blob: 4edbd9c11aca35a71e56bc237ef638d596a7db23 [file] [log] [blame]
Arjan van de Venf71d20e2006-06-28 04:26:45 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 Copyright (C) 2002 Richard Henderson
Rusty Russell51f3d0f2010-08-05 12:59:13 -06003 Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004
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*/
Paul Gortmaker9984de12011-05-23 14:51:41 -040019#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/moduleloader.h>
Steven Rostedt6d723732009-04-10 14:53:50 -040021#include <linux/ftrace_event.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/init.h>
Alexey Dobriyanae84e322007-05-08 00:28:38 -070023#include <linux/kallsyms.h>
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +040024#include <linux/fs.h>
Roland McGrath6d760132007-10-16 23:26:40 -070025#include <linux/sysfs.h>
Randy Dunlap9f158332005-09-13 01:25:16 -070026#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/slab.h>
28#include <linux/vmalloc.h>
29#include <linux/elf.h>
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +040030#include <linux/proc_fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/seq_file.h>
32#include <linux/syscalls.h>
33#include <linux/fcntl.h>
34#include <linux/rcupdate.h>
Randy.Dunlapc59ede72006-01-11 12:17:46 -080035#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#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 Virof6a57032006-10-18 01:47:25 -040042#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <linux/stop_machine.h>
44#include <linux/device.h>
Matt Domschc988d2b2005-06-23 22:05:15 -070045#include <linux/string.h>
Arjan van de Ven97d1f152006-03-23 03:00:24 -080046#include <linux/mutex.h>
Andi Kleend72b3752008-08-30 10:09:00 +020047#include <linux/rculist.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <asm/cacheflush.h>
Bernd Schmidteb8cdec2009-09-21 17:03:57 -070050#include <asm/mmu_context.h>
Sam Ravnborgb817f6f2006-06-09 21:53:55 +020051#include <linux/license.h>
Christoph Lameter6d762392008-02-08 04:18:42 -080052#include <asm/sections.h>
Mathieu Desnoyers97e1c182008-07-18 12:16:16 -040053#include <linux/tracepoint.h>
Steven Rostedt90d595f2008-08-14 15:45:09 -040054#include <linux/ftrace.h>
Arjan van de Ven22a9d642009-01-07 08:45:46 -080055#include <linux/async.h>
Tejun Heofbf59bc2009-02-20 16:29:08 +090056#include <linux/percpu.h>
Catalin Marinas4f2294b2009-06-11 13:23:20 +010057#include <linux/kmemleak.h>
Jason Baronbf5438fc2010-09-17 11:09:00 -040058#include <linux/jump_label.h>
matthieu castet84e1c6b2010-11-16 22:35:16 +010059#include <linux/pfn.h>
Alessio Igor Bogani403ed272011-04-20 11:10:52 +020060#include <linux/bsearch.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Li Zefan7ead8b82009-08-17 16:56:28 +080062#define CREATE_TRACE_POINTS
63#include <trace/events/module.h>
64
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#ifndef ARCH_SHF_SMALL
66#define ARCH_SHF_SMALL 0
67#endif
68
matthieu castet84e1c6b2010-11-16 22:35:16 +010069/*
70 * Modules' sections will be aligned on page boundaries
71 * to ensure complete separation of code and data, but
72 * only when CONFIG_DEBUG_SET_MODULE_RONX=y
73 */
74#ifdef CONFIG_DEBUG_SET_MODULE_RONX
75# define debug_align(X) ALIGN(X, PAGE_SIZE)
76#else
77# define debug_align(X) (X)
78#endif
79
80/*
81 * Given BASE and SIZE this macro calculates the number of pages the
82 * memory regions occupies
83 */
84#define MOD_NUMBER_OF_PAGES(BASE, SIZE) (((SIZE) > 0) ? \
85 (PFN_DOWN((unsigned long)(BASE) + (SIZE) - 1) - \
86 PFN_DOWN((unsigned long)BASE) + 1) \
87 : (0UL))
88
Linus Torvalds1da177e2005-04-16 15:20:36 -070089/* If this is set, the section belongs in the init part of the module */
90#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
91
Rusty Russell75676502010-06-05 11:17:36 -060092/*
93 * Mutex protects:
94 * 1) List of modules (also safely readable with preempt_disable),
95 * 2) module_use links,
96 * 3) module_addr_min/module_addr_max.
Andi Kleend72b3752008-08-30 10:09:00 +020097 * (delete uses stop_machine/add uses RCU list operations). */
Tim Abbottc6b37802008-12-05 19:03:59 -050098DEFINE_MUTEX(module_mutex);
99EXPORT_SYMBOL_GPL(module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100static LIST_HEAD(modules);
Jason Wessel67fc4e02010-05-20 21:04:21 -0500101#ifdef CONFIG_KGDB_KDB
102struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
103#endif /* CONFIG_KGDB_KDB */
104
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
Stephen Rothwell19e45292009-04-14 17:27:18 +1000106/* Block module loading/unloading? */
107int modules_disabled = 0;
Dave Young02608be2012-02-01 10:33:14 +0800108core_param(nomodule, modules_disabled, bint, 0);
Stephen Rothwell19e45292009-04-14 17:27:18 +1000109
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500110/* Waiting for a module to finish initializing? */
111static DECLARE_WAIT_QUEUE_HEAD(module_wq);
112
Alan Sterne041c682006-03-27 01:16:30 -0800113static BLOCKING_NOTIFIER_HEAD(module_notify_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Rusty Russell75676502010-06-05 11:17:36 -0600115/* Bounds of module allocation, for speeding __module_address.
116 * Protected by module_mutex. */
Rusty Russell3a642e92008-07-22 19:24:28 -0500117static unsigned long module_addr_min = -1UL, module_addr_max = 0;
118
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119int register_module_notifier(struct notifier_block * nb)
120{
Alan Sterne041c682006-03-27 01:16:30 -0800121 return blocking_notifier_chain_register(&module_notify_list, nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122}
123EXPORT_SYMBOL(register_module_notifier);
124
125int unregister_module_notifier(struct notifier_block * nb)
126{
Alan Sterne041c682006-03-27 01:16:30 -0800127 return blocking_notifier_chain_unregister(&module_notify_list, nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128}
129EXPORT_SYMBOL(unregister_module_notifier);
130
Rusty Russelleded41c2010-08-05 12:59:07 -0600131struct load_info {
132 Elf_Ehdr *hdr;
133 unsigned long len;
134 Elf_Shdr *sechdrs;
Rusty Russell6526c532010-08-05 12:59:10 -0600135 char *secstrings, *strtab;
Rusty Russelld9131882010-08-05 12:59:08 -0600136 unsigned long symoffs, stroffs;
Rusty Russell811d66a2010-08-05 12:59:12 -0600137 struct _ddebug *debug;
138 unsigned int num_debug;
Rusty Russelleded41c2010-08-05 12:59:07 -0600139 struct {
140 unsigned int sym, str, mod, vers, info, pcpu;
141 } index;
142};
143
Matti Linnanvuori9a4b9702007-11-08 08:37:38 -0800144/* We require a truly strong try_module_get(): 0 means failure due to
145 ongoing or failed initialization etc. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146static inline int strong_try_module_get(struct module *mod)
147{
148 if (mod && mod->state == MODULE_STATE_COMING)
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500149 return -EBUSY;
150 if (try_module_get(mod))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 return 0;
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500152 else
153 return -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154}
155
Florin Malitafa3ba2e82006-10-11 01:21:48 -0700156static inline void add_taint_module(struct module *mod, unsigned flag)
157{
158 add_taint(flag);
Andi Kleen25ddbb12008-10-15 22:01:41 -0700159 mod->taints |= (1U << flag);
Florin Malitafa3ba2e82006-10-11 01:21:48 -0700160}
161
Robert P. J. Day02a3e592007-05-09 07:26:28 +0200162/*
163 * A thread that wants to hold a reference to a module only while it
164 * is running can call this to safely exit. nfsd and lockd use this.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 */
166void __module_put_and_exit(struct module *mod, long code)
167{
168 module_put(mod);
169 do_exit(code);
170}
171EXPORT_SYMBOL(__module_put_and_exit);
Daniel Walker22a8bde2007-10-18 03:06:07 -0700172
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173/* Find a module section: 0 means not found. */
Rusty Russell49668682010-08-05 12:59:10 -0600174static unsigned int find_sec(const struct load_info *info, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175{
176 unsigned int i;
177
Rusty Russell49668682010-08-05 12:59:10 -0600178 for (i = 1; i < info->hdr->e_shnum; i++) {
179 Elf_Shdr *shdr = &info->sechdrs[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 /* Alloc bit cleared means "ignore it." */
Rusty Russell49668682010-08-05 12:59:10 -0600181 if ((shdr->sh_flags & SHF_ALLOC)
182 && strcmp(info->secstrings + shdr->sh_name, name) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 return i;
Rusty Russell49668682010-08-05 12:59:10 -0600184 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 return 0;
186}
187
Rusty Russell5e458cc2008-10-22 10:00:13 -0500188/* Find a module section, or NULL. */
Rusty Russell49668682010-08-05 12:59:10 -0600189static void *section_addr(const struct load_info *info, const char *name)
Rusty Russell5e458cc2008-10-22 10:00:13 -0500190{
191 /* Section 0 has sh_addr 0. */
Rusty Russell49668682010-08-05 12:59:10 -0600192 return (void *)info->sechdrs[find_sec(info, name)].sh_addr;
Rusty Russell5e458cc2008-10-22 10:00:13 -0500193}
194
195/* Find a module section, or NULL. Fill in number of "objects" in section. */
Rusty Russell49668682010-08-05 12:59:10 -0600196static void *section_objs(const struct load_info *info,
Rusty Russell5e458cc2008-10-22 10:00:13 -0500197 const char *name,
198 size_t object_size,
199 unsigned int *num)
200{
Rusty Russell49668682010-08-05 12:59:10 -0600201 unsigned int sec = find_sec(info, name);
Rusty Russell5e458cc2008-10-22 10:00:13 -0500202
203 /* Section 0 has sh_addr 0 and sh_size 0. */
Rusty Russell49668682010-08-05 12:59:10 -0600204 *num = info->sechdrs[sec].sh_size / object_size;
205 return (void *)info->sechdrs[sec].sh_addr;
Rusty Russell5e458cc2008-10-22 10:00:13 -0500206}
207
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208/* Provided by the linker */
209extern const struct kernel_symbol __start___ksymtab[];
210extern const struct kernel_symbol __stop___ksymtab[];
211extern const struct kernel_symbol __start___ksymtab_gpl[];
212extern const struct kernel_symbol __stop___ksymtab_gpl[];
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -0800213extern const struct kernel_symbol __start___ksymtab_gpl_future[];
214extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215extern const unsigned long __start___kcrctab[];
216extern const unsigned long __start___kcrctab_gpl[];
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -0800217extern const unsigned long __start___kcrctab_gpl_future[];
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500218#ifdef CONFIG_UNUSED_SYMBOLS
219extern const struct kernel_symbol __start___ksymtab_unused[];
220extern const struct kernel_symbol __stop___ksymtab_unused[];
221extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
222extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700223extern const unsigned long __start___kcrctab_unused[];
224extern const unsigned long __start___kcrctab_unused_gpl[];
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500225#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
227#ifndef CONFIG_MODVERSIONS
228#define symversion(base, idx) NULL
229#else
Andrew Mortonf83ca9f2006-03-28 01:56:20 -0800230#define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231#endif
232
Rusty Russelldafd0942008-07-22 19:24:25 -0500233static bool each_symbol_in_section(const struct symsearch *arr,
234 unsigned int arrsize,
235 struct module *owner,
236 bool (*fn)(const struct symsearch *syms,
237 struct module *owner,
Rusty Russellde4d8d52011-04-19 21:49:58 +0200238 void *data),
Rusty Russelldafd0942008-07-22 19:24:25 -0500239 void *data)
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100240{
Rusty Russellde4d8d52011-04-19 21:49:58 +0200241 unsigned int j;
Rusty Russelldafd0942008-07-22 19:24:25 -0500242
243 for (j = 0; j < arrsize; j++) {
Rusty Russellde4d8d52011-04-19 21:49:58 +0200244 if (fn(&arr[j], owner, data))
245 return true;
Rusty Russelldafd0942008-07-22 19:24:25 -0500246 }
247
248 return false;
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100249}
250
Rusty Russelldafd0942008-07-22 19:24:25 -0500251/* Returns true as soon as fn returns true, otherwise false. */
Rusty Russellde4d8d52011-04-19 21:49:58 +0200252bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
253 struct module *owner,
254 void *data),
255 void *data)
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700256{
Rusty Russelldafd0942008-07-22 19:24:25 -0500257 struct module *mod;
Linus Torvalds44032e62010-08-05 12:59:05 -0600258 static const struct symsearch arr[] = {
Rusty Russelldafd0942008-07-22 19:24:25 -0500259 { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
260 NOT_GPL_ONLY, false },
261 { __start___ksymtab_gpl, __stop___ksymtab_gpl,
262 __start___kcrctab_gpl,
263 GPL_ONLY, false },
264 { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
265 __start___kcrctab_gpl_future,
266 WILL_BE_GPL_ONLY, false },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500267#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russelldafd0942008-07-22 19:24:25 -0500268 { __start___ksymtab_unused, __stop___ksymtab_unused,
269 __start___kcrctab_unused,
270 NOT_GPL_ONLY, true },
271 { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
272 __start___kcrctab_unused_gpl,
273 GPL_ONLY, true },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500274#endif
Rusty Russelldafd0942008-07-22 19:24:25 -0500275 };
276
277 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
278 return true;
279
Andi Kleend72b3752008-08-30 10:09:00 +0200280 list_for_each_entry_rcu(mod, &modules, list) {
Rusty Russelldafd0942008-07-22 19:24:25 -0500281 struct symsearch arr[] = {
282 { mod->syms, mod->syms + mod->num_syms, mod->crcs,
283 NOT_GPL_ONLY, false },
284 { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
285 mod->gpl_crcs,
286 GPL_ONLY, false },
287 { mod->gpl_future_syms,
288 mod->gpl_future_syms + mod->num_gpl_future_syms,
289 mod->gpl_future_crcs,
290 WILL_BE_GPL_ONLY, false },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500291#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russelldafd0942008-07-22 19:24:25 -0500292 { mod->unused_syms,
293 mod->unused_syms + mod->num_unused_syms,
294 mod->unused_crcs,
295 NOT_GPL_ONLY, true },
296 { mod->unused_gpl_syms,
297 mod->unused_gpl_syms + mod->num_unused_gpl_syms,
298 mod->unused_gpl_crcs,
299 GPL_ONLY, true },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500300#endif
Rusty Russelldafd0942008-07-22 19:24:25 -0500301 };
302
303 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
304 return true;
305 }
306 return false;
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700307}
Rusty Russellde4d8d52011-04-19 21:49:58 +0200308EXPORT_SYMBOL_GPL(each_symbol_section);
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700309
Rusty Russelldafd0942008-07-22 19:24:25 -0500310struct find_symbol_arg {
311 /* Input */
312 const char *name;
313 bool gplok;
314 bool warn;
315
316 /* Output */
317 struct module *owner;
318 const unsigned long *crc;
Tim Abbott414fd312008-12-05 19:03:56 -0500319 const struct kernel_symbol *sym;
Rusty Russelldafd0942008-07-22 19:24:25 -0500320};
321
Rusty Russellde4d8d52011-04-19 21:49:58 +0200322static bool check_symbol(const struct symsearch *syms,
323 struct module *owner,
324 unsigned int symnum, void *data)
Rusty Russellad9546c2008-05-01 21:14:59 -0500325{
Rusty Russelldafd0942008-07-22 19:24:25 -0500326 struct find_symbol_arg *fsa = data;
327
Rusty Russelldafd0942008-07-22 19:24:25 -0500328 if (!fsa->gplok) {
329 if (syms->licence == GPL_ONLY)
330 return false;
331 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
332 printk(KERN_WARNING "Symbol %s is being used "
333 "by a non-GPL module, which will not "
334 "be allowed in the future\n", fsa->name);
335 printk(KERN_WARNING "Please see the file "
336 "Documentation/feature-removal-schedule.txt "
337 "in the kernel source tree for more details.\n");
338 }
339 }
340
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500341#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russelldafd0942008-07-22 19:24:25 -0500342 if (syms->unused && fsa->warn) {
Rusty Russellad9546c2008-05-01 21:14:59 -0500343 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
Rusty Russelldafd0942008-07-22 19:24:25 -0500344 "however this module is using it.\n", fsa->name);
Rusty Russellad9546c2008-05-01 21:14:59 -0500345 printk(KERN_WARNING
346 "This symbol will go away in the future.\n");
347 printk(KERN_WARNING
348 "Please evalute if this is the right api to use and if "
349 "it really is, submit a report the linux kernel "
350 "mailinglist together with submitting your code for "
351 "inclusion.\n");
352 }
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500353#endif
Rusty Russelldafd0942008-07-22 19:24:25 -0500354
355 fsa->owner = owner;
356 fsa->crc = symversion(syms->crcs, symnum);
Tim Abbott414fd312008-12-05 19:03:56 -0500357 fsa->sym = &syms->start[symnum];
Rusty Russellad9546c2008-05-01 21:14:59 -0500358 return true;
359}
360
Alessio Igor Bogani403ed272011-04-20 11:10:52 +0200361static int cmp_name(const void *va, const void *vb)
362{
363 const char *a;
364 const struct kernel_symbol *b;
365 a = va; b = vb;
366 return strcmp(a, b->name);
367}
368
Rusty Russellde4d8d52011-04-19 21:49:58 +0200369static bool find_symbol_in_section(const struct symsearch *syms,
370 struct module *owner,
371 void *data)
372{
373 struct find_symbol_arg *fsa = data;
Alessio Igor Bogani403ed272011-04-20 11:10:52 +0200374 struct kernel_symbol *sym;
Rusty Russellde4d8d52011-04-19 21:49:58 +0200375
Alessio Igor Bogani403ed272011-04-20 11:10:52 +0200376 sym = bsearch(fsa->name, syms->start, syms->stop - syms->start,
377 sizeof(struct kernel_symbol), cmp_name);
378
379 if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data))
380 return true;
381
Rusty Russellde4d8d52011-04-19 21:49:58 +0200382 return false;
383}
384
Tim Abbott414fd312008-12-05 19:03:56 -0500385/* Find a symbol and return it, along with, (optional) crc and
Rusty Russell75676502010-06-05 11:17:36 -0600386 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
Tim Abbottc6b37802008-12-05 19:03:59 -0500387const struct kernel_symbol *find_symbol(const char *name,
388 struct module **owner,
389 const unsigned long **crc,
390 bool gplok,
391 bool warn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392{
Rusty Russelldafd0942008-07-22 19:24:25 -0500393 struct find_symbol_arg fsa;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
Rusty Russelldafd0942008-07-22 19:24:25 -0500395 fsa.name = name;
396 fsa.gplok = gplok;
397 fsa.warn = warn;
398
Rusty Russellde4d8d52011-04-19 21:49:58 +0200399 if (each_symbol_section(find_symbol_in_section, &fsa)) {
Rusty Russellad9546c2008-05-01 21:14:59 -0500400 if (owner)
Rusty Russelldafd0942008-07-22 19:24:25 -0500401 *owner = fsa.owner;
402 if (crc)
403 *crc = fsa.crc;
Tim Abbott414fd312008-12-05 19:03:56 -0500404 return fsa.sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 }
Rusty Russellad9546c2008-05-01 21:14:59 -0500406
Jim Cromie5e124162011-12-06 12:11:31 -0700407 pr_debug("Failed to find symbol %s\n", name);
Tim Abbott414fd312008-12-05 19:03:56 -0500408 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409}
Tim Abbottc6b37802008-12-05 19:03:59 -0500410EXPORT_SYMBOL_GPL(find_symbol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412/* Search for module by name: must hold module_mutex. */
Tim Abbottc6b37802008-12-05 19:03:59 -0500413struct module *find_module(const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414{
415 struct module *mod;
416
417 list_for_each_entry(mod, &modules, list) {
418 if (strcmp(mod->name, name) == 0)
419 return mod;
420 }
421 return NULL;
422}
Tim Abbottc6b37802008-12-05 19:03:59 -0500423EXPORT_SYMBOL_GPL(find_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
425#ifdef CONFIG_SMP
Tejun Heofbf59bc2009-02-20 16:29:08 +0900426
Tejun Heo259354d2010-03-10 18:56:10 +0900427static inline void __percpu *mod_percpu(struct module *mod)
Tejun Heofbf59bc2009-02-20 16:29:08 +0900428{
Tejun Heo259354d2010-03-10 18:56:10 +0900429 return mod->percpu;
430}
Tejun Heofbf59bc2009-02-20 16:29:08 +0900431
Tejun Heo259354d2010-03-10 18:56:10 +0900432static int percpu_modalloc(struct module *mod,
433 unsigned long size, unsigned long align)
434{
Tejun Heofbf59bc2009-02-20 16:29:08 +0900435 if (align > PAGE_SIZE) {
436 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
Tejun Heo259354d2010-03-10 18:56:10 +0900437 mod->name, align, PAGE_SIZE);
Tejun Heofbf59bc2009-02-20 16:29:08 +0900438 align = PAGE_SIZE;
439 }
440
Tejun Heo259354d2010-03-10 18:56:10 +0900441 mod->percpu = __alloc_reserved_percpu(size, align);
442 if (!mod->percpu) {
Tejun Heofbf59bc2009-02-20 16:29:08 +0900443 printk(KERN_WARNING
Rusty Russelld9131882010-08-05 12:59:08 -0600444 "%s: Could not allocate %lu bytes percpu data\n",
445 mod->name, size);
Tejun Heo259354d2010-03-10 18:56:10 +0900446 return -ENOMEM;
447 }
448 mod->percpu_size = size;
449 return 0;
Tejun Heofbf59bc2009-02-20 16:29:08 +0900450}
451
Tejun Heo259354d2010-03-10 18:56:10 +0900452static void percpu_modfree(struct module *mod)
Tejun Heofbf59bc2009-02-20 16:29:08 +0900453{
Tejun Heo259354d2010-03-10 18:56:10 +0900454 free_percpu(mod->percpu);
Tejun Heofbf59bc2009-02-20 16:29:08 +0900455}
456
Rusty Russell49668682010-08-05 12:59:10 -0600457static unsigned int find_pcpusec(struct load_info *info)
Tejun Heo6b588c12009-02-20 16:29:07 +0900458{
Rusty Russell49668682010-08-05 12:59:10 -0600459 return find_sec(info, ".data..percpu");
Tejun Heo6b588c12009-02-20 16:29:07 +0900460}
461
Tejun Heo259354d2010-03-10 18:56:10 +0900462static void percpu_modcopy(struct module *mod,
463 const void *from, unsigned long size)
Tejun Heo6b588c12009-02-20 16:29:07 +0900464{
465 int cpu;
466
467 for_each_possible_cpu(cpu)
Tejun Heo259354d2010-03-10 18:56:10 +0900468 memcpy(per_cpu_ptr(mod->percpu, cpu), from, size);
Tejun Heo6b588c12009-02-20 16:29:07 +0900469}
470
Tejun Heo10fad5e2010-03-10 18:57:54 +0900471/**
472 * is_module_percpu_address - test whether address is from module static percpu
473 * @addr: address to test
474 *
475 * Test whether @addr belongs to module static percpu area.
476 *
477 * RETURNS:
478 * %true if @addr is from module static percpu area
479 */
480bool is_module_percpu_address(unsigned long addr)
481{
482 struct module *mod;
483 unsigned int cpu;
484
485 preempt_disable();
486
487 list_for_each_entry_rcu(mod, &modules, list) {
488 if (!mod->percpu_size)
489 continue;
490 for_each_possible_cpu(cpu) {
491 void *start = per_cpu_ptr(mod->percpu, cpu);
492
493 if ((void *)addr >= start &&
494 (void *)addr < start + mod->percpu_size) {
495 preempt_enable();
496 return true;
497 }
498 }
499 }
500
501 preempt_enable();
502 return false;
Daniel Walker22a8bde2007-10-18 03:06:07 -0700503}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504
505#else /* ... !CONFIG_SMP */
Tejun Heo6b588c12009-02-20 16:29:07 +0900506
Tejun Heo259354d2010-03-10 18:56:10 +0900507static inline void __percpu *mod_percpu(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508{
509 return NULL;
510}
Tejun Heo259354d2010-03-10 18:56:10 +0900511static inline int percpu_modalloc(struct module *mod,
512 unsigned long size, unsigned long align)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513{
Tejun Heo259354d2010-03-10 18:56:10 +0900514 return -ENOMEM;
515}
516static inline void percpu_modfree(struct module *mod)
517{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518}
Rusty Russell49668682010-08-05 12:59:10 -0600519static unsigned int find_pcpusec(struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520{
521 return 0;
522}
Tejun Heo259354d2010-03-10 18:56:10 +0900523static inline void percpu_modcopy(struct module *mod,
524 const void *from, unsigned long size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525{
526 /* pcpusec should be 0, and size of that section should be 0. */
527 BUG_ON(size != 0);
528}
Tejun Heo10fad5e2010-03-10 18:57:54 +0900529bool is_module_percpu_address(unsigned long addr)
530{
531 return false;
532}
Tejun Heo6b588c12009-02-20 16:29:07 +0900533
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534#endif /* CONFIG_SMP */
535
Matt Domschc988d2b2005-06-23 22:05:15 -0700536#define MODINFO_ATTR(field) \
537static void setup_modinfo_##field(struct module *mod, const char *s) \
538{ \
539 mod->field = kstrdup(s, GFP_KERNEL); \
540} \
541static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
Kay Sievers4befb022011-07-24 22:06:04 +0930542 struct module_kobject *mk, char *buffer) \
Matt Domschc988d2b2005-06-23 22:05:15 -0700543{ \
Kay Sievers4befb022011-07-24 22:06:04 +0930544 return sprintf(buffer, "%s\n", mk->mod->field); \
Matt Domschc988d2b2005-06-23 22:05:15 -0700545} \
546static int modinfo_##field##_exists(struct module *mod) \
547{ \
548 return mod->field != NULL; \
549} \
550static void free_modinfo_##field(struct module *mod) \
551{ \
Daniel Walker22a8bde2007-10-18 03:06:07 -0700552 kfree(mod->field); \
553 mod->field = NULL; \
Matt Domschc988d2b2005-06-23 22:05:15 -0700554} \
555static struct module_attribute modinfo_##field = { \
Tejun Heo7b595752007-06-14 03:45:17 +0900556 .attr = { .name = __stringify(field), .mode = 0444 }, \
Matt Domschc988d2b2005-06-23 22:05:15 -0700557 .show = show_modinfo_##field, \
558 .setup = setup_modinfo_##field, \
559 .test = modinfo_##field##_exists, \
560 .free = free_modinfo_##field, \
561};
562
563MODINFO_ATTR(version);
564MODINFO_ATTR(srcversion);
565
Arjan van de Vene14af7e2008-01-25 21:08:33 +0100566static char last_unloaded_module[MODULE_NAME_LEN+1];
567
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -0800568#ifdef CONFIG_MODULE_UNLOAD
Steven Rostedteb0c5372010-03-29 14:25:18 -0400569
570EXPORT_TRACEPOINT_SYMBOL(module_get);
571
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572/* Init the unload section of the module. */
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600573static int module_unload_init(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574{
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600575 mod->refptr = alloc_percpu(struct module_ref);
576 if (!mod->refptr)
577 return -ENOMEM;
578
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700579 INIT_LIST_HEAD(&mod->source_list);
580 INIT_LIST_HEAD(&mod->target_list);
Christoph Lametere1783a22010-01-05 15:34:50 +0900581
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 /* Hold reference count during initialization. */
Nick Piggin5fbfb182010-04-01 19:09:40 +1100583 __this_cpu_write(mod->refptr->incs, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 /* Backwards compatibility macros put refcount during init. */
585 mod->waiter = current;
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600586
587 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588}
589
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590/* Does a already use b? */
591static int already_uses(struct module *a, struct module *b)
592{
593 struct module_use *use;
594
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700595 list_for_each_entry(use, &b->source_list, source_list) {
596 if (use->source == a) {
Jim Cromie5e124162011-12-06 12:11:31 -0700597 pr_debug("%s uses %s!\n", a->name, b->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 return 1;
599 }
600 }
Jim Cromie5e124162011-12-06 12:11:31 -0700601 pr_debug("%s does not use %s!\n", a->name, b->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 return 0;
603}
604
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700605/*
606 * Module a uses b
607 * - we add 'a' as a "source", 'b' as a "target" of module use
608 * - the module_use is added to the list of 'b' sources (so
609 * 'b' can walk the list to see who sourced them), and of 'a'
610 * targets (so 'a' can see what modules it targets).
611 */
612static int add_module_usage(struct module *a, struct module *b)
613{
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700614 struct module_use *use;
615
Jim Cromie5e124162011-12-06 12:11:31 -0700616 pr_debug("Allocating new usage for %s.\n", a->name);
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700617 use = kmalloc(sizeof(*use), GFP_ATOMIC);
618 if (!use) {
619 printk(KERN_WARNING "%s: out of memory loading\n", a->name);
620 return -ENOMEM;
621 }
622
623 use->source = a;
624 use->target = b;
625 list_add(&use->source_list, &b->source_list);
626 list_add(&use->target_list, &a->target_list);
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700627 return 0;
628}
629
Rusty Russell75676502010-06-05 11:17:36 -0600630/* Module a uses b: caller needs module_mutex() */
Rusty Russell9bea7f22010-06-05 11:17:37 -0600631int ref_module(struct module *a, struct module *b)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632{
Rusty Russellc8e21ce2010-06-05 11:17:35 -0600633 int err;
Kay Sievers270a6c42007-01-18 13:26:15 +0100634
Rusty Russell9bea7f22010-06-05 11:17:37 -0600635 if (b == NULL || already_uses(a, b))
Linus Torvalds218ce732010-05-25 16:48:30 -0700636 return 0;
Linus Torvalds218ce732010-05-25 16:48:30 -0700637
Rusty Russell9bea7f22010-06-05 11:17:37 -0600638 /* If module isn't available, we fail. */
639 err = strong_try_module_get(b);
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500640 if (err)
Rusty Russell9bea7f22010-06-05 11:17:37 -0600641 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700643 err = add_module_usage(a, b);
644 if (err) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 module_put(b);
Rusty Russell9bea7f22010-06-05 11:17:37 -0600646 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 }
Rusty Russell9bea7f22010-06-05 11:17:37 -0600648 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649}
Rusty Russell9bea7f22010-06-05 11:17:37 -0600650EXPORT_SYMBOL_GPL(ref_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651
652/* Clear the unload stuff of the module. */
653static void module_unload_free(struct module *mod)
654{
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700655 struct module_use *use, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656
Rusty Russell75676502010-06-05 11:17:36 -0600657 mutex_lock(&module_mutex);
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700658 list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) {
659 struct module *i = use->target;
Jim Cromie5e124162011-12-06 12:11:31 -0700660 pr_debug("%s unusing %s\n", mod->name, i->name);
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700661 module_put(i);
662 list_del(&use->source_list);
663 list_del(&use->target_list);
664 kfree(use);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 }
Rusty Russell75676502010-06-05 11:17:36 -0600666 mutex_unlock(&module_mutex);
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600667
668 free_percpu(mod->refptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669}
670
671#ifdef CONFIG_MODULE_FORCE_UNLOAD
Akinobu Mitafb169792006-01-08 01:04:29 -0800672static inline int try_force_unload(unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673{
674 int ret = (flags & O_TRUNC);
675 if (ret)
Akinobu Mitafb169792006-01-08 01:04:29 -0800676 add_taint(TAINT_FORCED_RMMOD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 return ret;
678}
679#else
Akinobu Mitafb169792006-01-08 01:04:29 -0800680static inline int try_force_unload(unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681{
682 return 0;
683}
684#endif /* CONFIG_MODULE_FORCE_UNLOAD */
685
686struct stopref
687{
688 struct module *mod;
689 int flags;
690 int *forced;
691};
692
693/* Whole machine is stopped with interrupts off when this runs. */
694static int __try_stop_module(void *_sref)
695{
696 struct stopref *sref = _sref;
697
Rusty Russellda39ba52008-07-22 19:24:25 -0500698 /* If it's not unused, quit unless we're forcing. */
699 if (module_refcount(sref->mod) != 0) {
Akinobu Mitafb169792006-01-08 01:04:29 -0800700 if (!(*sref->forced = try_force_unload(sref->flags)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 return -EWOULDBLOCK;
702 }
703
704 /* Mark it as dying. */
705 sref->mod->state = MODULE_STATE_GOING;
706 return 0;
707}
708
709static int try_stop_module(struct module *mod, int flags, int *forced)
710{
Rusty Russellda39ba52008-07-22 19:24:25 -0500711 if (flags & O_NONBLOCK) {
712 struct stopref sref = { mod, flags, forced };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713
Rusty Russell9b1a4d32008-07-28 12:16:30 -0500714 return stop_machine(__try_stop_module, &sref, NULL);
Rusty Russellda39ba52008-07-22 19:24:25 -0500715 } else {
716 /* We don't need to stop the machine for this. */
717 mod->state = MODULE_STATE_GOING;
718 synchronize_sched();
719 return 0;
720 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721}
722
Eric Dumazetbd77c042012-01-13 09:32:14 +1030723unsigned long module_refcount(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724{
Eric Dumazetbd77c042012-01-13 09:32:14 +1030725 unsigned long incs = 0, decs = 0;
Eric Dumazet720eba32009-02-03 13:31:36 +1030726 int cpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727
Eric Dumazet720eba32009-02-03 13:31:36 +1030728 for_each_possible_cpu(cpu)
Nick Piggin5fbfb182010-04-01 19:09:40 +1100729 decs += per_cpu_ptr(mod->refptr, cpu)->decs;
730 /*
731 * ensure the incs are added up after the decs.
732 * module_put ensures incs are visible before decs with smp_wmb.
733 *
734 * This 2-count scheme avoids the situation where the refcount
735 * for CPU0 is read, then CPU0 increments the module refcount,
736 * then CPU1 drops that refcount, then the refcount for CPU1 is
737 * read. We would record a decrement but not its corresponding
738 * increment so we would see a low count (disaster).
739 *
740 * Rare situation? But module_refcount can be preempted, and we
741 * might be tallying up 4096+ CPUs. So it is not impossible.
742 */
743 smp_rmb();
744 for_each_possible_cpu(cpu)
745 incs += per_cpu_ptr(mod->refptr, cpu)->incs;
746 return incs - decs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747}
748EXPORT_SYMBOL(module_refcount);
749
750/* This exists whether we can unload or not */
751static void free_module(struct module *mod);
752
753static void wait_for_zero_refcount(struct module *mod)
754{
Matthew Wilcoxa6550202008-02-26 10:47:18 -0500755 /* Since we might sleep for some time, release the mutex first */
Ashutosh Naik6389a382006-03-23 03:00:46 -0800756 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 for (;;) {
Jim Cromie5e124162011-12-06 12:11:31 -0700758 pr_debug("Looking at refcount...\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 set_current_state(TASK_UNINTERRUPTIBLE);
760 if (module_refcount(mod) == 0)
761 break;
762 schedule();
763 }
764 current->state = TASK_RUNNING;
Ashutosh Naik6389a382006-03-23 03:00:46 -0800765 mutex_lock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766}
767
Heiko Carstens17da2bd2009-01-14 14:14:10 +0100768SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
769 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770{
771 struct module *mod;
Greg Kroah-Hartmandfff0a02007-02-23 14:54:57 -0800772 char name[MODULE_NAME_LEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 int ret, forced = 0;
774
Kees Cook3d433212009-04-02 15:49:29 -0700775 if (!capable(CAP_SYS_MODULE) || modules_disabled)
Greg Kroah-Hartmandfff0a02007-02-23 14:54:57 -0800776 return -EPERM;
777
778 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
779 return -EFAULT;
780 name[MODULE_NAME_LEN-1] = '\0';
781
Tejun Heo3fc1f1e2010-05-06 18:49:20 +0200782 if (mutex_lock_interruptible(&module_mutex) != 0)
783 return -EINTR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784
785 mod = find_module(name);
786 if (!mod) {
787 ret = -ENOENT;
788 goto out;
789 }
790
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700791 if (!list_empty(&mod->source_list)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 /* Other modules depend on us: get rid of them first. */
793 ret = -EWOULDBLOCK;
794 goto out;
795 }
796
797 /* Doing init or already dying? */
798 if (mod->state != MODULE_STATE_LIVE) {
799 /* FIXME: if (force), slam module count and wake up
800 waiter --RR */
Jim Cromie5e124162011-12-06 12:11:31 -0700801 pr_debug("%s already dying\n", mod->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 ret = -EBUSY;
803 goto out;
804 }
805
806 /* If it has an init func, it must have an exit func to unload */
Rusty Russellaf49d922007-10-16 23:26:27 -0700807 if (mod->init && !mod->exit) {
Akinobu Mitafb169792006-01-08 01:04:29 -0800808 forced = try_force_unload(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 if (!forced) {
810 /* This module can't be removed */
811 ret = -EBUSY;
812 goto out;
813 }
814 }
815
816 /* Set this up before setting mod->state */
817 mod->waiter = current;
818
819 /* Stop the machine so refcounts can't move and disable module. */
820 ret = try_stop_module(mod, flags, &forced);
821 if (ret != 0)
822 goto out;
823
824 /* Never wait if forced. */
825 if (!forced && module_refcount(mod) != 0)
826 wait_for_zero_refcount(mod);
827
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +0200828 mutex_unlock(&module_mutex);
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300829 /* Final destruction now no one is using it. */
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +0200830 if (mod->exit != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 mod->exit();
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +0200832 blocking_notifier_call_chain(&module_notify_list,
833 MODULE_STATE_GOING, mod);
Arjan van de Ven22a9d642009-01-07 08:45:46 -0800834 async_synchronize_full();
Rusty Russell75676502010-06-05 11:17:36 -0600835
Arjan van de Vene14af7e2008-01-25 21:08:33 +0100836 /* Store the name of the last unloaded module for diagnostic purposes */
Rusty Russellefa53452008-01-29 17:13:20 -0500837 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838
Rusty Russell75676502010-06-05 11:17:36 -0600839 free_module(mod);
840 return 0;
841out:
Ashutosh Naik6389a382006-03-23 03:00:46 -0800842 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 return ret;
844}
845
Jianjun Kongd1e99d72008-12-08 14:26:29 +0800846static inline void print_unload_info(struct seq_file *m, struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847{
848 struct module_use *use;
849 int printed_something = 0;
850
Eric Dumazetbd77c042012-01-13 09:32:14 +1030851 seq_printf(m, " %lu ", module_refcount(mod));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852
853 /* Always include a trailing , so userspace can differentiate
854 between this and the old multi-field proc format. */
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700855 list_for_each_entry(use, &mod->source_list, source_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 printed_something = 1;
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700857 seq_printf(m, "%s,", use->source->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 }
859
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 if (mod->init != NULL && mod->exit == NULL) {
861 printed_something = 1;
862 seq_printf(m, "[permanent],");
863 }
864
865 if (!printed_something)
866 seq_printf(m, "-");
867}
868
869void __symbol_put(const char *symbol)
870{
871 struct module *owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872
Rusty Russell24da1cb2007-07-15 23:41:46 -0700873 preempt_disable();
Tim Abbott414fd312008-12-05 19:03:56 -0500874 if (!find_symbol(symbol, &owner, NULL, true, false))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 BUG();
876 module_put(owner);
Rusty Russell24da1cb2007-07-15 23:41:46 -0700877 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878}
879EXPORT_SYMBOL(__symbol_put);
880
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930881/* Note this assumes addr is a function, which it currently always is. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882void symbol_put_addr(void *addr)
883{
Trent Piepho5e376612006-05-15 09:44:06 -0700884 struct module *modaddr;
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930885 unsigned long a = (unsigned long)dereference_function_descriptor(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930887 if (core_kernel_text(a))
Trent Piepho5e376612006-05-15 09:44:06 -0700888 return;
889
Rusty Russella6e6abd2009-03-31 13:05:31 -0600890 /* module_text_address is safe here: we're supposed to have reference
891 * to module from symbol_get, so it can't go away. */
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930892 modaddr = __module_text_address(a);
Rusty Russella6e6abd2009-03-31 13:05:31 -0600893 BUG_ON(!modaddr);
Trent Piepho5e376612006-05-15 09:44:06 -0700894 module_put(modaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895}
896EXPORT_SYMBOL_GPL(symbol_put_addr);
897
898static ssize_t show_refcnt(struct module_attribute *mattr,
Kay Sievers4befb022011-07-24 22:06:04 +0930899 struct module_kobject *mk, char *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900{
Eric Dumazetbd77c042012-01-13 09:32:14 +1030901 return sprintf(buffer, "%lu\n", module_refcount(mk->mod));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902}
903
Kay Sieverscca3e702012-01-13 09:32:15 +1030904static struct module_attribute modinfo_refcnt =
905 __ATTR(refcnt, 0444, show_refcnt, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906
Steven Rostedtd53799b2012-03-26 12:50:52 +1030907void __module_get(struct module *module)
908{
909 if (module) {
910 preempt_disable();
911 __this_cpu_inc(module->refptr->incs);
912 trace_module_get(module, _RET_IP_);
913 preempt_enable();
914 }
915}
916EXPORT_SYMBOL(__module_get);
917
918bool try_module_get(struct module *module)
919{
920 bool ret = true;
921
922 if (module) {
923 preempt_disable();
924
925 if (likely(module_is_live(module))) {
926 __this_cpu_inc(module->refptr->incs);
927 trace_module_get(module, _RET_IP_);
928 } else
929 ret = false;
930
931 preempt_enable();
932 }
933 return ret;
934}
935EXPORT_SYMBOL(try_module_get);
936
Al Virof6a57032006-10-18 01:47:25 -0400937void module_put(struct module *module)
938{
939 if (module) {
Christoph Lametere1783a22010-01-05 15:34:50 +0900940 preempt_disable();
Nick Piggin5fbfb182010-04-01 19:09:40 +1100941 smp_wmb(); /* see comment in module_refcount */
942 __this_cpu_inc(module->refptr->decs);
Christoph Lametere1783a22010-01-05 15:34:50 +0900943
Li Zefanae832d12010-03-24 10:57:43 +0800944 trace_module_put(module, _RET_IP_);
Al Virof6a57032006-10-18 01:47:25 -0400945 /* Maybe they're waiting for us to drop reference? */
946 if (unlikely(!module_is_live(module)))
947 wake_up_process(module->waiter);
Christoph Lametere1783a22010-01-05 15:34:50 +0900948 preempt_enable();
Al Virof6a57032006-10-18 01:47:25 -0400949 }
950}
951EXPORT_SYMBOL(module_put);
952
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953#else /* !CONFIG_MODULE_UNLOAD */
Jianjun Kongd1e99d72008-12-08 14:26:29 +0800954static inline void print_unload_info(struct seq_file *m, struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955{
956 /* We don't know the usage count, or what modules are using. */
957 seq_printf(m, " - -");
958}
959
960static inline void module_unload_free(struct module *mod)
961{
962}
963
Rusty Russell9bea7f22010-06-05 11:17:37 -0600964int ref_module(struct module *a, struct module *b)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965{
Rusty Russell9bea7f22010-06-05 11:17:37 -0600966 return strong_try_module_get(b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967}
Rusty Russell9bea7f22010-06-05 11:17:37 -0600968EXPORT_SYMBOL_GPL(ref_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600970static inline int module_unload_init(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971{
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600972 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973}
974#endif /* CONFIG_MODULE_UNLOAD */
975
Kevin Winchester53999bf2012-01-15 19:32:55 -0400976static size_t module_flags_taint(struct module *mod, char *buf)
977{
978 size_t l = 0;
979
980 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
981 buf[l++] = 'P';
982 if (mod->taints & (1 << TAINT_OOT_MODULE))
983 buf[l++] = 'O';
984 if (mod->taints & (1 << TAINT_FORCED_MODULE))
985 buf[l++] = 'F';
986 if (mod->taints & (1 << TAINT_CRAP))
987 buf[l++] = 'C';
988 /*
989 * TAINT_FORCED_RMMOD: could be added.
990 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
991 * apply to modules.
992 */
993 return l;
994}
995
Kay Sievers1f717402006-11-24 12:15:25 +0100996static ssize_t show_initstate(struct module_attribute *mattr,
Kay Sievers4befb022011-07-24 22:06:04 +0930997 struct module_kobject *mk, char *buffer)
Kay Sievers1f717402006-11-24 12:15:25 +0100998{
999 const char *state = "unknown";
1000
Kay Sievers4befb022011-07-24 22:06:04 +09301001 switch (mk->mod->state) {
Kay Sievers1f717402006-11-24 12:15:25 +01001002 case MODULE_STATE_LIVE:
1003 state = "live";
1004 break;
1005 case MODULE_STATE_COMING:
1006 state = "coming";
1007 break;
1008 case MODULE_STATE_GOING:
1009 state = "going";
1010 break;
1011 }
1012 return sprintf(buffer, "%s\n", state);
1013}
1014
Kay Sieverscca3e702012-01-13 09:32:15 +10301015static struct module_attribute modinfo_initstate =
1016 __ATTR(initstate, 0444, show_initstate, NULL);
Kay Sievers1f717402006-11-24 12:15:25 +01001017
Kay Sievers88bfa322011-07-24 22:06:04 +09301018static ssize_t store_uevent(struct module_attribute *mattr,
1019 struct module_kobject *mk,
1020 const char *buffer, size_t count)
1021{
1022 enum kobject_action action;
1023
1024 if (kobject_action_type(buffer, count, &action) == 0)
1025 kobject_uevent(&mk->kobj, action);
1026 return count;
1027}
1028
Kay Sieverscca3e702012-01-13 09:32:15 +10301029struct module_attribute module_uevent =
1030 __ATTR(uevent, 0200, NULL, store_uevent);
1031
1032static ssize_t show_coresize(struct module_attribute *mattr,
1033 struct module_kobject *mk, char *buffer)
1034{
1035 return sprintf(buffer, "%u\n", mk->mod->core_size);
1036}
1037
1038static struct module_attribute modinfo_coresize =
1039 __ATTR(coresize, 0444, show_coresize, NULL);
1040
1041static ssize_t show_initsize(struct module_attribute *mattr,
1042 struct module_kobject *mk, char *buffer)
1043{
1044 return sprintf(buffer, "%u\n", mk->mod->init_size);
1045}
1046
1047static struct module_attribute modinfo_initsize =
1048 __ATTR(initsize, 0444, show_initsize, NULL);
1049
1050static ssize_t show_taint(struct module_attribute *mattr,
1051 struct module_kobject *mk, char *buffer)
1052{
1053 size_t l;
1054
1055 l = module_flags_taint(mk->mod, buffer);
1056 buffer[l++] = '\n';
1057 return l;
1058}
1059
1060static struct module_attribute modinfo_taint =
1061 __ATTR(taint, 0444, show_taint, NULL);
Kay Sievers88bfa322011-07-24 22:06:04 +09301062
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001063static struct module_attribute *modinfo_attrs[] = {
Kay Sieverscca3e702012-01-13 09:32:15 +10301064 &module_uevent,
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001065 &modinfo_version,
1066 &modinfo_srcversion,
Kay Sieverscca3e702012-01-13 09:32:15 +10301067 &modinfo_initstate,
1068 &modinfo_coresize,
1069 &modinfo_initsize,
1070 &modinfo_taint,
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001071#ifdef CONFIG_MODULE_UNLOAD
Kay Sieverscca3e702012-01-13 09:32:15 +10301072 &modinfo_refcnt,
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001073#endif
1074 NULL,
1075};
1076
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077static const char vermagic[] = VERMAGIC_STRING;
1078
Rusty Russellc6e665c2009-03-31 13:05:33 -06001079static int try_to_force_load(struct module *mod, const char *reason)
Linus Torvalds826e4502008-05-04 17:04:16 -07001080{
1081#ifdef CONFIG_MODULE_FORCE_LOAD
Andi Kleen25ddbb12008-10-15 22:01:41 -07001082 if (!test_taint(TAINT_FORCED_MODULE))
Rusty Russellc6e665c2009-03-31 13:05:33 -06001083 printk(KERN_WARNING "%s: %s: kernel tainted.\n",
1084 mod->name, reason);
Linus Torvalds826e4502008-05-04 17:04:16 -07001085 add_taint_module(mod, TAINT_FORCED_MODULE);
1086 return 0;
1087#else
1088 return -ENOEXEC;
1089#endif
1090}
1091
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092#ifdef CONFIG_MODVERSIONS
Rusty Russelld4703ae2009-12-15 16:28:32 -06001093/* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
1094static unsigned long maybe_relocated(unsigned long crc,
1095 const struct module *crc_owner)
1096{
1097#ifdef ARCH_RELOCATES_KCRCTAB
1098 if (crc_owner == NULL)
1099 return crc - (unsigned long)reloc_start;
1100#endif
1101 return crc;
1102}
1103
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104static int check_version(Elf_Shdr *sechdrs,
1105 unsigned int versindex,
1106 const char *symname,
1107 struct module *mod,
Rusty Russelld4703ae2009-12-15 16:28:32 -06001108 const unsigned long *crc,
1109 const struct module *crc_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110{
1111 unsigned int i, num_versions;
1112 struct modversion_info *versions;
1113
1114 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1115 if (!crc)
1116 return 1;
1117
Rusty Russella5dd6972008-05-09 16:24:21 +10001118 /* No versions at all? modprobe --force does this. */
1119 if (versindex == 0)
1120 return try_to_force_load(mod, symname) == 0;
1121
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 versions = (void *) sechdrs[versindex].sh_addr;
1123 num_versions = sechdrs[versindex].sh_size
1124 / sizeof(struct modversion_info);
1125
1126 for (i = 0; i < num_versions; i++) {
1127 if (strcmp(versions[i].name, symname) != 0)
1128 continue;
1129
Rusty Russelld4703ae2009-12-15 16:28:32 -06001130 if (versions[i].crc == maybe_relocated(*crc, crc_owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131 return 1;
Jim Cromie5e124162011-12-06 12:11:31 -07001132 pr_debug("Found checksum %lX vs module %lX\n",
Rusty Russelld4703ae2009-12-15 16:28:32 -06001133 maybe_relocated(*crc, crc_owner), versions[i].crc);
Linus Torvalds826e4502008-05-04 17:04:16 -07001134 goto bad_version;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 }
Linus Torvalds826e4502008-05-04 17:04:16 -07001136
Rusty Russella5dd6972008-05-09 16:24:21 +10001137 printk(KERN_WARNING "%s: no symbol version for %s\n",
1138 mod->name, symname);
1139 return 0;
Linus Torvalds826e4502008-05-04 17:04:16 -07001140
1141bad_version:
1142 printk("%s: disagrees about version of symbol %s\n",
1143 mod->name, symname);
1144 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145}
1146
1147static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1148 unsigned int versindex,
1149 struct module *mod)
1150{
1151 const unsigned long *crc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152
Rusty Russell75676502010-06-05 11:17:36 -06001153 /* Since this should be found in kernel (which can't be removed),
1154 * no locking is necessary. */
Mike Frysinger6560dc12009-07-23 23:42:08 +09301155 if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL,
1156 &crc, true, false))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 BUG();
Rusty Russelld4703ae2009-12-15 16:28:32 -06001158 return check_version(sechdrs, versindex, "module_layout", mod, crc,
1159 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160}
1161
Rusty Russell91e37a72008-05-09 16:25:28 +10001162/* First part is kernel version, which we ignore if module has crcs. */
1163static inline int same_magic(const char *amagic, const char *bmagic,
1164 bool has_crcs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165{
Rusty Russell91e37a72008-05-09 16:25:28 +10001166 if (has_crcs) {
1167 amagic += strcspn(amagic, " ");
1168 bmagic += strcspn(bmagic, " ");
1169 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 return strcmp(amagic, bmagic) == 0;
1171}
1172#else
1173static inline int check_version(Elf_Shdr *sechdrs,
1174 unsigned int versindex,
1175 const char *symname,
1176 struct module *mod,
Rusty Russelld4703ae2009-12-15 16:28:32 -06001177 const unsigned long *crc,
1178 const struct module *crc_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179{
1180 return 1;
1181}
1182
1183static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1184 unsigned int versindex,
1185 struct module *mod)
1186{
1187 return 1;
1188}
1189
Rusty Russell91e37a72008-05-09 16:25:28 +10001190static inline int same_magic(const char *amagic, const char *bmagic,
1191 bool has_crcs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192{
1193 return strcmp(amagic, bmagic) == 0;
1194}
1195#endif /* CONFIG_MODVERSIONS */
1196
Rusty Russell75676502010-06-05 11:17:36 -06001197/* Resolve a symbol for this module. I.e. if we find one, record usage. */
Rusty Russell49668682010-08-05 12:59:10 -06001198static const struct kernel_symbol *resolve_symbol(struct module *mod,
1199 const struct load_info *info,
Tim Abbott414fd312008-12-05 19:03:56 -05001200 const char *name,
Rusty Russell9bea7f22010-06-05 11:17:37 -06001201 char ownername[])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202{
1203 struct module *owner;
Tim Abbott414fd312008-12-05 19:03:56 -05001204 const struct kernel_symbol *sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 const unsigned long *crc;
Rusty Russell9bea7f22010-06-05 11:17:37 -06001206 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207
Rusty Russell75676502010-06-05 11:17:36 -06001208 mutex_lock(&module_mutex);
Tim Abbott414fd312008-12-05 19:03:56 -05001209 sym = find_symbol(name, &owner, &crc,
Andi Kleen25ddbb12008-10-15 22:01:41 -07001210 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
Rusty Russell9bea7f22010-06-05 11:17:37 -06001211 if (!sym)
1212 goto unlock;
1213
Rusty Russell49668682010-08-05 12:59:10 -06001214 if (!check_version(info->sechdrs, info->index.vers, name, mod, crc,
1215 owner)) {
Rusty Russell9bea7f22010-06-05 11:17:37 -06001216 sym = ERR_PTR(-EINVAL);
1217 goto getname;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218 }
Rusty Russell9bea7f22010-06-05 11:17:37 -06001219
1220 err = ref_module(mod, owner);
1221 if (err) {
1222 sym = ERR_PTR(err);
1223 goto getname;
1224 }
1225
1226getname:
1227 /* We must make copy under the lock if we failed to get ref. */
1228 strncpy(ownername, module_name(owner), MODULE_NAME_LEN);
1229unlock:
Rusty Russell75676502010-06-05 11:17:36 -06001230 mutex_unlock(&module_mutex);
Linus Torvalds218ce732010-05-25 16:48:30 -07001231 return sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232}
1233
Rusty Russell49668682010-08-05 12:59:10 -06001234static const struct kernel_symbol *
1235resolve_symbol_wait(struct module *mod,
1236 const struct load_info *info,
1237 const char *name)
Rusty Russell9bea7f22010-06-05 11:17:37 -06001238{
1239 const struct kernel_symbol *ksym;
Rusty Russell49668682010-08-05 12:59:10 -06001240 char owner[MODULE_NAME_LEN];
Rusty Russell9bea7f22010-06-05 11:17:37 -06001241
1242 if (wait_event_interruptible_timeout(module_wq,
Rusty Russell49668682010-08-05 12:59:10 -06001243 !IS_ERR(ksym = resolve_symbol(mod, info, name, owner))
1244 || PTR_ERR(ksym) != -EBUSY,
Rusty Russell9bea7f22010-06-05 11:17:37 -06001245 30 * HZ) <= 0) {
1246 printk(KERN_WARNING "%s: gave up waiting for init of module %s.\n",
Rusty Russell49668682010-08-05 12:59:10 -06001247 mod->name, owner);
Rusty Russell9bea7f22010-06-05 11:17:37 -06001248 }
1249 return ksym;
1250}
1251
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252/*
1253 * /sys/module/foo/sections stuff
1254 * J. Corbet <corbet@lwn.net>
1255 */
Rusty Russell8f6d0372010-08-05 12:59:09 -06001256#ifdef CONFIG_SYSFS
Ben Hutchings10b465a2009-12-19 14:43:01 +00001257
Rusty Russell8f6d0372010-08-05 12:59:09 -06001258#ifdef CONFIG_KALLSYMS
Ben Hutchings10b465a2009-12-19 14:43:01 +00001259static inline bool sect_empty(const Elf_Shdr *sect)
1260{
1261 return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
1262}
1263
Rusty Russella58730c2008-03-13 09:03:44 +00001264struct module_sect_attr
1265{
1266 struct module_attribute mattr;
1267 char *name;
1268 unsigned long address;
1269};
1270
1271struct module_sect_attrs
1272{
1273 struct attribute_group grp;
1274 unsigned int nsections;
1275 struct module_sect_attr attrs[0];
1276};
1277
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278static ssize_t module_sect_show(struct module_attribute *mattr,
Kay Sievers4befb022011-07-24 22:06:04 +09301279 struct module_kobject *mk, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280{
1281 struct module_sect_attr *sattr =
1282 container_of(mattr, struct module_sect_attr, mattr);
Kees Cook9f36e2c2011-03-22 16:34:22 -07001283 return sprintf(buf, "0x%pK\n", (void *)sattr->address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284}
1285
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001286static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1287{
Rusty Russella58730c2008-03-13 09:03:44 +00001288 unsigned int section;
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001289
1290 for (section = 0; section < sect_attrs->nsections; section++)
1291 kfree(sect_attrs->attrs[section].name);
1292 kfree(sect_attrs);
1293}
1294
Rusty Russell8f6d0372010-08-05 12:59:09 -06001295static void add_sect_attrs(struct module *mod, const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296{
1297 unsigned int nloaded = 0, i, size[2];
1298 struct module_sect_attrs *sect_attrs;
1299 struct module_sect_attr *sattr;
1300 struct attribute **gattr;
Daniel Walker22a8bde2007-10-18 03:06:07 -07001301
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302 /* Count loaded sections and allocate structures */
Rusty Russell8f6d0372010-08-05 12:59:09 -06001303 for (i = 0; i < info->hdr->e_shnum; i++)
1304 if (!sect_empty(&info->sechdrs[i]))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305 nloaded++;
1306 size[0] = ALIGN(sizeof(*sect_attrs)
1307 + nloaded * sizeof(sect_attrs->attrs[0]),
1308 sizeof(sect_attrs->grp.attrs[0]));
1309 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001310 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1311 if (sect_attrs == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 return;
1313
1314 /* Setup section attributes. */
1315 sect_attrs->grp.name = "sections";
1316 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1317
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001318 sect_attrs->nsections = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319 sattr = &sect_attrs->attrs[0];
1320 gattr = &sect_attrs->grp.attrs[0];
Rusty Russell8f6d0372010-08-05 12:59:09 -06001321 for (i = 0; i < info->hdr->e_shnum; i++) {
1322 Elf_Shdr *sec = &info->sechdrs[i];
1323 if (sect_empty(sec))
Helge Deller35dead42009-12-03 00:29:15 +01001324 continue;
Rusty Russell8f6d0372010-08-05 12:59:09 -06001325 sattr->address = sec->sh_addr;
1326 sattr->name = kstrdup(info->secstrings + sec->sh_name,
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001327 GFP_KERNEL);
1328 if (sattr->name == NULL)
1329 goto out;
1330 sect_attrs->nsections++;
Eric W. Biederman361795b2010-02-12 13:41:56 -08001331 sysfs_attr_init(&sattr->mattr.attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332 sattr->mattr.show = module_sect_show;
1333 sattr->mattr.store = NULL;
1334 sattr->mattr.attr.name = sattr->name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 sattr->mattr.attr.mode = S_IRUGO;
1336 *(gattr++) = &(sattr++)->mattr.attr;
1337 }
1338 *gattr = NULL;
1339
1340 if (sysfs_create_group(&mod->mkobj.kobj, &sect_attrs->grp))
1341 goto out;
1342
1343 mod->sect_attrs = sect_attrs;
1344 return;
1345 out:
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001346 free_sect_attrs(sect_attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347}
1348
1349static void remove_sect_attrs(struct module *mod)
1350{
1351 if (mod->sect_attrs) {
1352 sysfs_remove_group(&mod->mkobj.kobj,
1353 &mod->sect_attrs->grp);
1354 /* We are positive that no one is using any sect attrs
1355 * at this point. Deallocate immediately. */
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001356 free_sect_attrs(mod->sect_attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357 mod->sect_attrs = NULL;
1358 }
1359}
1360
Roland McGrath6d760132007-10-16 23:26:40 -07001361/*
1362 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1363 */
1364
1365struct module_notes_attrs {
1366 struct kobject *dir;
1367 unsigned int notes;
1368 struct bin_attribute attrs[0];
1369};
1370
Chris Wright2c3c8be2010-05-12 18:28:57 -07001371static ssize_t module_notes_read(struct file *filp, struct kobject *kobj,
Roland McGrath6d760132007-10-16 23:26:40 -07001372 struct bin_attribute *bin_attr,
1373 char *buf, loff_t pos, size_t count)
1374{
1375 /*
1376 * The caller checked the pos and count against our size.
1377 */
1378 memcpy(buf, bin_attr->private + pos, count);
1379 return count;
1380}
1381
1382static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1383 unsigned int i)
1384{
1385 if (notes_attrs->dir) {
1386 while (i-- > 0)
1387 sysfs_remove_bin_file(notes_attrs->dir,
1388 &notes_attrs->attrs[i]);
Alexey Dobriyane9432092008-09-23 23:51:11 +04001389 kobject_put(notes_attrs->dir);
Roland McGrath6d760132007-10-16 23:26:40 -07001390 }
1391 kfree(notes_attrs);
1392}
1393
Rusty Russell8f6d0372010-08-05 12:59:09 -06001394static void add_notes_attrs(struct module *mod, const struct load_info *info)
Roland McGrath6d760132007-10-16 23:26:40 -07001395{
1396 unsigned int notes, loaded, i;
1397 struct module_notes_attrs *notes_attrs;
1398 struct bin_attribute *nattr;
1399
Ingo Molnarea6bff32009-08-28 10:44:56 +02001400 /* failed to create section attributes, so can't create notes */
1401 if (!mod->sect_attrs)
1402 return;
1403
Roland McGrath6d760132007-10-16 23:26:40 -07001404 /* Count notes sections and allocate structures. */
1405 notes = 0;
Rusty Russell8f6d0372010-08-05 12:59:09 -06001406 for (i = 0; i < info->hdr->e_shnum; i++)
1407 if (!sect_empty(&info->sechdrs[i]) &&
1408 (info->sechdrs[i].sh_type == SHT_NOTE))
Roland McGrath6d760132007-10-16 23:26:40 -07001409 ++notes;
1410
1411 if (notes == 0)
1412 return;
1413
1414 notes_attrs = kzalloc(sizeof(*notes_attrs)
1415 + notes * sizeof(notes_attrs->attrs[0]),
1416 GFP_KERNEL);
1417 if (notes_attrs == NULL)
1418 return;
1419
1420 notes_attrs->notes = notes;
1421 nattr = &notes_attrs->attrs[0];
Rusty Russell8f6d0372010-08-05 12:59:09 -06001422 for (loaded = i = 0; i < info->hdr->e_shnum; ++i) {
1423 if (sect_empty(&info->sechdrs[i]))
Roland McGrath6d760132007-10-16 23:26:40 -07001424 continue;
Rusty Russell8f6d0372010-08-05 12:59:09 -06001425 if (info->sechdrs[i].sh_type == SHT_NOTE) {
Eric W. Biederman361795b2010-02-12 13:41:56 -08001426 sysfs_bin_attr_init(nattr);
Roland McGrath6d760132007-10-16 23:26:40 -07001427 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1428 nattr->attr.mode = S_IRUGO;
Rusty Russell8f6d0372010-08-05 12:59:09 -06001429 nattr->size = info->sechdrs[i].sh_size;
1430 nattr->private = (void *) info->sechdrs[i].sh_addr;
Roland McGrath6d760132007-10-16 23:26:40 -07001431 nattr->read = module_notes_read;
1432 ++nattr;
1433 }
1434 ++loaded;
1435 }
1436
Greg Kroah-Hartman4ff6abf2007-11-05 22:24:43 -08001437 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
Roland McGrath6d760132007-10-16 23:26:40 -07001438 if (!notes_attrs->dir)
1439 goto out;
1440
1441 for (i = 0; i < notes; ++i)
1442 if (sysfs_create_bin_file(notes_attrs->dir,
1443 &notes_attrs->attrs[i]))
1444 goto out;
1445
1446 mod->notes_attrs = notes_attrs;
1447 return;
1448
1449 out:
1450 free_notes_attrs(notes_attrs, i);
1451}
1452
1453static void remove_notes_attrs(struct module *mod)
1454{
1455 if (mod->notes_attrs)
1456 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1457}
1458
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459#else
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001460
Rusty Russell8f6d0372010-08-05 12:59:09 -06001461static inline void add_sect_attrs(struct module *mod,
1462 const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463{
1464}
1465
1466static inline void remove_sect_attrs(struct module *mod)
1467{
1468}
Roland McGrath6d760132007-10-16 23:26:40 -07001469
Rusty Russell8f6d0372010-08-05 12:59:09 -06001470static inline void add_notes_attrs(struct module *mod,
1471 const struct load_info *info)
Roland McGrath6d760132007-10-16 23:26:40 -07001472{
1473}
1474
1475static inline void remove_notes_attrs(struct module *mod)
1476{
1477}
Rusty Russell8f6d0372010-08-05 12:59:09 -06001478#endif /* CONFIG_KALLSYMS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001480static void add_usage_links(struct module *mod)
1481{
1482#ifdef CONFIG_MODULE_UNLOAD
1483 struct module_use *use;
1484 int nowarn;
1485
Rusty Russell75676502010-06-05 11:17:36 -06001486 mutex_lock(&module_mutex);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001487 list_for_each_entry(use, &mod->target_list, target_list) {
1488 nowarn = sysfs_create_link(use->target->holders_dir,
1489 &mod->mkobj.kobj, mod->name);
1490 }
Rusty Russell75676502010-06-05 11:17:36 -06001491 mutex_unlock(&module_mutex);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001492#endif
1493}
1494
1495static void del_usage_links(struct module *mod)
1496{
1497#ifdef CONFIG_MODULE_UNLOAD
1498 struct module_use *use;
1499
Rusty Russell75676502010-06-05 11:17:36 -06001500 mutex_lock(&module_mutex);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001501 list_for_each_entry(use, &mod->target_list, target_list)
1502 sysfs_remove_link(use->target->holders_dir, mod->name);
Rusty Russell75676502010-06-05 11:17:36 -06001503 mutex_unlock(&module_mutex);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001504#endif
1505}
1506
Rusty Russell6407ebb22010-06-05 11:17:36 -06001507static int module_add_modinfo_attrs(struct module *mod)
Matt Domschc988d2b2005-06-23 22:05:15 -07001508{
1509 struct module_attribute *attr;
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001510 struct module_attribute *temp_attr;
Matt Domschc988d2b2005-06-23 22:05:15 -07001511 int error = 0;
1512 int i;
1513
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001514 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1515 (ARRAY_SIZE(modinfo_attrs) + 1)),
1516 GFP_KERNEL);
1517 if (!mod->modinfo_attrs)
1518 return -ENOMEM;
1519
1520 temp_attr = mod->modinfo_attrs;
Matt Domschc988d2b2005-06-23 22:05:15 -07001521 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1522 if (!attr->test ||
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001523 (attr->test && attr->test(mod))) {
1524 memcpy(temp_attr, attr, sizeof(*temp_attr));
Eric W. Biederman361795b2010-02-12 13:41:56 -08001525 sysfs_attr_init(&temp_attr->attr);
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001526 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1527 ++temp_attr;
1528 }
Matt Domschc988d2b2005-06-23 22:05:15 -07001529 }
1530 return error;
1531}
1532
Rusty Russell6407ebb22010-06-05 11:17:36 -06001533static void module_remove_modinfo_attrs(struct module *mod)
Matt Domschc988d2b2005-06-23 22:05:15 -07001534{
1535 struct module_attribute *attr;
1536 int i;
1537
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001538 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1539 /* pick a field to test for end of list */
1540 if (!attr->attr.name)
1541 break;
Matt Domschc988d2b2005-06-23 22:05:15 -07001542 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001543 if (attr->free)
1544 attr->free(mod);
Matt Domschc988d2b2005-06-23 22:05:15 -07001545 }
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001546 kfree(mod->modinfo_attrs);
Matt Domschc988d2b2005-06-23 22:05:15 -07001547}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548
Rusty Russell6407ebb22010-06-05 11:17:36 -06001549static int mod_sysfs_init(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550{
1551 int err;
Greg Kroah-Hartman6494a932008-01-27 15:38:40 -08001552 struct kobject *kobj;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553
Greg Kroah-Hartman823bccf2007-04-13 13:15:19 -07001554 if (!module_sysfs_initialized) {
1555 printk(KERN_ERR "%s: module sysfs not initialized\n",
Ed Swierk1cc5f712006-09-25 16:25:36 -07001556 mod->name);
1557 err = -EINVAL;
1558 goto out;
1559 }
Greg Kroah-Hartman6494a932008-01-27 15:38:40 -08001560
1561 kobj = kset_find_obj(module_kset, mod->name);
1562 if (kobj) {
1563 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1564 kobject_put(kobj);
1565 err = -EINVAL;
1566 goto out;
1567 }
1568
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569 mod->mkobj.mod = mod;
Kay Sieverse17e0f52006-11-24 12:15:25 +01001570
Greg Kroah-Hartmanac3c8142007-12-17 23:05:35 -07001571 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1572 mod->mkobj.kobj.kset = module_kset;
1573 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1574 "%s", mod->name);
1575 if (err)
1576 kobject_put(&mod->mkobj.kobj);
Kay Sievers270a6c42007-01-18 13:26:15 +01001577
Kay Sievers97c146e2007-11-29 23:46:11 +01001578 /* delay uevent until full sysfs population */
Kay Sievers270a6c42007-01-18 13:26:15 +01001579out:
1580 return err;
1581}
1582
Rusty Russell6407ebb22010-06-05 11:17:36 -06001583static int mod_sysfs_setup(struct module *mod,
Rusty Russell8f6d0372010-08-05 12:59:09 -06001584 const struct load_info *info,
Kay Sievers270a6c42007-01-18 13:26:15 +01001585 struct kernel_param *kparam,
1586 unsigned int num_params)
1587{
1588 int err;
1589
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001590 err = mod_sysfs_init(mod);
1591 if (err)
1592 goto out;
1593
Greg Kroah-Hartman4ff6abf2007-11-05 22:24:43 -08001594 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
Akinobu Mita240936e2007-04-26 00:12:09 -07001595 if (!mod->holders_dir) {
1596 err = -ENOMEM;
Kay Sievers270a6c42007-01-18 13:26:15 +01001597 goto out_unreg;
Akinobu Mita240936e2007-04-26 00:12:09 -07001598 }
Kay Sievers270a6c42007-01-18 13:26:15 +01001599
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600 err = module_param_sysfs_setup(mod, kparam, num_params);
1601 if (err)
Kay Sievers270a6c42007-01-18 13:26:15 +01001602 goto out_unreg_holders;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603
Matt Domschc988d2b2005-06-23 22:05:15 -07001604 err = module_add_modinfo_attrs(mod);
1605 if (err)
Kay Sieverse17e0f52006-11-24 12:15:25 +01001606 goto out_unreg_param;
Matt Domschc988d2b2005-06-23 22:05:15 -07001607
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001608 add_usage_links(mod);
Rusty Russell8f6d0372010-08-05 12:59:09 -06001609 add_sect_attrs(mod, info);
1610 add_notes_attrs(mod, info);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001611
Kay Sieverse17e0f52006-11-24 12:15:25 +01001612 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613 return 0;
1614
Kay Sieverse17e0f52006-11-24 12:15:25 +01001615out_unreg_param:
1616 module_param_sysfs_remove(mod);
Kay Sievers270a6c42007-01-18 13:26:15 +01001617out_unreg_holders:
Greg Kroah-Hartman78a2d902007-12-20 08:13:05 -08001618 kobject_put(mod->holders_dir);
Kay Sievers270a6c42007-01-18 13:26:15 +01001619out_unreg:
Kay Sieverse17e0f52006-11-24 12:15:25 +01001620 kobject_put(&mod->mkobj.kobj);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001621out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001622 return err;
1623}
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001624
1625static void mod_sysfs_fini(struct module *mod)
1626{
Rusty Russell8f6d0372010-08-05 12:59:09 -06001627 remove_notes_attrs(mod);
1628 remove_sect_attrs(mod);
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001629 kobject_put(&mod->mkobj.kobj);
1630}
1631
Rusty Russell8f6d0372010-08-05 12:59:09 -06001632#else /* !CONFIG_SYSFS */
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001633
Rusty Russell8f6d0372010-08-05 12:59:09 -06001634static int mod_sysfs_setup(struct module *mod,
1635 const struct load_info *info,
Rusty Russell6407ebb22010-06-05 11:17:36 -06001636 struct kernel_param *kparam,
1637 unsigned int num_params)
1638{
1639 return 0;
1640}
1641
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001642static void mod_sysfs_fini(struct module *mod)
1643{
1644}
1645
Rusty Russell36b03602010-08-05 12:59:09 -06001646static void module_remove_modinfo_attrs(struct module *mod)
1647{
1648}
1649
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001650static void del_usage_links(struct module *mod)
1651{
1652}
1653
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001654#endif /* CONFIG_SYSFS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655
Rusty Russell36b03602010-08-05 12:59:09 -06001656static void mod_sysfs_teardown(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001657{
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001658 del_usage_links(mod);
Matt Domschc988d2b2005-06-23 22:05:15 -07001659 module_remove_modinfo_attrs(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660 module_param_sysfs_remove(mod);
Greg Kroah-Hartman78a2d902007-12-20 08:13:05 -08001661 kobject_put(mod->mkobj.drivers_dir);
1662 kobject_put(mod->holders_dir);
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001663 mod_sysfs_fini(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001664}
1665
1666/*
1667 * unlink the module with the whole machine is stopped with interrupts off
1668 * - this defends against kallsyms not taking locks
1669 */
1670static int __unlink_module(void *_mod)
1671{
1672 struct module *mod = _mod;
1673 list_del(&mod->list);
Linus Torvalds53363772010-10-05 11:29:27 -07001674 module_bug_cleanup(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675 return 0;
1676}
1677
matthieu castet84e1c6b2010-11-16 22:35:16 +01001678#ifdef CONFIG_DEBUG_SET_MODULE_RONX
1679/*
1680 * LKM RO/NX protection: protect module's text/ro-data
1681 * from modification and any data from execution.
1682 */
1683void set_page_attributes(void *start, void *end, int (*set)(unsigned long start, int num_pages))
1684{
1685 unsigned long begin_pfn = PFN_DOWN((unsigned long)start);
1686 unsigned long end_pfn = PFN_DOWN((unsigned long)end);
1687
1688 if (end_pfn > begin_pfn)
1689 set(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn);
1690}
1691
1692static void set_section_ro_nx(void *base,
1693 unsigned long text_size,
1694 unsigned long ro_size,
1695 unsigned long total_size)
1696{
1697 /* begin and end PFNs of the current subsection */
1698 unsigned long begin_pfn;
1699 unsigned long end_pfn;
1700
1701 /*
1702 * Set RO for module text and RO-data:
1703 * - Always protect first page.
1704 * - Do not protect last partial page.
1705 */
1706 if (ro_size > 0)
1707 set_page_attributes(base, base + ro_size, set_memory_ro);
1708
1709 /*
1710 * Set NX permissions for module data:
1711 * - Do not protect first partial page.
1712 * - Always protect last page.
1713 */
1714 if (total_size > text_size) {
1715 begin_pfn = PFN_UP((unsigned long)base + text_size);
1716 end_pfn = PFN_UP((unsigned long)base + total_size);
1717 if (end_pfn > begin_pfn)
1718 set_memory_nx(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn);
1719 }
1720}
1721
Jan Glauber01526ed2011-05-19 16:55:26 -06001722static void unset_module_core_ro_nx(struct module *mod)
matthieu castet84e1c6b2010-11-16 22:35:16 +01001723{
Jan Glauber01526ed2011-05-19 16:55:26 -06001724 set_page_attributes(mod->module_core + mod->core_text_size,
1725 mod->module_core + mod->core_size,
1726 set_memory_x);
1727 set_page_attributes(mod->module_core,
1728 mod->module_core + mod->core_ro_size,
1729 set_memory_rw);
1730}
1731
1732static void unset_module_init_ro_nx(struct module *mod)
1733{
1734 set_page_attributes(mod->module_init + mod->init_text_size,
1735 mod->module_init + mod->init_size,
1736 set_memory_x);
1737 set_page_attributes(mod->module_init,
1738 mod->module_init + mod->init_ro_size,
1739 set_memory_rw);
matthieu castet84e1c6b2010-11-16 22:35:16 +01001740}
1741
1742/* Iterate through all modules and set each module's text as RW */
Daniel J Blueman5d05c702011-03-08 22:01:47 +08001743void set_all_modules_text_rw(void)
matthieu castet84e1c6b2010-11-16 22:35:16 +01001744{
1745 struct module *mod;
1746
1747 mutex_lock(&module_mutex);
1748 list_for_each_entry_rcu(mod, &modules, list) {
1749 if ((mod->module_core) && (mod->core_text_size)) {
1750 set_page_attributes(mod->module_core,
1751 mod->module_core + mod->core_text_size,
1752 set_memory_rw);
1753 }
1754 if ((mod->module_init) && (mod->init_text_size)) {
1755 set_page_attributes(mod->module_init,
1756 mod->module_init + mod->init_text_size,
1757 set_memory_rw);
1758 }
1759 }
1760 mutex_unlock(&module_mutex);
1761}
1762
1763/* Iterate through all modules and set each module's text as RO */
Daniel J Blueman5d05c702011-03-08 22:01:47 +08001764void set_all_modules_text_ro(void)
matthieu castet84e1c6b2010-11-16 22:35:16 +01001765{
1766 struct module *mod;
1767
1768 mutex_lock(&module_mutex);
1769 list_for_each_entry_rcu(mod, &modules, list) {
1770 if ((mod->module_core) && (mod->core_text_size)) {
1771 set_page_attributes(mod->module_core,
1772 mod->module_core + mod->core_text_size,
1773 set_memory_ro);
1774 }
1775 if ((mod->module_init) && (mod->init_text_size)) {
1776 set_page_attributes(mod->module_init,
1777 mod->module_init + mod->init_text_size,
1778 set_memory_ro);
1779 }
1780 }
1781 mutex_unlock(&module_mutex);
1782}
1783#else
1784static inline void set_section_ro_nx(void *base, unsigned long text_size, unsigned long ro_size, unsigned long total_size) { }
Jan Glauber01526ed2011-05-19 16:55:26 -06001785static void unset_module_core_ro_nx(struct module *mod) { }
1786static void unset_module_init_ro_nx(struct module *mod) { }
matthieu castet84e1c6b2010-11-16 22:35:16 +01001787#endif
1788
Jonas Bonn74e08fc2011-06-30 21:22:11 +02001789void __weak module_free(struct module *mod, void *module_region)
1790{
1791 vfree(module_region);
1792}
1793
1794void __weak module_arch_cleanup(struct module *mod)
1795{
1796}
1797
Rusty Russell75676502010-06-05 11:17:36 -06001798/* Free a module, remove from lists, etc. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001799static void free_module(struct module *mod)
1800{
Li Zefan7ead8b82009-08-17 16:56:28 +08001801 trace_module_free(mod);
1802
Linus Torvalds1da177e2005-04-16 15:20:36 -07001803 /* Delete from various lists */
Rusty Russell75676502010-06-05 11:17:36 -06001804 mutex_lock(&module_mutex);
Rusty Russell9b1a4d32008-07-28 12:16:30 -05001805 stop_machine(__unlink_module, mod, NULL);
Rusty Russell75676502010-06-05 11:17:36 -06001806 mutex_unlock(&module_mutex);
Rusty Russell36b03602010-08-05 12:59:09 -06001807 mod_sysfs_teardown(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001808
Jason Baronb82bab4b2010-07-27 13:18:01 -07001809 /* Remove dynamic debug info */
1810 ddebug_remove_module(mod->name);
1811
Linus Torvalds1da177e2005-04-16 15:20:36 -07001812 /* Arch-specific cleanup. */
1813 module_arch_cleanup(mod);
1814
1815 /* Module unload stuff */
1816 module_unload_free(mod);
1817
Rusty Russelle180a6b2009-03-31 13:05:29 -06001818 /* Free any allocated parameters. */
1819 destroy_params(mod->kp, mod->num_kp);
1820
Linus Torvalds1da177e2005-04-16 15:20:36 -07001821 /* This may be NULL, but that's OK */
Jan Glauber01526ed2011-05-19 16:55:26 -06001822 unset_module_init_ro_nx(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001823 module_free(mod, mod->module_init);
1824 kfree(mod->args);
Tejun Heo259354d2010-03-10 18:56:10 +09001825 percpu_modfree(mod);
Rusty Russell9f85a4b2010-08-05 12:59:04 -06001826
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001827 /* Free lock-classes: */
1828 lockdep_free_key_range(mod->module_core, mod->core_size);
1829
Linus Torvalds1da177e2005-04-16 15:20:36 -07001830 /* Finally, free the core (containing the module structure) */
Jan Glauber01526ed2011-05-19 16:55:26 -06001831 unset_module_core_ro_nx(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001832 module_free(mod, mod->module_core);
Bernd Schmidteb8cdec2009-09-21 17:03:57 -07001833
1834#ifdef CONFIG_MPU
1835 update_protections(current->mm);
1836#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001837}
1838
1839void *__symbol_get(const char *symbol)
1840{
1841 struct module *owner;
Tim Abbott414fd312008-12-05 19:03:56 -05001842 const struct kernel_symbol *sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001843
Rusty Russell24da1cb2007-07-15 23:41:46 -07001844 preempt_disable();
Tim Abbott414fd312008-12-05 19:03:56 -05001845 sym = find_symbol(symbol, &owner, NULL, true, true);
1846 if (sym && strong_try_module_get(owner))
1847 sym = NULL;
Rusty Russell24da1cb2007-07-15 23:41:46 -07001848 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001849
Tim Abbott414fd312008-12-05 19:03:56 -05001850 return sym ? (void *)sym->value : NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851}
1852EXPORT_SYMBOL_GPL(__symbol_get);
1853
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001854/*
1855 * Ensure that an exported symbol [global namespace] does not already exist
Robert P. J. Day02a3e592007-05-09 07:26:28 +02001856 * in the kernel or in some other module's exported symbol table.
Rusty Russellbe593f42010-06-05 11:17:37 -06001857 *
1858 * You must hold the module_mutex.
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001859 */
1860static int verify_export_symbols(struct module *mod)
1861{
Rusty Russellb2111042008-05-01 21:15:00 -05001862 unsigned int i;
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001863 struct module *owner;
Rusty Russellb2111042008-05-01 21:15:00 -05001864 const struct kernel_symbol *s;
1865 struct {
1866 const struct kernel_symbol *sym;
1867 unsigned int num;
1868 } arr[] = {
1869 { mod->syms, mod->num_syms },
1870 { mod->gpl_syms, mod->num_gpl_syms },
1871 { mod->gpl_future_syms, mod->num_gpl_future_syms },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -05001872#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russellb2111042008-05-01 21:15:00 -05001873 { mod->unused_syms, mod->num_unused_syms },
1874 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -05001875#endif
Rusty Russellb2111042008-05-01 21:15:00 -05001876 };
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001877
Rusty Russellb2111042008-05-01 21:15:00 -05001878 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1879 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
Rusty Russellbe593f42010-06-05 11:17:37 -06001880 if (find_symbol(s->name, &owner, NULL, true, false)) {
Rusty Russellb2111042008-05-01 21:15:00 -05001881 printk(KERN_ERR
1882 "%s: exports duplicate symbol %s"
1883 " (owned by %s)\n",
1884 mod->name, s->name, module_name(owner));
1885 return -ENOEXEC;
1886 }
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001887 }
Rusty Russellb2111042008-05-01 21:15:00 -05001888 }
1889 return 0;
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001890}
1891
Matti Linnanvuori9a4b9702007-11-08 08:37:38 -08001892/* Change all symbols so that st_value encodes the pointer directly. */
Rusty Russell49668682010-08-05 12:59:10 -06001893static int simplify_symbols(struct module *mod, const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894{
Rusty Russell49668682010-08-05 12:59:10 -06001895 Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
1896 Elf_Sym *sym = (void *)symsec->sh_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001897 unsigned long secbase;
Rusty Russell49668682010-08-05 12:59:10 -06001898 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001899 int ret = 0;
Tim Abbott414fd312008-12-05 19:03:56 -05001900 const struct kernel_symbol *ksym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901
Rusty Russell49668682010-08-05 12:59:10 -06001902 for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) {
1903 const char *name = info->strtab + sym[i].st_name;
1904
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905 switch (sym[i].st_shndx) {
1906 case SHN_COMMON:
1907 /* We compiled with -fno-common. These are not
1908 supposed to happen. */
Jim Cromie5e124162011-12-06 12:11:31 -07001909 pr_debug("Common symbol: %s\n", name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001910 printk("%s: please compile with -fno-common\n",
1911 mod->name);
1912 ret = -ENOEXEC;
1913 break;
1914
1915 case SHN_ABS:
1916 /* Don't need to do anything */
Jim Cromie5e124162011-12-06 12:11:31 -07001917 pr_debug("Absolute symbol: 0x%08lx\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918 (long)sym[i].st_value);
1919 break;
1920
1921 case SHN_UNDEF:
Rusty Russell49668682010-08-05 12:59:10 -06001922 ksym = resolve_symbol_wait(mod, info, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001923 /* Ok if resolved. */
Rusty Russell9bea7f22010-06-05 11:17:37 -06001924 if (ksym && !IS_ERR(ksym)) {
Tim Abbott414fd312008-12-05 19:03:56 -05001925 sym[i].st_value = ksym->value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001926 break;
Tim Abbott414fd312008-12-05 19:03:56 -05001927 }
1928
Linus Torvalds1da177e2005-04-16 15:20:36 -07001929 /* Ok if weak. */
Rusty Russell9bea7f22010-06-05 11:17:37 -06001930 if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931 break;
1932
Rusty Russell9bea7f22010-06-05 11:17:37 -06001933 printk(KERN_WARNING "%s: Unknown symbol %s (err %li)\n",
Rusty Russell49668682010-08-05 12:59:10 -06001934 mod->name, name, PTR_ERR(ksym));
Rusty Russell9bea7f22010-06-05 11:17:37 -06001935 ret = PTR_ERR(ksym) ?: -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936 break;
1937
1938 default:
1939 /* Divert to percpu allocation if a percpu var. */
Rusty Russell49668682010-08-05 12:59:10 -06001940 if (sym[i].st_shndx == info->index.pcpu)
Tejun Heo259354d2010-03-10 18:56:10 +09001941 secbase = (unsigned long)mod_percpu(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001942 else
Rusty Russell49668682010-08-05 12:59:10 -06001943 secbase = info->sechdrs[sym[i].st_shndx].sh_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944 sym[i].st_value += secbase;
1945 break;
1946 }
1947 }
1948
1949 return ret;
1950}
1951
Jonas Bonn74e08fc2011-06-30 21:22:11 +02001952int __weak apply_relocate(Elf_Shdr *sechdrs,
1953 const char *strtab,
1954 unsigned int symindex,
1955 unsigned int relsec,
1956 struct module *me)
1957{
1958 pr_err("module %s: REL relocation unsupported\n", me->name);
1959 return -ENOEXEC;
1960}
1961
1962int __weak apply_relocate_add(Elf_Shdr *sechdrs,
1963 const char *strtab,
1964 unsigned int symindex,
1965 unsigned int relsec,
1966 struct module *me)
1967{
1968 pr_err("module %s: RELA relocation unsupported\n", me->name);
1969 return -ENOEXEC;
1970}
1971
Rusty Russell49668682010-08-05 12:59:10 -06001972static int apply_relocations(struct module *mod, const struct load_info *info)
Rusty Russell22e268e2010-08-05 12:59:05 -06001973{
1974 unsigned int i;
1975 int err = 0;
1976
1977 /* Now do relocations. */
Rusty Russell49668682010-08-05 12:59:10 -06001978 for (i = 1; i < info->hdr->e_shnum; i++) {
1979 unsigned int infosec = info->sechdrs[i].sh_info;
Rusty Russell22e268e2010-08-05 12:59:05 -06001980
1981 /* Not a valid relocation section? */
Rusty Russell49668682010-08-05 12:59:10 -06001982 if (infosec >= info->hdr->e_shnum)
Rusty Russell22e268e2010-08-05 12:59:05 -06001983 continue;
1984
1985 /* Don't bother with non-allocated sections */
Rusty Russell49668682010-08-05 12:59:10 -06001986 if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC))
Rusty Russell22e268e2010-08-05 12:59:05 -06001987 continue;
1988
Rusty Russell49668682010-08-05 12:59:10 -06001989 if (info->sechdrs[i].sh_type == SHT_REL)
1990 err = apply_relocate(info->sechdrs, info->strtab,
1991 info->index.sym, i, mod);
1992 else if (info->sechdrs[i].sh_type == SHT_RELA)
1993 err = apply_relocate_add(info->sechdrs, info->strtab,
1994 info->index.sym, i, mod);
Rusty Russell22e268e2010-08-05 12:59:05 -06001995 if (err < 0)
1996 break;
1997 }
1998 return err;
1999}
2000
Helge Deller088af9a2008-12-31 12:31:18 +01002001/* Additional bytes needed by arch in front of individual sections */
2002unsigned int __weak arch_mod_section_prepend(struct module *mod,
2003 unsigned int section)
2004{
2005 /* default implementation just returns zero */
2006 return 0;
2007}
2008
Linus Torvalds1da177e2005-04-16 15:20:36 -07002009/* Update size with this section: return offset. */
Helge Deller088af9a2008-12-31 12:31:18 +01002010static long get_offset(struct module *mod, unsigned int *size,
2011 Elf_Shdr *sechdr, unsigned int section)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002012{
2013 long ret;
2014
Helge Deller088af9a2008-12-31 12:31:18 +01002015 *size += arch_mod_section_prepend(mod, section);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002016 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
2017 *size = ret + sechdr->sh_size;
2018 return ret;
2019}
2020
2021/* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
2022 might -- code, read-only data, read-write data, small data. Tally
2023 sizes, and place the offsets into sh_entsize fields: high bit means it
2024 belongs in init. */
Rusty Russell49668682010-08-05 12:59:10 -06002025static void layout_sections(struct module *mod, struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026{
2027 static unsigned long const masks[][2] = {
2028 /* NOTE: all executable code must be the first section
2029 * in this array; otherwise modify the text_size
2030 * finder in the two loops below */
2031 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
2032 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
2033 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
2034 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
2035 };
2036 unsigned int m, i;
2037
Rusty Russell49668682010-08-05 12:59:10 -06002038 for (i = 0; i < info->hdr->e_shnum; i++)
2039 info->sechdrs[i].sh_entsize = ~0UL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002040
Jim Cromie5e124162011-12-06 12:11:31 -07002041 pr_debug("Core section allocation order:\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002042 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
Rusty Russell49668682010-08-05 12:59:10 -06002043 for (i = 0; i < info->hdr->e_shnum; ++i) {
2044 Elf_Shdr *s = &info->sechdrs[i];
2045 const char *sname = info->secstrings + s->sh_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002046
2047 if ((s->sh_flags & masks[m][0]) != masks[m][0]
2048 || (s->sh_flags & masks[m][1])
2049 || s->sh_entsize != ~0UL
Rusty Russell49668682010-08-05 12:59:10 -06002050 || strstarts(sname, ".init"))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051 continue;
Helge Deller088af9a2008-12-31 12:31:18 +01002052 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
Jim Cromie5e124162011-12-06 12:11:31 -07002053 pr_debug("\t%s\n", sname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002054 }
matthieu castet84e1c6b2010-11-16 22:35:16 +01002055 switch (m) {
2056 case 0: /* executable */
2057 mod->core_size = debug_align(mod->core_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002058 mod->core_text_size = mod->core_size;
matthieu castet84e1c6b2010-11-16 22:35:16 +01002059 break;
2060 case 1: /* RO: text and ro-data */
2061 mod->core_size = debug_align(mod->core_size);
2062 mod->core_ro_size = mod->core_size;
2063 break;
2064 case 3: /* whole core */
2065 mod->core_size = debug_align(mod->core_size);
2066 break;
2067 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002068 }
2069
Jim Cromie5e124162011-12-06 12:11:31 -07002070 pr_debug("Init section allocation order:\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002071 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
Rusty Russell49668682010-08-05 12:59:10 -06002072 for (i = 0; i < info->hdr->e_shnum; ++i) {
2073 Elf_Shdr *s = &info->sechdrs[i];
2074 const char *sname = info->secstrings + s->sh_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075
2076 if ((s->sh_flags & masks[m][0]) != masks[m][0]
2077 || (s->sh_flags & masks[m][1])
2078 || s->sh_entsize != ~0UL
Rusty Russell49668682010-08-05 12:59:10 -06002079 || !strstarts(sname, ".init"))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002080 continue;
Helge Deller088af9a2008-12-31 12:31:18 +01002081 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002082 | INIT_OFFSET_MASK);
Jim Cromie5e124162011-12-06 12:11:31 -07002083 pr_debug("\t%s\n", sname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002084 }
matthieu castet84e1c6b2010-11-16 22:35:16 +01002085 switch (m) {
2086 case 0: /* executable */
2087 mod->init_size = debug_align(mod->init_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002088 mod->init_text_size = mod->init_size;
matthieu castet84e1c6b2010-11-16 22:35:16 +01002089 break;
2090 case 1: /* RO: text and ro-data */
2091 mod->init_size = debug_align(mod->init_size);
2092 mod->init_ro_size = mod->init_size;
2093 break;
2094 case 3: /* whole init */
2095 mod->init_size = debug_align(mod->init_size);
2096 break;
2097 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002098 }
2099}
2100
Linus Torvalds1da177e2005-04-16 15:20:36 -07002101static void set_license(struct module *mod, const char *license)
2102{
2103 if (!license)
2104 license = "unspecified";
2105
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002106 if (!license_is_gpl_compatible(license)) {
Andi Kleen25ddbb12008-10-15 22:01:41 -07002107 if (!test_taint(TAINT_PROPRIETARY_MODULE))
Jan Dittmer1d4d2622006-10-28 10:38:38 -07002108 printk(KERN_WARNING "%s: module license '%s' taints "
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002109 "kernel.\n", mod->name, license);
2110 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002111 }
2112}
2113
2114/* Parse tag=value strings from .modinfo section */
2115static char *next_string(char *string, unsigned long *secsize)
2116{
2117 /* Skip non-zero chars */
2118 while (string[0]) {
2119 string++;
2120 if ((*secsize)-- <= 1)
2121 return NULL;
2122 }
2123
2124 /* Skip any zero padding. */
2125 while (!string[0]) {
2126 string++;
2127 if ((*secsize)-- <= 1)
2128 return NULL;
2129 }
2130 return string;
2131}
2132
Rusty Russell49668682010-08-05 12:59:10 -06002133static char *get_modinfo(struct load_info *info, const char *tag)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002134{
2135 char *p;
2136 unsigned int taglen = strlen(tag);
Rusty Russell49668682010-08-05 12:59:10 -06002137 Elf_Shdr *infosec = &info->sechdrs[info->index.info];
2138 unsigned long size = infosec->sh_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002139
Rusty Russell49668682010-08-05 12:59:10 -06002140 for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002141 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
2142 return p + taglen + 1;
2143 }
2144 return NULL;
2145}
2146
Rusty Russell49668682010-08-05 12:59:10 -06002147static void setup_modinfo(struct module *mod, struct load_info *info)
Matt Domschc988d2b2005-06-23 22:05:15 -07002148{
2149 struct module_attribute *attr;
2150 int i;
2151
2152 for (i = 0; (attr = modinfo_attrs[i]); i++) {
2153 if (attr->setup)
Rusty Russell49668682010-08-05 12:59:10 -06002154 attr->setup(mod, get_modinfo(info, attr->attr.name));
Matt Domschc988d2b2005-06-23 22:05:15 -07002155 }
2156}
Matt Domschc988d2b2005-06-23 22:05:15 -07002157
Rusty Russella263f772009-09-25 00:32:58 -06002158static void free_modinfo(struct module *mod)
2159{
2160 struct module_attribute *attr;
2161 int i;
2162
2163 for (i = 0; (attr = modinfo_attrs[i]); i++) {
2164 if (attr->free)
2165 attr->free(mod);
2166 }
2167}
2168
Linus Torvalds1da177e2005-04-16 15:20:36 -07002169#ifdef CONFIG_KALLSYMS
WANG Cong15bba372008-07-24 15:41:48 +01002170
2171/* lookup symbol in given range of kernel_symbols */
2172static const struct kernel_symbol *lookup_symbol(const char *name,
2173 const struct kernel_symbol *start,
2174 const struct kernel_symbol *stop)
2175{
Alessio Igor Bogani9d634872011-05-18 22:35:59 +02002176 return bsearch(name, start, stop - start,
2177 sizeof(struct kernel_symbol), cmp_name);
WANG Cong15bba372008-07-24 15:41:48 +01002178}
2179
Tim Abbottca4787b2009-01-05 08:40:10 -06002180static int is_exported(const char *name, unsigned long value,
2181 const struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002182{
Tim Abbottca4787b2009-01-05 08:40:10 -06002183 const struct kernel_symbol *ks;
2184 if (!mod)
2185 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
Sam Ravnborg3fd68052006-02-08 21:16:45 +01002186 else
Tim Abbottca4787b2009-01-05 08:40:10 -06002187 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
2188 return ks != NULL && ks->value == value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002189}
2190
2191/* As per nm */
Rusty Russelleded41c2010-08-05 12:59:07 -06002192static char elf_type(const Elf_Sym *sym, const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002193{
Rusty Russelleded41c2010-08-05 12:59:07 -06002194 const Elf_Shdr *sechdrs = info->sechdrs;
2195
Linus Torvalds1da177e2005-04-16 15:20:36 -07002196 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
2197 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
2198 return 'v';
2199 else
2200 return 'w';
2201 }
2202 if (sym->st_shndx == SHN_UNDEF)
2203 return 'U';
2204 if (sym->st_shndx == SHN_ABS)
2205 return 'a';
2206 if (sym->st_shndx >= SHN_LORESERVE)
2207 return '?';
2208 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
2209 return 't';
2210 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
2211 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
2212 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
2213 return 'r';
2214 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
2215 return 'g';
2216 else
2217 return 'd';
2218 }
2219 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
2220 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
2221 return 's';
2222 else
2223 return 'b';
2224 }
Rusty Russelleded41c2010-08-05 12:59:07 -06002225 if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name,
2226 ".debug")) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002227 return 'n';
Rusty Russelleded41c2010-08-05 12:59:07 -06002228 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002229 return '?';
2230}
2231
Jan Beulich4a496222009-07-06 14:50:42 +01002232static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
2233 unsigned int shnum)
2234{
2235 const Elf_Shdr *sec;
2236
2237 if (src->st_shndx == SHN_UNDEF
2238 || src->st_shndx >= shnum
2239 || !src->st_name)
2240 return false;
2241
2242 sec = sechdrs + src->st_shndx;
2243 if (!(sec->sh_flags & SHF_ALLOC)
2244#ifndef CONFIG_KALLSYMS_ALL
2245 || !(sec->sh_flags & SHF_EXECINSTR)
2246#endif
2247 || (sec->sh_entsize & INIT_OFFSET_MASK))
2248 return false;
2249
2250 return true;
2251}
2252
Kevin Cernekee48fd1182012-01-13 09:32:14 +10302253/*
2254 * We only allocate and copy the strings needed by the parts of symtab
2255 * we keep. This is simple, but has the effect of making multiple
2256 * copies of duplicates. We could be more sophisticated, see
2257 * linux-kernel thread starting with
2258 * <73defb5e4bca04a6431392cc341112b1@localhost>.
2259 */
Rusty Russell49668682010-08-05 12:59:10 -06002260static void layout_symtab(struct module *mod, struct load_info *info)
Jan Beulich4a496222009-07-06 14:50:42 +01002261{
Rusty Russell49668682010-08-05 12:59:10 -06002262 Elf_Shdr *symsect = info->sechdrs + info->index.sym;
2263 Elf_Shdr *strsect = info->sechdrs + info->index.str;
Jan Beulich4a496222009-07-06 14:50:42 +01002264 const Elf_Sym *src;
Kevin Cernekee48fd1182012-01-13 09:32:14 +10302265 unsigned int i, nsrc, ndst, strtab_size;
Jan Beulich4a496222009-07-06 14:50:42 +01002266
2267 /* Put symbol section at end of init part of module. */
2268 symsect->sh_flags |= SHF_ALLOC;
2269 symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
Rusty Russell49668682010-08-05 12:59:10 -06002270 info->index.sym) | INIT_OFFSET_MASK;
Jim Cromie5e124162011-12-06 12:11:31 -07002271 pr_debug("\t%s\n", info->secstrings + symsect->sh_name);
Jan Beulich4a496222009-07-06 14:50:42 +01002272
Rusty Russell49668682010-08-05 12:59:10 -06002273 src = (void *)info->hdr + symsect->sh_offset;
Jan Beulich4a496222009-07-06 14:50:42 +01002274 nsrc = symsect->sh_size / sizeof(*src);
Kevin Cernekee70b1e9162011-11-12 19:08:55 -08002275
Kevin Cernekee48fd1182012-01-13 09:32:14 +10302276 /* Compute total space required for the core symbols' strtab. */
2277 for (ndst = i = strtab_size = 1; i < nsrc; ++i, ++src)
Rusty Russell49668682010-08-05 12:59:10 -06002278 if (is_core_symbol(src, info->sechdrs, info->hdr->e_shnum)) {
Kevin Cernekee48fd1182012-01-13 09:32:14 +10302279 strtab_size += strlen(&info->strtab[src->st_name]) + 1;
2280 ndst++;
Jan Beulich554bdfe2009-07-06 14:51:44 +01002281 }
Jan Beulich4a496222009-07-06 14:50:42 +01002282
2283 /* Append room for core symbols at end of core part. */
Rusty Russell49668682010-08-05 12:59:10 -06002284 info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
Kevin Cernekee48fd1182012-01-13 09:32:14 +10302285 info->stroffs = mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym);
2286 mod->core_size += strtab_size;
Jan Beulich4a496222009-07-06 14:50:42 +01002287
Jan Beulich554bdfe2009-07-06 14:51:44 +01002288 /* Put string table section at end of init part of module. */
2289 strsect->sh_flags |= SHF_ALLOC;
2290 strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
Rusty Russell49668682010-08-05 12:59:10 -06002291 info->index.str) | INIT_OFFSET_MASK;
Jim Cromie5e124162011-12-06 12:11:31 -07002292 pr_debug("\t%s\n", info->secstrings + strsect->sh_name);
Jan Beulich4a496222009-07-06 14:50:42 +01002293}
2294
Rusty Russell811d66a2010-08-05 12:59:12 -06002295static void add_kallsyms(struct module *mod, const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002296{
Jan Beulich4a496222009-07-06 14:50:42 +01002297 unsigned int i, ndst;
2298 const Elf_Sym *src;
2299 Elf_Sym *dst;
Jan Beulich554bdfe2009-07-06 14:51:44 +01002300 char *s;
Rusty Russelleded41c2010-08-05 12:59:07 -06002301 Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002302
Rusty Russelleded41c2010-08-05 12:59:07 -06002303 mod->symtab = (void *)symsec->sh_addr;
2304 mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym);
Rusty Russell511ca6a2010-08-05 12:59:08 -06002305 /* Make sure we get permanent strtab: don't use info->strtab. */
2306 mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002307
2308 /* Set types up while we still have access to sections. */
2309 for (i = 0; i < mod->num_symtab; i++)
Rusty Russelleded41c2010-08-05 12:59:07 -06002310 mod->symtab[i].st_info = elf_type(&mod->symtab[i], info);
Jan Beulich4a496222009-07-06 14:50:42 +01002311
Rusty Russelld9131882010-08-05 12:59:08 -06002312 mod->core_symtab = dst = mod->module_core + info->symoffs;
Kevin Cernekee48fd1182012-01-13 09:32:14 +10302313 mod->core_strtab = s = mod->module_core + info->stroffs;
Jan Beulich4a496222009-07-06 14:50:42 +01002314 src = mod->symtab;
2315 *dst = *src;
Kevin Cernekee48fd1182012-01-13 09:32:14 +10302316 *s++ = 0;
Jan Beulich4a496222009-07-06 14:50:42 +01002317 for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) {
Rusty Russelleded41c2010-08-05 12:59:07 -06002318 if (!is_core_symbol(src, info->sechdrs, info->hdr->e_shnum))
Jan Beulich4a496222009-07-06 14:50:42 +01002319 continue;
Kevin Cernekee48fd1182012-01-13 09:32:14 +10302320
Jan Beulich4a496222009-07-06 14:50:42 +01002321 dst[ndst] = *src;
Kevin Cernekee48fd1182012-01-13 09:32:14 +10302322 dst[ndst++].st_name = s - mod->core_strtab;
2323 s += strlcpy(s, &mod->strtab[src->st_name], KSYM_NAME_LEN) + 1;
Jan Beulich4a496222009-07-06 14:50:42 +01002324 }
2325 mod->core_num_syms = ndst;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002326}
2327#else
Rusty Russell49668682010-08-05 12:59:10 -06002328static inline void layout_symtab(struct module *mod, struct load_info *info)
Jan Beulich4a496222009-07-06 14:50:42 +01002329{
2330}
Paul Mundt3ae91c22009-10-01 15:43:54 -07002331
Michał Mirosławabbce902010-09-20 01:58:08 +02002332static void add_kallsyms(struct module *mod, const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002333{
2334}
2335#endif /* CONFIG_KALLSYMS */
2336
Jason Barone9d376f2009-02-05 11:51:38 -05002337static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
Rusty Russell5e458cc2008-10-22 10:00:13 -05002338{
Rusty Russell811d66a2010-08-05 12:59:12 -06002339 if (!debug)
2340 return;
Jason Barone9d376f2009-02-05 11:51:38 -05002341#ifdef CONFIG_DYNAMIC_DEBUG
2342 if (ddebug_add_module(debug, num, debug->modname))
2343 printk(KERN_ERR "dynamic debug error adding module: %s\n",
2344 debug->modname);
2345#endif
Rusty Russell5e458cc2008-10-22 10:00:13 -05002346}
Jason Baron346e15b2008-08-12 16:46:19 -04002347
Yehuda Sadehff49d742010-07-03 13:07:35 +10002348static void dynamic_debug_remove(struct _ddebug *debug)
2349{
2350 if (debug)
2351 ddebug_remove_module(debug->modname);
2352}
2353
Jonas Bonn74e08fc2011-06-30 21:22:11 +02002354void * __weak module_alloc(unsigned long size)
2355{
2356 return size == 0 ? NULL : vmalloc_exec(size);
2357}
2358
Rusty Russell3a642e92008-07-22 19:24:28 -05002359static void *module_alloc_update_bounds(unsigned long size)
2360{
2361 void *ret = module_alloc(size);
2362
2363 if (ret) {
Rusty Russell75676502010-06-05 11:17:36 -06002364 mutex_lock(&module_mutex);
Rusty Russell3a642e92008-07-22 19:24:28 -05002365 /* Update module bounds. */
2366 if ((unsigned long)ret < module_addr_min)
2367 module_addr_min = (unsigned long)ret;
2368 if ((unsigned long)ret + size > module_addr_max)
2369 module_addr_max = (unsigned long)ret + size;
Rusty Russell75676502010-06-05 11:17:36 -06002370 mutex_unlock(&module_mutex);
Rusty Russell3a642e92008-07-22 19:24:28 -05002371 }
2372 return ret;
2373}
2374
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002375#ifdef CONFIG_DEBUG_KMEMLEAK
Rusty Russell49668682010-08-05 12:59:10 -06002376static void kmemleak_load_module(const struct module *mod,
2377 const struct load_info *info)
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002378{
2379 unsigned int i;
2380
2381 /* only scan the sections containing data */
Catalin Marinasc017b4b2009-10-28 13:33:09 +00002382 kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002383
Rusty Russell49668682010-08-05 12:59:10 -06002384 for (i = 1; i < info->hdr->e_shnum; i++) {
2385 const char *name = info->secstrings + info->sechdrs[i].sh_name;
2386 if (!(info->sechdrs[i].sh_flags & SHF_ALLOC))
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002387 continue;
Rusty Russell49668682010-08-05 12:59:10 -06002388 if (!strstarts(name, ".data") && !strstarts(name, ".bss"))
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002389 continue;
2390
Rusty Russell49668682010-08-05 12:59:10 -06002391 kmemleak_scan_area((void *)info->sechdrs[i].sh_addr,
2392 info->sechdrs[i].sh_size, GFP_KERNEL);
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002393 }
2394}
2395#else
Rusty Russell49668682010-08-05 12:59:10 -06002396static inline void kmemleak_load_module(const struct module *mod,
2397 const struct load_info *info)
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002398{
2399}
2400#endif
2401
Rusty Russell6526c532010-08-05 12:59:10 -06002402/* Sets info->hdr and info->len. */
Rusty Russelld9131882010-08-05 12:59:08 -06002403static int copy_and_check(struct load_info *info,
2404 const void __user *umod, unsigned long len,
2405 const char __user *uargs)
Rusty Russell40dd2562010-08-05 12:59:03 -06002406{
2407 int err;
2408 Elf_Ehdr *hdr;
2409
2410 if (len < sizeof(*hdr))
2411 return -ENOEXEC;
2412
2413 /* Suck in entire file: we'll want most of it. */
Sasha Levinf946eeb2012-01-30 23:07:22 -05002414 if ((hdr = vmalloc(len)) == NULL)
Rusty Russell40dd2562010-08-05 12:59:03 -06002415 return -ENOMEM;
2416
2417 if (copy_from_user(hdr, umod, len) != 0) {
2418 err = -EFAULT;
2419 goto free_hdr;
2420 }
2421
2422 /* Sanity checks against insmoding binaries or wrong arch,
2423 weird elf version */
2424 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
2425 || hdr->e_type != ET_REL
2426 || !elf_check_arch(hdr)
2427 || hdr->e_shentsize != sizeof(Elf_Shdr)) {
2428 err = -ENOEXEC;
2429 goto free_hdr;
2430 }
2431
David Howellsef26a5a2012-05-22 15:56:13 +01002432 if (hdr->e_shoff >= len ||
2433 hdr->e_shnum * sizeof(Elf_Shdr) > len - hdr->e_shoff) {
Rusty Russell40dd2562010-08-05 12:59:03 -06002434 err = -ENOEXEC;
2435 goto free_hdr;
2436 }
Rusty Russelld9131882010-08-05 12:59:08 -06002437
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002438 info->hdr = hdr;
2439 info->len = len;
Rusty Russell40dd2562010-08-05 12:59:03 -06002440 return 0;
2441
2442free_hdr:
2443 vfree(hdr);
2444 return err;
2445}
2446
Rusty Russelld9131882010-08-05 12:59:08 -06002447static void free_copy(struct load_info *info)
2448{
Rusty Russelld9131882010-08-05 12:59:08 -06002449 vfree(info->hdr);
2450}
2451
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002452static int rewrite_section_headers(struct load_info *info)
2453{
2454 unsigned int i;
2455
2456 /* This should always be true, but let's be sure. */
2457 info->sechdrs[0].sh_addr = 0;
2458
2459 for (i = 1; i < info->hdr->e_shnum; i++) {
2460 Elf_Shdr *shdr = &info->sechdrs[i];
2461 if (shdr->sh_type != SHT_NOBITS
2462 && info->len < shdr->sh_offset + shdr->sh_size) {
2463 printk(KERN_ERR "Module len %lu truncated\n",
2464 info->len);
2465 return -ENOEXEC;
2466 }
2467
2468 /* Mark all sections sh_addr with their address in the
2469 temporary image. */
2470 shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset;
2471
2472#ifndef CONFIG_MODULE_UNLOAD
2473 /* Don't load .exit sections */
2474 if (strstarts(info->secstrings+shdr->sh_name, ".exit"))
2475 shdr->sh_flags &= ~(unsigned long)SHF_ALLOC;
2476#endif
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002477 }
Rusty Russelld6df72a2010-08-05 12:59:07 -06002478
2479 /* Track but don't keep modinfo and version sections. */
Rusty Russell49668682010-08-05 12:59:10 -06002480 info->index.vers = find_sec(info, "__versions");
2481 info->index.info = find_sec(info, ".modinfo");
Rusty Russelld6df72a2010-08-05 12:59:07 -06002482 info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC;
2483 info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC;
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002484 return 0;
2485}
2486
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002487/*
2488 * Set up our basic convenience variables (pointers to section headers,
2489 * search for module section index etc), and do some basic section
2490 * verification.
2491 *
2492 * Return the temporary module pointer (we'll replace it with the final
2493 * one when we move the module sections around).
2494 */
2495static struct module *setup_load_info(struct load_info *info)
2496{
2497 unsigned int i;
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002498 int err;
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002499 struct module *mod;
2500
2501 /* Set up the convenience variables */
2502 info->sechdrs = (void *)info->hdr + info->hdr->e_shoff;
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002503 info->secstrings = (void *)info->hdr
2504 + info->sechdrs[info->hdr->e_shstrndx].sh_offset;
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002505
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002506 err = rewrite_section_headers(info);
2507 if (err)
2508 return ERR_PTR(err);
2509
2510 /* Find internal symbols and strings. */
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002511 for (i = 1; i < info->hdr->e_shnum; i++) {
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002512 if (info->sechdrs[i].sh_type == SHT_SYMTAB) {
2513 info->index.sym = i;
2514 info->index.str = info->sechdrs[i].sh_link;
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002515 info->strtab = (char *)info->hdr
2516 + info->sechdrs[info->index.str].sh_offset;
2517 break;
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002518 }
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002519 }
2520
Rusty Russell49668682010-08-05 12:59:10 -06002521 info->index.mod = find_sec(info, ".gnu.linkonce.this_module");
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002522 if (!info->index.mod) {
2523 printk(KERN_WARNING "No module found in object\n");
2524 return ERR_PTR(-ENOEXEC);
2525 }
2526 /* This is temporary: point mod into copy of data. */
2527 mod = (void *)info->sechdrs[info->index.mod].sh_addr;
2528
2529 if (info->index.sym == 0) {
2530 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
2531 mod->name);
2532 return ERR_PTR(-ENOEXEC);
2533 }
2534
Rusty Russell49668682010-08-05 12:59:10 -06002535 info->index.pcpu = find_pcpusec(info);
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002536
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002537 /* Check module struct version now, before we try to use module. */
2538 if (!check_modstruct_version(info->sechdrs, info->index.vers, mod))
2539 return ERR_PTR(-ENOEXEC);
2540
2541 return mod;
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002542}
2543
Rusty Russell49668682010-08-05 12:59:10 -06002544static int check_modinfo(struct module *mod, struct load_info *info)
Rusty Russell40dd2562010-08-05 12:59:03 -06002545{
Rusty Russell49668682010-08-05 12:59:10 -06002546 const char *modmagic = get_modinfo(info, "vermagic");
Rusty Russell40dd2562010-08-05 12:59:03 -06002547 int err;
2548
2549 /* This is allowed: modprobe --force will invalidate it. */
2550 if (!modmagic) {
2551 err = try_to_force_load(mod, "bad vermagic");
2552 if (err)
2553 return err;
Rusty Russell49668682010-08-05 12:59:10 -06002554 } else if (!same_magic(modmagic, vermagic, info->index.vers)) {
Rusty Russell40dd2562010-08-05 12:59:03 -06002555 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
2556 mod->name, modmagic, vermagic);
2557 return -ENOEXEC;
2558 }
2559
Ben Hutchings2449b8b2011-10-24 15:12:28 +02002560 if (!get_modinfo(info, "intree"))
2561 add_taint_module(mod, TAINT_OOT_MODULE);
2562
Rusty Russell49668682010-08-05 12:59:10 -06002563 if (get_modinfo(info, "staging")) {
Rusty Russell40dd2562010-08-05 12:59:03 -06002564 add_taint_module(mod, TAINT_CRAP);
2565 printk(KERN_WARNING "%s: module is from the staging directory,"
2566 " the quality is unknown, you have been warned.\n",
2567 mod->name);
2568 }
Rusty Russell22e268e2010-08-05 12:59:05 -06002569
2570 /* Set up license info based on the info section */
Rusty Russell49668682010-08-05 12:59:10 -06002571 set_license(mod, get_modinfo(info, "license"));
Rusty Russell22e268e2010-08-05 12:59:05 -06002572
Rusty Russell40dd2562010-08-05 12:59:03 -06002573 return 0;
2574}
2575
Rusty Russell811d66a2010-08-05 12:59:12 -06002576static void find_module_sections(struct module *mod, struct load_info *info)
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002577{
Rusty Russell49668682010-08-05 12:59:10 -06002578 mod->kp = section_objs(info, "__param",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002579 sizeof(*mod->kp), &mod->num_kp);
Rusty Russell49668682010-08-05 12:59:10 -06002580 mod->syms = section_objs(info, "__ksymtab",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002581 sizeof(*mod->syms), &mod->num_syms);
Rusty Russell49668682010-08-05 12:59:10 -06002582 mod->crcs = section_addr(info, "__kcrctab");
2583 mod->gpl_syms = section_objs(info, "__ksymtab_gpl",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002584 sizeof(*mod->gpl_syms),
2585 &mod->num_gpl_syms);
Rusty Russell49668682010-08-05 12:59:10 -06002586 mod->gpl_crcs = section_addr(info, "__kcrctab_gpl");
2587 mod->gpl_future_syms = section_objs(info,
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002588 "__ksymtab_gpl_future",
2589 sizeof(*mod->gpl_future_syms),
2590 &mod->num_gpl_future_syms);
Rusty Russell49668682010-08-05 12:59:10 -06002591 mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future");
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002592
2593#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russell49668682010-08-05 12:59:10 -06002594 mod->unused_syms = section_objs(info, "__ksymtab_unused",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002595 sizeof(*mod->unused_syms),
2596 &mod->num_unused_syms);
Rusty Russell49668682010-08-05 12:59:10 -06002597 mod->unused_crcs = section_addr(info, "__kcrctab_unused");
2598 mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002599 sizeof(*mod->unused_gpl_syms),
2600 &mod->num_unused_gpl_syms);
Rusty Russell49668682010-08-05 12:59:10 -06002601 mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl");
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002602#endif
2603#ifdef CONFIG_CONSTRUCTORS
Rusty Russell49668682010-08-05 12:59:10 -06002604 mod->ctors = section_objs(info, ".ctors",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002605 sizeof(*mod->ctors), &mod->num_ctors);
2606#endif
2607
2608#ifdef CONFIG_TRACEPOINTS
Mathieu Desnoyers65498642011-01-26 17:26:22 -05002609 mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs",
2610 sizeof(*mod->tracepoints_ptrs),
2611 &mod->num_tracepoints);
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002612#endif
Jason Baronbf5438fc2010-09-17 11:09:00 -04002613#ifdef HAVE_JUMP_LABEL
2614 mod->jump_entries = section_objs(info, "__jump_table",
2615 sizeof(*mod->jump_entries),
2616 &mod->num_jump_entries);
2617#endif
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002618#ifdef CONFIG_EVENT_TRACING
Rusty Russell49668682010-08-05 12:59:10 -06002619 mod->trace_events = section_objs(info, "_ftrace_events",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002620 sizeof(*mod->trace_events),
2621 &mod->num_trace_events);
2622 /*
2623 * This section contains pointers to allocated objects in the trace
2624 * code and not scanning it leads to false positives.
2625 */
2626 kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
2627 mod->num_trace_events, GFP_KERNEL);
2628#endif
Steven Rostedt13b9b6e2010-11-10 22:19:24 -05002629#ifdef CONFIG_TRACING
2630 mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt",
2631 sizeof(*mod->trace_bprintk_fmt_start),
2632 &mod->num_trace_bprintk_fmt);
2633 /*
2634 * This section contains pointers to allocated objects in the trace
2635 * code and not scanning it leads to false positives.
2636 */
2637 kmemleak_scan_area(mod->trace_bprintk_fmt_start,
2638 sizeof(*mod->trace_bprintk_fmt_start) *
2639 mod->num_trace_bprintk_fmt, GFP_KERNEL);
2640#endif
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002641#ifdef CONFIG_FTRACE_MCOUNT_RECORD
2642 /* sechdrs[0].sh_size is always zero */
Rusty Russell49668682010-08-05 12:59:10 -06002643 mod->ftrace_callsites = section_objs(info, "__mcount_loc",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002644 sizeof(*mod->ftrace_callsites),
2645 &mod->num_ftrace_callsites);
2646#endif
Rusty Russell22e268e2010-08-05 12:59:05 -06002647
Rusty Russell811d66a2010-08-05 12:59:12 -06002648 mod->extable = section_objs(info, "__ex_table",
2649 sizeof(*mod->extable), &mod->num_exentries);
2650
Rusty Russell49668682010-08-05 12:59:10 -06002651 if (section_addr(info, "__obsparm"))
Rusty Russell22e268e2010-08-05 12:59:05 -06002652 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2653 mod->name);
Rusty Russell811d66a2010-08-05 12:59:12 -06002654
2655 info->debug = section_objs(info, "__verbose",
2656 sizeof(*info->debug), &info->num_debug);
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002657}
2658
Rusty Russell49668682010-08-05 12:59:10 -06002659static int move_module(struct module *mod, struct load_info *info)
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002660{
2661 int i;
2662 void *ptr;
2663
2664 /* Do the allocs. */
2665 ptr = module_alloc_update_bounds(mod->core_size);
2666 /*
2667 * The pointer to this block is stored in the module structure
2668 * which is inside the block. Just mark it as not being a
2669 * leak.
2670 */
2671 kmemleak_not_leak(ptr);
2672 if (!ptr)
Rusty Russelld9131882010-08-05 12:59:08 -06002673 return -ENOMEM;
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002674
2675 memset(ptr, 0, mod->core_size);
2676 mod->module_core = ptr;
2677
2678 ptr = module_alloc_update_bounds(mod->init_size);
2679 /*
2680 * The pointer to this block is stored in the module structure
2681 * which is inside the block. This block doesn't need to be
2682 * scanned as it contains data and code that will be freed
2683 * after the module is initialized.
2684 */
2685 kmemleak_ignore(ptr);
2686 if (!ptr && mod->init_size) {
2687 module_free(mod, mod->module_core);
Rusty Russelld9131882010-08-05 12:59:08 -06002688 return -ENOMEM;
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002689 }
2690 memset(ptr, 0, mod->init_size);
2691 mod->module_init = ptr;
2692
2693 /* Transfer each section which specifies SHF_ALLOC */
Jim Cromie5e124162011-12-06 12:11:31 -07002694 pr_debug("final section addresses:\n");
Rusty Russell49668682010-08-05 12:59:10 -06002695 for (i = 0; i < info->hdr->e_shnum; i++) {
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002696 void *dest;
Rusty Russell49668682010-08-05 12:59:10 -06002697 Elf_Shdr *shdr = &info->sechdrs[i];
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002698
Rusty Russell49668682010-08-05 12:59:10 -06002699 if (!(shdr->sh_flags & SHF_ALLOC))
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002700 continue;
2701
Rusty Russell49668682010-08-05 12:59:10 -06002702 if (shdr->sh_entsize & INIT_OFFSET_MASK)
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002703 dest = mod->module_init
Rusty Russell49668682010-08-05 12:59:10 -06002704 + (shdr->sh_entsize & ~INIT_OFFSET_MASK);
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002705 else
Rusty Russell49668682010-08-05 12:59:10 -06002706 dest = mod->module_core + shdr->sh_entsize;
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002707
Rusty Russell49668682010-08-05 12:59:10 -06002708 if (shdr->sh_type != SHT_NOBITS)
2709 memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size);
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002710 /* Update sh_addr to point to copy in image. */
Rusty Russell49668682010-08-05 12:59:10 -06002711 shdr->sh_addr = (unsigned long)dest;
Jim Cromie5e124162011-12-06 12:11:31 -07002712 pr_debug("\t0x%lx %s\n",
2713 (long)shdr->sh_addr, info->secstrings + shdr->sh_name);
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002714 }
Rusty Russelld9131882010-08-05 12:59:08 -06002715
2716 return 0;
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002717}
2718
Rusty Russell49668682010-08-05 12:59:10 -06002719static int check_module_license_and_versions(struct module *mod)
Rusty Russell22e268e2010-08-05 12:59:05 -06002720{
2721 /*
2722 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2723 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2724 * using GPL-only symbols it needs.
2725 */
2726 if (strcmp(mod->name, "ndiswrapper") == 0)
2727 add_taint(TAINT_PROPRIETARY_MODULE);
2728
2729 /* driverloader was caught wrongly pretending to be under GPL */
2730 if (strcmp(mod->name, "driverloader") == 0)
2731 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2732
2733#ifdef CONFIG_MODVERSIONS
2734 if ((mod->num_syms && !mod->crcs)
2735 || (mod->num_gpl_syms && !mod->gpl_crcs)
2736 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2737#ifdef CONFIG_UNUSED_SYMBOLS
2738 || (mod->num_unused_syms && !mod->unused_crcs)
2739 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2740#endif
2741 ) {
2742 return try_to_force_load(mod,
2743 "no versions for exported symbols");
2744 }
2745#endif
2746 return 0;
2747}
2748
2749static void flush_module_icache(const struct module *mod)
2750{
2751 mm_segment_t old_fs;
2752
2753 /* flush the icache in correct context */
2754 old_fs = get_fs();
2755 set_fs(KERNEL_DS);
2756
2757 /*
2758 * Flush the instruction cache, since we've played with text.
2759 * Do it before processing of module parameters, so the module
2760 * can provide parameter accessor functions of its own.
2761 */
2762 if (mod->module_init)
2763 flush_icache_range((unsigned long)mod->module_init,
2764 (unsigned long)mod->module_init
2765 + mod->init_size);
2766 flush_icache_range((unsigned long)mod->module_core,
2767 (unsigned long)mod->module_core + mod->core_size);
2768
2769 set_fs(old_fs);
2770}
2771
Jonas Bonn74e08fc2011-06-30 21:22:11 +02002772int __weak module_frob_arch_sections(Elf_Ehdr *hdr,
2773 Elf_Shdr *sechdrs,
2774 char *secstrings,
2775 struct module *mod)
2776{
2777 return 0;
2778}
2779
Rusty Russelld9131882010-08-05 12:59:08 -06002780static struct module *layout_and_allocate(struct load_info *info)
2781{
2782 /* Module within temporary copy. */
2783 struct module *mod;
Rusty Russell49668682010-08-05 12:59:10 -06002784 Elf_Shdr *pcpusec;
Rusty Russelld9131882010-08-05 12:59:08 -06002785 int err;
2786
2787 mod = setup_load_info(info);
2788 if (IS_ERR(mod))
2789 return mod;
2790
Rusty Russell49668682010-08-05 12:59:10 -06002791 err = check_modinfo(mod, info);
Rusty Russelld9131882010-08-05 12:59:08 -06002792 if (err)
2793 return ERR_PTR(err);
2794
2795 /* Allow arches to frob section contents and sizes. */
Rusty Russell49668682010-08-05 12:59:10 -06002796 err = module_frob_arch_sections(info->hdr, info->sechdrs,
2797 info->secstrings, mod);
Rusty Russelld9131882010-08-05 12:59:08 -06002798 if (err < 0)
Rusty Russell6526c532010-08-05 12:59:10 -06002799 goto out;
Rusty Russelld9131882010-08-05 12:59:08 -06002800
Rusty Russell49668682010-08-05 12:59:10 -06002801 pcpusec = &info->sechdrs[info->index.pcpu];
2802 if (pcpusec->sh_size) {
Rusty Russelld9131882010-08-05 12:59:08 -06002803 /* We have a special allocation for this section. */
Rusty Russell49668682010-08-05 12:59:10 -06002804 err = percpu_modalloc(mod,
2805 pcpusec->sh_size, pcpusec->sh_addralign);
Rusty Russelld9131882010-08-05 12:59:08 -06002806 if (err)
Rusty Russell6526c532010-08-05 12:59:10 -06002807 goto out;
Rusty Russell49668682010-08-05 12:59:10 -06002808 pcpusec->sh_flags &= ~(unsigned long)SHF_ALLOC;
Rusty Russelld9131882010-08-05 12:59:08 -06002809 }
2810
2811 /* Determine total sizes, and put offsets in sh_entsize. For now
2812 this is done generically; there doesn't appear to be any
2813 special cases for the architectures. */
Rusty Russell49668682010-08-05 12:59:10 -06002814 layout_sections(mod, info);
Rusty Russell49668682010-08-05 12:59:10 -06002815 layout_symtab(mod, info);
Rusty Russelld9131882010-08-05 12:59:08 -06002816
2817 /* Allocate and move to the final place */
Rusty Russell49668682010-08-05 12:59:10 -06002818 err = move_module(mod, info);
Rusty Russelld9131882010-08-05 12:59:08 -06002819 if (err)
Kevin Cernekee48fd1182012-01-13 09:32:14 +10302820 goto free_percpu;
Rusty Russelld9131882010-08-05 12:59:08 -06002821
2822 /* Module has been copied to its final place now: return it. */
2823 mod = (void *)info->sechdrs[info->index.mod].sh_addr;
Rusty Russell49668682010-08-05 12:59:10 -06002824 kmemleak_load_module(mod, info);
Rusty Russelld9131882010-08-05 12:59:08 -06002825 return mod;
2826
Rusty Russelld9131882010-08-05 12:59:08 -06002827free_percpu:
2828 percpu_modfree(mod);
Rusty Russell6526c532010-08-05 12:59:10 -06002829out:
Rusty Russelld9131882010-08-05 12:59:08 -06002830 return ERR_PTR(err);
2831}
2832
2833/* mod is no longer valid after this! */
2834static void module_deallocate(struct module *mod, struct load_info *info)
2835{
Rusty Russelld9131882010-08-05 12:59:08 -06002836 percpu_modfree(mod);
2837 module_free(mod, mod->module_init);
2838 module_free(mod, mod->module_core);
2839}
2840
Jonas Bonn74e08fc2011-06-30 21:22:11 +02002841int __weak module_finalize(const Elf_Ehdr *hdr,
2842 const Elf_Shdr *sechdrs,
2843 struct module *me)
2844{
2845 return 0;
2846}
2847
Rusty Russell811d66a2010-08-05 12:59:12 -06002848static int post_relocation(struct module *mod, const struct load_info *info)
2849{
Rusty Russell51f3d0f2010-08-05 12:59:13 -06002850 /* Sort exception table now relocations are done. */
Rusty Russell811d66a2010-08-05 12:59:12 -06002851 sort_extable(mod->extable, mod->extable + mod->num_exentries);
2852
2853 /* Copy relocated percpu area over. */
2854 percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr,
2855 info->sechdrs[info->index.pcpu].sh_size);
2856
Rusty Russell51f3d0f2010-08-05 12:59:13 -06002857 /* Setup kallsyms-specific fields. */
Rusty Russell811d66a2010-08-05 12:59:12 -06002858 add_kallsyms(mod, info);
2859
2860 /* Arch-specific module finalizing. */
2861 return module_finalize(info->hdr, info->sechdrs, mod);
2862}
2863
Linus Torvalds1da177e2005-04-16 15:20:36 -07002864/* Allocate and load the module: note that size of section 0 is always
2865 zero, and we rely on this for optional sections. */
Rusty Russell51f3d0f2010-08-05 12:59:13 -06002866static struct module *load_module(void __user *umod,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002867 unsigned long len,
2868 const char __user *uargs)
2869{
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002870 struct load_info info = { NULL, };
Linus Torvalds1da177e2005-04-16 15:20:36 -07002871 struct module *mod;
Rusty Russell40dd2562010-08-05 12:59:03 -06002872 long err;
Paul Mundt3ae91c22009-10-01 15:43:54 -07002873
Jim Cromie5e124162011-12-06 12:11:31 -07002874 pr_debug("load_module: umod=%p, len=%lu, uargs=%p\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002875 umod, len, uargs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002876
Rusty Russelld9131882010-08-05 12:59:08 -06002877 /* Copy in the blobs from userspace, check they are vaguely sane. */
2878 err = copy_and_check(&info, umod, len, uargs);
Rusty Russell40dd2562010-08-05 12:59:03 -06002879 if (err)
2880 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002881
Rusty Russelld9131882010-08-05 12:59:08 -06002882 /* Figure out module layout, and allocate all the memory. */
2883 mod = layout_and_allocate(&info);
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002884 if (IS_ERR(mod)) {
2885 err = PTR_ERR(mod);
Rusty Russelld9131882010-08-05 12:59:08 -06002886 goto free_copy;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002887 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002888
Rusty Russell49668682010-08-05 12:59:10 -06002889 /* Now module is in final location, initialize linked lists, etc. */
Rusty Russell9f85a4b2010-08-05 12:59:04 -06002890 err = module_unload_init(mod);
2891 if (err)
Rusty Russelld9131882010-08-05 12:59:08 -06002892 goto free_module;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002893
Rusty Russell22e268e2010-08-05 12:59:05 -06002894 /* Now we've got everything in the final locations, we can
2895 * find optional sections. */
Rusty Russell49668682010-08-05 12:59:10 -06002896 find_module_sections(mod, &info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002897
Rusty Russell49668682010-08-05 12:59:10 -06002898 err = check_module_license_and_versions(mod);
Rusty Russell22e268e2010-08-05 12:59:05 -06002899 if (err)
2900 goto free_unload;
Dave Jones9841d612006-01-08 01:03:41 -08002901
Matt Domschc988d2b2005-06-23 22:05:15 -07002902 /* Set up MODINFO_ATTR fields */
Rusty Russell49668682010-08-05 12:59:10 -06002903 setup_modinfo(mod, &info);
Matt Domschc988d2b2005-06-23 22:05:15 -07002904
Linus Torvalds1da177e2005-04-16 15:20:36 -07002905 /* Fix up syms, so that st_value is a pointer to location. */
Rusty Russell49668682010-08-05 12:59:10 -06002906 err = simplify_symbols(mod, &info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002907 if (err < 0)
Rusty Russelld9131882010-08-05 12:59:08 -06002908 goto free_modinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002909
Rusty Russell49668682010-08-05 12:59:10 -06002910 err = apply_relocations(mod, &info);
Rusty Russell22e268e2010-08-05 12:59:05 -06002911 if (err < 0)
Rusty Russelld9131882010-08-05 12:59:08 -06002912 goto free_modinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002913
Rusty Russell811d66a2010-08-05 12:59:12 -06002914 err = post_relocation(mod, &info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002915 if (err < 0)
Rusty Russelld9131882010-08-05 12:59:08 -06002916 goto free_modinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002917
Rusty Russell22e268e2010-08-05 12:59:05 -06002918 flush_module_icache(mod);
Thomas Koeller378bac82005-09-06 15:17:11 -07002919
Rusty Russell6526c532010-08-05 12:59:10 -06002920 /* Now copy in args */
2921 mod->args = strndup_user(uargs, ~0UL >> 1);
2922 if (IS_ERR(mod->args)) {
2923 err = PTR_ERR(mod->args);
2924 goto free_arch_cleanup;
2925 }
Rusty Russell8d3b33f2006-03-25 03:07:05 -08002926
Rusty Russell51f3d0f2010-08-05 12:59:13 -06002927 /* Mark state as coming so strong_try_module_get() ignores us. */
Rusty Russelld9131882010-08-05 12:59:08 -06002928 mod->state = MODULE_STATE_COMING;
2929
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002930 /* Now sew it into the lists so we can get lockdep and oops
Lucas De Marchi25985ed2011-03-30 22:57:33 -03002931 * info during argument parsing. No one should access us, since
Andi Kleend72b3752008-08-30 10:09:00 +02002932 * strong_try_module_get() will fail.
2933 * lockdep/oops can run asynchronous, so use the RCU list insertion
2934 * function to insert in a way safe to concurrent readers.
2935 * The mutex protects against concurrent writers.
2936 */
Rusty Russell75676502010-06-05 11:17:36 -06002937 mutex_lock(&module_mutex);
Linus Torvalds3bafeb62010-06-05 11:17:36 -06002938 if (find_module(mod->name)) {
2939 err = -EEXIST;
Rusty Russellbe593f42010-06-05 11:17:37 -06002940 goto unlock;
Linus Torvalds3bafeb62010-06-05 11:17:36 -06002941 }
2942
Rusty Russell811d66a2010-08-05 12:59:12 -06002943 /* This has to be done once we're sure module name is unique. */
Ben Hutchings1cd0d6c2011-11-01 03:59:33 +00002944 dynamic_debug_setup(info.debug, info.num_debug);
Yehuda Sadehff49d742010-07-03 13:07:35 +10002945
Rusty Russellbe593f42010-06-05 11:17:37 -06002946 /* Find duplicate symbols */
2947 err = verify_export_symbols(mod);
2948 if (err < 0)
Yehuda Sadehff49d742010-07-03 13:07:35 +10002949 goto ddebug;
Rusty Russellbe593f42010-06-05 11:17:37 -06002950
Linus Torvalds53363772010-10-05 11:29:27 -07002951 module_bug_finalize(info.hdr, info.sechdrs, mod);
Andi Kleend72b3752008-08-30 10:09:00 +02002952 list_add_rcu(&mod->list, &modules);
Rusty Russell75676502010-06-05 11:17:36 -06002953 mutex_unlock(&module_mutex);
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002954
Rusty Russell51f3d0f2010-08-05 12:59:13 -06002955 /* Module is ready to execute: parsing args may do that. */
Pawel Moll026cee02012-03-26 12:50:51 +10302956 err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp,
Jim Cromieb48420c2012-04-27 14:30:35 -06002957 -32768, 32767, &ddebug_dyndbg_module_param_cb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002958 if (err < 0)
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002959 goto unlink;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002960
Rusty Russell51f3d0f2010-08-05 12:59:13 -06002961 /* Link in to syfs. */
Rusty Russell8f6d0372010-08-05 12:59:09 -06002962 err = mod_sysfs_setup(mod, &info, mod->kp, mod->num_kp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002963 if (err < 0)
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002964 goto unlink;
Rusty Russell80a3d1b2010-06-05 11:17:36 -06002965
Kevin Cernekee48fd1182012-01-13 09:32:14 +10302966 /* Get rid of temporary copy. */
Rusty Russelld9131882010-08-05 12:59:08 -06002967 free_copy(&info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002968
2969 /* Done! */
Rusty Russell51f3d0f2010-08-05 12:59:13 -06002970 trace_module_load(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002971 return mod;
2972
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002973 unlink:
Rusty Russell75676502010-06-05 11:17:36 -06002974 mutex_lock(&module_mutex);
Rusty Russelle91defa2009-03-31 13:05:35 -06002975 /* Unlink carefully: kallsyms could be walking list. */
2976 list_del_rcu(&mod->list);
Linus Torvalds53363772010-10-05 11:29:27 -07002977 module_bug_cleanup(mod);
2978
Yehuda Sadehff49d742010-07-03 13:07:35 +10002979 ddebug:
Ben Hutchings1cd0d6c2011-11-01 03:59:33 +00002980 dynamic_debug_remove(info.debug);
Rusty Russellbe593f42010-06-05 11:17:37 -06002981 unlock:
Rusty Russell75676502010-06-05 11:17:36 -06002982 mutex_unlock(&module_mutex);
Rusty Russelle91defa2009-03-31 13:05:35 -06002983 synchronize_sched();
Rusty Russell6526c532010-08-05 12:59:10 -06002984 kfree(mod->args);
2985 free_arch_cleanup:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002986 module_arch_cleanup(mod);
Rusty Russelld9131882010-08-05 12:59:08 -06002987 free_modinfo:
Rusty Russella263f772009-09-25 00:32:58 -06002988 free_modinfo(mod);
Rusty Russell22e268e2010-08-05 12:59:05 -06002989 free_unload:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002990 module_unload_free(mod);
Rusty Russelld9131882010-08-05 12:59:08 -06002991 free_module:
2992 module_deallocate(mod, &info);
2993 free_copy:
2994 free_copy(&info);
Jayachandran C6fe2e702006-01-06 00:19:54 -08002995 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002996}
2997
Peter Oberparleiterb99b87f2009-06-17 16:28:03 -07002998/* Call module constructors. */
2999static void do_mod_ctors(struct module *mod)
3000{
3001#ifdef CONFIG_CONSTRUCTORS
3002 unsigned long i;
3003
3004 for (i = 0; i < mod->num_ctors; i++)
3005 mod->ctors[i]();
3006#endif
3007}
3008
Linus Torvalds1da177e2005-04-16 15:20:36 -07003009/* This is where the real work happens */
Heiko Carstens17da2bd2009-01-14 14:14:10 +01003010SYSCALL_DEFINE3(init_module, void __user *, umod,
3011 unsigned long, len, const char __user *, uargs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003012{
3013 struct module *mod;
3014 int ret = 0;
3015
3016 /* Must have permission */
Kees Cook3d433212009-04-02 15:49:29 -07003017 if (!capable(CAP_SYS_MODULE) || modules_disabled)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003018 return -EPERM;
3019
Linus Torvalds1da177e2005-04-16 15:20:36 -07003020 /* Do all the hard work */
3021 mod = load_module(umod, len, uargs);
Rusty Russell75676502010-06-05 11:17:36 -06003022 if (IS_ERR(mod))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003023 return PTR_ERR(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003024
Alan Sterne041c682006-03-27 01:16:30 -08003025 blocking_notifier_call_chain(&module_notify_list,
3026 MODULE_STATE_COMING, mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003027
Steven Rostedt94462ad2010-11-29 13:15:42 -05003028 /* Set RO and NX regions for core */
3029 set_section_ro_nx(mod->module_core,
3030 mod->core_text_size,
3031 mod->core_ro_size,
3032 mod->core_size);
3033
3034 /* Set RO and NX regions for init */
3035 set_section_ro_nx(mod->module_init,
3036 mod->init_text_size,
3037 mod->init_ro_size,
3038 mod->init_size);
3039
Peter Oberparleiterb99b87f2009-06-17 16:28:03 -07003040 do_mod_ctors(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003041 /* Start the module */
3042 if (mod->init != NULL)
Arjan van de Ven59f94152008-07-30 12:49:02 -07003043 ret = do_one_initcall(mod->init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003044 if (ret < 0) {
3045 /* Init routine failed: abort. Try to protect us from
3046 buggy refcounters. */
3047 mod->state = MODULE_STATE_GOING;
Paul E. McKenneyfbd568a3e2005-05-01 08:59:04 -07003048 synchronize_sched();
Rusty Russellaf49d922007-10-16 23:26:27 -07003049 module_put(mod);
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +02003050 blocking_notifier_call_chain(&module_notify_list,
3051 MODULE_STATE_GOING, mod);
Rusty Russellaf49d922007-10-16 23:26:27 -07003052 free_module(mod);
Rusty Russellc9a3ba52008-01-29 17:13:18 -05003053 wake_up(&module_wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003054 return ret;
3055 }
Alexey Dobriyane24e2e62008-03-10 11:43:53 -07003056 if (ret > 0) {
Joe Perchesad361c92009-07-06 13:05:40 -07003057 printk(KERN_WARNING
3058"%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
3059"%s: loading module anyway...\n",
Alexey Dobriyane24e2e62008-03-10 11:43:53 -07003060 __func__, mod->name, ret,
3061 __func__);
3062 dump_stack();
3063 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003064
Rusty Russell6c5db222008-03-10 11:43:52 -07003065 /* Now it's a first class citizen! Wake up anyone waiting for it. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003066 mod->state = MODULE_STATE_LIVE;
Rusty Russell6c5db222008-03-10 11:43:52 -07003067 wake_up(&module_wq);
Masami Hiramatsu0deddf42009-01-06 14:41:54 -08003068 blocking_notifier_call_chain(&module_notify_list,
3069 MODULE_STATE_LIVE, mod);
Rusty Russell6c5db222008-03-10 11:43:52 -07003070
Linus Torvaldsd6de2c82009-04-10 12:17:41 -07003071 /* We need to finish all async code before the module init sequence is done */
3072 async_synchronize_full();
3073
Rusty Russell6c5db222008-03-10 11:43:52 -07003074 mutex_lock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003075 /* Drop initial reference. */
3076 module_put(mod);
Rusty Russellad6561d2009-06-12 21:47:03 -06003077 trim_init_extable(mod);
Jan Beulich4a496222009-07-06 14:50:42 +01003078#ifdef CONFIG_KALLSYMS
3079 mod->num_symtab = mod->core_num_syms;
3080 mod->symtab = mod->core_symtab;
Jan Beulich554bdfe2009-07-06 14:51:44 +01003081 mod->strtab = mod->core_strtab;
Jan Beulich4a496222009-07-06 14:50:42 +01003082#endif
Jan Glauber01526ed2011-05-19 16:55:26 -06003083 unset_module_init_ro_nx(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003084 module_free(mod, mod->module_init);
3085 mod->module_init = NULL;
3086 mod->init_size = 0;
Jan Glauber4d103802011-05-19 16:55:25 -06003087 mod->init_ro_size = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003088 mod->init_text_size = 0;
Ashutosh Naik6389a382006-03-23 03:00:46 -08003089 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003090
3091 return 0;
3092}
3093
3094static inline int within(unsigned long addr, void *start, unsigned long size)
3095{
3096 return ((void *)addr >= start && (void *)addr < start + size);
3097}
3098
3099#ifdef CONFIG_KALLSYMS
3100/*
3101 * This ignores the intensely annoying "mapping symbols" found
3102 * in ARM ELF files: $a, $t and $d.
3103 */
3104static inline int is_arm_mapping_symbol(const char *str)
3105{
Daniel Walker22a8bde2007-10-18 03:06:07 -07003106 return str[0] == '$' && strchr("atd", str[1])
Linus Torvalds1da177e2005-04-16 15:20:36 -07003107 && (str[2] == '\0' || str[2] == '.');
3108}
3109
3110static const char *get_ksymbol(struct module *mod,
3111 unsigned long addr,
3112 unsigned long *size,
3113 unsigned long *offset)
3114{
3115 unsigned int i, best = 0;
3116 unsigned long nextval;
3117
3118 /* At worse, next value is at end of module */
Masami Hiramatsua06f6212009-01-06 14:41:49 -08003119 if (within_module_init(addr, mod))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003120 nextval = (unsigned long)mod->module_init+mod->init_text_size;
Daniel Walker22a8bde2007-10-18 03:06:07 -07003121 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07003122 nextval = (unsigned long)mod->module_core+mod->core_text_size;
3123
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003124 /* Scan for closest preceding symbol, and next symbol. (ELF
Daniel Walker22a8bde2007-10-18 03:06:07 -07003125 starts real symbols at 1). */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003126 for (i = 1; i < mod->num_symtab; i++) {
3127 if (mod->symtab[i].st_shndx == SHN_UNDEF)
3128 continue;
3129
3130 /* We ignore unnamed symbols: they're uninformative
3131 * and inserted at a whim. */
3132 if (mod->symtab[i].st_value <= addr
3133 && mod->symtab[i].st_value > mod->symtab[best].st_value
3134 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
3135 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
3136 best = i;
3137 if (mod->symtab[i].st_value > addr
3138 && mod->symtab[i].st_value < nextval
3139 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
3140 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
3141 nextval = mod->symtab[i].st_value;
3142 }
3143
3144 if (!best)
3145 return NULL;
3146
Alexey Dobriyanffb45122007-05-08 00:28:41 -07003147 if (size)
3148 *size = nextval - mod->symtab[best].st_value;
3149 if (offset)
3150 *offset = addr - mod->symtab[best].st_value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003151 return mod->strtab + mod->symtab[best].st_name;
3152}
3153
Rusty Russell6dd06c92008-01-29 17:13:22 -05003154/* For kallsyms to ask for address resolution. NULL means not found. Careful
3155 * not to lock to avoid deadlock on oopses, simply disable preemption. */
Andrew Morton92dfc9d2008-02-08 04:18:43 -08003156const char *module_address_lookup(unsigned long addr,
Rusty Russell6dd06c92008-01-29 17:13:22 -05003157 unsigned long *size,
3158 unsigned long *offset,
3159 char **modname,
3160 char *namebuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003161{
3162 struct module *mod;
Rusty Russellcb2a5202008-01-14 00:55:03 -08003163 const char *ret = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003164
Rusty Russellcb2a5202008-01-14 00:55:03 -08003165 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02003166 list_for_each_entry_rcu(mod, &modules, list) {
Masami Hiramatsua06f6212009-01-06 14:41:49 -08003167 if (within_module_init(addr, mod) ||
3168 within_module_core(addr, mod)) {
Franck Bui-Huuffc50892006-10-03 01:13:48 -07003169 if (modname)
3170 *modname = mod->name;
Rusty Russellcb2a5202008-01-14 00:55:03 -08003171 ret = get_ksymbol(mod, addr, size, offset);
3172 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003173 }
3174 }
Rusty Russell6dd06c92008-01-29 17:13:22 -05003175 /* Make a copy in here where it's safe */
3176 if (ret) {
3177 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
3178 ret = namebuf;
3179 }
Rusty Russellcb2a5202008-01-14 00:55:03 -08003180 preempt_enable();
Andrew Morton92dfc9d2008-02-08 04:18:43 -08003181 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003182}
3183
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07003184int lookup_module_symbol_name(unsigned long addr, char *symname)
3185{
3186 struct module *mod;
3187
Rusty Russellcb2a5202008-01-14 00:55:03 -08003188 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02003189 list_for_each_entry_rcu(mod, &modules, list) {
Masami Hiramatsua06f6212009-01-06 14:41:49 -08003190 if (within_module_init(addr, mod) ||
3191 within_module_core(addr, mod)) {
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07003192 const char *sym;
3193
3194 sym = get_ksymbol(mod, addr, NULL, NULL);
3195 if (!sym)
3196 goto out;
Tejun Heo9281ace2007-07-17 04:03:51 -07003197 strlcpy(symname, sym, KSYM_NAME_LEN);
Rusty Russellcb2a5202008-01-14 00:55:03 -08003198 preempt_enable();
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07003199 return 0;
3200 }
3201 }
3202out:
Rusty Russellcb2a5202008-01-14 00:55:03 -08003203 preempt_enable();
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07003204 return -ERANGE;
3205}
3206
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07003207int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
3208 unsigned long *offset, char *modname, char *name)
3209{
3210 struct module *mod;
3211
Rusty Russellcb2a5202008-01-14 00:55:03 -08003212 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02003213 list_for_each_entry_rcu(mod, &modules, list) {
Masami Hiramatsua06f6212009-01-06 14:41:49 -08003214 if (within_module_init(addr, mod) ||
3215 within_module_core(addr, mod)) {
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07003216 const char *sym;
3217
3218 sym = get_ksymbol(mod, addr, size, offset);
3219 if (!sym)
3220 goto out;
3221 if (modname)
Tejun Heo9281ace2007-07-17 04:03:51 -07003222 strlcpy(modname, mod->name, MODULE_NAME_LEN);
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07003223 if (name)
Tejun Heo9281ace2007-07-17 04:03:51 -07003224 strlcpy(name, sym, KSYM_NAME_LEN);
Rusty Russellcb2a5202008-01-14 00:55:03 -08003225 preempt_enable();
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07003226 return 0;
3227 }
3228 }
3229out:
Rusty Russellcb2a5202008-01-14 00:55:03 -08003230 preempt_enable();
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07003231 return -ERANGE;
3232}
3233
Alexey Dobriyanea078902007-05-08 00:28:39 -07003234int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
3235 char *name, char *module_name, int *exported)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003236{
3237 struct module *mod;
3238
Rusty Russellcb2a5202008-01-14 00:55:03 -08003239 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02003240 list_for_each_entry_rcu(mod, &modules, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003241 if (symnum < mod->num_symtab) {
3242 *value = mod->symtab[symnum].st_value;
3243 *type = mod->symtab[symnum].st_info;
Andreas Gruenbacher098c5ee2006-07-14 00:24:04 -07003244 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
Tejun Heo9281ace2007-07-17 04:03:51 -07003245 KSYM_NAME_LEN);
3246 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
Tim Abbottca4787b2009-01-05 08:40:10 -06003247 *exported = is_exported(name, *value, mod);
Rusty Russellcb2a5202008-01-14 00:55:03 -08003248 preempt_enable();
Alexey Dobriyanea078902007-05-08 00:28:39 -07003249 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003250 }
3251 symnum -= mod->num_symtab;
3252 }
Rusty Russellcb2a5202008-01-14 00:55:03 -08003253 preempt_enable();
Alexey Dobriyanea078902007-05-08 00:28:39 -07003254 return -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003255}
3256
3257static unsigned long mod_find_symname(struct module *mod, const char *name)
3258{
3259 unsigned int i;
3260
3261 for (i = 0; i < mod->num_symtab; i++)
Keith Owens54e8ce42006-02-03 03:03:53 -08003262 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
3263 mod->symtab[i].st_info != 'U')
Linus Torvalds1da177e2005-04-16 15:20:36 -07003264 return mod->symtab[i].st_value;
3265 return 0;
3266}
3267
3268/* Look for this name: can be of form module:name. */
3269unsigned long module_kallsyms_lookup_name(const char *name)
3270{
3271 struct module *mod;
3272 char *colon;
3273 unsigned long ret = 0;
3274
3275 /* Don't lock: we're in enough trouble already. */
Rusty Russellcb2a5202008-01-14 00:55:03 -08003276 preempt_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003277 if ((colon = strchr(name, ':')) != NULL) {
3278 *colon = '\0';
3279 if ((mod = find_module(name)) != NULL)
3280 ret = mod_find_symname(mod, colon+1);
3281 *colon = ':';
3282 } else {
Andi Kleend72b3752008-08-30 10:09:00 +02003283 list_for_each_entry_rcu(mod, &modules, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003284 if ((ret = mod_find_symname(mod, name)) != 0)
3285 break;
3286 }
Rusty Russellcb2a5202008-01-14 00:55:03 -08003287 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003288 return ret;
3289}
Anders Kaseorg75a66612008-12-05 19:03:58 -05003290
3291int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
3292 struct module *, unsigned long),
3293 void *data)
3294{
3295 struct module *mod;
3296 unsigned int i;
3297 int ret;
3298
3299 list_for_each_entry(mod, &modules, list) {
3300 for (i = 0; i < mod->num_symtab; i++) {
3301 ret = fn(data, mod->strtab + mod->symtab[i].st_name,
3302 mod, mod->symtab[i].st_value);
3303 if (ret != 0)
3304 return ret;
3305 }
3306 }
3307 return 0;
3308}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003309#endif /* CONFIG_KALLSYMS */
3310
Arjan van de Ven21aa9282008-01-25 21:08:33 +01003311static char *module_flags(struct module *mod, char *buf)
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003312{
3313 int bx = 0;
3314
Arjan van de Ven21aa9282008-01-25 21:08:33 +01003315 if (mod->taints ||
3316 mod->state == MODULE_STATE_GOING ||
3317 mod->state == MODULE_STATE_COMING) {
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003318 buf[bx++] = '(';
Kay Sieverscca3e702012-01-13 09:32:15 +10303319 bx += module_flags_taint(mod, buf + bx);
Arjan van de Ven21aa9282008-01-25 21:08:33 +01003320 /* Show a - for module-is-being-unloaded */
3321 if (mod->state == MODULE_STATE_GOING)
3322 buf[bx++] = '-';
3323 /* Show a + for module-is-being-loaded */
3324 if (mod->state == MODULE_STATE_COMING)
3325 buf[bx++] = '+';
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003326 buf[bx++] = ')';
3327 }
3328 buf[bx] = '\0';
3329
3330 return buf;
3331}
3332
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +04003333#ifdef CONFIG_PROC_FS
3334/* Called by the /proc file system to return a list of modules. */
3335static void *m_start(struct seq_file *m, loff_t *pos)
3336{
3337 mutex_lock(&module_mutex);
3338 return seq_list_start(&modules, *pos);
3339}
3340
3341static void *m_next(struct seq_file *m, void *p, loff_t *pos)
3342{
3343 return seq_list_next(p, &modules, pos);
3344}
3345
3346static void m_stop(struct seq_file *m, void *p)
3347{
3348 mutex_unlock(&module_mutex);
3349}
3350
Linus Torvalds1da177e2005-04-16 15:20:36 -07003351static int m_show(struct seq_file *m, void *p)
3352{
3353 struct module *mod = list_entry(p, struct module, list);
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003354 char buf[8];
3355
Denys Vlasenko2f0f2a32008-07-22 19:24:27 -05003356 seq_printf(m, "%s %u",
Linus Torvalds1da177e2005-04-16 15:20:36 -07003357 mod->name, mod->init_size + mod->core_size);
3358 print_unload_info(m, mod);
3359
3360 /* Informative for users. */
3361 seq_printf(m, " %s",
3362 mod->state == MODULE_STATE_GOING ? "Unloading":
3363 mod->state == MODULE_STATE_COMING ? "Loading":
3364 "Live");
3365 /* Used by oprofile and other similar tools. */
Kees Cook9f36e2c2011-03-22 16:34:22 -07003366 seq_printf(m, " 0x%pK", mod->module_core);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003367
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003368 /* Taints info */
3369 if (mod->taints)
Arjan van de Ven21aa9282008-01-25 21:08:33 +01003370 seq_printf(m, " %s", module_flags(mod, buf));
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003371
Linus Torvalds1da177e2005-04-16 15:20:36 -07003372 seq_printf(m, "\n");
3373 return 0;
3374}
3375
3376/* Format: modulename size refcount deps address
3377
3378 Where refcount is a number or -, and deps is a comma-separated list
3379 of depends or -.
3380*/
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +04003381static const struct seq_operations modules_op = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003382 .start = m_start,
3383 .next = m_next,
3384 .stop = m_stop,
3385 .show = m_show
3386};
3387
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +04003388static int modules_open(struct inode *inode, struct file *file)
3389{
3390 return seq_open(file, &modules_op);
3391}
3392
3393static const struct file_operations proc_modules_operations = {
3394 .open = modules_open,
3395 .read = seq_read,
3396 .llseek = seq_lseek,
3397 .release = seq_release,
3398};
3399
3400static int __init proc_modules_init(void)
3401{
3402 proc_create("modules", 0, NULL, &proc_modules_operations);
3403 return 0;
3404}
3405module_init(proc_modules_init);
3406#endif
3407
Linus Torvalds1da177e2005-04-16 15:20:36 -07003408/* Given an address, look for it in the module exception tables. */
3409const struct exception_table_entry *search_module_extables(unsigned long addr)
3410{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003411 const struct exception_table_entry *e = NULL;
3412 struct module *mod;
3413
Rusty Russell24da1cb2007-07-15 23:41:46 -07003414 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02003415 list_for_each_entry_rcu(mod, &modules, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003416 if (mod->num_exentries == 0)
3417 continue;
Daniel Walker22a8bde2007-10-18 03:06:07 -07003418
Linus Torvalds1da177e2005-04-16 15:20:36 -07003419 e = search_extable(mod->extable,
3420 mod->extable + mod->num_exentries - 1,
3421 addr);
3422 if (e)
3423 break;
3424 }
Rusty Russell24da1cb2007-07-15 23:41:46 -07003425 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003426
3427 /* Now, if we found one, we are running inside it now, hence
Daniel Walker22a8bde2007-10-18 03:06:07 -07003428 we cannot unload the module, hence no refcnt needed. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003429 return e;
3430}
3431
Ingo Molnar4d435f92006-07-03 00:24:24 -07003432/*
Rusty Russelle6104992009-03-31 13:05:31 -06003433 * is_module_address - is this address inside a module?
3434 * @addr: the address to check.
3435 *
3436 * See is_module_text_address() if you simply want to see if the address
3437 * is code (not data).
Ingo Molnar4d435f92006-07-03 00:24:24 -07003438 */
Rusty Russelle6104992009-03-31 13:05:31 -06003439bool is_module_address(unsigned long addr)
Ingo Molnar4d435f92006-07-03 00:24:24 -07003440{
Rusty Russelle6104992009-03-31 13:05:31 -06003441 bool ret;
Ingo Molnar4d435f92006-07-03 00:24:24 -07003442
Rusty Russell24da1cb2007-07-15 23:41:46 -07003443 preempt_disable();
Rusty Russelle6104992009-03-31 13:05:31 -06003444 ret = __module_address(addr) != NULL;
Rusty Russell24da1cb2007-07-15 23:41:46 -07003445 preempt_enable();
Ingo Molnar4d435f92006-07-03 00:24:24 -07003446
Rusty Russelle6104992009-03-31 13:05:31 -06003447 return ret;
Ingo Molnar4d435f92006-07-03 00:24:24 -07003448}
3449
Rusty Russelle6104992009-03-31 13:05:31 -06003450/*
3451 * __module_address - get the module which contains an address.
3452 * @addr: the address.
3453 *
3454 * Must be called with preempt disabled or module mutex held so that
3455 * module doesn't get freed during this.
3456 */
Linus Torvalds714f83d2009-04-05 11:04:19 -07003457struct module *__module_address(unsigned long addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003458{
3459 struct module *mod;
3460
Rusty Russell3a642e92008-07-22 19:24:28 -05003461 if (addr < module_addr_min || addr > module_addr_max)
3462 return NULL;
3463
Andi Kleend72b3752008-08-30 10:09:00 +02003464 list_for_each_entry_rcu(mod, &modules, list)
Rusty Russelle6104992009-03-31 13:05:31 -06003465 if (within_module_core(addr, mod)
3466 || within_module_init(addr, mod))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003467 return mod;
3468 return NULL;
3469}
Tim Abbottc6b37802008-12-05 19:03:59 -05003470EXPORT_SYMBOL_GPL(__module_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003471
Rusty Russelle6104992009-03-31 13:05:31 -06003472/*
3473 * is_module_text_address - is this address inside module code?
3474 * @addr: the address to check.
3475 *
3476 * See is_module_address() if you simply want to see if the address is
3477 * anywhere in a module. See kernel_text_address() for testing if an
3478 * address corresponds to kernel or module code.
3479 */
3480bool is_module_text_address(unsigned long addr)
3481{
3482 bool ret;
3483
3484 preempt_disable();
3485 ret = __module_text_address(addr) != NULL;
3486 preempt_enable();
3487
3488 return ret;
3489}
3490
3491/*
3492 * __module_text_address - get the module whose code contains an address.
3493 * @addr: the address.
3494 *
3495 * Must be called with preempt disabled or module mutex held so that
3496 * module doesn't get freed during this.
3497 */
3498struct module *__module_text_address(unsigned long addr)
3499{
3500 struct module *mod = __module_address(addr);
3501 if (mod) {
3502 /* Make sure it's within the text section. */
3503 if (!within(addr, mod->module_init, mod->init_text_size)
3504 && !within(addr, mod->module_core, mod->core_text_size))
3505 mod = NULL;
3506 }
3507 return mod;
3508}
Tim Abbottc6b37802008-12-05 19:03:59 -05003509EXPORT_SYMBOL_GPL(__module_text_address);
Rusty Russelle6104992009-03-31 13:05:31 -06003510
Linus Torvalds1da177e2005-04-16 15:20:36 -07003511/* Don't grab lock, we're oopsing. */
3512void print_modules(void)
3513{
3514 struct module *mod;
Randy Dunlap2bc2d612006-10-02 02:17:02 -07003515 char buf[8];
Linus Torvalds1da177e2005-04-16 15:20:36 -07003516
Linus Torvaldsb2311252009-06-16 11:07:14 -07003517 printk(KERN_DEFAULT "Modules linked in:");
Andi Kleend72b3752008-08-30 10:09:00 +02003518 /* Most callers should already have preempt disabled, but make sure */
3519 preempt_disable();
3520 list_for_each_entry_rcu(mod, &modules, list)
Arjan van de Ven21aa9282008-01-25 21:08:33 +01003521 printk(" %s%s", mod->name, module_flags(mod, buf));
Andi Kleend72b3752008-08-30 10:09:00 +02003522 preempt_enable();
Arjan van de Vene14af7e2008-01-25 21:08:33 +01003523 if (last_unloaded_module[0])
3524 printk(" [last unloaded: %s]", last_unloaded_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003525 printk("\n");
3526}
3527
Linus Torvalds1da177e2005-04-16 15:20:36 -07003528#ifdef CONFIG_MODVERSIONS
Rusty Russell8c8ef422009-03-31 13:05:34 -06003529/* Generate the signature for all relevant module structures here.
3530 * If these change, we don't want to try to parse the module. */
3531void module_layout(struct module *mod,
3532 struct modversion_info *ver,
3533 struct kernel_param *kp,
3534 struct kernel_symbol *ks,
Mathieu Desnoyers65498642011-01-26 17:26:22 -05003535 struct tracepoint * const *tp)
Rusty Russell8c8ef422009-03-31 13:05:34 -06003536{
3537}
3538EXPORT_SYMBOL(module_layout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003539#endif