void) |
| 2960 | { |
| 2961 | proc_create("modules", 0, NULL, &proc_modules_operations); |
| 2962 | return 0; |
| 2963 | } |
| 2964 | module_init(proc_modules_init); |
| 2965 | #endif |
| 2966 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2967 | /* Given an address, look for it in the module exception tables. */ |
| 2968 | const struct exception_table_entry *search_module_extables(unsigned long addr) |
| 2969 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2970 | const struct exception_table_entry *e = NULL; |
| 2971 | struct module *mod; |
| 2972 | |
Rusty Russell | 24da1cb | 2007-07-15 23:41:46 -0700 | [diff] [blame] | 2973 | preempt_disable(); |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 2974 | list_for_each_entry_rcu(mod, &modules, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2975 | if (mod->num_exentries == 0) |
| 2976 | continue; |
Daniel Walker | 22a8bde | 2007-10-18 03:06:07 -0700 | [diff] [blame] | 2977 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2978 | e = search_extable(mod->extable, |
| 2979 | mod->extable + mod->num_exentries - 1, |
| 2980 | addr); |
| 2981 | if (e) |
| 2982 | break; |
| 2983 | } |
Rusty Russell | 24da1cb | 2007-07-15 23:41:46 -0700 | [diff] [blame] | 2984 | preempt_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2985 | |
| 2986 | /* Now, if we found one, we are running inside it now, hence |
Daniel Walker | 22a8bde | 2007-10-18 03:06:07 -0700 | [diff] [blame] | 2987 | we cannot unload the module, hence no refcnt needed. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2988 | return e; |
| 2989 | } |
| 2990 | |
Ingo Molnar | 4d435f9 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 2991 | /* |
Rusty Russell | e610499 | 2009-03-31 13:05:31 -0600 | [diff] [blame] | 2992 | * is_module_address - is this address inside a module? |
| 2993 | * @addr: the address to check. |
| 2994 | * |
| 2995 | * See is_module_text_address() if you simply want to see if the address |
| 2996 | * is code (not data). |
Ingo Molnar | 4d435f9 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 2997 | */ |
Rusty Russell | e610499 | 2009-03-31 13:05:31 -0600 | [diff] [blame] | 2998 | bool is_module_address(unsigned long addr) |
Ingo Molnar | 4d435f9 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 2999 | { |
Rusty Russell | e610499 | 2009-03-31 13:05:31 -0600 | [diff] [blame] | 3000 | bool ret; |
Ingo Molnar | 4d435f9 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 3001 | |
Rusty Russell | 24da1cb | 2007-07-15 23:41:46 -0700 | [diff] [blame] | 3002 | preempt_disable(); |
Rusty Russell | e610499 | 2009-03-31 13:05:31 -0600 | [diff] [blame] | 3003 | ret = __module_address(addr) != NULL; |
Rusty Russell | 24da1cb | 2007-07-15 23:41:46 -0700 | [diff] [blame] | 3004 | preempt_enable(); |
Ingo Molnar | 4d435f9 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 3005 | |
Rusty Russell | e610499 | 2009-03-31 13:05:31 -0600 | [diff] [blame] | 3006 | return ret; |
Ingo Molnar | 4d435f9 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 3007 | } |
| 3008 | |
Rusty Russell | e610499 | 2009-03-31 13:05:31 -0600 | [diff] [blame] | 3009 | /* |
| 3010 | * __module_address - get the module which contains an address. |
| 3011 | * @addr: the address. |
| 3012 | * |
| 3013 | * Must be called with preempt disabled or module mutex held so that |
| 3014 | * module doesn't get freed during this. |
| 3015 | */ |
Linus Torvalds | 714f83d | 2009-04-05 11:04:19 -0700 | [diff] [blame] | 3016 | struct module *__module_address(unsigned long addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3017 | { |
| 3018 | struct module *mod; |
| 3019 | |
Rusty Russell | 3a642e9 | 2008-07-22 19:24:28 -0500 | [diff] [blame] | 3020 | if (addr < module_addr_min || addr > module_addr_max) |
| 3021 | return NULL; |
| 3022 | |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 3023 | list_for_each_entry_rcu(mod, &modules, list) |
Rusty Russell | e610499 | 2009-03-31 13:05:31 -0600 | [diff] [blame] | 3024 | if (within_module_core(addr, mod) |
| 3025 | || within_module_init(addr, mod)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3026 | return mod; |
| 3027 | return NULL; |
| 3028 | } |
Tim Abbott | c6b3780 | 2008-12-05 19:03:59 -0500 | [diff] [blame] | 3029 | EXPORT_SYMBOL_GPL(__module_address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3030 | |
Rusty Russell | e610499 | 2009-03-31 13:05:31 -0600 | [diff] [blame] | 3031 | /* |
| 3032 | * is_module_text_address - is this address inside module code? |
| 3033 | * @addr: the address to check. |
| 3034 | * |
| 3035 | * See is_module_address() if you simply want to see if the address is |
| 3036 | * anywhere in a module. See kernel_text_address() for testing if an |
| 3037 | * address corresponds to kernel or module code. |
| 3038 | */ |
| 3039 | bool is_module_text_address(unsigned long addr) |
| 3040 | { |
| 3041 | bool ret; |
| 3042 | |
| 3043 | preempt_disable(); |
| 3044 | ret = __module_text_address(addr) != NULL; |
| 3045 | preempt_enable(); |
| 3046 | |
| 3047 | return ret; |
| 3048 | } |
| 3049 | |
| 3050 | /* |
| 3051 | * __module_text_address - get the module whose code contains an address. |
| 3052 | * @addr: the address. |
| 3053 | * |
| 3054 | * Must be called with preempt disabled or module mutex held so that |
| 3055 | * module doesn't get freed during this. |
| 3056 | */ |
| 3057 | struct module *__module_text_address(unsigned long addr) |
| 3058 | { |
| 3059 | struct module *mod = __module_address(addr); |
| 3060 | if (mod) { |
| 3061 | /* Make sure it's within the text section. */ |
| 3062 | if (!within(addr, mod->module_init, mod->init_text_size) |
| 3063 | && !within(addr, mod->module_core, mod->core_text_size)) |
| 3064 | mod = NULL; |
| 3065 | } |
| 3066 | return mod; |
| 3067 | } |
Tim Abbott | c6b3780 | 2008-12-05 19:03:59 -0500 | [diff] [blame] | 3068 | EXPORT_SYMBOL_GPL(__module_text_address); |
Rusty Russell | e610499 | 2009-03-31 13:05:31 -0600 | [diff] [blame] | 3069 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3070 | /* Don't grab lock, we're oopsing. */ |
| 3071 | void print_modules(void) |
| 3072 | { |
| 3073 | struct module *mod; |
Randy Dunlap | 2bc2d61 | 2006-10-02 02:17:02 -0700 | [diff] [blame] | 3074 | char buf[8]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3075 | |
Linus Torvalds | b231125 | 2009-06-16 11:07:14 -0700 | [diff] [blame] | 3076 | printk(KERN_DEFAULT "Modules linked in:"); |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 3077 | /* Most callers should already have preempt disabled, but make sure */ |
| 3078 | preempt_disable(); |
| 3079 | list_for_each_entry_rcu(mod, &modules, list) |
Arjan van de Ven | 21aa928 | 2008-01-25 21:08:33 +0100 | [diff] [blame] | 3080 | printk(" %s%s", mod->name, module_flags(mod, buf)); |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 3081 | preempt_enable(); |
Arjan van de Ven | e14af7e | 2008-01-25 21:08:33 +0100 | [diff] [blame] | 3082 | if (last_unloaded_module[0]) |
| 3083 | printk(" [last unloaded: %s]", last_unloaded_module); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3084 | printk("\n"); |
| 3085 | } |
| 3086 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3087 | #ifdef CONFIG_MODVERSIONS |
Rusty Russell | 8c8ef42 | 2009-03-31 13:05:34 -0600 | [diff] [blame] | 3088 | /* Generate the signature for all relevant module structures here. |
| 3089 | * If these change, we don't want to try to parse the module. */ |
| 3090 | void module_layout(struct module *mod, |
| 3091 | struct modversion_info *ver, |
| 3092 | struct kernel_param *kp, |
| 3093 | struct kernel_symbol *ks, |
| 3094 | struct marker *marker, |
| 3095 | struct tracepoint *tp) |
| 3096 | { |
| 3097 | } |
| 3098 | EXPORT_SYMBOL(module_layout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3099 | #endif |
Mathieu Desnoyers | 8256e47 | 2007-10-18 23:41:06 -0700 | [diff] [blame] | 3100 | |
Mathieu Desnoyers | 97e1c18 | 2008-07-18 12:16:16 -0400 | [diff] [blame] | 3101 | #ifdef CONFIG_TRACEPOINTS |
| 3102 | void module_update_tracepoints(void) |
| 3103 | { |
| 3104 | struct module *mod; |
| 3105 | |
| 3106 | mutex_lock(&module_mutex); |
| 3107 | list_for_each_entry(mod, &modules, list) |
| 3108 | if (!mod->taints) |
| 3109 | tracepoint_update_probe_range(mod->tracepoints, |
| 3110 | mod->tracepoints + mod->num_tracepoints); |
| 3111 | mutex_unlock(&module_mutex); |
| 3112 | } |
| 3113 | |
| 3114 | /* |
| 3115 | * Returns 0 if current not found. |
| 3116 | * Returns 1 if current found. |
| 3117 | */ |
| 3118 | int module_get_iter_tracepoints(struct tracepoint_iter *iter) |
| 3119 | { |
| 3120 | struct module *iter_mod; |
| 3121 | int found = 0; |
| 3122 | |
| 3123 | mutex_lock(&module_mutex); |
| 3124 | list_for_each_entry(iter_mod, &modules, list) { |
| 3125 | if (!iter_mod->taints) { |
| 3126 | /* |
| 3127 | * Sorted module list |
| 3128 | */ |
| 3129 | if (iter_mod < iter->module) |
| 3130 | continue; |
| 3131 | else if (iter_mod > iter->module) |
| 3132 | iter->tracepoint = NULL; |
| 3133 | found = tracepoint_get_iter_range(&iter->tracepoint, |
| 3134 | iter_mod->tracepoints, |
| 3135 | iter_mod->tracepoints |
| 3136 | + iter_mod->num_tracepoints); |
| 3137 | if (found) { |
| 3138 | iter->module = iter_mod; |
| 3139 | break; |
| 3140 | } |
| 3141 | } |
| 3142 | } |
| 3143 | mutex_unlock(&module_mutex); |
| 3144 | return found; |
| 3145 | } |
| 3146 | #endif |