blob: 93342d992f348c816bb18d091851e693695b8931 [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*/
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/module.h>
20#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#if 0
66#define DEBUGP printk
67#else
68#define DEBUGP(fmt , a...)
69#endif
70
71#ifndef ARCH_SHF_SMALL
72#define ARCH_SHF_SMALL 0
73#endif
74
matthieu castet84e1c6b2010-11-16 22:35:16 +010075/*
76 * Modules' sections will be aligned on page boundaries
77 * to ensure complete separation of code and data, but
78 * only when CONFIG_DEBUG_SET_MODULE_RONX=y
79 */
80#ifdef CONFIG_DEBUG_SET_MODULE_RONX
81# define debug_align(X) ALIGN(X, PAGE_SIZE)
82#else
83# define debug_align(X) (X)
84#endif
85
86/*
87 * Given BASE and SIZE this macro calculates the number of pages the
88 * memory regions occupies
89 */
90#define MOD_NUMBER_OF_PAGES(BASE, SIZE) (((SIZE) > 0) ? \
91 (PFN_DOWN((unsigned long)(BASE) + (SIZE) - 1) - \
92 PFN_DOWN((unsigned long)BASE) + 1) \
93 : (0UL))
94
Linus Torvalds1da177e2005-04-16 15:20:36 -070095/* If this is set, the section belongs in the init part of the module */
96#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
97
Rusty Russell75676502010-06-05 11:17:36 -060098/*
99 * Mutex protects:
100 * 1) List of modules (also safely readable with preempt_disable),
101 * 2) module_use links,
102 * 3) module_addr_min/module_addr_max.
Andi Kleend72b3752008-08-30 10:09:00 +0200103 * (delete uses stop_machine/add uses RCU list operations). */
Tim Abbottc6b37802008-12-05 19:03:59 -0500104DEFINE_MUTEX(module_mutex);
105EXPORT_SYMBOL_GPL(module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106static LIST_HEAD(modules);
Jason Wessel67fc4e02010-05-20 21:04:21 -0500107#ifdef CONFIG_KGDB_KDB
108struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
109#endif /* CONFIG_KGDB_KDB */
110
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
Stephen Rothwell19e45292009-04-14 17:27:18 +1000112/* Block module loading/unloading? */
113int modules_disabled = 0;
114
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500115/* Waiting for a module to finish initializing? */
116static DECLARE_WAIT_QUEUE_HEAD(module_wq);
117
Alan Sterne041c682006-03-27 01:16:30 -0800118static BLOCKING_NOTIFIER_HEAD(module_notify_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
Rusty Russell75676502010-06-05 11:17:36 -0600120/* Bounds of module allocation, for speeding __module_address.
121 * Protected by module_mutex. */
Rusty Russell3a642e92008-07-22 19:24:28 -0500122static unsigned long module_addr_min = -1UL, module_addr_max = 0;
123
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124int register_module_notifier(struct notifier_block * nb)
125{
Alan Sterne041c682006-03-27 01:16:30 -0800126 return blocking_notifier_chain_register(&module_notify_list, nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127}
128EXPORT_SYMBOL(register_module_notifier);
129
130int unregister_module_notifier(struct notifier_block * nb)
131{
Alan Sterne041c682006-03-27 01:16:30 -0800132 return blocking_notifier_chain_unregister(&module_notify_list, nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133}
134EXPORT_SYMBOL(unregister_module_notifier);
135
Rusty Russelleded41c2010-08-05 12:59:07 -0600136struct load_info {
137 Elf_Ehdr *hdr;
138 unsigned long len;
139 Elf_Shdr *sechdrs;
Rusty Russell6526c532010-08-05 12:59:10 -0600140 char *secstrings, *strtab;
Rusty Russelld9131882010-08-05 12:59:08 -0600141 unsigned long *strmap;
142 unsigned long symoffs, stroffs;
Rusty Russell811d66a2010-08-05 12:59:12 -0600143 struct _ddebug *debug;
144 unsigned int num_debug;
Rusty Russelleded41c2010-08-05 12:59:07 -0600145 struct {
146 unsigned int sym, str, mod, vers, info, pcpu;
147 } index;
148};
149
Matti Linnanvuori9a4b9702007-11-08 08:37:38 -0800150/* We require a truly strong try_module_get(): 0 means failure due to
151 ongoing or failed initialization etc. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152static inline int strong_try_module_get(struct module *mod)
153{
154 if (mod && mod->state == MODULE_STATE_COMING)
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500155 return -EBUSY;
156 if (try_module_get(mod))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 return 0;
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500158 else
159 return -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160}
161
Florin Malitafa3ba2e82006-10-11 01:21:48 -0700162static inline void add_taint_module(struct module *mod, unsigned flag)
163{
164 add_taint(flag);
Andi Kleen25ddbb12008-10-15 22:01:41 -0700165 mod->taints |= (1U << flag);
Florin Malitafa3ba2e82006-10-11 01:21:48 -0700166}
167
Robert P. J. Day02a3e592007-05-09 07:26:28 +0200168/*
169 * A thread that wants to hold a reference to a module only while it
170 * is running can call this to safely exit. nfsd and lockd use this.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 */
172void __module_put_and_exit(struct module *mod, long code)
173{
174 module_put(mod);
175 do_exit(code);
176}
177EXPORT_SYMBOL(__module_put_and_exit);
Daniel Walker22a8bde2007-10-18 03:06:07 -0700178
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179/* Find a module section: 0 means not found. */
Rusty Russell49668682010-08-05 12:59:10 -0600180static unsigned int find_sec(const struct load_info *info, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181{
182 unsigned int i;
183
Rusty Russell49668682010-08-05 12:59:10 -0600184 for (i = 1; i < info->hdr->e_shnum; i++) {
185 Elf_Shdr *shdr = &info->sechdrs[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 /* Alloc bit cleared means "ignore it." */
Rusty Russell49668682010-08-05 12:59:10 -0600187 if ((shdr->sh_flags & SHF_ALLOC)
188 && strcmp(info->secstrings + shdr->sh_name, name) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 return i;
Rusty Russell49668682010-08-05 12:59:10 -0600190 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 return 0;
192}
193
Rusty Russell5e458cc2008-10-22 10:00:13 -0500194/* Find a module section, or NULL. */
Rusty Russell49668682010-08-05 12:59:10 -0600195static void *section_addr(const struct load_info *info, const char *name)
Rusty Russell5e458cc2008-10-22 10:00:13 -0500196{
197 /* Section 0 has sh_addr 0. */
Rusty Russell49668682010-08-05 12:59:10 -0600198 return (void *)info->sechdrs[find_sec(info, name)].sh_addr;
Rusty Russell5e458cc2008-10-22 10:00:13 -0500199}
200
201/* Find a module section, or NULL. Fill in number of "objects" in section. */
Rusty Russell49668682010-08-05 12:59:10 -0600202static void *section_objs(const struct load_info *info,
Rusty Russell5e458cc2008-10-22 10:00:13 -0500203 const char *name,
204 size_t object_size,
205 unsigned int *num)
206{
Rusty Russell49668682010-08-05 12:59:10 -0600207 unsigned int sec = find_sec(info, name);
Rusty Russell5e458cc2008-10-22 10:00:13 -0500208
209 /* Section 0 has sh_addr 0 and sh_size 0. */
Rusty Russell49668682010-08-05 12:59:10 -0600210 *num = info->sechdrs[sec].sh_size / object_size;
211 return (void *)info->sechdrs[sec].sh_addr;
Rusty Russell5e458cc2008-10-22 10:00:13 -0500212}
213
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214/* Provided by the linker */
215extern const struct kernel_symbol __start___ksymtab[];
216extern const struct kernel_symbol __stop___ksymtab[];
217extern const struct kernel_symbol __start___ksymtab_gpl[];
218extern const struct kernel_symbol __stop___ksymtab_gpl[];
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -0800219extern const struct kernel_symbol __start___ksymtab_gpl_future[];
220extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221extern const unsigned long __start___kcrctab[];
222extern const unsigned long __start___kcrctab_gpl[];
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -0800223extern const unsigned long __start___kcrctab_gpl_future[];
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500224#ifdef CONFIG_UNUSED_SYMBOLS
225extern const struct kernel_symbol __start___ksymtab_unused[];
226extern const struct kernel_symbol __stop___ksymtab_unused[];
227extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
228extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700229extern const unsigned long __start___kcrctab_unused[];
230extern const unsigned long __start___kcrctab_unused_gpl[];
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500231#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
233#ifndef CONFIG_MODVERSIONS
234#define symversion(base, idx) NULL
235#else
Andrew Mortonf83ca9f2006-03-28 01:56:20 -0800236#define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237#endif
238
Rusty Russelldafd0942008-07-22 19:24:25 -0500239static bool each_symbol_in_section(const struct symsearch *arr,
240 unsigned int arrsize,
241 struct module *owner,
242 bool (*fn)(const struct symsearch *syms,
243 struct module *owner,
Rusty Russellde4d8d52011-04-19 21:49:58 +0200244 void *data),
Rusty Russelldafd0942008-07-22 19:24:25 -0500245 void *data)
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100246{
Rusty Russellde4d8d52011-04-19 21:49:58 +0200247 unsigned int j;
Rusty Russelldafd0942008-07-22 19:24:25 -0500248
249 for (j = 0; j < arrsize; j++) {
Rusty Russellde4d8d52011-04-19 21:49:58 +0200250 if (fn(&arr[j], owner, data))
251 return true;
Rusty Russelldafd0942008-07-22 19:24:25 -0500252 }
253
254 return false;
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100255}
256
Rusty Russelldafd0942008-07-22 19:24:25 -0500257/* Returns true as soon as fn returns true, otherwise false. */
Rusty Russellde4d8d52011-04-19 21:49:58 +0200258bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
259 struct module *owner,
260 void *data),
261 void *data)
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700262{
Rusty Russelldafd0942008-07-22 19:24:25 -0500263 struct module *mod;
Linus Torvalds44032e62010-08-05 12:59:05 -0600264 static const struct symsearch arr[] = {
Rusty Russelldafd0942008-07-22 19:24:25 -0500265 { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
266 NOT_GPL_ONLY, false },
267 { __start___ksymtab_gpl, __stop___ksymtab_gpl,
268 __start___kcrctab_gpl,
269 GPL_ONLY, false },
270 { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
271 __start___kcrctab_gpl_future,
272 WILL_BE_GPL_ONLY, false },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500273#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russelldafd0942008-07-22 19:24:25 -0500274 { __start___ksymtab_unused, __stop___ksymtab_unused,
275 __start___kcrctab_unused,
276 NOT_GPL_ONLY, true },
277 { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
278 __start___kcrctab_unused_gpl,
279 GPL_ONLY, true },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500280#endif
Rusty Russelldafd0942008-07-22 19:24:25 -0500281 };
282
283 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
284 return true;
285
Andi Kleend72b3752008-08-30 10:09:00 +0200286 list_for_each_entry_rcu(mod, &modules, list) {
Rusty Russelldafd0942008-07-22 19:24:25 -0500287 struct symsearch arr[] = {
288 { mod->syms, mod->syms + mod->num_syms, mod->crcs,
289 NOT_GPL_ONLY, false },
290 { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
291 mod->gpl_crcs,
292 GPL_ONLY, false },
293 { mod->gpl_future_syms,
294 mod->gpl_future_syms + mod->num_gpl_future_syms,
295 mod->gpl_future_crcs,
296 WILL_BE_GPL_ONLY, false },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500297#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russelldafd0942008-07-22 19:24:25 -0500298 { mod->unused_syms,
299 mod->unused_syms + mod->num_unused_syms,
300 mod->unused_crcs,
301 NOT_GPL_ONLY, true },
302 { mod->unused_gpl_syms,
303 mod->unused_gpl_syms + mod->num_unused_gpl_syms,
304 mod->unused_gpl_crcs,
305 GPL_ONLY, true },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500306#endif
Rusty Russelldafd0942008-07-22 19:24:25 -0500307 };
308
309 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
310 return true;
311 }
312 return false;
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700313}
Rusty Russellde4d8d52011-04-19 21:49:58 +0200314EXPORT_SYMBOL_GPL(each_symbol_section);
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700315
Rusty Russelldafd0942008-07-22 19:24:25 -0500316struct find_symbol_arg {
317 /* Input */
318 const char *name;
319 bool gplok;
320 bool warn;
321
322 /* Output */
323 struct module *owner;
324 const unsigned long *crc;
Tim Abbott414fd312008-12-05 19:03:56 -0500325 const struct kernel_symbol *sym;
Rusty Russelldafd0942008-07-22 19:24:25 -0500326};
327
Rusty Russellde4d8d52011-04-19 21:49:58 +0200328static bool check_symbol(const struct symsearch *syms,
329 struct module *owner,
330 unsigned int symnum, void *data)
Rusty Russellad9546c2008-05-01 21:14:59 -0500331{
Rusty Russelldafd0942008-07-22 19:24:25 -0500332 struct find_symbol_arg *fsa = data;
333
Rusty Russelldafd0942008-07-22 19:24:25 -0500334 if (!fsa->gplok) {
335 if (syms->licence == GPL_ONLY)
336 return false;
337 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
338 printk(KERN_WARNING "Symbol %s is being used "
339 "by a non-GPL module, which will not "
340 "be allowed in the future\n", fsa->name);
341 printk(KERN_WARNING "Please see the file "
342 "Documentation/feature-removal-schedule.txt "
343 "in the kernel source tree for more details.\n");
344 }
345 }
346
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500347#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russelldafd0942008-07-22 19:24:25 -0500348 if (syms->unused && fsa->warn) {
Rusty Russellad9546c2008-05-01 21:14:59 -0500349 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
Rusty Russelldafd0942008-07-22 19:24:25 -0500350 "however this module is using it.\n", fsa->name);
Rusty Russellad9546c2008-05-01 21:14:59 -0500351 printk(KERN_WARNING
352 "This symbol will go away in the future.\n");
353 printk(KERN_WARNING
354 "Please evalute if this is the right api to use and if "
355 "it really is, submit a report the linux kernel "
356 "mailinglist together with submitting your code for "
357 "inclusion.\n");
358 }
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500359#endif
Rusty Russelldafd0942008-07-22 19:24:25 -0500360
361 fsa->owner = owner;
362 fsa->crc = symversion(syms->crcs, symnum);
Tim Abbott414fd312008-12-05 19:03:56 -0500363 fsa->sym = &syms->start[symnum];
Rusty Russellad9546c2008-05-01 21:14:59 -0500364 return true;
365}
366
Alessio Igor Bogani403ed272011-04-20 11:10:52 +0200367static int cmp_name(const void *va, const void *vb)
368{
369 const char *a;
370 const struct kernel_symbol *b;
371 a = va; b = vb;
372 return strcmp(a, b->name);
373}
374
Rusty Russellde4d8d52011-04-19 21:49:58 +0200375static bool find_symbol_in_section(const struct symsearch *syms,
376 struct module *owner,
377 void *data)
378{
379 struct find_symbol_arg *fsa = data;
Alessio Igor Bogani403ed272011-04-20 11:10:52 +0200380 struct kernel_symbol *sym;
Rusty Russellde4d8d52011-04-19 21:49:58 +0200381
Alessio Igor Bogani403ed272011-04-20 11:10:52 +0200382 sym = bsearch(fsa->name, syms->start, syms->stop - syms->start,
383 sizeof(struct kernel_symbol), cmp_name);
384
385 if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data))
386 return true;
387
Rusty Russellde4d8d52011-04-19 21:49:58 +0200388 return false;
389}
390
Tim Abbott414fd312008-12-05 19:03:56 -0500391/* Find a symbol and return it, along with, (optional) crc and
Rusty Russell75676502010-06-05 11:17:36 -0600392 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
Tim Abbottc6b37802008-12-05 19:03:59 -0500393const struct kernel_symbol *find_symbol(const char *name,
394 struct module **owner,
395 const unsigned long **crc,
396 bool gplok,
397 bool warn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398{
Rusty Russelldafd0942008-07-22 19:24:25 -0500399 struct find_symbol_arg fsa;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
Rusty Russelldafd0942008-07-22 19:24:25 -0500401 fsa.name = name;
402 fsa.gplok = gplok;
403 fsa.warn = warn;
404
Rusty Russellde4d8d52011-04-19 21:49:58 +0200405 if (each_symbol_section(find_symbol_in_section, &fsa)) {
Rusty Russellad9546c2008-05-01 21:14:59 -0500406 if (owner)
Rusty Russelldafd0942008-07-22 19:24:25 -0500407 *owner = fsa.owner;
408 if (crc)
409 *crc = fsa.crc;
Tim Abbott414fd312008-12-05 19:03:56 -0500410 return fsa.sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 }
Rusty Russellad9546c2008-05-01 21:14:59 -0500412
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 DEBUGP("Failed to find symbol %s\n", name);
Tim Abbott414fd312008-12-05 19:03:56 -0500414 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415}
Tim Abbottc6b37802008-12-05 19:03:59 -0500416EXPORT_SYMBOL_GPL(find_symbol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418/* Search for module by name: must hold module_mutex. */
Tim Abbottc6b37802008-12-05 19:03:59 -0500419struct module *find_module(const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420{
421 struct module *mod;
422
423 list_for_each_entry(mod, &modules, list) {
424 if (strcmp(mod->name, name) == 0)
425 return mod;
426 }
427 return NULL;
428}
Tim Abbottc6b37802008-12-05 19:03:59 -0500429EXPORT_SYMBOL_GPL(find_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
431#ifdef CONFIG_SMP
Tejun Heofbf59bc2009-02-20 16:29:08 +0900432
Tejun Heo259354d2010-03-10 18:56:10 +0900433static inline void __percpu *mod_percpu(struct module *mod)
Tejun Heofbf59bc2009-02-20 16:29:08 +0900434{
Tejun Heo259354d2010-03-10 18:56:10 +0900435 return mod->percpu;
436}
Tejun Heofbf59bc2009-02-20 16:29:08 +0900437
Tejun Heo259354d2010-03-10 18:56:10 +0900438static int percpu_modalloc(struct module *mod,
439 unsigned long size, unsigned long align)
440{
Tejun Heofbf59bc2009-02-20 16:29:08 +0900441 if (align > PAGE_SIZE) {
442 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
Tejun Heo259354d2010-03-10 18:56:10 +0900443 mod->name, align, PAGE_SIZE);
Tejun Heofbf59bc2009-02-20 16:29:08 +0900444 align = PAGE_SIZE;
445 }
446
Tejun Heo259354d2010-03-10 18:56:10 +0900447 mod->percpu = __alloc_reserved_percpu(size, align);
448 if (!mod->percpu) {
Tejun Heofbf59bc2009-02-20 16:29:08 +0900449 printk(KERN_WARNING
Rusty Russelld9131882010-08-05 12:59:08 -0600450 "%s: Could not allocate %lu bytes percpu data\n",
451 mod->name, size);
Tejun Heo259354d2010-03-10 18:56:10 +0900452 return -ENOMEM;
453 }
454 mod->percpu_size = size;
455 return 0;
Tejun Heofbf59bc2009-02-20 16:29:08 +0900456}
457
Tejun Heo259354d2010-03-10 18:56:10 +0900458static void percpu_modfree(struct module *mod)
Tejun Heofbf59bc2009-02-20 16:29:08 +0900459{
Tejun Heo259354d2010-03-10 18:56:10 +0900460 free_percpu(mod->percpu);
Tejun Heofbf59bc2009-02-20 16:29:08 +0900461}
462
Rusty Russell49668682010-08-05 12:59:10 -0600463static unsigned int find_pcpusec(struct load_info *info)
Tejun Heo6b588c12009-02-20 16:29:07 +0900464{
Rusty Russell49668682010-08-05 12:59:10 -0600465 return find_sec(info, ".data..percpu");
Tejun Heo6b588c12009-02-20 16:29:07 +0900466}
467
Tejun Heo259354d2010-03-10 18:56:10 +0900468static void percpu_modcopy(struct module *mod,
469 const void *from, unsigned long size)
Tejun Heo6b588c12009-02-20 16:29:07 +0900470{
471 int cpu;
472
473 for_each_possible_cpu(cpu)
Tejun Heo259354d2010-03-10 18:56:10 +0900474 memcpy(per_cpu_ptr(mod->percpu, cpu), from, size);
Tejun Heo6b588c12009-02-20 16:29:07 +0900475}
476
Tejun Heo10fad5e2010-03-10 18:57:54 +0900477/**
478 * is_module_percpu_address - test whether address is from module static percpu
479 * @addr: address to test
480 *
481 * Test whether @addr belongs to module static percpu area.
482 *
483 * RETURNS:
484 * %true if @addr is from module static percpu area
485 */
486bool is_module_percpu_address(unsigned long addr)
487{
488 struct module *mod;
489 unsigned int cpu;
490
491 preempt_disable();
492
493 list_for_each_entry_rcu(mod, &modules, list) {
494 if (!mod->percpu_size)
495 continue;
496 for_each_possible_cpu(cpu) {
497 void *start = per_cpu_ptr(mod->percpu, cpu);
498
499 if ((void *)addr >= start &&
500 (void *)addr < start + mod->percpu_size) {
501 preempt_enable();
502 return true;
503 }
504 }
505 }
506
507 preempt_enable();
508 return false;
Daniel Walker22a8bde2007-10-18 03:06:07 -0700509}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510
511#else /* ... !CONFIG_SMP */
Tejun Heo6b588c12009-02-20 16:29:07 +0900512
Tejun Heo259354d2010-03-10 18:56:10 +0900513static inline void __percpu *mod_percpu(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514{
515 return NULL;
516}
Tejun Heo259354d2010-03-10 18:56:10 +0900517static inline int percpu_modalloc(struct module *mod,
518 unsigned long size, unsigned long align)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519{
Tejun Heo259354d2010-03-10 18:56:10 +0900520 return -ENOMEM;
521}
522static inline void percpu_modfree(struct module *mod)
523{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524}
Rusty Russell49668682010-08-05 12:59:10 -0600525static unsigned int find_pcpusec(struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526{
527 return 0;
528}
Tejun Heo259354d2010-03-10 18:56:10 +0900529static inline void percpu_modcopy(struct module *mod,
530 const void *from, unsigned long size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531{
532 /* pcpusec should be 0, and size of that section should be 0. */
533 BUG_ON(size != 0);
534}
Tejun Heo10fad5e2010-03-10 18:57:54 +0900535bool is_module_percpu_address(unsigned long addr)
536{
537 return false;
538}
Tejun Heo6b588c12009-02-20 16:29:07 +0900539
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540#endif /* CONFIG_SMP */
541
Matt Domschc988d2b2005-06-23 22:05:15 -0700542#define MODINFO_ATTR(field) \
543static void setup_modinfo_##field(struct module *mod, const char *s) \
544{ \
545 mod->field = kstrdup(s, GFP_KERNEL); \
546} \
547static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
Kay Sievers4befb022011-07-24 22:06:04 +0930548 struct module_kobject *mk, char *buffer) \
Matt Domschc988d2b2005-06-23 22:05:15 -0700549{ \
Kay Sievers4befb022011-07-24 22:06:04 +0930550 return sprintf(buffer, "%s\n", mk->mod->field); \
Matt Domschc988d2b2005-06-23 22:05:15 -0700551} \
552static int modinfo_##field##_exists(struct module *mod) \
553{ \
554 return mod->field != NULL; \
555} \
556static void free_modinfo_##field(struct module *mod) \
557{ \
Daniel Walker22a8bde2007-10-18 03:06:07 -0700558 kfree(mod->field); \
559 mod->field = NULL; \
Matt Domschc988d2b2005-06-23 22:05:15 -0700560} \
561static struct module_attribute modinfo_##field = { \
Tejun Heo7b595752007-06-14 03:45:17 +0900562 .attr = { .name = __stringify(field), .mode = 0444 }, \
Matt Domschc988d2b2005-06-23 22:05:15 -0700563 .show = show_modinfo_##field, \
564 .setup = setup_modinfo_##field, \
565 .test = modinfo_##field##_exists, \
566 .free = free_modinfo_##field, \
567};
568
569MODINFO_ATTR(version);
570MODINFO_ATTR(srcversion);
571
Arjan van de Vene14af7e2008-01-25 21:08:33 +0100572static char last_unloaded_module[MODULE_NAME_LEN+1];
573
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -0800574#ifdef CONFIG_MODULE_UNLOAD
Steven Rostedteb0c5372010-03-29 14:25:18 -0400575
576EXPORT_TRACEPOINT_SYMBOL(module_get);
577
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578/* Init the unload section of the module. */
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600579static int module_unload_init(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580{
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600581 mod->refptr = alloc_percpu(struct module_ref);
582 if (!mod->refptr)
583 return -ENOMEM;
584
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700585 INIT_LIST_HEAD(&mod->source_list);
586 INIT_LIST_HEAD(&mod->target_list);
Christoph Lametere1783a22010-01-05 15:34:50 +0900587
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 /* Hold reference count during initialization. */
Nick Piggin5fbfb182010-04-01 19:09:40 +1100589 __this_cpu_write(mod->refptr->incs, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 /* Backwards compatibility macros put refcount during init. */
591 mod->waiter = current;
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600592
593 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594}
595
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596/* Does a already use b? */
597static int already_uses(struct module *a, struct module *b)
598{
599 struct module_use *use;
600
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700601 list_for_each_entry(use, &b->source_list, source_list) {
602 if (use->source == a) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 DEBUGP("%s uses %s!\n", a->name, b->name);
604 return 1;
605 }
606 }
607 DEBUGP("%s does not use %s!\n", a->name, b->name);
608 return 0;
609}
610
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700611/*
612 * Module a uses b
613 * - we add 'a' as a "source", 'b' as a "target" of module use
614 * - the module_use is added to the list of 'b' sources (so
615 * 'b' can walk the list to see who sourced them), and of 'a'
616 * targets (so 'a' can see what modules it targets).
617 */
618static int add_module_usage(struct module *a, struct module *b)
619{
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700620 struct module_use *use;
621
622 DEBUGP("Allocating new usage for %s.\n", a->name);
623 use = kmalloc(sizeof(*use), GFP_ATOMIC);
624 if (!use) {
625 printk(KERN_WARNING "%s: out of memory loading\n", a->name);
626 return -ENOMEM;
627 }
628
629 use->source = a;
630 use->target = b;
631 list_add(&use->source_list, &b->source_list);
632 list_add(&use->target_list, &a->target_list);
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700633 return 0;
634}
635
Rusty Russell75676502010-06-05 11:17:36 -0600636/* Module a uses b: caller needs module_mutex() */
Rusty Russell9bea7f22010-06-05 11:17:37 -0600637int ref_module(struct module *a, struct module *b)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638{
Rusty Russellc8e21ce2010-06-05 11:17:35 -0600639 int err;
Kay Sievers270a6c42007-01-18 13:26:15 +0100640
Rusty Russell9bea7f22010-06-05 11:17:37 -0600641 if (b == NULL || already_uses(a, b))
Linus Torvalds218ce732010-05-25 16:48:30 -0700642 return 0;
Linus Torvalds218ce732010-05-25 16:48:30 -0700643
Rusty Russell9bea7f22010-06-05 11:17:37 -0600644 /* If module isn't available, we fail. */
645 err = strong_try_module_get(b);
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500646 if (err)
Rusty Russell9bea7f22010-06-05 11:17:37 -0600647 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700649 err = add_module_usage(a, b);
650 if (err) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 module_put(b);
Rusty Russell9bea7f22010-06-05 11:17:37 -0600652 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 }
Rusty Russell9bea7f22010-06-05 11:17:37 -0600654 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655}
Rusty Russell9bea7f22010-06-05 11:17:37 -0600656EXPORT_SYMBOL_GPL(ref_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657
658/* Clear the unload stuff of the module. */
659static void module_unload_free(struct module *mod)
660{
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700661 struct module_use *use, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662
Rusty Russell75676502010-06-05 11:17:36 -0600663 mutex_lock(&module_mutex);
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700664 list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) {
665 struct module *i = use->target;
666 DEBUGP("%s unusing %s\n", mod->name, i->name);
667 module_put(i);
668 list_del(&use->source_list);
669 list_del(&use->target_list);
670 kfree(use);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 }
Rusty Russell75676502010-06-05 11:17:36 -0600672 mutex_unlock(&module_mutex);
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600673
674 free_percpu(mod->refptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675}
676
677#ifdef CONFIG_MODULE_FORCE_UNLOAD
Akinobu Mitafb169792006-01-08 01:04:29 -0800678static inline int try_force_unload(unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679{
680 int ret = (flags & O_TRUNC);
681 if (ret)
Akinobu Mitafb169792006-01-08 01:04:29 -0800682 add_taint(TAINT_FORCED_RMMOD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 return ret;
684}
685#else
Akinobu Mitafb169792006-01-08 01:04:29 -0800686static inline int try_force_unload(unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687{
688 return 0;
689}
690#endif /* CONFIG_MODULE_FORCE_UNLOAD */
691
692struct stopref
693{
694 struct module *mod;
695 int flags;
696 int *forced;
697};
698
699/* Whole machine is stopped with interrupts off when this runs. */
700static int __try_stop_module(void *_sref)
701{
702 struct stopref *sref = _sref;
703
Rusty Russellda39ba52008-07-22 19:24:25 -0500704 /* If it's not unused, quit unless we're forcing. */
705 if (module_refcount(sref->mod) != 0) {
Akinobu Mitafb169792006-01-08 01:04:29 -0800706 if (!(*sref->forced = try_force_unload(sref->flags)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 return -EWOULDBLOCK;
708 }
709
710 /* Mark it as dying. */
711 sref->mod->state = MODULE_STATE_GOING;
712 return 0;
713}
714
715static int try_stop_module(struct module *mod, int flags, int *forced)
716{
Rusty Russellda39ba52008-07-22 19:24:25 -0500717 if (flags & O_NONBLOCK) {
718 struct stopref sref = { mod, flags, forced };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719
Rusty Russell9b1a4d32008-07-28 12:16:30 -0500720 return stop_machine(__try_stop_module, &sref, NULL);
Rusty Russellda39ba52008-07-22 19:24:25 -0500721 } else {
722 /* We don't need to stop the machine for this. */
723 mod->state = MODULE_STATE_GOING;
724 synchronize_sched();
725 return 0;
726 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727}
728
729unsigned int module_refcount(struct module *mod)
730{
Nick Piggin5fbfb182010-04-01 19:09:40 +1100731 unsigned int incs = 0, decs = 0;
Eric Dumazet720eba32009-02-03 13:31:36 +1030732 int cpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
Eric Dumazet720eba32009-02-03 13:31:36 +1030734 for_each_possible_cpu(cpu)
Nick Piggin5fbfb182010-04-01 19:09:40 +1100735 decs += per_cpu_ptr(mod->refptr, cpu)->decs;
736 /*
737 * ensure the incs are added up after the decs.
738 * module_put ensures incs are visible before decs with smp_wmb.
739 *
740 * This 2-count scheme avoids the situation where the refcount
741 * for CPU0 is read, then CPU0 increments the module refcount,
742 * then CPU1 drops that refcount, then the refcount for CPU1 is
743 * read. We would record a decrement but not its corresponding
744 * increment so we would see a low count (disaster).
745 *
746 * Rare situation? But module_refcount can be preempted, and we
747 * might be tallying up 4096+ CPUs. So it is not impossible.
748 */
749 smp_rmb();
750 for_each_possible_cpu(cpu)
751 incs += per_cpu_ptr(mod->refptr, cpu)->incs;
752 return incs - decs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753}
754EXPORT_SYMBOL(module_refcount);
755
756/* This exists whether we can unload or not */
757static void free_module(struct module *mod);
758
759static void wait_for_zero_refcount(struct module *mod)
760{
Matthew Wilcoxa6550202008-02-26 10:47:18 -0500761 /* Since we might sleep for some time, release the mutex first */
Ashutosh Naik6389a382006-03-23 03:00:46 -0800762 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 for (;;) {
764 DEBUGP("Looking at refcount...\n");
765 set_current_state(TASK_UNINTERRUPTIBLE);
766 if (module_refcount(mod) == 0)
767 break;
768 schedule();
769 }
770 current->state = TASK_RUNNING;
Ashutosh Naik6389a382006-03-23 03:00:46 -0800771 mutex_lock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772}
773
Heiko Carstens17da2bd2009-01-14 14:14:10 +0100774SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
775 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776{
777 struct module *mod;
Greg Kroah-Hartmandfff0a02007-02-23 14:54:57 -0800778 char name[MODULE_NAME_LEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 int ret, forced = 0;
780
Kees Cook3d433212009-04-02 15:49:29 -0700781 if (!capable(CAP_SYS_MODULE) || modules_disabled)
Greg Kroah-Hartmandfff0a02007-02-23 14:54:57 -0800782 return -EPERM;
783
784 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
785 return -EFAULT;
786 name[MODULE_NAME_LEN-1] = '\0';
787
Tejun Heo3fc1f1e2010-05-06 18:49:20 +0200788 if (mutex_lock_interruptible(&module_mutex) != 0)
789 return -EINTR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790
791 mod = find_module(name);
792 if (!mod) {
793 ret = -ENOENT;
794 goto out;
795 }
796
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700797 if (!list_empty(&mod->source_list)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 /* Other modules depend on us: get rid of them first. */
799 ret = -EWOULDBLOCK;
800 goto out;
801 }
802
803 /* Doing init or already dying? */
804 if (mod->state != MODULE_STATE_LIVE) {
805 /* FIXME: if (force), slam module count and wake up
806 waiter --RR */
807 DEBUGP("%s already dying\n", mod->name);
808 ret = -EBUSY;
809 goto out;
810 }
811
812 /* If it has an init func, it must have an exit func to unload */
Rusty Russellaf49d922007-10-16 23:26:27 -0700813 if (mod->init && !mod->exit) {
Akinobu Mitafb169792006-01-08 01:04:29 -0800814 forced = try_force_unload(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 if (!forced) {
816 /* This module can't be removed */
817 ret = -EBUSY;
818 goto out;
819 }
820 }
821
822 /* Set this up before setting mod->state */
823 mod->waiter = current;
824
825 /* Stop the machine so refcounts can't move and disable module. */
826 ret = try_stop_module(mod, flags, &forced);
827 if (ret != 0)
828 goto out;
829
830 /* Never wait if forced. */
831 if (!forced && module_refcount(mod) != 0)
832 wait_for_zero_refcount(mod);
833
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +0200834 mutex_unlock(&module_mutex);
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300835 /* Final destruction now no one is using it. */
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +0200836 if (mod->exit != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 mod->exit();
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +0200838 blocking_notifier_call_chain(&module_notify_list,
839 MODULE_STATE_GOING, mod);
Arjan van de Ven22a9d642009-01-07 08:45:46 -0800840 async_synchronize_full();
Rusty Russell75676502010-06-05 11:17:36 -0600841
Arjan van de Vene14af7e2008-01-25 21:08:33 +0100842 /* Store the name of the last unloaded module for diagnostic purposes */
Rusty Russellefa53452008-01-29 17:13:20 -0500843 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844
Rusty Russell75676502010-06-05 11:17:36 -0600845 free_module(mod);
846 return 0;
847out:
Ashutosh Naik6389a382006-03-23 03:00:46 -0800848 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 return ret;
850}
851
Jianjun Kongd1e99d72008-12-08 14:26:29 +0800852static inline void print_unload_info(struct seq_file *m, struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853{
854 struct module_use *use;
855 int printed_something = 0;
856
857 seq_printf(m, " %u ", module_refcount(mod));
858
859 /* Always include a trailing , so userspace can differentiate
860 between this and the old multi-field proc format. */
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700861 list_for_each_entry(use, &mod->source_list, source_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 printed_something = 1;
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700863 seq_printf(m, "%s,", use->source->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 }
865
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 if (mod->init != NULL && mod->exit == NULL) {
867 printed_something = 1;
868 seq_printf(m, "[permanent],");
869 }
870
871 if (!printed_something)
872 seq_printf(m, "-");
873}
874
875void __symbol_put(const char *symbol)
876{
877 struct module *owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878
Rusty Russell24da1cb2007-07-15 23:41:46 -0700879 preempt_disable();
Tim Abbott414fd312008-12-05 19:03:56 -0500880 if (!find_symbol(symbol, &owner, NULL, true, false))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 BUG();
882 module_put(owner);
Rusty Russell24da1cb2007-07-15 23:41:46 -0700883 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884}
885EXPORT_SYMBOL(__symbol_put);
886
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930887/* Note this assumes addr is a function, which it currently always is. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888void symbol_put_addr(void *addr)
889{
Trent Piepho5e376612006-05-15 09:44:06 -0700890 struct module *modaddr;
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930891 unsigned long a = (unsigned long)dereference_function_descriptor(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930893 if (core_kernel_text(a))
Trent Piepho5e376612006-05-15 09:44:06 -0700894 return;
895
Rusty Russella6e6abd2009-03-31 13:05:31 -0600896 /* module_text_address is safe here: we're supposed to have reference
897 * to module from symbol_get, so it can't go away. */
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930898 modaddr = __module_text_address(a);
Rusty Russella6e6abd2009-03-31 13:05:31 -0600899 BUG_ON(!modaddr);
Trent Piepho5e376612006-05-15 09:44:06 -0700900 module_put(modaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901}
902EXPORT_SYMBOL_GPL(symbol_put_addr);
903
904static ssize_t show_refcnt(struct module_attribute *mattr,
Kay Sievers4befb022011-07-24 22:06:04 +0930905 struct module_kobject *mk, char *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906{
Kay Sievers4befb022011-07-24 22:06:04 +0930907 return sprintf(buffer, "%u\n", module_refcount(mk->mod));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908}
909
910static struct module_attribute refcnt = {
Tejun Heo7b595752007-06-14 03:45:17 +0900911 .attr = { .name = "refcnt", .mode = 0444 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 .show = show_refcnt,
913};
914
Al Virof6a57032006-10-18 01:47:25 -0400915void module_put(struct module *module)
916{
917 if (module) {
Christoph Lametere1783a22010-01-05 15:34:50 +0900918 preempt_disable();
Nick Piggin5fbfb182010-04-01 19:09:40 +1100919 smp_wmb(); /* see comment in module_refcount */
920 __this_cpu_inc(module->refptr->decs);
Christoph Lametere1783a22010-01-05 15:34:50 +0900921
Li Zefanae832d12010-03-24 10:57:43 +0800922 trace_module_put(module, _RET_IP_);
Al Virof6a57032006-10-18 01:47:25 -0400923 /* Maybe they're waiting for us to drop reference? */
924 if (unlikely(!module_is_live(module)))
925 wake_up_process(module->waiter);
Christoph Lametere1783a22010-01-05 15:34:50 +0900926 preempt_enable();
Al Virof6a57032006-10-18 01:47:25 -0400927 }
928}
929EXPORT_SYMBOL(module_put);
930
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931#else /* !CONFIG_MODULE_UNLOAD */
Jianjun Kongd1e99d72008-12-08 14:26:29 +0800932static inline void print_unload_info(struct seq_file *m, struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933{
934 /* We don't know the usage count, or what modules are using. */
935 seq_printf(m, " - -");
936}
937
938static inline void module_unload_free(struct module *mod)
939{
940}
941
Rusty Russell9bea7f22010-06-05 11:17:37 -0600942int ref_module(struct module *a, struct module *b)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943{
Rusty Russell9bea7f22010-06-05 11:17:37 -0600944 return strong_try_module_get(b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945}
Rusty Russell9bea7f22010-06-05 11:17:37 -0600946EXPORT_SYMBOL_GPL(ref_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600948static inline int module_unload_init(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949{
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600950 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951}
952#endif /* CONFIG_MODULE_UNLOAD */
953
Kay Sievers1f717402006-11-24 12:15:25 +0100954static ssize_t show_initstate(struct module_attribute *mattr,
Kay Sievers4befb022011-07-24 22:06:04 +0930955 struct module_kobject *mk, char *buffer)
Kay Sievers1f717402006-11-24 12:15:25 +0100956{
957 const char *state = "unknown";
958
Kay Sievers4befb022011-07-24 22:06:04 +0930959 switch (mk->mod->state) {
Kay Sievers1f717402006-11-24 12:15:25 +0100960 case MODULE_STATE_LIVE:
961 state = "live";
962 break;
963 case MODULE_STATE_COMING:
964 state = "coming";
965 break;
966 case MODULE_STATE_GOING:
967 state = "going";
968 break;
969 }
970 return sprintf(buffer, "%s\n", state);
971}
972
973static struct module_attribute initstate = {
Tejun Heo7b595752007-06-14 03:45:17 +0900974 .attr = { .name = "initstate", .mode = 0444 },
Kay Sievers1f717402006-11-24 12:15:25 +0100975 .show = show_initstate,
976};
977
Kay Sievers88bfa322011-07-24 22:06:04 +0930978static ssize_t store_uevent(struct module_attribute *mattr,
979 struct module_kobject *mk,
980 const char *buffer, size_t count)
981{
982 enum kobject_action action;
983
984 if (kobject_action_type(buffer, count, &action) == 0)
985 kobject_uevent(&mk->kobj, action);
986 return count;
987}
988
989struct module_attribute module_uevent = {
990 .attr = { .name = "uevent", .mode = 0200 },
991 .store = store_uevent,
992};
993
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -0800994static struct module_attribute *modinfo_attrs[] = {
995 &modinfo_version,
996 &modinfo_srcversion,
Kay Sievers1f717402006-11-24 12:15:25 +0100997 &initstate,
Kay Sievers88bfa322011-07-24 22:06:04 +0930998 &module_uevent,
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -0800999#ifdef CONFIG_MODULE_UNLOAD
1000 &refcnt,
1001#endif
1002 NULL,
1003};
1004
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005static const char vermagic[] = VERMAGIC_STRING;
1006
Rusty Russellc6e665c2009-03-31 13:05:33 -06001007static int try_to_force_load(struct module *mod, const char *reason)
Linus Torvalds826e4502008-05-04 17:04:16 -07001008{
1009#ifdef CONFIG_MODULE_FORCE_LOAD
Andi Kleen25ddbb12008-10-15 22:01:41 -07001010 if (!test_taint(TAINT_FORCED_MODULE))
Rusty Russellc6e665c2009-03-31 13:05:33 -06001011 printk(KERN_WARNING "%s: %s: kernel tainted.\n",
1012 mod->name, reason);
Linus Torvalds826e4502008-05-04 17:04:16 -07001013 add_taint_module(mod, TAINT_FORCED_MODULE);
1014 return 0;
1015#else
1016 return -ENOEXEC;
1017#endif
1018}
1019
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020#ifdef CONFIG_MODVERSIONS
Rusty Russelld4703ae2009-12-15 16:28:32 -06001021/* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
1022static unsigned long maybe_relocated(unsigned long crc,
1023 const struct module *crc_owner)
1024{
1025#ifdef ARCH_RELOCATES_KCRCTAB
1026 if (crc_owner == NULL)
1027 return crc - (unsigned long)reloc_start;
1028#endif
1029 return crc;
1030}
1031
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032static int check_version(Elf_Shdr *sechdrs,
1033 unsigned int versindex,
1034 const char *symname,
1035 struct module *mod,
Rusty Russelld4703ae2009-12-15 16:28:32 -06001036 const unsigned long *crc,
1037 const struct module *crc_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038{
1039 unsigned int i, num_versions;
1040 struct modversion_info *versions;
1041
1042 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1043 if (!crc)
1044 return 1;
1045
Rusty Russella5dd6972008-05-09 16:24:21 +10001046 /* No versions at all? modprobe --force does this. */
1047 if (versindex == 0)
1048 return try_to_force_load(mod, symname) == 0;
1049
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 versions = (void *) sechdrs[versindex].sh_addr;
1051 num_versions = sechdrs[versindex].sh_size
1052 / sizeof(struct modversion_info);
1053
1054 for (i = 0; i < num_versions; i++) {
1055 if (strcmp(versions[i].name, symname) != 0)
1056 continue;
1057
Rusty Russelld4703ae2009-12-15 16:28:32 -06001058 if (versions[i].crc == maybe_relocated(*crc, crc_owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 DEBUGP("Found checksum %lX vs module %lX\n",
Rusty Russelld4703ae2009-12-15 16:28:32 -06001061 maybe_relocated(*crc, crc_owner), versions[i].crc);
Linus Torvalds826e4502008-05-04 17:04:16 -07001062 goto bad_version;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 }
Linus Torvalds826e4502008-05-04 17:04:16 -07001064
Rusty Russella5dd6972008-05-09 16:24:21 +10001065 printk(KERN_WARNING "%s: no symbol version for %s\n",
1066 mod->name, symname);
1067 return 0;
Linus Torvalds826e4502008-05-04 17:04:16 -07001068
1069bad_version:
1070 printk("%s: disagrees about version of symbol %s\n",
1071 mod->name, symname);
1072 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073}
1074
1075static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1076 unsigned int versindex,
1077 struct module *mod)
1078{
1079 const unsigned long *crc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080
Rusty Russell75676502010-06-05 11:17:36 -06001081 /* Since this should be found in kernel (which can't be removed),
1082 * no locking is necessary. */
Mike Frysinger6560dc12009-07-23 23:42:08 +09301083 if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL,
1084 &crc, true, false))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 BUG();
Rusty Russelld4703ae2009-12-15 16:28:32 -06001086 return check_version(sechdrs, versindex, "module_layout", mod, crc,
1087 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088}
1089
Rusty Russell91e37a72008-05-09 16:25:28 +10001090/* First part is kernel version, which we ignore if module has crcs. */
1091static inline int same_magic(const char *amagic, const char *bmagic,
1092 bool has_crcs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093{
Rusty Russell91e37a72008-05-09 16:25:28 +10001094 if (has_crcs) {
1095 amagic += strcspn(amagic, " ");
1096 bmagic += strcspn(bmagic, " ");
1097 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098 return strcmp(amagic, bmagic) == 0;
1099}
1100#else
1101static inline int check_version(Elf_Shdr *sechdrs,
1102 unsigned int versindex,
1103 const char *symname,
1104 struct module *mod,
Rusty Russelld4703ae2009-12-15 16:28:32 -06001105 const unsigned long *crc,
1106 const struct module *crc_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107{
1108 return 1;
1109}
1110
1111static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1112 unsigned int versindex,
1113 struct module *mod)
1114{
1115 return 1;
1116}
1117
Rusty Russell91e37a72008-05-09 16:25:28 +10001118static inline int same_magic(const char *amagic, const char *bmagic,
1119 bool has_crcs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120{
1121 return strcmp(amagic, bmagic) == 0;
1122}
1123#endif /* CONFIG_MODVERSIONS */
1124
Rusty Russell75676502010-06-05 11:17:36 -06001125/* Resolve a symbol for this module. I.e. if we find one, record usage. */
Rusty Russell49668682010-08-05 12:59:10 -06001126static const struct kernel_symbol *resolve_symbol(struct module *mod,
1127 const struct load_info *info,
Tim Abbott414fd312008-12-05 19:03:56 -05001128 const char *name,
Rusty Russell9bea7f22010-06-05 11:17:37 -06001129 char ownername[])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130{
1131 struct module *owner;
Tim Abbott414fd312008-12-05 19:03:56 -05001132 const struct kernel_symbol *sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 const unsigned long *crc;
Rusty Russell9bea7f22010-06-05 11:17:37 -06001134 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135
Rusty Russell75676502010-06-05 11:17:36 -06001136 mutex_lock(&module_mutex);
Tim Abbott414fd312008-12-05 19:03:56 -05001137 sym = find_symbol(name, &owner, &crc,
Andi Kleen25ddbb12008-10-15 22:01:41 -07001138 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
Rusty Russell9bea7f22010-06-05 11:17:37 -06001139 if (!sym)
1140 goto unlock;
1141
Rusty Russell49668682010-08-05 12:59:10 -06001142 if (!check_version(info->sechdrs, info->index.vers, name, mod, crc,
1143 owner)) {
Rusty Russell9bea7f22010-06-05 11:17:37 -06001144 sym = ERR_PTR(-EINVAL);
1145 goto getname;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 }
Rusty Russell9bea7f22010-06-05 11:17:37 -06001147
1148 err = ref_module(mod, owner);
1149 if (err) {
1150 sym = ERR_PTR(err);
1151 goto getname;
1152 }
1153
1154getname:
1155 /* We must make copy under the lock if we failed to get ref. */
1156 strncpy(ownername, module_name(owner), MODULE_NAME_LEN);
1157unlock:
Rusty Russell75676502010-06-05 11:17:36 -06001158 mutex_unlock(&module_mutex);
Linus Torvalds218ce732010-05-25 16:48:30 -07001159 return sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160}
1161
Rusty Russell49668682010-08-05 12:59:10 -06001162static const struct kernel_symbol *
1163resolve_symbol_wait(struct module *mod,
1164 const struct load_info *info,
1165 const char *name)
Rusty Russell9bea7f22010-06-05 11:17:37 -06001166{
1167 const struct kernel_symbol *ksym;
Rusty Russell49668682010-08-05 12:59:10 -06001168 char owner[MODULE_NAME_LEN];
Rusty Russell9bea7f22010-06-05 11:17:37 -06001169
1170 if (wait_event_interruptible_timeout(module_wq,
Rusty Russell49668682010-08-05 12:59:10 -06001171 !IS_ERR(ksym = resolve_symbol(mod, info, name, owner))
1172 || PTR_ERR(ksym) != -EBUSY,
Rusty Russell9bea7f22010-06-05 11:17:37 -06001173 30 * HZ) <= 0) {
1174 printk(KERN_WARNING "%s: gave up waiting for init of module %s.\n",
Rusty Russell49668682010-08-05 12:59:10 -06001175 mod->name, owner);
Rusty Russell9bea7f22010-06-05 11:17:37 -06001176 }
1177 return ksym;
1178}
1179
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180/*
1181 * /sys/module/foo/sections stuff
1182 * J. Corbet <corbet@lwn.net>
1183 */
Rusty Russell8f6d0372010-08-05 12:59:09 -06001184#ifdef CONFIG_SYSFS
Ben Hutchings10b465a2009-12-19 14:43:01 +00001185
Rusty Russell8f6d0372010-08-05 12:59:09 -06001186#ifdef CONFIG_KALLSYMS
Ben Hutchings10b465a2009-12-19 14:43:01 +00001187static inline bool sect_empty(const Elf_Shdr *sect)
1188{
1189 return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
1190}
1191
Rusty Russella58730c2008-03-13 09:03:44 +00001192struct module_sect_attr
1193{
1194 struct module_attribute mattr;
1195 char *name;
1196 unsigned long address;
1197};
1198
1199struct module_sect_attrs
1200{
1201 struct attribute_group grp;
1202 unsigned int nsections;
1203 struct module_sect_attr attrs[0];
1204};
1205
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206static ssize_t module_sect_show(struct module_attribute *mattr,
Kay Sievers4befb022011-07-24 22:06:04 +09301207 struct module_kobject *mk, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208{
1209 struct module_sect_attr *sattr =
1210 container_of(mattr, struct module_sect_attr, mattr);
Kees Cook9f36e2c2011-03-22 16:34:22 -07001211 return sprintf(buf, "0x%pK\n", (void *)sattr->address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212}
1213
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001214static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1215{
Rusty Russella58730c2008-03-13 09:03:44 +00001216 unsigned int section;
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001217
1218 for (section = 0; section < sect_attrs->nsections; section++)
1219 kfree(sect_attrs->attrs[section].name);
1220 kfree(sect_attrs);
1221}
1222
Rusty Russell8f6d0372010-08-05 12:59:09 -06001223static void add_sect_attrs(struct module *mod, const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224{
1225 unsigned int nloaded = 0, i, size[2];
1226 struct module_sect_attrs *sect_attrs;
1227 struct module_sect_attr *sattr;
1228 struct attribute **gattr;
Daniel Walker22a8bde2007-10-18 03:06:07 -07001229
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230 /* Count loaded sections and allocate structures */
Rusty Russell8f6d0372010-08-05 12:59:09 -06001231 for (i = 0; i < info->hdr->e_shnum; i++)
1232 if (!sect_empty(&info->sechdrs[i]))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 nloaded++;
1234 size[0] = ALIGN(sizeof(*sect_attrs)
1235 + nloaded * sizeof(sect_attrs->attrs[0]),
1236 sizeof(sect_attrs->grp.attrs[0]));
1237 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001238 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1239 if (sect_attrs == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 return;
1241
1242 /* Setup section attributes. */
1243 sect_attrs->grp.name = "sections";
1244 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1245
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001246 sect_attrs->nsections = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247 sattr = &sect_attrs->attrs[0];
1248 gattr = &sect_attrs->grp.attrs[0];
Rusty Russell8f6d0372010-08-05 12:59:09 -06001249 for (i = 0; i < info->hdr->e_shnum; i++) {
1250 Elf_Shdr *sec = &info->sechdrs[i];
1251 if (sect_empty(sec))
Helge Deller35dead42009-12-03 00:29:15 +01001252 continue;
Rusty Russell8f6d0372010-08-05 12:59:09 -06001253 sattr->address = sec->sh_addr;
1254 sattr->name = kstrdup(info->secstrings + sec->sh_name,
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001255 GFP_KERNEL);
1256 if (sattr->name == NULL)
1257 goto out;
1258 sect_attrs->nsections++;
Eric W. Biederman361795b2010-02-12 13:41:56 -08001259 sysfs_attr_init(&sattr->mattr.attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260 sattr->mattr.show = module_sect_show;
1261 sattr->mattr.store = NULL;
1262 sattr->mattr.attr.name = sattr->name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263 sattr->mattr.attr.mode = S_IRUGO;
1264 *(gattr++) = &(sattr++)->mattr.attr;
1265 }
1266 *gattr = NULL;
1267
1268 if (sysfs_create_group(&mod->mkobj.kobj, &sect_attrs->grp))
1269 goto out;
1270
1271 mod->sect_attrs = sect_attrs;
1272 return;
1273 out:
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001274 free_sect_attrs(sect_attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275}
1276
1277static void remove_sect_attrs(struct module *mod)
1278{
1279 if (mod->sect_attrs) {
1280 sysfs_remove_group(&mod->mkobj.kobj,
1281 &mod->sect_attrs->grp);
1282 /* We are positive that no one is using any sect attrs
1283 * at this point. Deallocate immediately. */
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001284 free_sect_attrs(mod->sect_attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285 mod->sect_attrs = NULL;
1286 }
1287}
1288
Roland McGrath6d760132007-10-16 23:26:40 -07001289/*
1290 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1291 */
1292
1293struct module_notes_attrs {
1294 struct kobject *dir;
1295 unsigned int notes;
1296 struct bin_attribute attrs[0];
1297};
1298
Chris Wright2c3c8be2010-05-12 18:28:57 -07001299static ssize_t module_notes_read(struct file *filp, struct kobject *kobj,
Roland McGrath6d760132007-10-16 23:26:40 -07001300 struct bin_attribute *bin_attr,
1301 char *buf, loff_t pos, size_t count)
1302{
1303 /*
1304 * The caller checked the pos and count against our size.
1305 */
1306 memcpy(buf, bin_attr->private + pos, count);
1307 return count;
1308}
1309
1310static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1311 unsigned int i)
1312{
1313 if (notes_attrs->dir) {
1314 while (i-- > 0)
1315 sysfs_remove_bin_file(notes_attrs->dir,
1316 &notes_attrs->attrs[i]);
Alexey Dobriyane9432092008-09-23 23:51:11 +04001317 kobject_put(notes_attrs->dir);
Roland McGrath6d760132007-10-16 23:26:40 -07001318 }
1319 kfree(notes_attrs);
1320}
1321
Rusty Russell8f6d0372010-08-05 12:59:09 -06001322static void add_notes_attrs(struct module *mod, const struct load_info *info)
Roland McGrath6d760132007-10-16 23:26:40 -07001323{
1324 unsigned int notes, loaded, i;
1325 struct module_notes_attrs *notes_attrs;
1326 struct bin_attribute *nattr;
1327
Ingo Molnarea6bff32009-08-28 10:44:56 +02001328 /* failed to create section attributes, so can't create notes */
1329 if (!mod->sect_attrs)
1330 return;
1331
Roland McGrath6d760132007-10-16 23:26:40 -07001332 /* Count notes sections and allocate structures. */
1333 notes = 0;
Rusty Russell8f6d0372010-08-05 12:59:09 -06001334 for (i = 0; i < info->hdr->e_shnum; i++)
1335 if (!sect_empty(&info->sechdrs[i]) &&
1336 (info->sechdrs[i].sh_type == SHT_NOTE))
Roland McGrath6d760132007-10-16 23:26:40 -07001337 ++notes;
1338
1339 if (notes == 0)
1340 return;
1341
1342 notes_attrs = kzalloc(sizeof(*notes_attrs)
1343 + notes * sizeof(notes_attrs->attrs[0]),
1344 GFP_KERNEL);
1345 if (notes_attrs == NULL)
1346 return;
1347
1348 notes_attrs->notes = notes;
1349 nattr = &notes_attrs->attrs[0];
Rusty Russell8f6d0372010-08-05 12:59:09 -06001350 for (loaded = i = 0; i < info->hdr->e_shnum; ++i) {
1351 if (sect_empty(&info->sechdrs[i]))
Roland McGrath6d760132007-10-16 23:26:40 -07001352 continue;
Rusty Russell8f6d0372010-08-05 12:59:09 -06001353 if (info->sechdrs[i].sh_type == SHT_NOTE) {
Eric W. Biederman361795b2010-02-12 13:41:56 -08001354 sysfs_bin_attr_init(nattr);
Roland McGrath6d760132007-10-16 23:26:40 -07001355 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1356 nattr->attr.mode = S_IRUGO;
Rusty Russell8f6d0372010-08-05 12:59:09 -06001357 nattr->size = info->sechdrs[i].sh_size;
1358 nattr->private = (void *) info->sechdrs[i].sh_addr;
Roland McGrath6d760132007-10-16 23:26:40 -07001359 nattr->read = module_notes_read;
1360 ++nattr;
1361 }
1362 ++loaded;
1363 }
1364
Greg Kroah-Hartman4ff6abf2007-11-05 22:24:43 -08001365 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
Roland McGrath6d760132007-10-16 23:26:40 -07001366 if (!notes_attrs->dir)
1367 goto out;
1368
1369 for (i = 0; i < notes; ++i)
1370 if (sysfs_create_bin_file(notes_attrs->dir,
1371 &notes_attrs->attrs[i]))
1372 goto out;
1373
1374 mod->notes_attrs = notes_attrs;
1375 return;
1376
1377 out:
1378 free_notes_attrs(notes_attrs, i);
1379}
1380
1381static void remove_notes_attrs(struct module *mod)
1382{
1383 if (mod->notes_attrs)
1384 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1385}
1386
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387#else
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001388
Rusty Russell8f6d0372010-08-05 12:59:09 -06001389static inline void add_sect_attrs(struct module *mod,
1390 const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391{
1392}
1393
1394static inline void remove_sect_attrs(struct module *mod)
1395{
1396}
Roland McGrath6d760132007-10-16 23:26:40 -07001397
Rusty Russell8f6d0372010-08-05 12:59:09 -06001398static inline void add_notes_attrs(struct module *mod,
1399 const struct load_info *info)
Roland McGrath6d760132007-10-16 23:26:40 -07001400{
1401}
1402
1403static inline void remove_notes_attrs(struct module *mod)
1404{
1405}
Rusty Russell8f6d0372010-08-05 12:59:09 -06001406#endif /* CONFIG_KALLSYMS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001408static void add_usage_links(struct module *mod)
1409{
1410#ifdef CONFIG_MODULE_UNLOAD
1411 struct module_use *use;
1412 int nowarn;
1413
Rusty Russell75676502010-06-05 11:17:36 -06001414 mutex_lock(&module_mutex);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001415 list_for_each_entry(use, &mod->target_list, target_list) {
1416 nowarn = sysfs_create_link(use->target->holders_dir,
1417 &mod->mkobj.kobj, mod->name);
1418 }
Rusty Russell75676502010-06-05 11:17:36 -06001419 mutex_unlock(&module_mutex);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001420#endif
1421}
1422
1423static void del_usage_links(struct module *mod)
1424{
1425#ifdef CONFIG_MODULE_UNLOAD
1426 struct module_use *use;
1427
Rusty Russell75676502010-06-05 11:17:36 -06001428 mutex_lock(&module_mutex);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001429 list_for_each_entry(use, &mod->target_list, target_list)
1430 sysfs_remove_link(use->target->holders_dir, mod->name);
Rusty Russell75676502010-06-05 11:17:36 -06001431 mutex_unlock(&module_mutex);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001432#endif
1433}
1434
Rusty Russell6407ebb22010-06-05 11:17:36 -06001435static int module_add_modinfo_attrs(struct module *mod)
Matt Domschc988d2b2005-06-23 22:05:15 -07001436{
1437 struct module_attribute *attr;
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001438 struct module_attribute *temp_attr;
Matt Domschc988d2b2005-06-23 22:05:15 -07001439 int error = 0;
1440 int i;
1441
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001442 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1443 (ARRAY_SIZE(modinfo_attrs) + 1)),
1444 GFP_KERNEL);
1445 if (!mod->modinfo_attrs)
1446 return -ENOMEM;
1447
1448 temp_attr = mod->modinfo_attrs;
Matt Domschc988d2b2005-06-23 22:05:15 -07001449 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1450 if (!attr->test ||
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001451 (attr->test && attr->test(mod))) {
1452 memcpy(temp_attr, attr, sizeof(*temp_attr));
Eric W. Biederman361795b2010-02-12 13:41:56 -08001453 sysfs_attr_init(&temp_attr->attr);
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001454 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1455 ++temp_attr;
1456 }
Matt Domschc988d2b2005-06-23 22:05:15 -07001457 }
1458 return error;
1459}
1460
Rusty Russell6407ebb22010-06-05 11:17:36 -06001461static void module_remove_modinfo_attrs(struct module *mod)
Matt Domschc988d2b2005-06-23 22:05:15 -07001462{
1463 struct module_attribute *attr;
1464 int i;
1465
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001466 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1467 /* pick a field to test for end of list */
1468 if (!attr->attr.name)
1469 break;
Matt Domschc988d2b2005-06-23 22:05:15 -07001470 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001471 if (attr->free)
1472 attr->free(mod);
Matt Domschc988d2b2005-06-23 22:05:15 -07001473 }
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001474 kfree(mod->modinfo_attrs);
Matt Domschc988d2b2005-06-23 22:05:15 -07001475}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476
Rusty Russell6407ebb22010-06-05 11:17:36 -06001477static int mod_sysfs_init(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478{
1479 int err;
Greg Kroah-Hartman6494a932008-01-27 15:38:40 -08001480 struct kobject *kobj;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481
Greg Kroah-Hartman823bccf2007-04-13 13:15:19 -07001482 if (!module_sysfs_initialized) {
1483 printk(KERN_ERR "%s: module sysfs not initialized\n",
Ed Swierk1cc5f712006-09-25 16:25:36 -07001484 mod->name);
1485 err = -EINVAL;
1486 goto out;
1487 }
Greg Kroah-Hartman6494a932008-01-27 15:38:40 -08001488
1489 kobj = kset_find_obj(module_kset, mod->name);
1490 if (kobj) {
1491 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1492 kobject_put(kobj);
1493 err = -EINVAL;
1494 goto out;
1495 }
1496
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497 mod->mkobj.mod = mod;
Kay Sieverse17e0f52006-11-24 12:15:25 +01001498
Greg Kroah-Hartmanac3c8142007-12-17 23:05:35 -07001499 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1500 mod->mkobj.kobj.kset = module_kset;
1501 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1502 "%s", mod->name);
1503 if (err)
1504 kobject_put(&mod->mkobj.kobj);
Kay Sievers270a6c42007-01-18 13:26:15 +01001505
Kay Sievers97c146e2007-11-29 23:46:11 +01001506 /* delay uevent until full sysfs population */
Kay Sievers270a6c42007-01-18 13:26:15 +01001507out:
1508 return err;
1509}
1510
Rusty Russell6407ebb22010-06-05 11:17:36 -06001511static int mod_sysfs_setup(struct module *mod,
Rusty Russell8f6d0372010-08-05 12:59:09 -06001512 const struct load_info *info,
Kay Sievers270a6c42007-01-18 13:26:15 +01001513 struct kernel_param *kparam,
1514 unsigned int num_params)
1515{
1516 int err;
1517
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001518 err = mod_sysfs_init(mod);
1519 if (err)
1520 goto out;
1521
Greg Kroah-Hartman4ff6abf2007-11-05 22:24:43 -08001522 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
Akinobu Mita240936e2007-04-26 00:12:09 -07001523 if (!mod->holders_dir) {
1524 err = -ENOMEM;
Kay Sievers270a6c42007-01-18 13:26:15 +01001525 goto out_unreg;
Akinobu Mita240936e2007-04-26 00:12:09 -07001526 }
Kay Sievers270a6c42007-01-18 13:26:15 +01001527
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528 err = module_param_sysfs_setup(mod, kparam, num_params);
1529 if (err)
Kay Sievers270a6c42007-01-18 13:26:15 +01001530 goto out_unreg_holders;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531
Matt Domschc988d2b2005-06-23 22:05:15 -07001532 err = module_add_modinfo_attrs(mod);
1533 if (err)
Kay Sieverse17e0f52006-11-24 12:15:25 +01001534 goto out_unreg_param;
Matt Domschc988d2b2005-06-23 22:05:15 -07001535
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001536 add_usage_links(mod);
Rusty Russell8f6d0372010-08-05 12:59:09 -06001537 add_sect_attrs(mod, info);
1538 add_notes_attrs(mod, info);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001539
Kay Sieverse17e0f52006-11-24 12:15:25 +01001540 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541 return 0;
1542
Kay Sieverse17e0f52006-11-24 12:15:25 +01001543out_unreg_param:
1544 module_param_sysfs_remove(mod);
Kay Sievers270a6c42007-01-18 13:26:15 +01001545out_unreg_holders:
Greg Kroah-Hartman78a2d902007-12-20 08:13:05 -08001546 kobject_put(mod->holders_dir);
Kay Sievers270a6c42007-01-18 13:26:15 +01001547out_unreg:
Kay Sieverse17e0f52006-11-24 12:15:25 +01001548 kobject_put(&mod->mkobj.kobj);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001549out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550 return err;
1551}
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001552
1553static void mod_sysfs_fini(struct module *mod)
1554{
Rusty Russell8f6d0372010-08-05 12:59:09 -06001555 remove_notes_attrs(mod);
1556 remove_sect_attrs(mod);
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001557 kobject_put(&mod->mkobj.kobj);
1558}
1559
Rusty Russell8f6d0372010-08-05 12:59:09 -06001560#else /* !CONFIG_SYSFS */
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001561
Rusty Russell8f6d0372010-08-05 12:59:09 -06001562static int mod_sysfs_setup(struct module *mod,
1563 const struct load_info *info,
Rusty Russell6407ebb22010-06-05 11:17:36 -06001564 struct kernel_param *kparam,
1565 unsigned int num_params)
1566{
1567 return 0;
1568}
1569
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001570static void mod_sysfs_fini(struct module *mod)
1571{
1572}
1573
Rusty Russell36b03602010-08-05 12:59:09 -06001574static void module_remove_modinfo_attrs(struct module *mod)
1575{
1576}
1577
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001578static void del_usage_links(struct module *mod)
1579{
1580}
1581
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001582#endif /* CONFIG_SYSFS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583
Rusty Russell36b03602010-08-05 12:59:09 -06001584static void mod_sysfs_teardown(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585{
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001586 del_usage_links(mod);
Matt Domschc988d2b2005-06-23 22:05:15 -07001587 module_remove_modinfo_attrs(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588 module_param_sysfs_remove(mod);
Greg Kroah-Hartman78a2d902007-12-20 08:13:05 -08001589 kobject_put(mod->mkobj.drivers_dir);
1590 kobject_put(mod->holders_dir);
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001591 mod_sysfs_fini(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592}
1593
1594/*
1595 * unlink the module with the whole machine is stopped with interrupts off
1596 * - this defends against kallsyms not taking locks
1597 */
1598static int __unlink_module(void *_mod)
1599{
1600 struct module *mod = _mod;
1601 list_del(&mod->list);
Linus Torvalds53363772010-10-05 11:29:27 -07001602 module_bug_cleanup(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603 return 0;
1604}
1605
matthieu castet84e1c6b2010-11-16 22:35:16 +01001606#ifdef CONFIG_DEBUG_SET_MODULE_RONX
1607/*
1608 * LKM RO/NX protection: protect module's text/ro-data
1609 * from modification and any data from execution.
1610 */
1611void set_page_attributes(void *start, void *end, int (*set)(unsigned long start, int num_pages))
1612{
1613 unsigned long begin_pfn = PFN_DOWN((unsigned long)start);
1614 unsigned long end_pfn = PFN_DOWN((unsigned long)end);
1615
1616 if (end_pfn > begin_pfn)
1617 set(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn);
1618}
1619
1620static void set_section_ro_nx(void *base,
1621 unsigned long text_size,
1622 unsigned long ro_size,
1623 unsigned long total_size)
1624{
1625 /* begin and end PFNs of the current subsection */
1626 unsigned long begin_pfn;
1627 unsigned long end_pfn;
1628
1629 /*
1630 * Set RO for module text and RO-data:
1631 * - Always protect first page.
1632 * - Do not protect last partial page.
1633 */
1634 if (ro_size > 0)
1635 set_page_attributes(base, base + ro_size, set_memory_ro);
1636
1637 /*
1638 * Set NX permissions for module data:
1639 * - Do not protect first partial page.
1640 * - Always protect last page.
1641 */
1642 if (total_size > text_size) {
1643 begin_pfn = PFN_UP((unsigned long)base + text_size);
1644 end_pfn = PFN_UP((unsigned long)base + total_size);
1645 if (end_pfn > begin_pfn)
1646 set_memory_nx(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn);
1647 }
1648}
1649
Jan Glauber01526ed2011-05-19 16:55:26 -06001650static void unset_module_core_ro_nx(struct module *mod)
matthieu castet84e1c6b2010-11-16 22:35:16 +01001651{
Jan Glauber01526ed2011-05-19 16:55:26 -06001652 set_page_attributes(mod->module_core + mod->core_text_size,
1653 mod->module_core + mod->core_size,
1654 set_memory_x);
1655 set_page_attributes(mod->module_core,
1656 mod->module_core + mod->core_ro_size,
1657 set_memory_rw);
1658}
1659
1660static void unset_module_init_ro_nx(struct module *mod)
1661{
1662 set_page_attributes(mod->module_init + mod->init_text_size,
1663 mod->module_init + mod->init_size,
1664 set_memory_x);
1665 set_page_attributes(mod->module_init,
1666 mod->module_init + mod->init_ro_size,
1667 set_memory_rw);
matthieu castet84e1c6b2010-11-16 22:35:16 +01001668}
1669
1670/* Iterate through all modules and set each module's text as RW */
Daniel J Blueman5d05c702011-03-08 22:01:47 +08001671void set_all_modules_text_rw(void)
matthieu castet84e1c6b2010-11-16 22:35:16 +01001672{
1673 struct module *mod;
1674
1675 mutex_lock(&module_mutex);
1676 list_for_each_entry_rcu(mod, &modules, list) {
1677 if ((mod->module_core) && (mod->core_text_size)) {
1678 set_page_attributes(mod->module_core,
1679 mod->module_core + mod->core_text_size,
1680 set_memory_rw);
1681 }
1682 if ((mod->module_init) && (mod->init_text_size)) {
1683 set_page_attributes(mod->module_init,
1684 mod->module_init + mod->init_text_size,
1685 set_memory_rw);
1686 }
1687 }
1688 mutex_unlock(&module_mutex);
1689}
1690
1691/* Iterate through all modules and set each module's text as RO */
Daniel J Blueman5d05c702011-03-08 22:01:47 +08001692void set_all_modules_text_ro(void)
matthieu castet84e1c6b2010-11-16 22:35:16 +01001693{
1694 struct module *mod;
1695
1696 mutex_lock(&module_mutex);
1697 list_for_each_entry_rcu(mod, &modules, list) {
1698 if ((mod->module_core) && (mod->core_text_size)) {
1699 set_page_attributes(mod->module_core,
1700 mod->module_core + mod->core_text_size,
1701 set_memory_ro);
1702 }
1703 if ((mod->module_init) && (mod->init_text_size)) {
1704 set_page_attributes(mod->module_init,
1705 mod->module_init + mod->init_text_size,
1706 set_memory_ro);
1707 }
1708 }
1709 mutex_unlock(&module_mutex);
1710}
1711#else
1712static 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 -06001713static void unset_module_core_ro_nx(struct module *mod) { }
1714static void unset_module_init_ro_nx(struct module *mod) { }
matthieu castet84e1c6b2010-11-16 22:35:16 +01001715#endif
1716
Jonas Bonn74e08fc2011-06-30 21:22:11 +02001717void __weak module_free(struct module *mod, void *module_region)
1718{
1719 vfree(module_region);
1720}
1721
1722void __weak module_arch_cleanup(struct module *mod)
1723{
1724}
1725
Rusty Russell75676502010-06-05 11:17:36 -06001726/* Free a module, remove from lists, etc. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727static void free_module(struct module *mod)
1728{
Li Zefan7ead8b82009-08-17 16:56:28 +08001729 trace_module_free(mod);
1730
Linus Torvalds1da177e2005-04-16 15:20:36 -07001731 /* Delete from various lists */
Rusty Russell75676502010-06-05 11:17:36 -06001732 mutex_lock(&module_mutex);
Rusty Russell9b1a4d32008-07-28 12:16:30 -05001733 stop_machine(__unlink_module, mod, NULL);
Rusty Russell75676502010-06-05 11:17:36 -06001734 mutex_unlock(&module_mutex);
Rusty Russell36b03602010-08-05 12:59:09 -06001735 mod_sysfs_teardown(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736
Jason Baronb82bab4b2010-07-27 13:18:01 -07001737 /* Remove dynamic debug info */
1738 ddebug_remove_module(mod->name);
1739
Linus Torvalds1da177e2005-04-16 15:20:36 -07001740 /* Arch-specific cleanup. */
1741 module_arch_cleanup(mod);
1742
1743 /* Module unload stuff */
1744 module_unload_free(mod);
1745
Rusty Russelle180a6b2009-03-31 13:05:29 -06001746 /* Free any allocated parameters. */
1747 destroy_params(mod->kp, mod->num_kp);
1748
Linus Torvalds1da177e2005-04-16 15:20:36 -07001749 /* This may be NULL, but that's OK */
Jan Glauber01526ed2011-05-19 16:55:26 -06001750 unset_module_init_ro_nx(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751 module_free(mod, mod->module_init);
1752 kfree(mod->args);
Tejun Heo259354d2010-03-10 18:56:10 +09001753 percpu_modfree(mod);
Rusty Russell9f85a4b2010-08-05 12:59:04 -06001754
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001755 /* Free lock-classes: */
1756 lockdep_free_key_range(mod->module_core, mod->core_size);
1757
Linus Torvalds1da177e2005-04-16 15:20:36 -07001758 /* Finally, free the core (containing the module structure) */
Jan Glauber01526ed2011-05-19 16:55:26 -06001759 unset_module_core_ro_nx(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760 module_free(mod, mod->module_core);
Bernd Schmidteb8cdec2009-09-21 17:03:57 -07001761
1762#ifdef CONFIG_MPU
1763 update_protections(current->mm);
1764#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001765}
1766
1767void *__symbol_get(const char *symbol)
1768{
1769 struct module *owner;
Tim Abbott414fd312008-12-05 19:03:56 -05001770 const struct kernel_symbol *sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001771
Rusty Russell24da1cb2007-07-15 23:41:46 -07001772 preempt_disable();
Tim Abbott414fd312008-12-05 19:03:56 -05001773 sym = find_symbol(symbol, &owner, NULL, true, true);
1774 if (sym && strong_try_module_get(owner))
1775 sym = NULL;
Rusty Russell24da1cb2007-07-15 23:41:46 -07001776 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777
Tim Abbott414fd312008-12-05 19:03:56 -05001778 return sym ? (void *)sym->value : NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001779}
1780EXPORT_SYMBOL_GPL(__symbol_get);
1781
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001782/*
1783 * Ensure that an exported symbol [global namespace] does not already exist
Robert P. J. Day02a3e592007-05-09 07:26:28 +02001784 * in the kernel or in some other module's exported symbol table.
Rusty Russellbe593f42010-06-05 11:17:37 -06001785 *
1786 * You must hold the module_mutex.
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001787 */
1788static int verify_export_symbols(struct module *mod)
1789{
Rusty Russellb2111042008-05-01 21:15:00 -05001790 unsigned int i;
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001791 struct module *owner;
Rusty Russellb2111042008-05-01 21:15:00 -05001792 const struct kernel_symbol *s;
1793 struct {
1794 const struct kernel_symbol *sym;
1795 unsigned int num;
1796 } arr[] = {
1797 { mod->syms, mod->num_syms },
1798 { mod->gpl_syms, mod->num_gpl_syms },
1799 { mod->gpl_future_syms, mod->num_gpl_future_syms },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -05001800#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russellb2111042008-05-01 21:15:00 -05001801 { mod->unused_syms, mod->num_unused_syms },
1802 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -05001803#endif
Rusty Russellb2111042008-05-01 21:15:00 -05001804 };
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001805
Rusty Russellb2111042008-05-01 21:15:00 -05001806 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1807 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
Rusty Russellbe593f42010-06-05 11:17:37 -06001808 if (find_symbol(s->name, &owner, NULL, true, false)) {
Rusty Russellb2111042008-05-01 21:15:00 -05001809 printk(KERN_ERR
1810 "%s: exports duplicate symbol %s"
1811 " (owned by %s)\n",
1812 mod->name, s->name, module_name(owner));
1813 return -ENOEXEC;
1814 }
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001815 }
Rusty Russellb2111042008-05-01 21:15:00 -05001816 }
1817 return 0;
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001818}
1819
Matti Linnanvuori9a4b9702007-11-08 08:37:38 -08001820/* Change all symbols so that st_value encodes the pointer directly. */
Rusty Russell49668682010-08-05 12:59:10 -06001821static int simplify_symbols(struct module *mod, const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822{
Rusty Russell49668682010-08-05 12:59:10 -06001823 Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
1824 Elf_Sym *sym = (void *)symsec->sh_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001825 unsigned long secbase;
Rusty Russell49668682010-08-05 12:59:10 -06001826 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001827 int ret = 0;
Tim Abbott414fd312008-12-05 19:03:56 -05001828 const struct kernel_symbol *ksym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001829
Rusty Russell49668682010-08-05 12:59:10 -06001830 for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) {
1831 const char *name = info->strtab + sym[i].st_name;
1832
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833 switch (sym[i].st_shndx) {
1834 case SHN_COMMON:
1835 /* We compiled with -fno-common. These are not
1836 supposed to happen. */
Rusty Russell49668682010-08-05 12:59:10 -06001837 DEBUGP("Common symbol: %s\n", name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001838 printk("%s: please compile with -fno-common\n",
1839 mod->name);
1840 ret = -ENOEXEC;
1841 break;
1842
1843 case SHN_ABS:
1844 /* Don't need to do anything */
1845 DEBUGP("Absolute symbol: 0x%08lx\n",
1846 (long)sym[i].st_value);
1847 break;
1848
1849 case SHN_UNDEF:
Rusty Russell49668682010-08-05 12:59:10 -06001850 ksym = resolve_symbol_wait(mod, info, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851 /* Ok if resolved. */
Rusty Russell9bea7f22010-06-05 11:17:37 -06001852 if (ksym && !IS_ERR(ksym)) {
Tim Abbott414fd312008-12-05 19:03:56 -05001853 sym[i].st_value = ksym->value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001854 break;
Tim Abbott414fd312008-12-05 19:03:56 -05001855 }
1856
Linus Torvalds1da177e2005-04-16 15:20:36 -07001857 /* Ok if weak. */
Rusty Russell9bea7f22010-06-05 11:17:37 -06001858 if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001859 break;
1860
Rusty Russell9bea7f22010-06-05 11:17:37 -06001861 printk(KERN_WARNING "%s: Unknown symbol %s (err %li)\n",
Rusty Russell49668682010-08-05 12:59:10 -06001862 mod->name, name, PTR_ERR(ksym));
Rusty Russell9bea7f22010-06-05 11:17:37 -06001863 ret = PTR_ERR(ksym) ?: -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001864 break;
1865
1866 default:
1867 /* Divert to percpu allocation if a percpu var. */
Rusty Russell49668682010-08-05 12:59:10 -06001868 if (sym[i].st_shndx == info->index.pcpu)
Tejun Heo259354d2010-03-10 18:56:10 +09001869 secbase = (unsigned long)mod_percpu(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001870 else
Rusty Russell49668682010-08-05 12:59:10 -06001871 secbase = info->sechdrs[sym[i].st_shndx].sh_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872 sym[i].st_value += secbase;
1873 break;
1874 }
1875 }
1876
1877 return ret;
1878}
1879
Jonas Bonn74e08fc2011-06-30 21:22:11 +02001880int __weak apply_relocate(Elf_Shdr *sechdrs,
1881 const char *strtab,
1882 unsigned int symindex,
1883 unsigned int relsec,
1884 struct module *me)
1885{
1886 pr_err("module %s: REL relocation unsupported\n", me->name);
1887 return -ENOEXEC;
1888}
1889
1890int __weak apply_relocate_add(Elf_Shdr *sechdrs,
1891 const char *strtab,
1892 unsigned int symindex,
1893 unsigned int relsec,
1894 struct module *me)
1895{
1896 pr_err("module %s: RELA relocation unsupported\n", me->name);
1897 return -ENOEXEC;
1898}
1899
Rusty Russell49668682010-08-05 12:59:10 -06001900static int apply_relocations(struct module *mod, const struct load_info *info)
Rusty Russell22e268e2010-08-05 12:59:05 -06001901{
1902 unsigned int i;
1903 int err = 0;
1904
1905 /* Now do relocations. */
Rusty Russell49668682010-08-05 12:59:10 -06001906 for (i = 1; i < info->hdr->e_shnum; i++) {
1907 unsigned int infosec = info->sechdrs[i].sh_info;
Rusty Russell22e268e2010-08-05 12:59:05 -06001908
1909 /* Not a valid relocation section? */
Rusty Russell49668682010-08-05 12:59:10 -06001910 if (infosec >= info->hdr->e_shnum)
Rusty Russell22e268e2010-08-05 12:59:05 -06001911 continue;
1912
1913 /* Don't bother with non-allocated sections */
Rusty Russell49668682010-08-05 12:59:10 -06001914 if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC))
Rusty Russell22e268e2010-08-05 12:59:05 -06001915 continue;
1916
Rusty Russell49668682010-08-05 12:59:10 -06001917 if (info->sechdrs[i].sh_type == SHT_REL)
1918 err = apply_relocate(info->sechdrs, info->strtab,
1919 info->index.sym, i, mod);
1920 else if (info->sechdrs[i].sh_type == SHT_RELA)
1921 err = apply_relocate_add(info->sechdrs, info->strtab,
1922 info->index.sym, i, mod);
Rusty Russell22e268e2010-08-05 12:59:05 -06001923 if (err < 0)
1924 break;
1925 }
1926 return err;
1927}
1928
Helge Deller088af9a2008-12-31 12:31:18 +01001929/* Additional bytes needed by arch in front of individual sections */
1930unsigned int __weak arch_mod_section_prepend(struct module *mod,
1931 unsigned int section)
1932{
1933 /* default implementation just returns zero */
1934 return 0;
1935}
1936
Linus Torvalds1da177e2005-04-16 15:20:36 -07001937/* Update size with this section: return offset. */
Helge Deller088af9a2008-12-31 12:31:18 +01001938static long get_offset(struct module *mod, unsigned int *size,
1939 Elf_Shdr *sechdr, unsigned int section)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940{
1941 long ret;
1942
Helge Deller088af9a2008-12-31 12:31:18 +01001943 *size += arch_mod_section_prepend(mod, section);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1945 *size = ret + sechdr->sh_size;
1946 return ret;
1947}
1948
1949/* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1950 might -- code, read-only data, read-write data, small data. Tally
1951 sizes, and place the offsets into sh_entsize fields: high bit means it
1952 belongs in init. */
Rusty Russell49668682010-08-05 12:59:10 -06001953static void layout_sections(struct module *mod, struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001954{
1955 static unsigned long const masks[][2] = {
1956 /* NOTE: all executable code must be the first section
1957 * in this array; otherwise modify the text_size
1958 * finder in the two loops below */
1959 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1960 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1961 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1962 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1963 };
1964 unsigned int m, i;
1965
Rusty Russell49668682010-08-05 12:59:10 -06001966 for (i = 0; i < info->hdr->e_shnum; i++)
1967 info->sechdrs[i].sh_entsize = ~0UL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001968
1969 DEBUGP("Core section allocation order:\n");
1970 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
Rusty Russell49668682010-08-05 12:59:10 -06001971 for (i = 0; i < info->hdr->e_shnum; ++i) {
1972 Elf_Shdr *s = &info->sechdrs[i];
1973 const char *sname = info->secstrings + s->sh_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001974
1975 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1976 || (s->sh_flags & masks[m][1])
1977 || s->sh_entsize != ~0UL
Rusty Russell49668682010-08-05 12:59:10 -06001978 || strstarts(sname, ".init"))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979 continue;
Helge Deller088af9a2008-12-31 12:31:18 +01001980 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
Rusty Russell49668682010-08-05 12:59:10 -06001981 DEBUGP("\t%s\n", name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001982 }
matthieu castet84e1c6b2010-11-16 22:35:16 +01001983 switch (m) {
1984 case 0: /* executable */
1985 mod->core_size = debug_align(mod->core_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001986 mod->core_text_size = mod->core_size;
matthieu castet84e1c6b2010-11-16 22:35:16 +01001987 break;
1988 case 1: /* RO: text and ro-data */
1989 mod->core_size = debug_align(mod->core_size);
1990 mod->core_ro_size = mod->core_size;
1991 break;
1992 case 3: /* whole core */
1993 mod->core_size = debug_align(mod->core_size);
1994 break;
1995 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001996 }
1997
1998 DEBUGP("Init section allocation order:\n");
1999 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
Rusty Russell49668682010-08-05 12:59:10 -06002000 for (i = 0; i < info->hdr->e_shnum; ++i) {
2001 Elf_Shdr *s = &info->sechdrs[i];
2002 const char *sname = info->secstrings + s->sh_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002003
2004 if ((s->sh_flags & masks[m][0]) != masks[m][0]
2005 || (s->sh_flags & masks[m][1])
2006 || s->sh_entsize != ~0UL
Rusty Russell49668682010-08-05 12:59:10 -06002007 || !strstarts(sname, ".init"))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002008 continue;
Helge Deller088af9a2008-12-31 12:31:18 +01002009 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002010 | INIT_OFFSET_MASK);
Rusty Russell49668682010-08-05 12:59:10 -06002011 DEBUGP("\t%s\n", sname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002012 }
matthieu castet84e1c6b2010-11-16 22:35:16 +01002013 switch (m) {
2014 case 0: /* executable */
2015 mod->init_size = debug_align(mod->init_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002016 mod->init_text_size = mod->init_size;
matthieu castet84e1c6b2010-11-16 22:35:16 +01002017 break;
2018 case 1: /* RO: text and ro-data */
2019 mod->init_size = debug_align(mod->init_size);
2020 mod->init_ro_size = mod->init_size;
2021 break;
2022 case 3: /* whole init */
2023 mod->init_size = debug_align(mod->init_size);
2024 break;
2025 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026 }
2027}
2028
Linus Torvalds1da177e2005-04-16 15:20:36 -07002029static void set_license(struct module *mod, const char *license)
2030{
2031 if (!license)
2032 license = "unspecified";
2033
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002034 if (!license_is_gpl_compatible(license)) {
Andi Kleen25ddbb12008-10-15 22:01:41 -07002035 if (!test_taint(TAINT_PROPRIETARY_MODULE))
Jan Dittmer1d4d2622006-10-28 10:38:38 -07002036 printk(KERN_WARNING "%s: module license '%s' taints "
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002037 "kernel.\n", mod->name, license);
2038 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002039 }
2040}
2041
2042/* Parse tag=value strings from .modinfo section */
2043static char *next_string(char *string, unsigned long *secsize)
2044{
2045 /* Skip non-zero chars */
2046 while (string[0]) {
2047 string++;
2048 if ((*secsize)-- <= 1)
2049 return NULL;
2050 }
2051
2052 /* Skip any zero padding. */
2053 while (!string[0]) {
2054 string++;
2055 if ((*secsize)-- <= 1)
2056 return NULL;
2057 }
2058 return string;
2059}
2060
Rusty Russell49668682010-08-05 12:59:10 -06002061static char *get_modinfo(struct load_info *info, const char *tag)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002062{
2063 char *p;
2064 unsigned int taglen = strlen(tag);
Rusty Russell49668682010-08-05 12:59:10 -06002065 Elf_Shdr *infosec = &info->sechdrs[info->index.info];
2066 unsigned long size = infosec->sh_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002067
Rusty Russell49668682010-08-05 12:59:10 -06002068 for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002069 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
2070 return p + taglen + 1;
2071 }
2072 return NULL;
2073}
2074
Rusty Russell49668682010-08-05 12:59:10 -06002075static void setup_modinfo(struct module *mod, struct load_info *info)
Matt Domschc988d2b2005-06-23 22:05:15 -07002076{
2077 struct module_attribute *attr;
2078 int i;
2079
2080 for (i = 0; (attr = modinfo_attrs[i]); i++) {
2081 if (attr->setup)
Rusty Russell49668682010-08-05 12:59:10 -06002082 attr->setup(mod, get_modinfo(info, attr->attr.name));
Matt Domschc988d2b2005-06-23 22:05:15 -07002083 }
2084}
Matt Domschc988d2b2005-06-23 22:05:15 -07002085
Rusty Russella263f772009-09-25 00:32:58 -06002086static void free_modinfo(struct module *mod)
2087{
2088 struct module_attribute *attr;
2089 int i;
2090
2091 for (i = 0; (attr = modinfo_attrs[i]); i++) {
2092 if (attr->free)
2093 attr->free(mod);
2094 }
2095}
2096
Linus Torvalds1da177e2005-04-16 15:20:36 -07002097#ifdef CONFIG_KALLSYMS
WANG Cong15bba372008-07-24 15:41:48 +01002098
2099/* lookup symbol in given range of kernel_symbols */
2100static const struct kernel_symbol *lookup_symbol(const char *name,
2101 const struct kernel_symbol *start,
2102 const struct kernel_symbol *stop)
2103{
Alessio Igor Bogani9d634872011-05-18 22:35:59 +02002104 return bsearch(name, start, stop - start,
2105 sizeof(struct kernel_symbol), cmp_name);
WANG Cong15bba372008-07-24 15:41:48 +01002106}
2107
Tim Abbottca4787b2009-01-05 08:40:10 -06002108static int is_exported(const char *name, unsigned long value,
2109 const struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002110{
Tim Abbottca4787b2009-01-05 08:40:10 -06002111 const struct kernel_symbol *ks;
2112 if (!mod)
2113 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
Sam Ravnborg3fd68052006-02-08 21:16:45 +01002114 else
Tim Abbottca4787b2009-01-05 08:40:10 -06002115 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
2116 return ks != NULL && ks->value == value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002117}
2118
2119/* As per nm */
Rusty Russelleded41c2010-08-05 12:59:07 -06002120static char elf_type(const Elf_Sym *sym, const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002121{
Rusty Russelleded41c2010-08-05 12:59:07 -06002122 const Elf_Shdr *sechdrs = info->sechdrs;
2123
Linus Torvalds1da177e2005-04-16 15:20:36 -07002124 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
2125 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
2126 return 'v';
2127 else
2128 return 'w';
2129 }
2130 if (sym->st_shndx == SHN_UNDEF)
2131 return 'U';
2132 if (sym->st_shndx == SHN_ABS)
2133 return 'a';
2134 if (sym->st_shndx >= SHN_LORESERVE)
2135 return '?';
2136 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
2137 return 't';
2138 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
2139 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
2140 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
2141 return 'r';
2142 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
2143 return 'g';
2144 else
2145 return 'd';
2146 }
2147 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
2148 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
2149 return 's';
2150 else
2151 return 'b';
2152 }
Rusty Russelleded41c2010-08-05 12:59:07 -06002153 if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name,
2154 ".debug")) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002155 return 'n';
Rusty Russelleded41c2010-08-05 12:59:07 -06002156 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002157 return '?';
2158}
2159
Jan Beulich4a496222009-07-06 14:50:42 +01002160static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
2161 unsigned int shnum)
2162{
2163 const Elf_Shdr *sec;
2164
2165 if (src->st_shndx == SHN_UNDEF
2166 || src->st_shndx >= shnum
2167 || !src->st_name)
2168 return false;
2169
2170 sec = sechdrs + src->st_shndx;
2171 if (!(sec->sh_flags & SHF_ALLOC)
2172#ifndef CONFIG_KALLSYMS_ALL
2173 || !(sec->sh_flags & SHF_EXECINSTR)
2174#endif
2175 || (sec->sh_entsize & INIT_OFFSET_MASK))
2176 return false;
2177
2178 return true;
2179}
2180
Rusty Russell49668682010-08-05 12:59:10 -06002181static void layout_symtab(struct module *mod, struct load_info *info)
Jan Beulich4a496222009-07-06 14:50:42 +01002182{
Rusty Russell49668682010-08-05 12:59:10 -06002183 Elf_Shdr *symsect = info->sechdrs + info->index.sym;
2184 Elf_Shdr *strsect = info->sechdrs + info->index.str;
Jan Beulich4a496222009-07-06 14:50:42 +01002185 const Elf_Sym *src;
2186 unsigned int i, nsrc, ndst;
2187
2188 /* Put symbol section at end of init part of module. */
2189 symsect->sh_flags |= SHF_ALLOC;
2190 symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
Rusty Russell49668682010-08-05 12:59:10 -06002191 info->index.sym) | INIT_OFFSET_MASK;
2192 DEBUGP("\t%s\n", info->secstrings + symsect->sh_name);
Jan Beulich4a496222009-07-06 14:50:42 +01002193
Rusty Russell49668682010-08-05 12:59:10 -06002194 src = (void *)info->hdr + symsect->sh_offset;
Jan Beulich4a496222009-07-06 14:50:42 +01002195 nsrc = symsect->sh_size / sizeof(*src);
2196 for (ndst = i = 1; i < nsrc; ++i, ++src)
Rusty Russell49668682010-08-05 12:59:10 -06002197 if (is_core_symbol(src, info->sechdrs, info->hdr->e_shnum)) {
Jan Beulich554bdfe2009-07-06 14:51:44 +01002198 unsigned int j = src->st_name;
2199
Rusty Russell49668682010-08-05 12:59:10 -06002200 while (!__test_and_set_bit(j, info->strmap)
2201 && info->strtab[j])
Jan Beulich554bdfe2009-07-06 14:51:44 +01002202 ++j;
Jan Beulich4a496222009-07-06 14:50:42 +01002203 ++ndst;
Jan Beulich554bdfe2009-07-06 14:51:44 +01002204 }
Jan Beulich4a496222009-07-06 14:50:42 +01002205
2206 /* Append room for core symbols at end of core part. */
Rusty Russell49668682010-08-05 12:59:10 -06002207 info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
2208 mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym);
Jan Beulich4a496222009-07-06 14:50:42 +01002209
Jan Beulich554bdfe2009-07-06 14:51:44 +01002210 /* Put string table section at end of init part of module. */
2211 strsect->sh_flags |= SHF_ALLOC;
2212 strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
Rusty Russell49668682010-08-05 12:59:10 -06002213 info->index.str) | INIT_OFFSET_MASK;
2214 DEBUGP("\t%s\n", info->secstrings + strsect->sh_name);
Jan Beulich554bdfe2009-07-06 14:51:44 +01002215
2216 /* Append room for core symbols' strings at end of core part. */
Rusty Russell49668682010-08-05 12:59:10 -06002217 info->stroffs = mod->core_size;
2218 __set_bit(0, info->strmap);
2219 mod->core_size += bitmap_weight(info->strmap, strsect->sh_size);
Jan Beulich4a496222009-07-06 14:50:42 +01002220}
2221
Rusty Russell811d66a2010-08-05 12:59:12 -06002222static void add_kallsyms(struct module *mod, const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002223{
Jan Beulich4a496222009-07-06 14:50:42 +01002224 unsigned int i, ndst;
2225 const Elf_Sym *src;
2226 Elf_Sym *dst;
Jan Beulich554bdfe2009-07-06 14:51:44 +01002227 char *s;
Rusty Russelleded41c2010-08-05 12:59:07 -06002228 Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002229
Rusty Russelleded41c2010-08-05 12:59:07 -06002230 mod->symtab = (void *)symsec->sh_addr;
2231 mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym);
Rusty Russell511ca6a2010-08-05 12:59:08 -06002232 /* Make sure we get permanent strtab: don't use info->strtab. */
2233 mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002234
2235 /* Set types up while we still have access to sections. */
2236 for (i = 0; i < mod->num_symtab; i++)
Rusty Russelleded41c2010-08-05 12:59:07 -06002237 mod->symtab[i].st_info = elf_type(&mod->symtab[i], info);
Jan Beulich4a496222009-07-06 14:50:42 +01002238
Rusty Russelld9131882010-08-05 12:59:08 -06002239 mod->core_symtab = dst = mod->module_core + info->symoffs;
Jan Beulich4a496222009-07-06 14:50:42 +01002240 src = mod->symtab;
2241 *dst = *src;
2242 for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) {
Rusty Russelleded41c2010-08-05 12:59:07 -06002243 if (!is_core_symbol(src, info->sechdrs, info->hdr->e_shnum))
Jan Beulich4a496222009-07-06 14:50:42 +01002244 continue;
2245 dst[ndst] = *src;
Rusty Russelld9131882010-08-05 12:59:08 -06002246 dst[ndst].st_name = bitmap_weight(info->strmap,
2247 dst[ndst].st_name);
Jan Beulich4a496222009-07-06 14:50:42 +01002248 ++ndst;
2249 }
2250 mod->core_num_syms = ndst;
Jan Beulich554bdfe2009-07-06 14:51:44 +01002251
Rusty Russelld9131882010-08-05 12:59:08 -06002252 mod->core_strtab = s = mod->module_core + info->stroffs;
Rusty Russelleded41c2010-08-05 12:59:07 -06002253 for (*s = 0, i = 1; i < info->sechdrs[info->index.str].sh_size; ++i)
Rusty Russelld9131882010-08-05 12:59:08 -06002254 if (test_bit(i, info->strmap))
Jan Beulich554bdfe2009-07-06 14:51:44 +01002255 *++s = mod->strtab[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002256}
2257#else
Rusty Russell49668682010-08-05 12:59:10 -06002258static inline void layout_symtab(struct module *mod, struct load_info *info)
Jan Beulich4a496222009-07-06 14:50:42 +01002259{
2260}
Paul Mundt3ae91c22009-10-01 15:43:54 -07002261
Michał Mirosławabbce902010-09-20 01:58:08 +02002262static void add_kallsyms(struct module *mod, const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002263{
2264}
2265#endif /* CONFIG_KALLSYMS */
2266
Jason Barone9d376f2009-02-05 11:51:38 -05002267static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
Rusty Russell5e458cc2008-10-22 10:00:13 -05002268{
Rusty Russell811d66a2010-08-05 12:59:12 -06002269 if (!debug)
2270 return;
Jason Barone9d376f2009-02-05 11:51:38 -05002271#ifdef CONFIG_DYNAMIC_DEBUG
2272 if (ddebug_add_module(debug, num, debug->modname))
2273 printk(KERN_ERR "dynamic debug error adding module: %s\n",
2274 debug->modname);
2275#endif
Rusty Russell5e458cc2008-10-22 10:00:13 -05002276}
Jason Baron346e15b2008-08-12 16:46:19 -04002277
Yehuda Sadehff49d742010-07-03 13:07:35 +10002278static void dynamic_debug_remove(struct _ddebug *debug)
2279{
2280 if (debug)
2281 ddebug_remove_module(debug->modname);
2282}
2283
Jonas Bonn74e08fc2011-06-30 21:22:11 +02002284void * __weak module_alloc(unsigned long size)
2285{
2286 return size == 0 ? NULL : vmalloc_exec(size);
2287}
2288
Rusty Russell3a642e92008-07-22 19:24:28 -05002289static void *module_alloc_update_bounds(unsigned long size)
2290{
2291 void *ret = module_alloc(size);
2292
2293 if (ret) {
Rusty Russell75676502010-06-05 11:17:36 -06002294 mutex_lock(&module_mutex);
Rusty Russell3a642e92008-07-22 19:24:28 -05002295 /* Update module bounds. */
2296 if ((unsigned long)ret < module_addr_min)
2297 module_addr_min = (unsigned long)ret;
2298 if ((unsigned long)ret + size > module_addr_max)
2299 module_addr_max = (unsigned long)ret + size;
Rusty Russell75676502010-06-05 11:17:36 -06002300 mutex_unlock(&module_mutex);
Rusty Russell3a642e92008-07-22 19:24:28 -05002301 }
2302 return ret;
2303}
2304
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002305#ifdef CONFIG_DEBUG_KMEMLEAK
Rusty Russell49668682010-08-05 12:59:10 -06002306static void kmemleak_load_module(const struct module *mod,
2307 const struct load_info *info)
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002308{
2309 unsigned int i;
2310
2311 /* only scan the sections containing data */
Catalin Marinasc017b4b2009-10-28 13:33:09 +00002312 kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002313
Rusty Russell49668682010-08-05 12:59:10 -06002314 for (i = 1; i < info->hdr->e_shnum; i++) {
2315 const char *name = info->secstrings + info->sechdrs[i].sh_name;
2316 if (!(info->sechdrs[i].sh_flags & SHF_ALLOC))
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002317 continue;
Rusty Russell49668682010-08-05 12:59:10 -06002318 if (!strstarts(name, ".data") && !strstarts(name, ".bss"))
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002319 continue;
2320
Rusty Russell49668682010-08-05 12:59:10 -06002321 kmemleak_scan_area((void *)info->sechdrs[i].sh_addr,
2322 info->sechdrs[i].sh_size, GFP_KERNEL);
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002323 }
2324}
2325#else
Rusty Russell49668682010-08-05 12:59:10 -06002326static inline void kmemleak_load_module(const struct module *mod,
2327 const struct load_info *info)
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002328{
2329}
2330#endif
2331
Rusty Russell6526c532010-08-05 12:59:10 -06002332/* Sets info->hdr and info->len. */
Rusty Russelld9131882010-08-05 12:59:08 -06002333static int copy_and_check(struct load_info *info,
2334 const void __user *umod, unsigned long len,
2335 const char __user *uargs)
Rusty Russell40dd2562010-08-05 12:59:03 -06002336{
2337 int err;
2338 Elf_Ehdr *hdr;
2339
2340 if (len < sizeof(*hdr))
2341 return -ENOEXEC;
2342
2343 /* Suck in entire file: we'll want most of it. */
2344 /* vmalloc barfs on "unusual" numbers. Check here */
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002345 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
Rusty Russell40dd2562010-08-05 12:59:03 -06002346 return -ENOMEM;
2347
2348 if (copy_from_user(hdr, umod, len) != 0) {
2349 err = -EFAULT;
2350 goto free_hdr;
2351 }
2352
2353 /* Sanity checks against insmoding binaries or wrong arch,
2354 weird elf version */
2355 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
2356 || hdr->e_type != ET_REL
2357 || !elf_check_arch(hdr)
2358 || hdr->e_shentsize != sizeof(Elf_Shdr)) {
2359 err = -ENOEXEC;
2360 goto free_hdr;
2361 }
2362
2363 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) {
2364 err = -ENOEXEC;
2365 goto free_hdr;
2366 }
Rusty Russelld9131882010-08-05 12:59:08 -06002367
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002368 info->hdr = hdr;
2369 info->len = len;
Rusty Russell40dd2562010-08-05 12:59:03 -06002370 return 0;
2371
2372free_hdr:
2373 vfree(hdr);
2374 return err;
2375}
2376
Rusty Russelld9131882010-08-05 12:59:08 -06002377static void free_copy(struct load_info *info)
2378{
Rusty Russelld9131882010-08-05 12:59:08 -06002379 vfree(info->hdr);
2380}
2381
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002382static int rewrite_section_headers(struct load_info *info)
2383{
2384 unsigned int i;
2385
2386 /* This should always be true, but let's be sure. */
2387 info->sechdrs[0].sh_addr = 0;
2388
2389 for (i = 1; i < info->hdr->e_shnum; i++) {
2390 Elf_Shdr *shdr = &info->sechdrs[i];
2391 if (shdr->sh_type != SHT_NOBITS
2392 && info->len < shdr->sh_offset + shdr->sh_size) {
2393 printk(KERN_ERR "Module len %lu truncated\n",
2394 info->len);
2395 return -ENOEXEC;
2396 }
2397
2398 /* Mark all sections sh_addr with their address in the
2399 temporary image. */
2400 shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset;
2401
2402#ifndef CONFIG_MODULE_UNLOAD
2403 /* Don't load .exit sections */
2404 if (strstarts(info->secstrings+shdr->sh_name, ".exit"))
2405 shdr->sh_flags &= ~(unsigned long)SHF_ALLOC;
2406#endif
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002407 }
Rusty Russelld6df72a2010-08-05 12:59:07 -06002408
2409 /* Track but don't keep modinfo and version sections. */
Rusty Russell49668682010-08-05 12:59:10 -06002410 info->index.vers = find_sec(info, "__versions");
2411 info->index.info = find_sec(info, ".modinfo");
Rusty Russelld6df72a2010-08-05 12:59:07 -06002412 info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC;
2413 info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC;
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002414 return 0;
2415}
2416
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002417/*
2418 * Set up our basic convenience variables (pointers to section headers,
2419 * search for module section index etc), and do some basic section
2420 * verification.
2421 *
2422 * Return the temporary module pointer (we'll replace it with the final
2423 * one when we move the module sections around).
2424 */
2425static struct module *setup_load_info(struct load_info *info)
2426{
2427 unsigned int i;
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002428 int err;
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002429 struct module *mod;
2430
2431 /* Set up the convenience variables */
2432 info->sechdrs = (void *)info->hdr + info->hdr->e_shoff;
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002433 info->secstrings = (void *)info->hdr
2434 + info->sechdrs[info->hdr->e_shstrndx].sh_offset;
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002435
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002436 err = rewrite_section_headers(info);
2437 if (err)
2438 return ERR_PTR(err);
2439
2440 /* Find internal symbols and strings. */
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002441 for (i = 1; i < info->hdr->e_shnum; i++) {
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002442 if (info->sechdrs[i].sh_type == SHT_SYMTAB) {
2443 info->index.sym = i;
2444 info->index.str = info->sechdrs[i].sh_link;
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002445 info->strtab = (char *)info->hdr
2446 + info->sechdrs[info->index.str].sh_offset;
2447 break;
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002448 }
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002449 }
2450
Rusty Russell49668682010-08-05 12:59:10 -06002451 info->index.mod = find_sec(info, ".gnu.linkonce.this_module");
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002452 if (!info->index.mod) {
2453 printk(KERN_WARNING "No module found in object\n");
2454 return ERR_PTR(-ENOEXEC);
2455 }
2456 /* This is temporary: point mod into copy of data. */
2457 mod = (void *)info->sechdrs[info->index.mod].sh_addr;
2458
2459 if (info->index.sym == 0) {
2460 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
2461 mod->name);
2462 return ERR_PTR(-ENOEXEC);
2463 }
2464
Rusty Russell49668682010-08-05 12:59:10 -06002465 info->index.pcpu = find_pcpusec(info);
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002466
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002467 /* Check module struct version now, before we try to use module. */
2468 if (!check_modstruct_version(info->sechdrs, info->index.vers, mod))
2469 return ERR_PTR(-ENOEXEC);
2470
2471 return mod;
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002472}
2473
Rusty Russell49668682010-08-05 12:59:10 -06002474static int check_modinfo(struct module *mod, struct load_info *info)
Rusty Russell40dd2562010-08-05 12:59:03 -06002475{
Rusty Russell49668682010-08-05 12:59:10 -06002476 const char *modmagic = get_modinfo(info, "vermagic");
Rusty Russell40dd2562010-08-05 12:59:03 -06002477 int err;
2478
2479 /* This is allowed: modprobe --force will invalidate it. */
2480 if (!modmagic) {
2481 err = try_to_force_load(mod, "bad vermagic");
2482 if (err)
2483 return err;
Rusty Russell49668682010-08-05 12:59:10 -06002484 } else if (!same_magic(modmagic, vermagic, info->index.vers)) {
Rusty Russell40dd2562010-08-05 12:59:03 -06002485 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
2486 mod->name, modmagic, vermagic);
2487 return -ENOEXEC;
2488 }
2489
Rusty Russell49668682010-08-05 12:59:10 -06002490 if (get_modinfo(info, "staging")) {
Rusty Russell40dd2562010-08-05 12:59:03 -06002491 add_taint_module(mod, TAINT_CRAP);
2492 printk(KERN_WARNING "%s: module is from the staging directory,"
2493 " the quality is unknown, you have been warned.\n",
2494 mod->name);
2495 }
Rusty Russell22e268e2010-08-05 12:59:05 -06002496
2497 /* Set up license info based on the info section */
Rusty Russell49668682010-08-05 12:59:10 -06002498 set_license(mod, get_modinfo(info, "license"));
Rusty Russell22e268e2010-08-05 12:59:05 -06002499
Rusty Russell40dd2562010-08-05 12:59:03 -06002500 return 0;
2501}
2502
Rusty Russell811d66a2010-08-05 12:59:12 -06002503static void find_module_sections(struct module *mod, struct load_info *info)
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002504{
Rusty Russell49668682010-08-05 12:59:10 -06002505 mod->kp = section_objs(info, "__param",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002506 sizeof(*mod->kp), &mod->num_kp);
Rusty Russell49668682010-08-05 12:59:10 -06002507 mod->syms = section_objs(info, "__ksymtab",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002508 sizeof(*mod->syms), &mod->num_syms);
Rusty Russell49668682010-08-05 12:59:10 -06002509 mod->crcs = section_addr(info, "__kcrctab");
2510 mod->gpl_syms = section_objs(info, "__ksymtab_gpl",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002511 sizeof(*mod->gpl_syms),
2512 &mod->num_gpl_syms);
Rusty Russell49668682010-08-05 12:59:10 -06002513 mod->gpl_crcs = section_addr(info, "__kcrctab_gpl");
2514 mod->gpl_future_syms = section_objs(info,
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002515 "__ksymtab_gpl_future",
2516 sizeof(*mod->gpl_future_syms),
2517 &mod->num_gpl_future_syms);
Rusty Russell49668682010-08-05 12:59:10 -06002518 mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future");
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002519
2520#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russell49668682010-08-05 12:59:10 -06002521 mod->unused_syms = section_objs(info, "__ksymtab_unused",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002522 sizeof(*mod->unused_syms),
2523 &mod->num_unused_syms);
Rusty Russell49668682010-08-05 12:59:10 -06002524 mod->unused_crcs = section_addr(info, "__kcrctab_unused");
2525 mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002526 sizeof(*mod->unused_gpl_syms),
2527 &mod->num_unused_gpl_syms);
Rusty Russell49668682010-08-05 12:59:10 -06002528 mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl");
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002529#endif
2530#ifdef CONFIG_CONSTRUCTORS
Rusty Russell49668682010-08-05 12:59:10 -06002531 mod->ctors = section_objs(info, ".ctors",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002532 sizeof(*mod->ctors), &mod->num_ctors);
2533#endif
2534
2535#ifdef CONFIG_TRACEPOINTS
Mathieu Desnoyers65498642011-01-26 17:26:22 -05002536 mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs",
2537 sizeof(*mod->tracepoints_ptrs),
2538 &mod->num_tracepoints);
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002539#endif
Jason Baronbf5438fc2010-09-17 11:09:00 -04002540#ifdef HAVE_JUMP_LABEL
2541 mod->jump_entries = section_objs(info, "__jump_table",
2542 sizeof(*mod->jump_entries),
2543 &mod->num_jump_entries);
2544#endif
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002545#ifdef CONFIG_EVENT_TRACING
Rusty Russell49668682010-08-05 12:59:10 -06002546 mod->trace_events = section_objs(info, "_ftrace_events",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002547 sizeof(*mod->trace_events),
2548 &mod->num_trace_events);
2549 /*
2550 * This section contains pointers to allocated objects in the trace
2551 * code and not scanning it leads to false positives.
2552 */
2553 kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
2554 mod->num_trace_events, GFP_KERNEL);
2555#endif
Steven Rostedt13b9b6e2010-11-10 22:19:24 -05002556#ifdef CONFIG_TRACING
2557 mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt",
2558 sizeof(*mod->trace_bprintk_fmt_start),
2559 &mod->num_trace_bprintk_fmt);
2560 /*
2561 * This section contains pointers to allocated objects in the trace
2562 * code and not scanning it leads to false positives.
2563 */
2564 kmemleak_scan_area(mod->trace_bprintk_fmt_start,
2565 sizeof(*mod->trace_bprintk_fmt_start) *
2566 mod->num_trace_bprintk_fmt, GFP_KERNEL);
2567#endif
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002568#ifdef CONFIG_FTRACE_MCOUNT_RECORD
2569 /* sechdrs[0].sh_size is always zero */
Rusty Russell49668682010-08-05 12:59:10 -06002570 mod->ftrace_callsites = section_objs(info, "__mcount_loc",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002571 sizeof(*mod->ftrace_callsites),
2572 &mod->num_ftrace_callsites);
2573#endif
Rusty Russell22e268e2010-08-05 12:59:05 -06002574
Rusty Russell811d66a2010-08-05 12:59:12 -06002575 mod->extable = section_objs(info, "__ex_table",
2576 sizeof(*mod->extable), &mod->num_exentries);
2577
Rusty Russell49668682010-08-05 12:59:10 -06002578 if (section_addr(info, "__obsparm"))
Rusty Russell22e268e2010-08-05 12:59:05 -06002579 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2580 mod->name);
Rusty Russell811d66a2010-08-05 12:59:12 -06002581
2582 info->debug = section_objs(info, "__verbose",
2583 sizeof(*info->debug), &info->num_debug);
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002584}
2585
Rusty Russell49668682010-08-05 12:59:10 -06002586static int move_module(struct module *mod, struct load_info *info)
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002587{
2588 int i;
2589 void *ptr;
2590
2591 /* Do the allocs. */
2592 ptr = module_alloc_update_bounds(mod->core_size);
2593 /*
2594 * The pointer to this block is stored in the module structure
2595 * which is inside the block. Just mark it as not being a
2596 * leak.
2597 */
2598 kmemleak_not_leak(ptr);
2599 if (!ptr)
Rusty Russelld9131882010-08-05 12:59:08 -06002600 return -ENOMEM;
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002601
2602 memset(ptr, 0, mod->core_size);
2603 mod->module_core = ptr;
2604
2605 ptr = module_alloc_update_bounds(mod->init_size);
2606 /*
2607 * The pointer to this block is stored in the module structure
2608 * which is inside the block. This block doesn't need to be
2609 * scanned as it contains data and code that will be freed
2610 * after the module is initialized.
2611 */
2612 kmemleak_ignore(ptr);
2613 if (!ptr && mod->init_size) {
2614 module_free(mod, mod->module_core);
Rusty Russelld9131882010-08-05 12:59:08 -06002615 return -ENOMEM;
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002616 }
2617 memset(ptr, 0, mod->init_size);
2618 mod->module_init = ptr;
2619
2620 /* Transfer each section which specifies SHF_ALLOC */
2621 DEBUGP("final section addresses:\n");
Rusty Russell49668682010-08-05 12:59:10 -06002622 for (i = 0; i < info->hdr->e_shnum; i++) {
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002623 void *dest;
Rusty Russell49668682010-08-05 12:59:10 -06002624 Elf_Shdr *shdr = &info->sechdrs[i];
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002625
Rusty Russell49668682010-08-05 12:59:10 -06002626 if (!(shdr->sh_flags & SHF_ALLOC))
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002627 continue;
2628
Rusty Russell49668682010-08-05 12:59:10 -06002629 if (shdr->sh_entsize & INIT_OFFSET_MASK)
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002630 dest = mod->module_init
Rusty Russell49668682010-08-05 12:59:10 -06002631 + (shdr->sh_entsize & ~INIT_OFFSET_MASK);
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002632 else
Rusty Russell49668682010-08-05 12:59:10 -06002633 dest = mod->module_core + shdr->sh_entsize;
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002634
Rusty Russell49668682010-08-05 12:59:10 -06002635 if (shdr->sh_type != SHT_NOBITS)
2636 memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size);
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002637 /* Update sh_addr to point to copy in image. */
Rusty Russell49668682010-08-05 12:59:10 -06002638 shdr->sh_addr = (unsigned long)dest;
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002639 DEBUGP("\t0x%lx %s\n",
Rusty Russell49668682010-08-05 12:59:10 -06002640 shdr->sh_addr, info->secstrings + shdr->sh_name);
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002641 }
Rusty Russelld9131882010-08-05 12:59:08 -06002642
2643 return 0;
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002644}
2645
Rusty Russell49668682010-08-05 12:59:10 -06002646static int check_module_license_and_versions(struct module *mod)
Rusty Russell22e268e2010-08-05 12:59:05 -06002647{
2648 /*
2649 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2650 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2651 * using GPL-only symbols it needs.
2652 */
2653 if (strcmp(mod->name, "ndiswrapper") == 0)
2654 add_taint(TAINT_PROPRIETARY_MODULE);
2655
2656 /* driverloader was caught wrongly pretending to be under GPL */
2657 if (strcmp(mod->name, "driverloader") == 0)
2658 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2659
2660#ifdef CONFIG_MODVERSIONS
2661 if ((mod->num_syms && !mod->crcs)
2662 || (mod->num_gpl_syms && !mod->gpl_crcs)
2663 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2664#ifdef CONFIG_UNUSED_SYMBOLS
2665 || (mod->num_unused_syms && !mod->unused_crcs)
2666 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2667#endif
2668 ) {
2669 return try_to_force_load(mod,
2670 "no versions for exported symbols");
2671 }
2672#endif
2673 return 0;
2674}
2675
2676static void flush_module_icache(const struct module *mod)
2677{
2678 mm_segment_t old_fs;
2679
2680 /* flush the icache in correct context */
2681 old_fs = get_fs();
2682 set_fs(KERNEL_DS);
2683
2684 /*
2685 * Flush the instruction cache, since we've played with text.
2686 * Do it before processing of module parameters, so the module
2687 * can provide parameter accessor functions of its own.
2688 */
2689 if (mod->module_init)
2690 flush_icache_range((unsigned long)mod->module_init,
2691 (unsigned long)mod->module_init
2692 + mod->init_size);
2693 flush_icache_range((unsigned long)mod->module_core,
2694 (unsigned long)mod->module_core + mod->core_size);
2695
2696 set_fs(old_fs);
2697}
2698
Jonas Bonn74e08fc2011-06-30 21:22:11 +02002699int __weak module_frob_arch_sections(Elf_Ehdr *hdr,
2700 Elf_Shdr *sechdrs,
2701 char *secstrings,
2702 struct module *mod)
2703{
2704 return 0;
2705}
2706
Rusty Russelld9131882010-08-05 12:59:08 -06002707static struct module *layout_and_allocate(struct load_info *info)
2708{
2709 /* Module within temporary copy. */
2710 struct module *mod;
Rusty Russell49668682010-08-05 12:59:10 -06002711 Elf_Shdr *pcpusec;
Rusty Russelld9131882010-08-05 12:59:08 -06002712 int err;
2713
2714 mod = setup_load_info(info);
2715 if (IS_ERR(mod))
2716 return mod;
2717
Rusty Russell49668682010-08-05 12:59:10 -06002718 err = check_modinfo(mod, info);
Rusty Russelld9131882010-08-05 12:59:08 -06002719 if (err)
2720 return ERR_PTR(err);
2721
2722 /* Allow arches to frob section contents and sizes. */
Rusty Russell49668682010-08-05 12:59:10 -06002723 err = module_frob_arch_sections(info->hdr, info->sechdrs,
2724 info->secstrings, mod);
Rusty Russelld9131882010-08-05 12:59:08 -06002725 if (err < 0)
Rusty Russell6526c532010-08-05 12:59:10 -06002726 goto out;
Rusty Russelld9131882010-08-05 12:59:08 -06002727
Rusty Russell49668682010-08-05 12:59:10 -06002728 pcpusec = &info->sechdrs[info->index.pcpu];
2729 if (pcpusec->sh_size) {
Rusty Russelld9131882010-08-05 12:59:08 -06002730 /* We have a special allocation for this section. */
Rusty Russell49668682010-08-05 12:59:10 -06002731 err = percpu_modalloc(mod,
2732 pcpusec->sh_size, pcpusec->sh_addralign);
Rusty Russelld9131882010-08-05 12:59:08 -06002733 if (err)
Rusty Russell6526c532010-08-05 12:59:10 -06002734 goto out;
Rusty Russell49668682010-08-05 12:59:10 -06002735 pcpusec->sh_flags &= ~(unsigned long)SHF_ALLOC;
Rusty Russelld9131882010-08-05 12:59:08 -06002736 }
2737
2738 /* Determine total sizes, and put offsets in sh_entsize. For now
2739 this is done generically; there doesn't appear to be any
2740 special cases for the architectures. */
Rusty Russell49668682010-08-05 12:59:10 -06002741 layout_sections(mod, info);
Rusty Russelld9131882010-08-05 12:59:08 -06002742
2743 info->strmap = kzalloc(BITS_TO_LONGS(info->sechdrs[info->index.str].sh_size)
2744 * sizeof(long), GFP_KERNEL);
2745 if (!info->strmap) {
2746 err = -ENOMEM;
2747 goto free_percpu;
2748 }
Rusty Russell49668682010-08-05 12:59:10 -06002749 layout_symtab(mod, info);
Rusty Russelld9131882010-08-05 12:59:08 -06002750
2751 /* Allocate and move to the final place */
Rusty Russell49668682010-08-05 12:59:10 -06002752 err = move_module(mod, info);
Rusty Russelld9131882010-08-05 12:59:08 -06002753 if (err)
2754 goto free_strmap;
2755
2756 /* Module has been copied to its final place now: return it. */
2757 mod = (void *)info->sechdrs[info->index.mod].sh_addr;
Rusty Russell49668682010-08-05 12:59:10 -06002758 kmemleak_load_module(mod, info);
Rusty Russelld9131882010-08-05 12:59:08 -06002759 return mod;
2760
2761free_strmap:
2762 kfree(info->strmap);
2763free_percpu:
2764 percpu_modfree(mod);
Rusty Russell6526c532010-08-05 12:59:10 -06002765out:
Rusty Russelld9131882010-08-05 12:59:08 -06002766 return ERR_PTR(err);
2767}
2768
2769/* mod is no longer valid after this! */
2770static void module_deallocate(struct module *mod, struct load_info *info)
2771{
2772 kfree(info->strmap);
2773 percpu_modfree(mod);
2774 module_free(mod, mod->module_init);
2775 module_free(mod, mod->module_core);
2776}
2777
Jonas Bonn74e08fc2011-06-30 21:22:11 +02002778int __weak module_finalize(const Elf_Ehdr *hdr,
2779 const Elf_Shdr *sechdrs,
2780 struct module *me)
2781{
2782 return 0;
2783}
2784
Rusty Russell811d66a2010-08-05 12:59:12 -06002785static int post_relocation(struct module *mod, const struct load_info *info)
2786{
Rusty Russell51f3d0f2010-08-05 12:59:13 -06002787 /* Sort exception table now relocations are done. */
Rusty Russell811d66a2010-08-05 12:59:12 -06002788 sort_extable(mod->extable, mod->extable + mod->num_exentries);
2789
2790 /* Copy relocated percpu area over. */
2791 percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr,
2792 info->sechdrs[info->index.pcpu].sh_size);
2793
Rusty Russell51f3d0f2010-08-05 12:59:13 -06002794 /* Setup kallsyms-specific fields. */
Rusty Russell811d66a2010-08-05 12:59:12 -06002795 add_kallsyms(mod, info);
2796
2797 /* Arch-specific module finalizing. */
2798 return module_finalize(info->hdr, info->sechdrs, mod);
2799}
2800
Linus Torvalds1da177e2005-04-16 15:20:36 -07002801/* Allocate and load the module: note that size of section 0 is always
2802 zero, and we rely on this for optional sections. */
Rusty Russell51f3d0f2010-08-05 12:59:13 -06002803static struct module *load_module(void __user *umod,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002804 unsigned long len,
2805 const char __user *uargs)
2806{
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002807 struct load_info info = { NULL, };
Linus Torvalds1da177e2005-04-16 15:20:36 -07002808 struct module *mod;
Rusty Russell40dd2562010-08-05 12:59:03 -06002809 long err;
Paul Mundt3ae91c22009-10-01 15:43:54 -07002810
Linus Torvalds1da177e2005-04-16 15:20:36 -07002811 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
2812 umod, len, uargs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002813
Rusty Russelld9131882010-08-05 12:59:08 -06002814 /* Copy in the blobs from userspace, check they are vaguely sane. */
2815 err = copy_and_check(&info, umod, len, uargs);
Rusty Russell40dd2562010-08-05 12:59:03 -06002816 if (err)
2817 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002818
Rusty Russelld9131882010-08-05 12:59:08 -06002819 /* Figure out module layout, and allocate all the memory. */
2820 mod = layout_and_allocate(&info);
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002821 if (IS_ERR(mod)) {
2822 err = PTR_ERR(mod);
Rusty Russelld9131882010-08-05 12:59:08 -06002823 goto free_copy;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002824 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002825
Rusty Russell49668682010-08-05 12:59:10 -06002826 /* Now module is in final location, initialize linked lists, etc. */
Rusty Russell9f85a4b2010-08-05 12:59:04 -06002827 err = module_unload_init(mod);
2828 if (err)
Rusty Russelld9131882010-08-05 12:59:08 -06002829 goto free_module;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002830
Rusty Russell22e268e2010-08-05 12:59:05 -06002831 /* Now we've got everything in the final locations, we can
2832 * find optional sections. */
Rusty Russell49668682010-08-05 12:59:10 -06002833 find_module_sections(mod, &info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002834
Rusty Russell49668682010-08-05 12:59:10 -06002835 err = check_module_license_and_versions(mod);
Rusty Russell22e268e2010-08-05 12:59:05 -06002836 if (err)
2837 goto free_unload;
Dave Jones9841d612006-01-08 01:03:41 -08002838
Matt Domschc988d2b2005-06-23 22:05:15 -07002839 /* Set up MODINFO_ATTR fields */
Rusty Russell49668682010-08-05 12:59:10 -06002840 setup_modinfo(mod, &info);
Matt Domschc988d2b2005-06-23 22:05:15 -07002841
Linus Torvalds1da177e2005-04-16 15:20:36 -07002842 /* Fix up syms, so that st_value is a pointer to location. */
Rusty Russell49668682010-08-05 12:59:10 -06002843 err = simplify_symbols(mod, &info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002844 if (err < 0)
Rusty Russelld9131882010-08-05 12:59:08 -06002845 goto free_modinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002846
Rusty Russell49668682010-08-05 12:59:10 -06002847 err = apply_relocations(mod, &info);
Rusty Russell22e268e2010-08-05 12:59:05 -06002848 if (err < 0)
Rusty Russelld9131882010-08-05 12:59:08 -06002849 goto free_modinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002850
Rusty Russell811d66a2010-08-05 12:59:12 -06002851 err = post_relocation(mod, &info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002852 if (err < 0)
Rusty Russelld9131882010-08-05 12:59:08 -06002853 goto free_modinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002854
Rusty Russell22e268e2010-08-05 12:59:05 -06002855 flush_module_icache(mod);
Thomas Koeller378bac82005-09-06 15:17:11 -07002856
Rusty Russell6526c532010-08-05 12:59:10 -06002857 /* Now copy in args */
2858 mod->args = strndup_user(uargs, ~0UL >> 1);
2859 if (IS_ERR(mod->args)) {
2860 err = PTR_ERR(mod->args);
2861 goto free_arch_cleanup;
2862 }
Rusty Russell8d3b33f2006-03-25 03:07:05 -08002863
Rusty Russell51f3d0f2010-08-05 12:59:13 -06002864 /* Mark state as coming so strong_try_module_get() ignores us. */
Rusty Russelld9131882010-08-05 12:59:08 -06002865 mod->state = MODULE_STATE_COMING;
2866
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002867 /* Now sew it into the lists so we can get lockdep and oops
Lucas De Marchi25985ed2011-03-30 22:57:33 -03002868 * info during argument parsing. No one should access us, since
Andi Kleend72b3752008-08-30 10:09:00 +02002869 * strong_try_module_get() will fail.
2870 * lockdep/oops can run asynchronous, so use the RCU list insertion
2871 * function to insert in a way safe to concurrent readers.
2872 * The mutex protects against concurrent writers.
2873 */
Rusty Russell75676502010-06-05 11:17:36 -06002874 mutex_lock(&module_mutex);
Linus Torvalds3bafeb62010-06-05 11:17:36 -06002875 if (find_module(mod->name)) {
2876 err = -EEXIST;
Rusty Russellbe593f42010-06-05 11:17:37 -06002877 goto unlock;
Linus Torvalds3bafeb62010-06-05 11:17:36 -06002878 }
2879
Rusty Russell811d66a2010-08-05 12:59:12 -06002880 /* This has to be done once we're sure module name is unique. */
Roland Vossen7816c452011-04-07 11:20:58 +02002881 if (!mod->taints || mod->taints == (1U<<TAINT_CRAP))
Rusty Russell811d66a2010-08-05 12:59:12 -06002882 dynamic_debug_setup(info.debug, info.num_debug);
Yehuda Sadehff49d742010-07-03 13:07:35 +10002883
Rusty Russellbe593f42010-06-05 11:17:37 -06002884 /* Find duplicate symbols */
2885 err = verify_export_symbols(mod);
2886 if (err < 0)
Yehuda Sadehff49d742010-07-03 13:07:35 +10002887 goto ddebug;
Rusty Russellbe593f42010-06-05 11:17:37 -06002888
Linus Torvalds53363772010-10-05 11:29:27 -07002889 module_bug_finalize(info.hdr, info.sechdrs, mod);
Andi Kleend72b3752008-08-30 10:09:00 +02002890 list_add_rcu(&mod->list, &modules);
Rusty Russell75676502010-06-05 11:17:36 -06002891 mutex_unlock(&module_mutex);
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002892
Rusty Russell51f3d0f2010-08-05 12:59:13 -06002893 /* Module is ready to execute: parsing args may do that. */
Rusty Russelle180a6b2009-03-31 13:05:29 -06002894 err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002895 if (err < 0)
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002896 goto unlink;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002897
Rusty Russell51f3d0f2010-08-05 12:59:13 -06002898 /* Link in to syfs. */
Rusty Russell8f6d0372010-08-05 12:59:09 -06002899 err = mod_sysfs_setup(mod, &info, mod->kp, mod->num_kp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002900 if (err < 0)
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002901 goto unlink;
Rusty Russell80a3d1b2010-06-05 11:17:36 -06002902
Rusty Russelld9131882010-08-05 12:59:08 -06002903 /* Get rid of temporary copy and strmap. */
2904 kfree(info.strmap);
2905 free_copy(&info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002906
2907 /* Done! */
Rusty Russell51f3d0f2010-08-05 12:59:13 -06002908 trace_module_load(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002909 return mod;
2910
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002911 unlink:
Rusty Russell75676502010-06-05 11:17:36 -06002912 mutex_lock(&module_mutex);
Rusty Russelle91defa2009-03-31 13:05:35 -06002913 /* Unlink carefully: kallsyms could be walking list. */
2914 list_del_rcu(&mod->list);
Linus Torvalds53363772010-10-05 11:29:27 -07002915 module_bug_cleanup(mod);
2916
Yehuda Sadehff49d742010-07-03 13:07:35 +10002917 ddebug:
Roland Vossen7816c452011-04-07 11:20:58 +02002918 if (!mod->taints || mod->taints == (1U<<TAINT_CRAP))
Rusty Russell811d66a2010-08-05 12:59:12 -06002919 dynamic_debug_remove(info.debug);
Rusty Russellbe593f42010-06-05 11:17:37 -06002920 unlock:
Rusty Russell75676502010-06-05 11:17:36 -06002921 mutex_unlock(&module_mutex);
Rusty Russelle91defa2009-03-31 13:05:35 -06002922 synchronize_sched();
Rusty Russell6526c532010-08-05 12:59:10 -06002923 kfree(mod->args);
2924 free_arch_cleanup:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002925 module_arch_cleanup(mod);
Rusty Russelld9131882010-08-05 12:59:08 -06002926 free_modinfo:
Rusty Russella263f772009-09-25 00:32:58 -06002927 free_modinfo(mod);
Rusty Russell22e268e2010-08-05 12:59:05 -06002928 free_unload:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002929 module_unload_free(mod);
Rusty Russelld9131882010-08-05 12:59:08 -06002930 free_module:
2931 module_deallocate(mod, &info);
2932 free_copy:
2933 free_copy(&info);
Jayachandran C6fe2e702006-01-06 00:19:54 -08002934 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002935}
2936
Peter Oberparleiterb99b87f2009-06-17 16:28:03 -07002937/* Call module constructors. */
2938static void do_mod_ctors(struct module *mod)
2939{
2940#ifdef CONFIG_CONSTRUCTORS
2941 unsigned long i;
2942
2943 for (i = 0; i < mod->num_ctors; i++)
2944 mod->ctors[i]();
2945#endif
2946}
2947
Linus Torvalds1da177e2005-04-16 15:20:36 -07002948/* This is where the real work happens */
Heiko Carstens17da2bd2009-01-14 14:14:10 +01002949SYSCALL_DEFINE3(init_module, void __user *, umod,
2950 unsigned long, len, const char __user *, uargs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002951{
2952 struct module *mod;
2953 int ret = 0;
2954
2955 /* Must have permission */
Kees Cook3d433212009-04-02 15:49:29 -07002956 if (!capable(CAP_SYS_MODULE) || modules_disabled)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002957 return -EPERM;
2958
Linus Torvalds1da177e2005-04-16 15:20:36 -07002959 /* Do all the hard work */
2960 mod = load_module(umod, len, uargs);
Rusty Russell75676502010-06-05 11:17:36 -06002961 if (IS_ERR(mod))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002962 return PTR_ERR(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002963
Alan Sterne041c682006-03-27 01:16:30 -08002964 blocking_notifier_call_chain(&module_notify_list,
2965 MODULE_STATE_COMING, mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002966
Steven Rostedt94462ad2010-11-29 13:15:42 -05002967 /* Set RO and NX regions for core */
2968 set_section_ro_nx(mod->module_core,
2969 mod->core_text_size,
2970 mod->core_ro_size,
2971 mod->core_size);
2972
2973 /* Set RO and NX regions for init */
2974 set_section_ro_nx(mod->module_init,
2975 mod->init_text_size,
2976 mod->init_ro_size,
2977 mod->init_size);
2978
Peter Oberparleiterb99b87f2009-06-17 16:28:03 -07002979 do_mod_ctors(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002980 /* Start the module */
2981 if (mod->init != NULL)
Arjan van de Ven59f94152008-07-30 12:49:02 -07002982 ret = do_one_initcall(mod->init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002983 if (ret < 0) {
2984 /* Init routine failed: abort. Try to protect us from
2985 buggy refcounters. */
2986 mod->state = MODULE_STATE_GOING;
Paul E. McKenneyfbd568a3e2005-05-01 08:59:04 -07002987 synchronize_sched();
Rusty Russellaf49d922007-10-16 23:26:27 -07002988 module_put(mod);
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +02002989 blocking_notifier_call_chain(&module_notify_list,
2990 MODULE_STATE_GOING, mod);
Rusty Russellaf49d922007-10-16 23:26:27 -07002991 free_module(mod);
Rusty Russellc9a3ba52008-01-29 17:13:18 -05002992 wake_up(&module_wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002993 return ret;
2994 }
Alexey Dobriyane24e2e62008-03-10 11:43:53 -07002995 if (ret > 0) {
Joe Perchesad361c92009-07-06 13:05:40 -07002996 printk(KERN_WARNING
2997"%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
2998"%s: loading module anyway...\n",
Alexey Dobriyane24e2e62008-03-10 11:43:53 -07002999 __func__, mod->name, ret,
3000 __func__);
3001 dump_stack();
3002 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003003
Rusty Russell6c5db222008-03-10 11:43:52 -07003004 /* Now it's a first class citizen! Wake up anyone waiting for it. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003005 mod->state = MODULE_STATE_LIVE;
Rusty Russell6c5db222008-03-10 11:43:52 -07003006 wake_up(&module_wq);
Masami Hiramatsu0deddf42009-01-06 14:41:54 -08003007 blocking_notifier_call_chain(&module_notify_list,
3008 MODULE_STATE_LIVE, mod);
Rusty Russell6c5db222008-03-10 11:43:52 -07003009
Linus Torvaldsd6de2c82009-04-10 12:17:41 -07003010 /* We need to finish all async code before the module init sequence is done */
3011 async_synchronize_full();
3012
Rusty Russell6c5db222008-03-10 11:43:52 -07003013 mutex_lock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003014 /* Drop initial reference. */
3015 module_put(mod);
Rusty Russellad6561d2009-06-12 21:47:03 -06003016 trim_init_extable(mod);
Jan Beulich4a496222009-07-06 14:50:42 +01003017#ifdef CONFIG_KALLSYMS
3018 mod->num_symtab = mod->core_num_syms;
3019 mod->symtab = mod->core_symtab;
Jan Beulich554bdfe2009-07-06 14:51:44 +01003020 mod->strtab = mod->core_strtab;
Jan Beulich4a496222009-07-06 14:50:42 +01003021#endif
Jan Glauber01526ed2011-05-19 16:55:26 -06003022 unset_module_init_ro_nx(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003023 module_free(mod, mod->module_init);
3024 mod->module_init = NULL;
3025 mod->init_size = 0;
Jan Glauber4d103802011-05-19 16:55:25 -06003026 mod->init_ro_size = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003027 mod->init_text_size = 0;
Ashutosh Naik6389a382006-03-23 03:00:46 -08003028 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003029
3030 return 0;
3031}
3032
3033static inline int within(unsigned long addr, void *start, unsigned long size)
3034{
3035 return ((void *)addr >= start && (void *)addr < start + size);
3036}
3037
3038#ifdef CONFIG_KALLSYMS
3039/*
3040 * This ignores the intensely annoying "mapping symbols" found
3041 * in ARM ELF files: $a, $t and $d.
3042 */
3043static inline int is_arm_mapping_symbol(const char *str)
3044{
Daniel Walker22a8bde2007-10-18 03:06:07 -07003045 return str[0] == '$' && strchr("atd", str[1])
Linus Torvalds1da177e2005-04-16 15:20:36 -07003046 && (str[2] == '\0' || str[2] == '.');
3047}
3048
3049static const char *get_ksymbol(struct module *mod,
3050 unsigned long addr,
3051 unsigned long *size,
3052 unsigned long *offset)
3053{
3054 unsigned int i, best = 0;
3055 unsigned long nextval;
3056
3057 /* At worse, next value is at end of module */
Masami Hiramatsua06f6212009-01-06 14:41:49 -08003058 if (within_module_init(addr, mod))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003059 nextval = (unsigned long)mod->module_init+mod->init_text_size;
Daniel Walker22a8bde2007-10-18 03:06:07 -07003060 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07003061 nextval = (unsigned long)mod->module_core+mod->core_text_size;
3062
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003063 /* Scan for closest preceding symbol, and next symbol. (ELF
Daniel Walker22a8bde2007-10-18 03:06:07 -07003064 starts real symbols at 1). */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003065 for (i = 1; i < mod->num_symtab; i++) {
3066 if (mod->symtab[i].st_shndx == SHN_UNDEF)
3067 continue;
3068
3069 /* We ignore unnamed symbols: they're uninformative
3070 * and inserted at a whim. */
3071 if (mod->symtab[i].st_value <= addr
3072 && mod->symtab[i].st_value > mod->symtab[best].st_value
3073 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
3074 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
3075 best = i;
3076 if (mod->symtab[i].st_value > addr
3077 && mod->symtab[i].st_value < nextval
3078 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
3079 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
3080 nextval = mod->symtab[i].st_value;
3081 }
3082
3083 if (!best)
3084 return NULL;
3085
Alexey Dobriyanffb45122007-05-08 00:28:41 -07003086 if (size)
3087 *size = nextval - mod->symtab[best].st_value;
3088 if (offset)
3089 *offset = addr - mod->symtab[best].st_value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003090 return mod->strtab + mod->symtab[best].st_name;
3091}
3092
Rusty Russell6dd06c92008-01-29 17:13:22 -05003093/* For kallsyms to ask for address resolution. NULL means not found. Careful
3094 * not to lock to avoid deadlock on oopses, simply disable preemption. */
Andrew Morton92dfc9d2008-02-08 04:18:43 -08003095const char *module_address_lookup(unsigned long addr,
Rusty Russell6dd06c92008-01-29 17:13:22 -05003096 unsigned long *size,
3097 unsigned long *offset,
3098 char **modname,
3099 char *namebuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003100{
3101 struct module *mod;
Rusty Russellcb2a5202008-01-14 00:55:03 -08003102 const char *ret = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003103
Rusty Russellcb2a5202008-01-14 00:55:03 -08003104 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02003105 list_for_each_entry_rcu(mod, &modules, list) {
Masami Hiramatsua06f6212009-01-06 14:41:49 -08003106 if (within_module_init(addr, mod) ||
3107 within_module_core(addr, mod)) {
Franck Bui-Huuffc50892006-10-03 01:13:48 -07003108 if (modname)
3109 *modname = mod->name;
Rusty Russellcb2a5202008-01-14 00:55:03 -08003110 ret = get_ksymbol(mod, addr, size, offset);
3111 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003112 }
3113 }
Rusty Russell6dd06c92008-01-29 17:13:22 -05003114 /* Make a copy in here where it's safe */
3115 if (ret) {
3116 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
3117 ret = namebuf;
3118 }
Rusty Russellcb2a5202008-01-14 00:55:03 -08003119 preempt_enable();
Andrew Morton92dfc9d2008-02-08 04:18:43 -08003120 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003121}
3122
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07003123int lookup_module_symbol_name(unsigned long addr, char *symname)
3124{
3125 struct module *mod;
3126
Rusty Russellcb2a5202008-01-14 00:55:03 -08003127 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02003128 list_for_each_entry_rcu(mod, &modules, list) {
Masami Hiramatsua06f6212009-01-06 14:41:49 -08003129 if (within_module_init(addr, mod) ||
3130 within_module_core(addr, mod)) {
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07003131 const char *sym;
3132
3133 sym = get_ksymbol(mod, addr, NULL, NULL);
3134 if (!sym)
3135 goto out;
Tejun Heo9281ace2007-07-17 04:03:51 -07003136 strlcpy(symname, sym, KSYM_NAME_LEN);
Rusty Russellcb2a5202008-01-14 00:55:03 -08003137 preempt_enable();
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07003138 return 0;
3139 }
3140 }
3141out:
Rusty Russellcb2a5202008-01-14 00:55:03 -08003142 preempt_enable();
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07003143 return -ERANGE;
3144}
3145
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07003146int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
3147 unsigned long *offset, char *modname, char *name)
3148{
3149 struct module *mod;
3150
Rusty Russellcb2a5202008-01-14 00:55:03 -08003151 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02003152 list_for_each_entry_rcu(mod, &modules, list) {
Masami Hiramatsua06f6212009-01-06 14:41:49 -08003153 if (within_module_init(addr, mod) ||
3154 within_module_core(addr, mod)) {
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07003155 const char *sym;
3156
3157 sym = get_ksymbol(mod, addr, size, offset);
3158 if (!sym)
3159 goto out;
3160 if (modname)
Tejun Heo9281ace2007-07-17 04:03:51 -07003161 strlcpy(modname, mod->name, MODULE_NAME_LEN);
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07003162 if (name)
Tejun Heo9281ace2007-07-17 04:03:51 -07003163 strlcpy(name, sym, KSYM_NAME_LEN);
Rusty Russellcb2a5202008-01-14 00:55:03 -08003164 preempt_enable();
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07003165 return 0;
3166 }
3167 }
3168out:
Rusty Russellcb2a5202008-01-14 00:55:03 -08003169 preempt_enable();
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07003170 return -ERANGE;
3171}
3172
Alexey Dobriyanea078902007-05-08 00:28:39 -07003173int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
3174 char *name, char *module_name, int *exported)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003175{
3176 struct module *mod;
3177
Rusty Russellcb2a5202008-01-14 00:55:03 -08003178 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02003179 list_for_each_entry_rcu(mod, &modules, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003180 if (symnum < mod->num_symtab) {
3181 *value = mod->symtab[symnum].st_value;
3182 *type = mod->symtab[symnum].st_info;
Andreas Gruenbacher098c5ee2006-07-14 00:24:04 -07003183 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
Tejun Heo9281ace2007-07-17 04:03:51 -07003184 KSYM_NAME_LEN);
3185 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
Tim Abbottca4787b2009-01-05 08:40:10 -06003186 *exported = is_exported(name, *value, mod);
Rusty Russellcb2a5202008-01-14 00:55:03 -08003187 preempt_enable();
Alexey Dobriyanea078902007-05-08 00:28:39 -07003188 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003189 }
3190 symnum -= mod->num_symtab;
3191 }
Rusty Russellcb2a5202008-01-14 00:55:03 -08003192 preempt_enable();
Alexey Dobriyanea078902007-05-08 00:28:39 -07003193 return -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003194}
3195
3196static unsigned long mod_find_symname(struct module *mod, const char *name)
3197{
3198 unsigned int i;
3199
3200 for (i = 0; i < mod->num_symtab; i++)
Keith Owens54e8ce42006-02-03 03:03:53 -08003201 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
3202 mod->symtab[i].st_info != 'U')
Linus Torvalds1da177e2005-04-16 15:20:36 -07003203 return mod->symtab[i].st_value;
3204 return 0;
3205}
3206
3207/* Look for this name: can be of form module:name. */
3208unsigned long module_kallsyms_lookup_name(const char *name)
3209{
3210 struct module *mod;
3211 char *colon;
3212 unsigned long ret = 0;
3213
3214 /* Don't lock: we're in enough trouble already. */
Rusty Russellcb2a5202008-01-14 00:55:03 -08003215 preempt_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003216 if ((colon = strchr(name, ':')) != NULL) {
3217 *colon = '\0';
3218 if ((mod = find_module(name)) != NULL)
3219 ret = mod_find_symname(mod, colon+1);
3220 *colon = ':';
3221 } else {
Andi Kleend72b3752008-08-30 10:09:00 +02003222 list_for_each_entry_rcu(mod, &modules, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003223 if ((ret = mod_find_symname(mod, name)) != 0)
3224 break;
3225 }
Rusty Russellcb2a5202008-01-14 00:55:03 -08003226 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003227 return ret;
3228}
Anders Kaseorg75a66612008-12-05 19:03:58 -05003229
3230int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
3231 struct module *, unsigned long),
3232 void *data)
3233{
3234 struct module *mod;
3235 unsigned int i;
3236 int ret;
3237
3238 list_for_each_entry(mod, &modules, list) {
3239 for (i = 0; i < mod->num_symtab; i++) {
3240 ret = fn(data, mod->strtab + mod->symtab[i].st_name,
3241 mod, mod->symtab[i].st_value);
3242 if (ret != 0)
3243 return ret;
3244 }
3245 }
3246 return 0;
3247}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003248#endif /* CONFIG_KALLSYMS */
3249
Arjan van de Ven21aa9282008-01-25 21:08:33 +01003250static char *module_flags(struct module *mod, char *buf)
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003251{
3252 int bx = 0;
3253
Arjan van de Ven21aa9282008-01-25 21:08:33 +01003254 if (mod->taints ||
3255 mod->state == MODULE_STATE_GOING ||
3256 mod->state == MODULE_STATE_COMING) {
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003257 buf[bx++] = '(';
Andi Kleen25ddbb12008-10-15 22:01:41 -07003258 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003259 buf[bx++] = 'P';
Andi Kleen25ddbb12008-10-15 22:01:41 -07003260 if (mod->taints & (1 << TAINT_FORCED_MODULE))
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003261 buf[bx++] = 'F';
Linus Torvalds26e9a392008-10-17 09:50:12 -07003262 if (mod->taints & (1 << TAINT_CRAP))
Greg Kroah-Hartman061b1bd2008-09-24 14:46:44 -07003263 buf[bx++] = 'C';
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003264 /*
3265 * TAINT_FORCED_RMMOD: could be added.
3266 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
3267 * apply to modules.
3268 */
Arjan van de Ven21aa9282008-01-25 21:08:33 +01003269
3270 /* Show a - for module-is-being-unloaded */
3271 if (mod->state == MODULE_STATE_GOING)
3272 buf[bx++] = '-';
3273 /* Show a + for module-is-being-loaded */
3274 if (mod->state == MODULE_STATE_COMING)
3275 buf[bx++] = '+';
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003276 buf[bx++] = ')';
3277 }
3278 buf[bx] = '\0';
3279
3280 return buf;
3281}
3282
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +04003283#ifdef CONFIG_PROC_FS
3284/* Called by the /proc file system to return a list of modules. */
3285static void *m_start(struct seq_file *m, loff_t *pos)
3286{
3287 mutex_lock(&module_mutex);
3288 return seq_list_start(&modules, *pos);
3289}
3290
3291static void *m_next(struct seq_file *m, void *p, loff_t *pos)
3292{
3293 return seq_list_next(p, &modules, pos);
3294}
3295
3296static void m_stop(struct seq_file *m, void *p)
3297{
3298 mutex_unlock(&module_mutex);
3299}
3300
Linus Torvalds1da177e2005-04-16 15:20:36 -07003301static int m_show(struct seq_file *m, void *p)
3302{
3303 struct module *mod = list_entry(p, struct module, list);
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003304 char buf[8];
3305
Denys Vlasenko2f0f2a32008-07-22 19:24:27 -05003306 seq_printf(m, "%s %u",
Linus Torvalds1da177e2005-04-16 15:20:36 -07003307 mod->name, mod->init_size + mod->core_size);
3308 print_unload_info(m, mod);
3309
3310 /* Informative for users. */
3311 seq_printf(m, " %s",
3312 mod->state == MODULE_STATE_GOING ? "Unloading":
3313 mod->state == MODULE_STATE_COMING ? "Loading":
3314 "Live");
3315 /* Used by oprofile and other similar tools. */
Kees Cook9f36e2c2011-03-22 16:34:22 -07003316 seq_printf(m, " 0x%pK", mod->module_core);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003317
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003318 /* Taints info */
3319 if (mod->taints)
Arjan van de Ven21aa9282008-01-25 21:08:33 +01003320 seq_printf(m, " %s", module_flags(mod, buf));
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003321
Linus Torvalds1da177e2005-04-16 15:20:36 -07003322 seq_printf(m, "\n");
3323 return 0;
3324}
3325
3326/* Format: modulename size refcount deps address
3327
3328 Where refcount is a number or -, and deps is a comma-separated list
3329 of depends or -.
3330*/
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +04003331static const struct seq_operations modules_op = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003332 .start = m_start,
3333 .next = m_next,
3334 .stop = m_stop,
3335 .show = m_show
3336};
3337
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +04003338static int modules_open(struct inode *inode, struct file *file)
3339{
3340 return seq_open(file, &modules_op);
3341}
3342
3343static const struct file_operations proc_modules_operations = {
3344 .open = modules_open,
3345 .read = seq_read,
3346 .llseek = seq_lseek,
3347 .release = seq_release,
3348};
3349
3350static int __init proc_modules_init(void)
3351{
3352 proc_create("modules", 0, NULL, &proc_modules_operations);
3353 return 0;
3354}
3355module_init(proc_modules_init);
3356#endif
3357
Linus Torvalds1da177e2005-04-16 15:20:36 -07003358/* Given an address, look for it in the module exception tables. */
3359const struct exception_table_entry *search_module_extables(unsigned long addr)
3360{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003361 const struct exception_table_entry *e = NULL;
3362 struct module *mod;
3363
Rusty Russell24da1cb2007-07-15 23:41:46 -07003364 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02003365 list_for_each_entry_rcu(mod, &modules, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003366 if (mod->num_exentries == 0)
3367 continue;
Daniel Walker22a8bde2007-10-18 03:06:07 -07003368
Linus Torvalds1da177e2005-04-16 15:20:36 -07003369 e = search_extable(mod->extable,
3370 mod->extable + mod->num_exentries - 1,
3371 addr);
3372 if (e)
3373 break;
3374 }
Rusty Russell24da1cb2007-07-15 23:41:46 -07003375 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003376
3377 /* Now, if we found one, we are running inside it now, hence
Daniel Walker22a8bde2007-10-18 03:06:07 -07003378 we cannot unload the module, hence no refcnt needed. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003379 return e;
3380}
3381
Ingo Molnar4d435f92006-07-03 00:24:24 -07003382/*
Rusty Russelle6104992009-03-31 13:05:31 -06003383 * is_module_address - is this address inside a module?
3384 * @addr: the address to check.
3385 *
3386 * See is_module_text_address() if you simply want to see if the address
3387 * is code (not data).
Ingo Molnar4d435f92006-07-03 00:24:24 -07003388 */
Rusty Russelle6104992009-03-31 13:05:31 -06003389bool is_module_address(unsigned long addr)
Ingo Molnar4d435f92006-07-03 00:24:24 -07003390{
Rusty Russelle6104992009-03-31 13:05:31 -06003391 bool ret;
Ingo Molnar4d435f92006-07-03 00:24:24 -07003392
Rusty Russell24da1cb2007-07-15 23:41:46 -07003393 preempt_disable();
Rusty Russelle6104992009-03-31 13:05:31 -06003394 ret = __module_address(addr) != NULL;
Rusty Russell24da1cb2007-07-15 23:41:46 -07003395 preempt_enable();
Ingo Molnar4d435f92006-07-03 00:24:24 -07003396
Rusty Russelle6104992009-03-31 13:05:31 -06003397 return ret;
Ingo Molnar4d435f92006-07-03 00:24:24 -07003398}
3399
Rusty Russelle6104992009-03-31 13:05:31 -06003400/*
3401 * __module_address - get the module which contains an address.
3402 * @addr: the address.
3403 *
3404 * Must be called with preempt disabled or module mutex held so that
3405 * module doesn't get freed during this.
3406 */
Linus Torvalds714f83d2009-04-05 11:04:19 -07003407struct module *__module_address(unsigned long addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003408{
3409 struct module *mod;
3410
Rusty Russell3a642e92008-07-22 19:24:28 -05003411 if (addr < module_addr_min || addr > module_addr_max)
3412 return NULL;
3413
Andi Kleend72b3752008-08-30 10:09:00 +02003414 list_for_each_entry_rcu(mod, &modules, list)
Rusty Russelle6104992009-03-31 13:05:31 -06003415 if (within_module_core(addr, mod)
3416 || within_module_init(addr, mod))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003417 return mod;
3418 return NULL;
3419}
Tim Abbottc6b37802008-12-05 19:03:59 -05003420EXPORT_SYMBOL_GPL(__module_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003421
Rusty Russelle6104992009-03-31 13:05:31 -06003422/*
3423 * is_module_text_address - is this address inside module code?
3424 * @addr: the address to check.
3425 *
3426 * See is_module_address() if you simply want to see if the address is
3427 * anywhere in a module. See kernel_text_address() for testing if an
3428 * address corresponds to kernel or module code.
3429 */
3430bool is_module_text_address(unsigned long addr)
3431{
3432 bool ret;
3433
3434 preempt_disable();
3435 ret = __module_text_address(addr) != NULL;
3436 preempt_enable();
3437
3438 return ret;
3439}
3440
3441/*
3442 * __module_text_address - get the module whose code contains an address.
3443 * @addr: the address.
3444 *
3445 * Must be called with preempt disabled or module mutex held so that
3446 * module doesn't get freed during this.
3447 */
3448struct module *__module_text_address(unsigned long addr)
3449{
3450 struct module *mod = __module_address(addr);
3451 if (mod) {
3452 /* Make sure it's within the text section. */
3453 if (!within(addr, mod->module_init, mod->init_text_size)
3454 && !within(addr, mod->module_core, mod->core_text_size))
3455 mod = NULL;
3456 }
3457 return mod;
3458}
Tim Abbottc6b37802008-12-05 19:03:59 -05003459EXPORT_SYMBOL_GPL(__module_text_address);
Rusty Russelle6104992009-03-31 13:05:31 -06003460
Linus Torvalds1da177e2005-04-16 15:20:36 -07003461/* Don't grab lock, we're oopsing. */
3462void print_modules(void)
3463{
3464 struct module *mod;
Randy Dunlap2bc2d612006-10-02 02:17:02 -07003465 char buf[8];
Linus Torvalds1da177e2005-04-16 15:20:36 -07003466
Linus Torvaldsb2311252009-06-16 11:07:14 -07003467 printk(KERN_DEFAULT "Modules linked in:");
Andi Kleend72b3752008-08-30 10:09:00 +02003468 /* Most callers should already have preempt disabled, but make sure */
3469 preempt_disable();
3470 list_for_each_entry_rcu(mod, &modules, list)
Arjan van de Ven21aa9282008-01-25 21:08:33 +01003471 printk(" %s%s", mod->name, module_flags(mod, buf));
Andi Kleend72b3752008-08-30 10:09:00 +02003472 preempt_enable();
Arjan van de Vene14af7e2008-01-25 21:08:33 +01003473 if (last_unloaded_module[0])
3474 printk(" [last unloaded: %s]", last_unloaded_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003475 printk("\n");
3476}
3477
Linus Torvalds1da177e2005-04-16 15:20:36 -07003478#ifdef CONFIG_MODVERSIONS
Rusty Russell8c8ef422009-03-31 13:05:34 -06003479/* Generate the signature for all relevant module structures here.
3480 * If these change, we don't want to try to parse the module. */
3481void module_layout(struct module *mod,
3482 struct modversion_info *ver,
3483 struct kernel_param *kp,
3484 struct kernel_symbol *ks,
Mathieu Desnoyers65498642011-01-26 17:26:22 -05003485 struct tracepoint * const *tp)
Rusty Russell8c8ef422009-03-31 13:05:34 -06003486{
3487}
3488EXPORT_SYMBOL(module_layout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003489#endif