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Arjan van de Venf71d20e2006-06-28 04:26:45 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 Copyright (C) 2002 Richard Henderson
3 Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18*/
Linus 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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Li Zefan7ead8b82009-08-17 16:56:28 +080059#define CREATE_TRACE_POINTS
60#include <trace/events/module.h>
61
62EXPORT_TRACEPOINT_SYMBOL(module_get);
63
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#if 0
65#define DEBUGP printk
66#else
67#define DEBUGP(fmt , a...)
68#endif
69
70#ifndef ARCH_SHF_SMALL
71#define ARCH_SHF_SMALL 0
72#endif
73
74/* If this is set, the section belongs in the init part of the module */
75#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
76
Rusty Russell24da1cb2007-07-15 23:41:46 -070077/* List of modules, protected by module_mutex or preempt_disable
Andi Kleend72b3752008-08-30 10:09:00 +020078 * (delete uses stop_machine/add uses RCU list operations). */
Tim Abbottc6b37802008-12-05 19:03:59 -050079DEFINE_MUTEX(module_mutex);
80EXPORT_SYMBOL_GPL(module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081static LIST_HEAD(modules);
82
Stephen Rothwell19e45292009-04-14 17:27:18 +100083/* Block module loading/unloading? */
84int modules_disabled = 0;
85
Rusty Russellc9a3ba52008-01-29 17:13:18 -050086/* Waiting for a module to finish initializing? */
87static DECLARE_WAIT_QUEUE_HEAD(module_wq);
88
Alan Sterne041c682006-03-27 01:16:30 -080089static BLOCKING_NOTIFIER_HEAD(module_notify_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
Rusty Russelle6104992009-03-31 13:05:31 -060091/* Bounds of module allocation, for speeding __module_address */
Rusty Russell3a642e92008-07-22 19:24:28 -050092static unsigned long module_addr_min = -1UL, module_addr_max = 0;
93
Linus Torvalds1da177e2005-04-16 15:20:36 -070094int register_module_notifier(struct notifier_block * nb)
95{
Alan Sterne041c682006-03-27 01:16:30 -080096 return blocking_notifier_chain_register(&module_notify_list, nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097}
98EXPORT_SYMBOL(register_module_notifier);
99
100int unregister_module_notifier(struct notifier_block * nb)
101{
Alan Sterne041c682006-03-27 01:16:30 -0800102 return blocking_notifier_chain_unregister(&module_notify_list, nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103}
104EXPORT_SYMBOL(unregister_module_notifier);
105
Matti Linnanvuori9a4b9702007-11-08 08:37:38 -0800106/* We require a truly strong try_module_get(): 0 means failure due to
107 ongoing or failed initialization etc. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108static inline int strong_try_module_get(struct module *mod)
109{
110 if (mod && mod->state == MODULE_STATE_COMING)
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500111 return -EBUSY;
112 if (try_module_get(mod))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 return 0;
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500114 else
115 return -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116}
117
Florin Malitafa3ba2e82006-10-11 01:21:48 -0700118static inline void add_taint_module(struct module *mod, unsigned flag)
119{
120 add_taint(flag);
Andi Kleen25ddbb12008-10-15 22:01:41 -0700121 mod->taints |= (1U << flag);
Florin Malitafa3ba2e82006-10-11 01:21:48 -0700122}
123
Robert P. J. Day02a3e592007-05-09 07:26:28 +0200124/*
125 * A thread that wants to hold a reference to a module only while it
126 * is running can call this to safely exit. nfsd and lockd use this.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 */
128void __module_put_and_exit(struct module *mod, long code)
129{
130 module_put(mod);
131 do_exit(code);
132}
133EXPORT_SYMBOL(__module_put_and_exit);
Daniel Walker22a8bde2007-10-18 03:06:07 -0700134
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135/* Find a module section: 0 means not found. */
136static unsigned int find_sec(Elf_Ehdr *hdr,
137 Elf_Shdr *sechdrs,
138 const char *secstrings,
139 const char *name)
140{
141 unsigned int i;
142
143 for (i = 1; i < hdr->e_shnum; i++)
144 /* Alloc bit cleared means "ignore it." */
145 if ((sechdrs[i].sh_flags & SHF_ALLOC)
146 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
147 return i;
148 return 0;
149}
150
Rusty Russell5e458cc2008-10-22 10:00:13 -0500151/* Find a module section, or NULL. */
152static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs,
153 const char *secstrings, const char *name)
154{
155 /* Section 0 has sh_addr 0. */
156 return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr;
157}
158
159/* Find a module section, or NULL. Fill in number of "objects" in section. */
160static void *section_objs(Elf_Ehdr *hdr,
161 Elf_Shdr *sechdrs,
162 const char *secstrings,
163 const char *name,
164 size_t object_size,
165 unsigned int *num)
166{
167 unsigned int sec = find_sec(hdr, sechdrs, secstrings, name);
168
169 /* Section 0 has sh_addr 0 and sh_size 0. */
170 *num = sechdrs[sec].sh_size / object_size;
171 return (void *)sechdrs[sec].sh_addr;
172}
173
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174/* Provided by the linker */
175extern const struct kernel_symbol __start___ksymtab[];
176extern const struct kernel_symbol __stop___ksymtab[];
177extern const struct kernel_symbol __start___ksymtab_gpl[];
178extern const struct kernel_symbol __stop___ksymtab_gpl[];
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -0800179extern const struct kernel_symbol __start___ksymtab_gpl_future[];
180extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700181extern const struct kernel_symbol __start___ksymtab_gpl_future[];
182extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183extern const unsigned long __start___kcrctab[];
184extern const unsigned long __start___kcrctab_gpl[];
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -0800185extern const unsigned long __start___kcrctab_gpl_future[];
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500186#ifdef CONFIG_UNUSED_SYMBOLS
187extern const struct kernel_symbol __start___ksymtab_unused[];
188extern const struct kernel_symbol __stop___ksymtab_unused[];
189extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
190extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700191extern const unsigned long __start___kcrctab_unused[];
192extern const unsigned long __start___kcrctab_unused_gpl[];
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500193#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
195#ifndef CONFIG_MODVERSIONS
196#define symversion(base, idx) NULL
197#else
Andrew Mortonf83ca9f2006-03-28 01:56:20 -0800198#define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199#endif
200
Rusty Russelldafd0942008-07-22 19:24:25 -0500201static bool each_symbol_in_section(const struct symsearch *arr,
202 unsigned int arrsize,
203 struct module *owner,
204 bool (*fn)(const struct symsearch *syms,
205 struct module *owner,
206 unsigned int symnum, void *data),
207 void *data)
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100208{
Rusty Russelldafd0942008-07-22 19:24:25 -0500209 unsigned int i, j;
210
211 for (j = 0; j < arrsize; j++) {
212 for (i = 0; i < arr[j].stop - arr[j].start; i++)
213 if (fn(&arr[j], owner, i, data))
214 return true;
215 }
216
217 return false;
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100218}
219
Rusty Russelldafd0942008-07-22 19:24:25 -0500220/* Returns true as soon as fn returns true, otherwise false. */
Tim Abbottc6b37802008-12-05 19:03:59 -0500221bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner,
222 unsigned int symnum, void *data), void *data)
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700223{
Rusty Russelldafd0942008-07-22 19:24:25 -0500224 struct module *mod;
225 const struct symsearch arr[] = {
226 { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
227 NOT_GPL_ONLY, false },
228 { __start___ksymtab_gpl, __stop___ksymtab_gpl,
229 __start___kcrctab_gpl,
230 GPL_ONLY, false },
231 { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
232 __start___kcrctab_gpl_future,
233 WILL_BE_GPL_ONLY, false },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500234#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russelldafd0942008-07-22 19:24:25 -0500235 { __start___ksymtab_unused, __stop___ksymtab_unused,
236 __start___kcrctab_unused,
237 NOT_GPL_ONLY, true },
238 { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
239 __start___kcrctab_unused_gpl,
240 GPL_ONLY, true },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500241#endif
Rusty Russelldafd0942008-07-22 19:24:25 -0500242 };
243
244 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
245 return true;
246
Andi Kleend72b3752008-08-30 10:09:00 +0200247 list_for_each_entry_rcu(mod, &modules, list) {
Rusty Russelldafd0942008-07-22 19:24:25 -0500248 struct symsearch arr[] = {
249 { mod->syms, mod->syms + mod->num_syms, mod->crcs,
250 NOT_GPL_ONLY, false },
251 { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
252 mod->gpl_crcs,
253 GPL_ONLY, false },
254 { mod->gpl_future_syms,
255 mod->gpl_future_syms + mod->num_gpl_future_syms,
256 mod->gpl_future_crcs,
257 WILL_BE_GPL_ONLY, false },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500258#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russelldafd0942008-07-22 19:24:25 -0500259 { mod->unused_syms,
260 mod->unused_syms + mod->num_unused_syms,
261 mod->unused_crcs,
262 NOT_GPL_ONLY, true },
263 { mod->unused_gpl_syms,
264 mod->unused_gpl_syms + mod->num_unused_gpl_syms,
265 mod->unused_gpl_crcs,
266 GPL_ONLY, true },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500267#endif
Rusty Russelldafd0942008-07-22 19:24:25 -0500268 };
269
270 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
271 return true;
272 }
273 return false;
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700274}
Tim Abbottc6b37802008-12-05 19:03:59 -0500275EXPORT_SYMBOL_GPL(each_symbol);
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700276
Rusty Russelldafd0942008-07-22 19:24:25 -0500277struct find_symbol_arg {
278 /* Input */
279 const char *name;
280 bool gplok;
281 bool warn;
282
283 /* Output */
284 struct module *owner;
285 const unsigned long *crc;
Tim Abbott414fd312008-12-05 19:03:56 -0500286 const struct kernel_symbol *sym;
Rusty Russelldafd0942008-07-22 19:24:25 -0500287};
288
289static bool find_symbol_in_section(const struct symsearch *syms,
290 struct module *owner,
291 unsigned int symnum, void *data)
Rusty Russellad9546c2008-05-01 21:14:59 -0500292{
Rusty Russelldafd0942008-07-22 19:24:25 -0500293 struct find_symbol_arg *fsa = data;
294
295 if (strcmp(syms->start[symnum].name, fsa->name) != 0)
296 return false;
297
298 if (!fsa->gplok) {
299 if (syms->licence == GPL_ONLY)
300 return false;
301 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
302 printk(KERN_WARNING "Symbol %s is being used "
303 "by a non-GPL module, which will not "
304 "be allowed in the future\n", fsa->name);
305 printk(KERN_WARNING "Please see the file "
306 "Documentation/feature-removal-schedule.txt "
307 "in the kernel source tree for more details.\n");
308 }
309 }
310
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500311#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russelldafd0942008-07-22 19:24:25 -0500312 if (syms->unused && fsa->warn) {
Rusty Russellad9546c2008-05-01 21:14:59 -0500313 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
Rusty Russelldafd0942008-07-22 19:24:25 -0500314 "however this module is using it.\n", fsa->name);
Rusty Russellad9546c2008-05-01 21:14:59 -0500315 printk(KERN_WARNING
316 "This symbol will go away in the future.\n");
317 printk(KERN_WARNING
318 "Please evalute if this is the right api to use and if "
319 "it really is, submit a report the linux kernel "
320 "mailinglist together with submitting your code for "
321 "inclusion.\n");
322 }
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500323#endif
Rusty Russelldafd0942008-07-22 19:24:25 -0500324
325 fsa->owner = owner;
326 fsa->crc = symversion(syms->crcs, symnum);
Tim Abbott414fd312008-12-05 19:03:56 -0500327 fsa->sym = &syms->start[symnum];
Rusty Russellad9546c2008-05-01 21:14:59 -0500328 return true;
329}
330
Tim Abbott414fd312008-12-05 19:03:56 -0500331/* Find a symbol and return it, along with, (optional) crc and
332 * (optional) module which owns it */
Tim Abbottc6b37802008-12-05 19:03:59 -0500333const struct kernel_symbol *find_symbol(const char *name,
334 struct module **owner,
335 const unsigned long **crc,
336 bool gplok,
337 bool warn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338{
Rusty Russelldafd0942008-07-22 19:24:25 -0500339 struct find_symbol_arg fsa;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340
Rusty Russelldafd0942008-07-22 19:24:25 -0500341 fsa.name = name;
342 fsa.gplok = gplok;
343 fsa.warn = warn;
344
345 if (each_symbol(find_symbol_in_section, &fsa)) {
Rusty Russellad9546c2008-05-01 21:14:59 -0500346 if (owner)
Rusty Russelldafd0942008-07-22 19:24:25 -0500347 *owner = fsa.owner;
348 if (crc)
349 *crc = fsa.crc;
Tim Abbott414fd312008-12-05 19:03:56 -0500350 return fsa.sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 }
Rusty Russellad9546c2008-05-01 21:14:59 -0500352
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 DEBUGP("Failed to find symbol %s\n", name);
Tim Abbott414fd312008-12-05 19:03:56 -0500354 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355}
Tim Abbottc6b37802008-12-05 19:03:59 -0500356EXPORT_SYMBOL_GPL(find_symbol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358/* Search for module by name: must hold module_mutex. */
Tim Abbottc6b37802008-12-05 19:03:59 -0500359struct module *find_module(const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360{
361 struct module *mod;
362
363 list_for_each_entry(mod, &modules, list) {
364 if (strcmp(mod->name, name) == 0)
365 return mod;
366 }
367 return NULL;
368}
Tim Abbottc6b37802008-12-05 19:03:59 -0500369EXPORT_SYMBOL_GPL(find_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
371#ifdef CONFIG_SMP
Tejun Heofbf59bc2009-02-20 16:29:08 +0900372
Tejun Heoe74e3962009-03-30 19:07:44 +0900373#ifndef CONFIG_HAVE_LEGACY_PER_CPU_AREA
Tejun Heofbf59bc2009-02-20 16:29:08 +0900374
375static void *percpu_modalloc(unsigned long size, unsigned long align,
376 const char *name)
377{
378 void *ptr;
379
380 if (align > PAGE_SIZE) {
381 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
382 name, align, PAGE_SIZE);
383 align = PAGE_SIZE;
384 }
385
Tejun Heoedcb4632009-03-06 14:33:59 +0900386 ptr = __alloc_reserved_percpu(size, align);
Tejun Heofbf59bc2009-02-20 16:29:08 +0900387 if (!ptr)
388 printk(KERN_WARNING
389 "Could not allocate %lu bytes percpu data\n", size);
390 return ptr;
391}
392
393static void percpu_modfree(void *freeme)
394{
395 free_percpu(freeme);
396}
397
Tejun Heoe74e3962009-03-30 19:07:44 +0900398#else /* ... CONFIG_HAVE_LEGACY_PER_CPU_AREA */
Tejun Heofbf59bc2009-02-20 16:29:08 +0900399
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400/* Number of blocks used and allocated. */
401static unsigned int pcpu_num_used, pcpu_num_allocated;
402/* Size of each block. -ve means used. */
403static int *pcpu_size;
404
405static int split_block(unsigned int i, unsigned short size)
406{
407 /* Reallocation required? */
408 if (pcpu_num_used + 1 > pcpu_num_allocated) {
Pekka Enberg6d4f9c52007-05-08 00:24:58 -0700409 int *new;
410
411 new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2,
412 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 if (!new)
414 return 0;
415
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 pcpu_num_allocated *= 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 pcpu_size = new;
418 }
419
420 /* Insert a new subblock */
421 memmove(&pcpu_size[i+1], &pcpu_size[i],
422 sizeof(pcpu_size[0]) * (pcpu_num_used - i));
423 pcpu_num_used++;
424
425 pcpu_size[i+1] -= size;
426 pcpu_size[i] = size;
427 return 1;
428}
429
430static inline unsigned int block_size(int val)
431{
432 if (val < 0)
433 return -val;
434 return val;
435}
436
Rusty Russell842bbaa2005-08-01 21:11:47 -0700437static void *percpu_modalloc(unsigned long size, unsigned long align,
438 const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439{
440 unsigned long extra;
441 unsigned int i;
442 void *ptr;
Catalin Marinas4f2294b2009-06-11 13:23:20 +0100443 int cpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
Jeremy Fitzhardingeb6e35902007-05-02 19:27:12 +0200445 if (align > PAGE_SIZE) {
446 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
447 name, align, PAGE_SIZE);
448 align = PAGE_SIZE;
Rusty Russell842bbaa2005-08-01 21:11:47 -0700449 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450
451 ptr = __per_cpu_start;
452 for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
453 /* Extra for alignment requirement. */
454 extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr;
455 BUG_ON(i == 0 && extra != 0);
456
457 if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size)
458 continue;
459
460 /* Transfer extra to previous block. */
461 if (pcpu_size[i-1] < 0)
462 pcpu_size[i-1] -= extra;
463 else
464 pcpu_size[i-1] += extra;
465 pcpu_size[i] -= extra;
466 ptr += extra;
467
468 /* Split block if warranted */
469 if (pcpu_size[i] - size > sizeof(unsigned long))
470 if (!split_block(i, size))
471 return NULL;
472
Catalin Marinas4f2294b2009-06-11 13:23:20 +0100473 /* add the per-cpu scanning areas */
474 for_each_possible_cpu(cpu)
475 kmemleak_alloc(ptr + per_cpu_offset(cpu), size, 0,
476 GFP_KERNEL);
477
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 /* Mark allocated */
479 pcpu_size[i] = -pcpu_size[i];
480 return ptr;
481 }
482
483 printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n",
484 size);
485 return NULL;
486}
487
488static void percpu_modfree(void *freeme)
489{
490 unsigned int i;
491 void *ptr = __per_cpu_start + block_size(pcpu_size[0]);
Catalin Marinas4f2294b2009-06-11 13:23:20 +0100492 int cpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
494 /* First entry is core kernel percpu data. */
495 for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
496 if (ptr == freeme) {
497 pcpu_size[i] = -pcpu_size[i];
498 goto free;
499 }
500 }
501 BUG();
502
503 free:
Catalin Marinas4f2294b2009-06-11 13:23:20 +0100504 /* remove the per-cpu scanning areas */
505 for_each_possible_cpu(cpu)
506 kmemleak_free(freeme + per_cpu_offset(cpu));
507
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 /* Merge with previous? */
509 if (pcpu_size[i-1] >= 0) {
510 pcpu_size[i-1] += pcpu_size[i];
511 pcpu_num_used--;
512 memmove(&pcpu_size[i], &pcpu_size[i+1],
513 (pcpu_num_used - i) * sizeof(pcpu_size[0]));
514 i--;
515 }
516 /* Merge with next? */
517 if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) {
518 pcpu_size[i] += pcpu_size[i+1];
519 pcpu_num_used--;
520 memmove(&pcpu_size[i+1], &pcpu_size[i+2],
521 (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0]));
522 }
523}
524
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525static int percpu_modinit(void)
526{
527 pcpu_num_used = 2;
528 pcpu_num_allocated = 2;
529 pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated,
530 GFP_KERNEL);
531 /* Static in-kernel percpu data (used). */
Jeremy Fitzhardingeb00742d32007-05-02 19:27:11 +0200532 pcpu_size[0] = -(__per_cpu_end-__per_cpu_start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 /* Free room. */
534 pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0];
535 if (pcpu_size[1] < 0) {
536 printk(KERN_ERR "No per-cpu room for modules.\n");
537 pcpu_num_used = 1;
538 }
539
540 return 0;
Daniel Walker22a8bde2007-10-18 03:06:07 -0700541}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542__initcall(percpu_modinit);
Tejun Heo6b588c12009-02-20 16:29:07 +0900543
Tejun Heoe74e3962009-03-30 19:07:44 +0900544#endif /* CONFIG_HAVE_LEGACY_PER_CPU_AREA */
Tejun Heofbf59bc2009-02-20 16:29:08 +0900545
Tejun Heo6b588c12009-02-20 16:29:07 +0900546static unsigned int find_pcpusec(Elf_Ehdr *hdr,
547 Elf_Shdr *sechdrs,
548 const char *secstrings)
549{
550 return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
551}
552
553static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size)
554{
555 int cpu;
556
557 for_each_possible_cpu(cpu)
558 memcpy(pcpudest + per_cpu_offset(cpu), from, size);
559}
560
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561#else /* ... !CONFIG_SMP */
Tejun Heo6b588c12009-02-20 16:29:07 +0900562
Rusty Russell842bbaa2005-08-01 21:11:47 -0700563static inline void *percpu_modalloc(unsigned long size, unsigned long align,
564 const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565{
566 return NULL;
567}
568static inline void percpu_modfree(void *pcpuptr)
569{
570 BUG();
571}
572static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
573 Elf_Shdr *sechdrs,
574 const char *secstrings)
575{
576 return 0;
577}
578static inline void percpu_modcopy(void *pcpudst, const void *src,
579 unsigned long size)
580{
581 /* pcpusec should be 0, and size of that section should be 0. */
582 BUG_ON(size != 0);
583}
Tejun Heo6b588c12009-02-20 16:29:07 +0900584
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585#endif /* CONFIG_SMP */
586
Matt Domschc988d2b2005-06-23 22:05:15 -0700587#define MODINFO_ATTR(field) \
588static void setup_modinfo_##field(struct module *mod, const char *s) \
589{ \
590 mod->field = kstrdup(s, GFP_KERNEL); \
591} \
592static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
593 struct module *mod, char *buffer) \
594{ \
595 return sprintf(buffer, "%s\n", mod->field); \
596} \
597static int modinfo_##field##_exists(struct module *mod) \
598{ \
599 return mod->field != NULL; \
600} \
601static void free_modinfo_##field(struct module *mod) \
602{ \
Daniel Walker22a8bde2007-10-18 03:06:07 -0700603 kfree(mod->field); \
604 mod->field = NULL; \
Matt Domschc988d2b2005-06-23 22:05:15 -0700605} \
606static struct module_attribute modinfo_##field = { \
Tejun Heo7b595752007-06-14 03:45:17 +0900607 .attr = { .name = __stringify(field), .mode = 0444 }, \
Matt Domschc988d2b2005-06-23 22:05:15 -0700608 .show = show_modinfo_##field, \
609 .setup = setup_modinfo_##field, \
610 .test = modinfo_##field##_exists, \
611 .free = free_modinfo_##field, \
612};
613
614MODINFO_ATTR(version);
615MODINFO_ATTR(srcversion);
616
Arjan van de Vene14af7e2008-01-25 21:08:33 +0100617static char last_unloaded_module[MODULE_NAME_LEN+1];
618
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -0800619#ifdef CONFIG_MODULE_UNLOAD
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620/* Init the unload section of the module. */
621static void module_unload_init(struct module *mod)
622{
Eric Dumazet720eba32009-02-03 13:31:36 +1030623 int cpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624
625 INIT_LIST_HEAD(&mod->modules_which_use_me);
Eric Dumazet720eba32009-02-03 13:31:36 +1030626 for_each_possible_cpu(cpu)
627 local_set(__module_ref_addr(mod, cpu), 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 /* Hold reference count during initialization. */
Eric Dumazet720eba32009-02-03 13:31:36 +1030629 local_set(__module_ref_addr(mod, raw_smp_processor_id()), 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 /* Backwards compatibility macros put refcount during init. */
631 mod->waiter = current;
632}
633
634/* modules using other modules */
635struct module_use
636{
637 struct list_head list;
638 struct module *module_which_uses;
639};
640
641/* Does a already use b? */
642static int already_uses(struct module *a, struct module *b)
643{
644 struct module_use *use;
645
646 list_for_each_entry(use, &b->modules_which_use_me, list) {
647 if (use->module_which_uses == a) {
648 DEBUGP("%s uses %s!\n", a->name, b->name);
649 return 1;
650 }
651 }
652 DEBUGP("%s does not use %s!\n", a->name, b->name);
653 return 0;
654}
655
656/* Module a uses b */
Tim Abbottc6b37802008-12-05 19:03:59 -0500657int use_module(struct module *a, struct module *b)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658{
659 struct module_use *use;
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500660 int no_warn, err;
Kay Sievers270a6c42007-01-18 13:26:15 +0100661
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 if (b == NULL || already_uses(a, b)) return 1;
663
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500664 /* If we're interrupted or time out, we fail. */
665 if (wait_event_interruptible_timeout(
666 module_wq, (err = strong_try_module_get(b)) != -EBUSY,
667 30 * HZ) <= 0) {
668 printk("%s: gave up waiting for init of module %s.\n",
669 a->name, b->name);
670 return 0;
671 }
672
673 /* If strong_try_module_get() returned a different error, we fail. */
674 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 return 0;
676
677 DEBUGP("Allocating new usage for %s.\n", a->name);
678 use = kmalloc(sizeof(*use), GFP_ATOMIC);
679 if (!use) {
680 printk("%s: out of memory loading\n", a->name);
681 module_put(b);
682 return 0;
683 }
684
685 use->module_which_uses = a;
686 list_add(&use->list, &b->modules_which_use_me);
Kay Sievers270a6c42007-01-18 13:26:15 +0100687 no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 return 1;
689}
Tim Abbottc6b37802008-12-05 19:03:59 -0500690EXPORT_SYMBOL_GPL(use_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
692/* Clear the unload stuff of the module. */
693static void module_unload_free(struct module *mod)
694{
695 struct module *i;
696
697 list_for_each_entry(i, &modules, list) {
698 struct module_use *use;
699
700 list_for_each_entry(use, &i->modules_which_use_me, list) {
701 if (use->module_which_uses == mod) {
702 DEBUGP("%s unusing %s\n", mod->name, i->name);
703 module_put(i);
704 list_del(&use->list);
705 kfree(use);
Kay Sievers270a6c42007-01-18 13:26:15 +0100706 sysfs_remove_link(i->holders_dir, mod->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 /* There can be at most one match. */
708 break;
709 }
710 }
711 }
712}
713
714#ifdef CONFIG_MODULE_FORCE_UNLOAD
Akinobu Mitafb169792006-01-08 01:04:29 -0800715static inline int try_force_unload(unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716{
717 int ret = (flags & O_TRUNC);
718 if (ret)
Akinobu Mitafb169792006-01-08 01:04:29 -0800719 add_taint(TAINT_FORCED_RMMOD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 return ret;
721}
722#else
Akinobu Mitafb169792006-01-08 01:04:29 -0800723static inline int try_force_unload(unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724{
725 return 0;
726}
727#endif /* CONFIG_MODULE_FORCE_UNLOAD */
728
729struct stopref
730{
731 struct module *mod;
732 int flags;
733 int *forced;
734};
735
736/* Whole machine is stopped with interrupts off when this runs. */
737static int __try_stop_module(void *_sref)
738{
739 struct stopref *sref = _sref;
740
Rusty Russellda39ba52008-07-22 19:24:25 -0500741 /* If it's not unused, quit unless we're forcing. */
742 if (module_refcount(sref->mod) != 0) {
Akinobu Mitafb169792006-01-08 01:04:29 -0800743 if (!(*sref->forced = try_force_unload(sref->flags)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 return -EWOULDBLOCK;
745 }
746
747 /* Mark it as dying. */
748 sref->mod->state = MODULE_STATE_GOING;
749 return 0;
750}
751
752static int try_stop_module(struct module *mod, int flags, int *forced)
753{
Rusty Russellda39ba52008-07-22 19:24:25 -0500754 if (flags & O_NONBLOCK) {
755 struct stopref sref = { mod, flags, forced };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756
Rusty Russell9b1a4d32008-07-28 12:16:30 -0500757 return stop_machine(__try_stop_module, &sref, NULL);
Rusty Russellda39ba52008-07-22 19:24:25 -0500758 } else {
759 /* We don't need to stop the machine for this. */
760 mod->state = MODULE_STATE_GOING;
761 synchronize_sched();
762 return 0;
763 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764}
765
766unsigned int module_refcount(struct module *mod)
767{
Eric Dumazet720eba32009-02-03 13:31:36 +1030768 unsigned int total = 0;
769 int cpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
Eric Dumazet720eba32009-02-03 13:31:36 +1030771 for_each_possible_cpu(cpu)
772 total += local_read(__module_ref_addr(mod, cpu));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 return total;
774}
775EXPORT_SYMBOL(module_refcount);
776
777/* This exists whether we can unload or not */
778static void free_module(struct module *mod);
779
780static void wait_for_zero_refcount(struct module *mod)
781{
Matthew Wilcoxa6550202008-02-26 10:47:18 -0500782 /* Since we might sleep for some time, release the mutex first */
Ashutosh Naik6389a382006-03-23 03:00:46 -0800783 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 for (;;) {
785 DEBUGP("Looking at refcount...\n");
786 set_current_state(TASK_UNINTERRUPTIBLE);
787 if (module_refcount(mod) == 0)
788 break;
789 schedule();
790 }
791 current->state = TASK_RUNNING;
Ashutosh Naik6389a382006-03-23 03:00:46 -0800792 mutex_lock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793}
794
Heiko Carstens17da2bd2009-01-14 14:14:10 +0100795SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
796 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797{
798 struct module *mod;
Greg Kroah-Hartmandfff0a02007-02-23 14:54:57 -0800799 char name[MODULE_NAME_LEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 int ret, forced = 0;
801
Kees Cook3d433212009-04-02 15:49:29 -0700802 if (!capable(CAP_SYS_MODULE) || modules_disabled)
Greg Kroah-Hartmandfff0a02007-02-23 14:54:57 -0800803 return -EPERM;
804
805 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
806 return -EFAULT;
807 name[MODULE_NAME_LEN-1] = '\0';
808
Heiko Carstens9e018922008-12-22 12:36:31 +0100809 /* Create stop_machine threads since free_module relies on
810 * a non-failing stop_machine call. */
811 ret = stop_machine_create();
812 if (ret)
813 return ret;
814
815 if (mutex_lock_interruptible(&module_mutex) != 0) {
816 ret = -EINTR;
817 goto out_stop;
818 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819
820 mod = find_module(name);
821 if (!mod) {
822 ret = -ENOENT;
823 goto out;
824 }
825
826 if (!list_empty(&mod->modules_which_use_me)) {
827 /* Other modules depend on us: get rid of them first. */
828 ret = -EWOULDBLOCK;
829 goto out;
830 }
831
832 /* Doing init or already dying? */
833 if (mod->state != MODULE_STATE_LIVE) {
834 /* FIXME: if (force), slam module count and wake up
835 waiter --RR */
836 DEBUGP("%s already dying\n", mod->name);
837 ret = -EBUSY;
838 goto out;
839 }
840
841 /* If it has an init func, it must have an exit func to unload */
Rusty Russellaf49d922007-10-16 23:26:27 -0700842 if (mod->init && !mod->exit) {
Akinobu Mitafb169792006-01-08 01:04:29 -0800843 forced = try_force_unload(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844 if (!forced) {
845 /* This module can't be removed */
846 ret = -EBUSY;
847 goto out;
848 }
849 }
850
851 /* Set this up before setting mod->state */
852 mod->waiter = current;
853
854 /* Stop the machine so refcounts can't move and disable module. */
855 ret = try_stop_module(mod, flags, &forced);
856 if (ret != 0)
857 goto out;
858
859 /* Never wait if forced. */
860 if (!forced && module_refcount(mod) != 0)
861 wait_for_zero_refcount(mod);
862
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +0200863 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 /* Final destruction now noone is using it. */
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +0200865 if (mod->exit != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 mod->exit();
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +0200867 blocking_notifier_call_chain(&module_notify_list,
868 MODULE_STATE_GOING, mod);
Arjan van de Ven22a9d642009-01-07 08:45:46 -0800869 async_synchronize_full();
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +0200870 mutex_lock(&module_mutex);
Arjan van de Vene14af7e2008-01-25 21:08:33 +0100871 /* Store the name of the last unloaded module for diagnostic purposes */
Rusty Russellefa53452008-01-29 17:13:20 -0500872 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
Jason Barone9d376f2009-02-05 11:51:38 -0500873 ddebug_remove_module(mod->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 free_module(mod);
875
876 out:
Ashutosh Naik6389a382006-03-23 03:00:46 -0800877 mutex_unlock(&module_mutex);
Heiko Carstens9e018922008-12-22 12:36:31 +0100878out_stop:
879 stop_machine_destroy();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 return ret;
881}
882
Jianjun Kongd1e99d72008-12-08 14:26:29 +0800883static inline void print_unload_info(struct seq_file *m, struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884{
885 struct module_use *use;
886 int printed_something = 0;
887
888 seq_printf(m, " %u ", module_refcount(mod));
889
890 /* Always include a trailing , so userspace can differentiate
891 between this and the old multi-field proc format. */
892 list_for_each_entry(use, &mod->modules_which_use_me, list) {
893 printed_something = 1;
894 seq_printf(m, "%s,", use->module_which_uses->name);
895 }
896
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 if (mod->init != NULL && mod->exit == NULL) {
898 printed_something = 1;
899 seq_printf(m, "[permanent],");
900 }
901
902 if (!printed_something)
903 seq_printf(m, "-");
904}
905
906void __symbol_put(const char *symbol)
907{
908 struct module *owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909
Rusty Russell24da1cb2007-07-15 23:41:46 -0700910 preempt_disable();
Tim Abbott414fd312008-12-05 19:03:56 -0500911 if (!find_symbol(symbol, &owner, NULL, true, false))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 BUG();
913 module_put(owner);
Rusty Russell24da1cb2007-07-15 23:41:46 -0700914 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915}
916EXPORT_SYMBOL(__symbol_put);
917
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930918/* Note this assumes addr is a function, which it currently always is. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919void symbol_put_addr(void *addr)
920{
Trent Piepho5e376612006-05-15 09:44:06 -0700921 struct module *modaddr;
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930922 unsigned long a = (unsigned long)dereference_function_descriptor(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930924 if (core_kernel_text(a))
Trent Piepho5e376612006-05-15 09:44:06 -0700925 return;
926
Rusty Russella6e6abd2009-03-31 13:05:31 -0600927 /* module_text_address is safe here: we're supposed to have reference
928 * to module from symbol_get, so it can't go away. */
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930929 modaddr = __module_text_address(a);
Rusty Russella6e6abd2009-03-31 13:05:31 -0600930 BUG_ON(!modaddr);
Trent Piepho5e376612006-05-15 09:44:06 -0700931 module_put(modaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932}
933EXPORT_SYMBOL_GPL(symbol_put_addr);
934
935static ssize_t show_refcnt(struct module_attribute *mattr,
936 struct module *mod, char *buffer)
937{
Alexey Dobriyan256e2fd2007-08-06 23:47:45 +0400938 return sprintf(buffer, "%u\n", module_refcount(mod));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939}
940
941static struct module_attribute refcnt = {
Tejun Heo7b595752007-06-14 03:45:17 +0900942 .attr = { .name = "refcnt", .mode = 0444 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943 .show = show_refcnt,
944};
945
Al Virof6a57032006-10-18 01:47:25 -0400946void module_put(struct module *module)
947{
948 if (module) {
949 unsigned int cpu = get_cpu();
Eric Dumazet720eba32009-02-03 13:31:36 +1030950 local_dec(__module_ref_addr(module, cpu));
Li Zefan7ead8b82009-08-17 16:56:28 +0800951 trace_module_put(module, _RET_IP_,
952 local_read(__module_ref_addr(module, cpu)));
Al Virof6a57032006-10-18 01:47:25 -0400953 /* Maybe they're waiting for us to drop reference? */
954 if (unlikely(!module_is_live(module)))
955 wake_up_process(module->waiter);
956 put_cpu();
957 }
958}
959EXPORT_SYMBOL(module_put);
960
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961#else /* !CONFIG_MODULE_UNLOAD */
Jianjun Kongd1e99d72008-12-08 14:26:29 +0800962static inline void print_unload_info(struct seq_file *m, struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963{
964 /* We don't know the usage count, or what modules are using. */
965 seq_printf(m, " - -");
966}
967
968static inline void module_unload_free(struct module *mod)
969{
970}
971
Tim Abbottc6b37802008-12-05 19:03:59 -0500972int use_module(struct module *a, struct module *b)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973{
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500974 return strong_try_module_get(b) == 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975}
Tim Abbottc6b37802008-12-05 19:03:59 -0500976EXPORT_SYMBOL_GPL(use_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977
978static inline void module_unload_init(struct module *mod)
979{
980}
981#endif /* CONFIG_MODULE_UNLOAD */
982
Kay Sievers1f717402006-11-24 12:15:25 +0100983static ssize_t show_initstate(struct module_attribute *mattr,
984 struct module *mod, char *buffer)
985{
986 const char *state = "unknown";
987
988 switch (mod->state) {
989 case MODULE_STATE_LIVE:
990 state = "live";
991 break;
992 case MODULE_STATE_COMING:
993 state = "coming";
994 break;
995 case MODULE_STATE_GOING:
996 state = "going";
997 break;
998 }
999 return sprintf(buffer, "%s\n", state);
1000}
1001
1002static struct module_attribute initstate = {
Tejun Heo7b595752007-06-14 03:45:17 +09001003 .attr = { .name = "initstate", .mode = 0444 },
Kay Sievers1f717402006-11-24 12:15:25 +01001004 .show = show_initstate,
1005};
1006
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001007static struct module_attribute *modinfo_attrs[] = {
1008 &modinfo_version,
1009 &modinfo_srcversion,
Kay Sievers1f717402006-11-24 12:15:25 +01001010 &initstate,
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001011#ifdef CONFIG_MODULE_UNLOAD
1012 &refcnt,
1013#endif
1014 NULL,
1015};
1016
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017static const char vermagic[] = VERMAGIC_STRING;
1018
Rusty Russellc6e665c2009-03-31 13:05:33 -06001019static int try_to_force_load(struct module *mod, const char *reason)
Linus Torvalds826e4502008-05-04 17:04:16 -07001020{
1021#ifdef CONFIG_MODULE_FORCE_LOAD
Andi Kleen25ddbb12008-10-15 22:01:41 -07001022 if (!test_taint(TAINT_FORCED_MODULE))
Rusty Russellc6e665c2009-03-31 13:05:33 -06001023 printk(KERN_WARNING "%s: %s: kernel tainted.\n",
1024 mod->name, reason);
Linus Torvalds826e4502008-05-04 17:04:16 -07001025 add_taint_module(mod, TAINT_FORCED_MODULE);
1026 return 0;
1027#else
1028 return -ENOEXEC;
1029#endif
1030}
1031
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032#ifdef CONFIG_MODVERSIONS
1033static int check_version(Elf_Shdr *sechdrs,
1034 unsigned int versindex,
1035 const char *symname,
1036 struct module *mod,
1037 const unsigned long *crc)
1038{
1039 unsigned int i, num_versions;
1040 struct modversion_info *versions;
1041
1042 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1043 if (!crc)
1044 return 1;
1045
Rusty 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
1058 if (versions[i].crc == *crc)
1059 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 DEBUGP("Found checksum %lX vs module %lX\n",
1061 *crc, 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
Mike Frysinger6560dc12009-07-23 23:42:08 +09301081 if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL,
1082 &crc, true, false))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 BUG();
Rusty Russell8c8ef422009-03-31 13:05:34 -06001084 return check_version(sechdrs, versindex, "module_layout", mod, crc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085}
1086
Rusty Russell91e37a72008-05-09 16:25:28 +10001087/* First part is kernel version, which we ignore if module has crcs. */
1088static inline int same_magic(const char *amagic, const char *bmagic,
1089 bool has_crcs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090{
Rusty Russell91e37a72008-05-09 16:25:28 +10001091 if (has_crcs) {
1092 amagic += strcspn(amagic, " ");
1093 bmagic += strcspn(bmagic, " ");
1094 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 return strcmp(amagic, bmagic) == 0;
1096}
1097#else
1098static inline int check_version(Elf_Shdr *sechdrs,
1099 unsigned int versindex,
1100 const char *symname,
1101 struct module *mod,
1102 const unsigned long *crc)
1103{
1104 return 1;
1105}
1106
1107static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1108 unsigned int versindex,
1109 struct module *mod)
1110{
1111 return 1;
1112}
1113
Rusty Russell91e37a72008-05-09 16:25:28 +10001114static inline int same_magic(const char *amagic, const char *bmagic,
1115 bool has_crcs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116{
1117 return strcmp(amagic, bmagic) == 0;
1118}
1119#endif /* CONFIG_MODVERSIONS */
1120
1121/* Resolve a symbol for this module. I.e. if we find one, record usage.
1122 Must be holding module_mutex. */
Tim Abbott414fd312008-12-05 19:03:56 -05001123static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
1124 unsigned int versindex,
1125 const char *name,
1126 struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127{
1128 struct module *owner;
Tim Abbott414fd312008-12-05 19:03:56 -05001129 const struct kernel_symbol *sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 const unsigned long *crc;
1131
Tim Abbott414fd312008-12-05 19:03:56 -05001132 sym = find_symbol(name, &owner, &crc,
Andi Kleen25ddbb12008-10-15 22:01:41 -07001133 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
Tim Abbott414fd312008-12-05 19:03:56 -05001134 /* use_module can fail due to OOM,
1135 or module initialization or unloading */
1136 if (sym) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 if (!check_version(sechdrs, versindex, name, mod, crc) ||
1138 !use_module(mod, owner))
Tim Abbott414fd312008-12-05 19:03:56 -05001139 sym = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 }
Tim Abbott414fd312008-12-05 19:03:56 -05001141 return sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142}
1143
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144/*
1145 * /sys/module/foo/sections stuff
1146 * J. Corbet <corbet@lwn.net>
1147 */
Kay Sievers120fc3d2008-02-21 00:33:20 +01001148#if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
Rusty Russella58730c2008-03-13 09:03:44 +00001149struct module_sect_attr
1150{
1151 struct module_attribute mattr;
1152 char *name;
1153 unsigned long address;
1154};
1155
1156struct module_sect_attrs
1157{
1158 struct attribute_group grp;
1159 unsigned int nsections;
1160 struct module_sect_attr attrs[0];
1161};
1162
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163static ssize_t module_sect_show(struct module_attribute *mattr,
1164 struct module *mod, char *buf)
1165{
1166 struct module_sect_attr *sattr =
1167 container_of(mattr, struct module_sect_attr, mattr);
1168 return sprintf(buf, "0x%lx\n", sattr->address);
1169}
1170
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001171static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1172{
Rusty Russella58730c2008-03-13 09:03:44 +00001173 unsigned int section;
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001174
1175 for (section = 0; section < sect_attrs->nsections; section++)
1176 kfree(sect_attrs->attrs[section].name);
1177 kfree(sect_attrs);
1178}
1179
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180static void add_sect_attrs(struct module *mod, unsigned int nsect,
1181 char *secstrings, Elf_Shdr *sechdrs)
1182{
1183 unsigned int nloaded = 0, i, size[2];
1184 struct module_sect_attrs *sect_attrs;
1185 struct module_sect_attr *sattr;
1186 struct attribute **gattr;
Daniel Walker22a8bde2007-10-18 03:06:07 -07001187
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 /* Count loaded sections and allocate structures */
1189 for (i = 0; i < nsect; i++)
1190 if (sechdrs[i].sh_flags & SHF_ALLOC)
1191 nloaded++;
1192 size[0] = ALIGN(sizeof(*sect_attrs)
1193 + nloaded * sizeof(sect_attrs->attrs[0]),
1194 sizeof(sect_attrs->grp.attrs[0]));
1195 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001196 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1197 if (sect_attrs == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 return;
1199
1200 /* Setup section attributes. */
1201 sect_attrs->grp.name = "sections";
1202 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1203
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001204 sect_attrs->nsections = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 sattr = &sect_attrs->attrs[0];
1206 gattr = &sect_attrs->grp.attrs[0];
1207 for (i = 0; i < nsect; i++) {
1208 if (! (sechdrs[i].sh_flags & SHF_ALLOC))
1209 continue;
1210 sattr->address = sechdrs[i].sh_addr;
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001211 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1212 GFP_KERNEL);
1213 if (sattr->name == NULL)
1214 goto out;
1215 sect_attrs->nsections++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 sattr->mattr.show = module_sect_show;
1217 sattr->mattr.store = NULL;
1218 sattr->mattr.attr.name = sattr->name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 sattr->mattr.attr.mode = S_IRUGO;
1220 *(gattr++) = &(sattr++)->mattr.attr;
1221 }
1222 *gattr = NULL;
1223
1224 if (sysfs_create_group(&mod->mkobj.kobj, &sect_attrs->grp))
1225 goto out;
1226
1227 mod->sect_attrs = sect_attrs;
1228 return;
1229 out:
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001230 free_sect_attrs(sect_attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231}
1232
1233static void remove_sect_attrs(struct module *mod)
1234{
1235 if (mod->sect_attrs) {
1236 sysfs_remove_group(&mod->mkobj.kobj,
1237 &mod->sect_attrs->grp);
1238 /* We are positive that no one is using any sect attrs
1239 * at this point. Deallocate immediately. */
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001240 free_sect_attrs(mod->sect_attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 mod->sect_attrs = NULL;
1242 }
1243}
1244
Roland McGrath6d760132007-10-16 23:26:40 -07001245/*
1246 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1247 */
1248
1249struct module_notes_attrs {
1250 struct kobject *dir;
1251 unsigned int notes;
1252 struct bin_attribute attrs[0];
1253};
1254
1255static ssize_t module_notes_read(struct kobject *kobj,
1256 struct bin_attribute *bin_attr,
1257 char *buf, loff_t pos, size_t count)
1258{
1259 /*
1260 * The caller checked the pos and count against our size.
1261 */
1262 memcpy(buf, bin_attr->private + pos, count);
1263 return count;
1264}
1265
1266static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1267 unsigned int i)
1268{
1269 if (notes_attrs->dir) {
1270 while (i-- > 0)
1271 sysfs_remove_bin_file(notes_attrs->dir,
1272 &notes_attrs->attrs[i]);
Alexey Dobriyane9432092008-09-23 23:51:11 +04001273 kobject_put(notes_attrs->dir);
Roland McGrath6d760132007-10-16 23:26:40 -07001274 }
1275 kfree(notes_attrs);
1276}
1277
1278static void add_notes_attrs(struct module *mod, unsigned int nsect,
1279 char *secstrings, Elf_Shdr *sechdrs)
1280{
1281 unsigned int notes, loaded, i;
1282 struct module_notes_attrs *notes_attrs;
1283 struct bin_attribute *nattr;
1284
Ingo Molnarea6bff32009-08-28 10:44:56 +02001285 /* failed to create section attributes, so can't create notes */
1286 if (!mod->sect_attrs)
1287 return;
1288
Roland McGrath6d760132007-10-16 23:26:40 -07001289 /* Count notes sections and allocate structures. */
1290 notes = 0;
1291 for (i = 0; i < nsect; i++)
1292 if ((sechdrs[i].sh_flags & SHF_ALLOC) &&
1293 (sechdrs[i].sh_type == SHT_NOTE))
1294 ++notes;
1295
1296 if (notes == 0)
1297 return;
1298
1299 notes_attrs = kzalloc(sizeof(*notes_attrs)
1300 + notes * sizeof(notes_attrs->attrs[0]),
1301 GFP_KERNEL);
1302 if (notes_attrs == NULL)
1303 return;
1304
1305 notes_attrs->notes = notes;
1306 nattr = &notes_attrs->attrs[0];
1307 for (loaded = i = 0; i < nsect; ++i) {
1308 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1309 continue;
1310 if (sechdrs[i].sh_type == SHT_NOTE) {
1311 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1312 nattr->attr.mode = S_IRUGO;
1313 nattr->size = sechdrs[i].sh_size;
1314 nattr->private = (void *) sechdrs[i].sh_addr;
1315 nattr->read = module_notes_read;
1316 ++nattr;
1317 }
1318 ++loaded;
1319 }
1320
Greg Kroah-Hartman4ff6abf2007-11-05 22:24:43 -08001321 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
Roland McGrath6d760132007-10-16 23:26:40 -07001322 if (!notes_attrs->dir)
1323 goto out;
1324
1325 for (i = 0; i < notes; ++i)
1326 if (sysfs_create_bin_file(notes_attrs->dir,
1327 &notes_attrs->attrs[i]))
1328 goto out;
1329
1330 mod->notes_attrs = notes_attrs;
1331 return;
1332
1333 out:
1334 free_notes_attrs(notes_attrs, i);
1335}
1336
1337static void remove_notes_attrs(struct module *mod)
1338{
1339 if (mod->notes_attrs)
1340 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1341}
1342
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343#else
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001344
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1346 char *sectstrings, Elf_Shdr *sechdrs)
1347{
1348}
1349
1350static inline void remove_sect_attrs(struct module *mod)
1351{
1352}
Roland McGrath6d760132007-10-16 23:26:40 -07001353
1354static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
1355 char *sectstrings, Elf_Shdr *sechdrs)
1356{
1357}
1358
1359static inline void remove_notes_attrs(struct module *mod)
1360{
1361}
Kay Sievers120fc3d2008-02-21 00:33:20 +01001362#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363
Randy Dunlapef665c12007-02-13 15:19:06 -08001364#ifdef CONFIG_SYSFS
1365int module_add_modinfo_attrs(struct module *mod)
Matt Domschc988d2b2005-06-23 22:05:15 -07001366{
1367 struct module_attribute *attr;
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001368 struct module_attribute *temp_attr;
Matt Domschc988d2b2005-06-23 22:05:15 -07001369 int error = 0;
1370 int i;
1371
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001372 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1373 (ARRAY_SIZE(modinfo_attrs) + 1)),
1374 GFP_KERNEL);
1375 if (!mod->modinfo_attrs)
1376 return -ENOMEM;
1377
1378 temp_attr = mod->modinfo_attrs;
Matt Domschc988d2b2005-06-23 22:05:15 -07001379 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1380 if (!attr->test ||
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001381 (attr->test && attr->test(mod))) {
1382 memcpy(temp_attr, attr, sizeof(*temp_attr));
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001383 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1384 ++temp_attr;
1385 }
Matt Domschc988d2b2005-06-23 22:05:15 -07001386 }
1387 return error;
1388}
1389
Randy Dunlapef665c12007-02-13 15:19:06 -08001390void module_remove_modinfo_attrs(struct module *mod)
Matt Domschc988d2b2005-06-23 22:05:15 -07001391{
1392 struct module_attribute *attr;
1393 int i;
1394
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001395 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1396 /* pick a field to test for end of list */
1397 if (!attr->attr.name)
1398 break;
Matt Domschc988d2b2005-06-23 22:05:15 -07001399 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001400 if (attr->free)
1401 attr->free(mod);
Matt Domschc988d2b2005-06-23 22:05:15 -07001402 }
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001403 kfree(mod->modinfo_attrs);
Matt Domschc988d2b2005-06-23 22:05:15 -07001404}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405
Randy Dunlapef665c12007-02-13 15:19:06 -08001406int mod_sysfs_init(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407{
1408 int err;
Greg Kroah-Hartman6494a932008-01-27 15:38:40 -08001409 struct kobject *kobj;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410
Greg Kroah-Hartman823bccf2007-04-13 13:15:19 -07001411 if (!module_sysfs_initialized) {
1412 printk(KERN_ERR "%s: module sysfs not initialized\n",
Ed Swierk1cc5f712006-09-25 16:25:36 -07001413 mod->name);
1414 err = -EINVAL;
1415 goto out;
1416 }
Greg Kroah-Hartman6494a932008-01-27 15:38:40 -08001417
1418 kobj = kset_find_obj(module_kset, mod->name);
1419 if (kobj) {
1420 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1421 kobject_put(kobj);
1422 err = -EINVAL;
1423 goto out;
1424 }
1425
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426 mod->mkobj.mod = mod;
Kay Sieverse17e0f52006-11-24 12:15:25 +01001427
Greg Kroah-Hartmanac3c8142007-12-17 23:05:35 -07001428 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1429 mod->mkobj.kobj.kset = module_kset;
1430 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1431 "%s", mod->name);
1432 if (err)
1433 kobject_put(&mod->mkobj.kobj);
Kay Sievers270a6c42007-01-18 13:26:15 +01001434
Kay Sievers97c146e2007-11-29 23:46:11 +01001435 /* delay uevent until full sysfs population */
Kay Sievers270a6c42007-01-18 13:26:15 +01001436out:
1437 return err;
1438}
1439
Randy Dunlapef665c12007-02-13 15:19:06 -08001440int mod_sysfs_setup(struct module *mod,
Kay Sievers270a6c42007-01-18 13:26:15 +01001441 struct kernel_param *kparam,
1442 unsigned int num_params)
1443{
1444 int err;
1445
Greg Kroah-Hartman4ff6abf2007-11-05 22:24:43 -08001446 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
Akinobu Mita240936e2007-04-26 00:12:09 -07001447 if (!mod->holders_dir) {
1448 err = -ENOMEM;
Kay Sievers270a6c42007-01-18 13:26:15 +01001449 goto out_unreg;
Akinobu Mita240936e2007-04-26 00:12:09 -07001450 }
Kay Sievers270a6c42007-01-18 13:26:15 +01001451
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452 err = module_param_sysfs_setup(mod, kparam, num_params);
1453 if (err)
Kay Sievers270a6c42007-01-18 13:26:15 +01001454 goto out_unreg_holders;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455
Matt Domschc988d2b2005-06-23 22:05:15 -07001456 err = module_add_modinfo_attrs(mod);
1457 if (err)
Kay Sieverse17e0f52006-11-24 12:15:25 +01001458 goto out_unreg_param;
Matt Domschc988d2b2005-06-23 22:05:15 -07001459
Kay Sieverse17e0f52006-11-24 12:15:25 +01001460 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 return 0;
1462
Kay Sieverse17e0f52006-11-24 12:15:25 +01001463out_unreg_param:
1464 module_param_sysfs_remove(mod);
Kay Sievers270a6c42007-01-18 13:26:15 +01001465out_unreg_holders:
Greg Kroah-Hartman78a2d902007-12-20 08:13:05 -08001466 kobject_put(mod->holders_dir);
Kay Sievers270a6c42007-01-18 13:26:15 +01001467out_unreg:
Kay Sieverse17e0f52006-11-24 12:15:25 +01001468 kobject_put(&mod->mkobj.kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469 return err;
1470}
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001471
1472static void mod_sysfs_fini(struct module *mod)
1473{
1474 kobject_put(&mod->mkobj.kobj);
1475}
1476
1477#else /* CONFIG_SYSFS */
1478
1479static void mod_sysfs_fini(struct module *mod)
1480{
1481}
1482
1483#endif /* CONFIG_SYSFS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484
1485static void mod_kobject_remove(struct module *mod)
1486{
Matt Domschc988d2b2005-06-23 22:05:15 -07001487 module_remove_modinfo_attrs(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488 module_param_sysfs_remove(mod);
Greg Kroah-Hartman78a2d902007-12-20 08:13:05 -08001489 kobject_put(mod->mkobj.drivers_dir);
1490 kobject_put(mod->holders_dir);
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001491 mod_sysfs_fini(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492}
1493
1494/*
1495 * unlink the module with the whole machine is stopped with interrupts off
1496 * - this defends against kallsyms not taking locks
1497 */
1498static int __unlink_module(void *_mod)
1499{
1500 struct module *mod = _mod;
1501 list_del(&mod->list);
1502 return 0;
1503}
1504
Robert P. J. Day02a3e592007-05-09 07:26:28 +02001505/* Free a module, remove from lists, etc (must hold module_mutex). */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506static void free_module(struct module *mod)
1507{
Li Zefan7ead8b82009-08-17 16:56:28 +08001508 trace_module_free(mod);
1509
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510 /* Delete from various lists */
Rusty Russell9b1a4d32008-07-28 12:16:30 -05001511 stop_machine(__unlink_module, mod, NULL);
Roland McGrath6d760132007-10-16 23:26:40 -07001512 remove_notes_attrs(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513 remove_sect_attrs(mod);
1514 mod_kobject_remove(mod);
1515
1516 /* Arch-specific cleanup. */
1517 module_arch_cleanup(mod);
1518
1519 /* Module unload stuff */
1520 module_unload_free(mod);
1521
Rusty Russelle180a6b2009-03-31 13:05:29 -06001522 /* Free any allocated parameters. */
1523 destroy_params(mod->kp, mod->num_kp);
1524
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525 /* This may be NULL, but that's OK */
1526 module_free(mod, mod->module_init);
1527 kfree(mod->args);
1528 if (mod->percpu)
1529 percpu_modfree(mod->percpu);
Eric Dumazet720eba32009-02-03 13:31:36 +10301530#if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
1531 if (mod->refptr)
1532 percpu_modfree(mod->refptr);
1533#endif
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001534 /* Free lock-classes: */
1535 lockdep_free_key_range(mod->module_core, mod->core_size);
1536
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537 /* Finally, free the core (containing the module structure) */
1538 module_free(mod, mod->module_core);
Bernd Schmidteb8cdec2009-09-21 17:03:57 -07001539
1540#ifdef CONFIG_MPU
1541 update_protections(current->mm);
1542#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543}
1544
1545void *__symbol_get(const char *symbol)
1546{
1547 struct module *owner;
Tim Abbott414fd312008-12-05 19:03:56 -05001548 const struct kernel_symbol *sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549
Rusty Russell24da1cb2007-07-15 23:41:46 -07001550 preempt_disable();
Tim Abbott414fd312008-12-05 19:03:56 -05001551 sym = find_symbol(symbol, &owner, NULL, true, true);
1552 if (sym && strong_try_module_get(owner))
1553 sym = NULL;
Rusty Russell24da1cb2007-07-15 23:41:46 -07001554 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555
Tim Abbott414fd312008-12-05 19:03:56 -05001556 return sym ? (void *)sym->value : NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557}
1558EXPORT_SYMBOL_GPL(__symbol_get);
1559
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001560/*
1561 * Ensure that an exported symbol [global namespace] does not already exist
Robert P. J. Day02a3e592007-05-09 07:26:28 +02001562 * in the kernel or in some other module's exported symbol table.
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001563 */
1564static int verify_export_symbols(struct module *mod)
1565{
Rusty Russellb2111042008-05-01 21:15:00 -05001566 unsigned int i;
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001567 struct module *owner;
Rusty Russellb2111042008-05-01 21:15:00 -05001568 const struct kernel_symbol *s;
1569 struct {
1570 const struct kernel_symbol *sym;
1571 unsigned int num;
1572 } arr[] = {
1573 { mod->syms, mod->num_syms },
1574 { mod->gpl_syms, mod->num_gpl_syms },
1575 { mod->gpl_future_syms, mod->num_gpl_future_syms },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -05001576#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russellb2111042008-05-01 21:15:00 -05001577 { mod->unused_syms, mod->num_unused_syms },
1578 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -05001579#endif
Rusty Russellb2111042008-05-01 21:15:00 -05001580 };
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001581
Rusty Russellb2111042008-05-01 21:15:00 -05001582 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1583 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
Tim Abbott414fd312008-12-05 19:03:56 -05001584 if (find_symbol(s->name, &owner, NULL, true, false)) {
Rusty Russellb2111042008-05-01 21:15:00 -05001585 printk(KERN_ERR
1586 "%s: exports duplicate symbol %s"
1587 " (owned by %s)\n",
1588 mod->name, s->name, module_name(owner));
1589 return -ENOEXEC;
1590 }
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001591 }
Rusty Russellb2111042008-05-01 21:15:00 -05001592 }
1593 return 0;
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001594}
1595
Matti Linnanvuori9a4b9702007-11-08 08:37:38 -08001596/* Change all symbols so that st_value encodes the pointer directly. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597static int simplify_symbols(Elf_Shdr *sechdrs,
1598 unsigned int symindex,
1599 const char *strtab,
1600 unsigned int versindex,
1601 unsigned int pcpuindex,
1602 struct module *mod)
1603{
1604 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1605 unsigned long secbase;
1606 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1607 int ret = 0;
Tim Abbott414fd312008-12-05 19:03:56 -05001608 const struct kernel_symbol *ksym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609
1610 for (i = 1; i < n; i++) {
1611 switch (sym[i].st_shndx) {
1612 case SHN_COMMON:
1613 /* We compiled with -fno-common. These are not
1614 supposed to happen. */
1615 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1616 printk("%s: please compile with -fno-common\n",
1617 mod->name);
1618 ret = -ENOEXEC;
1619 break;
1620
1621 case SHN_ABS:
1622 /* Don't need to do anything */
1623 DEBUGP("Absolute symbol: 0x%08lx\n",
1624 (long)sym[i].st_value);
1625 break;
1626
1627 case SHN_UNDEF:
Tim Abbott414fd312008-12-05 19:03:56 -05001628 ksym = resolve_symbol(sechdrs, versindex,
1629 strtab + sym[i].st_name, mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630 /* Ok if resolved. */
Tim Abbott414fd312008-12-05 19:03:56 -05001631 if (ksym) {
1632 sym[i].st_value = ksym->value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001633 break;
Tim Abbott414fd312008-12-05 19:03:56 -05001634 }
1635
Linus Torvalds1da177e2005-04-16 15:20:36 -07001636 /* Ok if weak. */
1637 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1638 break;
1639
1640 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1641 mod->name, strtab + sym[i].st_name);
1642 ret = -ENOENT;
1643 break;
1644
1645 default:
1646 /* Divert to percpu allocation if a percpu var. */
1647 if (sym[i].st_shndx == pcpuindex)
1648 secbase = (unsigned long)mod->percpu;
1649 else
1650 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1651 sym[i].st_value += secbase;
1652 break;
1653 }
1654 }
1655
1656 return ret;
1657}
1658
Helge Deller088af9a2008-12-31 12:31:18 +01001659/* Additional bytes needed by arch in front of individual sections */
1660unsigned int __weak arch_mod_section_prepend(struct module *mod,
1661 unsigned int section)
1662{
1663 /* default implementation just returns zero */
1664 return 0;
1665}
1666
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667/* Update size with this section: return offset. */
Helge Deller088af9a2008-12-31 12:31:18 +01001668static long get_offset(struct module *mod, unsigned int *size,
1669 Elf_Shdr *sechdr, unsigned int section)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670{
1671 long ret;
1672
Helge Deller088af9a2008-12-31 12:31:18 +01001673 *size += arch_mod_section_prepend(mod, section);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001674 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1675 *size = ret + sechdr->sh_size;
1676 return ret;
1677}
1678
1679/* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1680 might -- code, read-only data, read-write data, small data. Tally
1681 sizes, and place the offsets into sh_entsize fields: high bit means it
1682 belongs in init. */
1683static void layout_sections(struct module *mod,
1684 const Elf_Ehdr *hdr,
1685 Elf_Shdr *sechdrs,
1686 const char *secstrings)
1687{
1688 static unsigned long const masks[][2] = {
1689 /* NOTE: all executable code must be the first section
1690 * in this array; otherwise modify the text_size
1691 * finder in the two loops below */
1692 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1693 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1694 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1695 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1696 };
1697 unsigned int m, i;
1698
1699 for (i = 0; i < hdr->e_shnum; i++)
1700 sechdrs[i].sh_entsize = ~0UL;
1701
1702 DEBUGP("Core section allocation order:\n");
1703 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1704 for (i = 0; i < hdr->e_shnum; ++i) {
1705 Elf_Shdr *s = &sechdrs[i];
1706
1707 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1708 || (s->sh_flags & masks[m][1])
1709 || s->sh_entsize != ~0UL
Rusty Russell49502672009-03-31 13:05:36 -06001710 || strstarts(secstrings + s->sh_name, ".init"))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001711 continue;
Helge Deller088af9a2008-12-31 12:31:18 +01001712 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713 DEBUGP("\t%s\n", secstrings + s->sh_name);
1714 }
1715 if (m == 0)
1716 mod->core_text_size = mod->core_size;
1717 }
1718
1719 DEBUGP("Init section allocation order:\n");
1720 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1721 for (i = 0; i < hdr->e_shnum; ++i) {
1722 Elf_Shdr *s = &sechdrs[i];
1723
1724 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1725 || (s->sh_flags & masks[m][1])
1726 || s->sh_entsize != ~0UL
Rusty Russell49502672009-03-31 13:05:36 -06001727 || !strstarts(secstrings + s->sh_name, ".init"))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728 continue;
Helge Deller088af9a2008-12-31 12:31:18 +01001729 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730 | INIT_OFFSET_MASK);
1731 DEBUGP("\t%s\n", secstrings + s->sh_name);
1732 }
1733 if (m == 0)
1734 mod->init_text_size = mod->init_size;
1735 }
1736}
1737
Linus Torvalds1da177e2005-04-16 15:20:36 -07001738static void set_license(struct module *mod, const char *license)
1739{
1740 if (!license)
1741 license = "unspecified";
1742
Florin Malitafa3ba2e82006-10-11 01:21:48 -07001743 if (!license_is_gpl_compatible(license)) {
Andi Kleen25ddbb12008-10-15 22:01:41 -07001744 if (!test_taint(TAINT_PROPRIETARY_MODULE))
Jan Dittmer1d4d2622006-10-28 10:38:38 -07001745 printk(KERN_WARNING "%s: module license '%s' taints "
Florin Malitafa3ba2e82006-10-11 01:21:48 -07001746 "kernel.\n", mod->name, license);
1747 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001748 }
1749}
1750
1751/* Parse tag=value strings from .modinfo section */
1752static char *next_string(char *string, unsigned long *secsize)
1753{
1754 /* Skip non-zero chars */
1755 while (string[0]) {
1756 string++;
1757 if ((*secsize)-- <= 1)
1758 return NULL;
1759 }
1760
1761 /* Skip any zero padding. */
1762 while (!string[0]) {
1763 string++;
1764 if ((*secsize)-- <= 1)
1765 return NULL;
1766 }
1767 return string;
1768}
1769
1770static char *get_modinfo(Elf_Shdr *sechdrs,
1771 unsigned int info,
1772 const char *tag)
1773{
1774 char *p;
1775 unsigned int taglen = strlen(tag);
1776 unsigned long size = sechdrs[info].sh_size;
1777
1778 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1779 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1780 return p + taglen + 1;
1781 }
1782 return NULL;
1783}
1784
Matt Domschc988d2b2005-06-23 22:05:15 -07001785static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1786 unsigned int infoindex)
1787{
1788 struct module_attribute *attr;
1789 int i;
1790
1791 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1792 if (attr->setup)
1793 attr->setup(mod,
1794 get_modinfo(sechdrs,
1795 infoindex,
1796 attr->attr.name));
1797 }
1798}
Matt Domschc988d2b2005-06-23 22:05:15 -07001799
Rusty Russella263f772009-09-25 00:32:58 -06001800static void free_modinfo(struct module *mod)
1801{
1802 struct module_attribute *attr;
1803 int i;
1804
1805 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1806 if (attr->free)
1807 attr->free(mod);
1808 }
1809}
1810
Linus Torvalds1da177e2005-04-16 15:20:36 -07001811#ifdef CONFIG_KALLSYMS
WANG Cong15bba372008-07-24 15:41:48 +01001812
1813/* lookup symbol in given range of kernel_symbols */
1814static const struct kernel_symbol *lookup_symbol(const char *name,
1815 const struct kernel_symbol *start,
1816 const struct kernel_symbol *stop)
1817{
1818 const struct kernel_symbol *ks = start;
1819 for (; ks < stop; ks++)
1820 if (strcmp(ks->name, name) == 0)
1821 return ks;
1822 return NULL;
1823}
1824
Tim Abbottca4787b2009-01-05 08:40:10 -06001825static int is_exported(const char *name, unsigned long value,
1826 const struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001827{
Tim Abbottca4787b2009-01-05 08:40:10 -06001828 const struct kernel_symbol *ks;
1829 if (!mod)
1830 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
Sam Ravnborg3fd68052006-02-08 21:16:45 +01001831 else
Tim Abbottca4787b2009-01-05 08:40:10 -06001832 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
1833 return ks != NULL && ks->value == value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001834}
1835
1836/* As per nm */
1837static char elf_type(const Elf_Sym *sym,
1838 Elf_Shdr *sechdrs,
1839 const char *secstrings,
1840 struct module *mod)
1841{
1842 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1843 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1844 return 'v';
1845 else
1846 return 'w';
1847 }
1848 if (sym->st_shndx == SHN_UNDEF)
1849 return 'U';
1850 if (sym->st_shndx == SHN_ABS)
1851 return 'a';
1852 if (sym->st_shndx >= SHN_LORESERVE)
1853 return '?';
1854 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1855 return 't';
1856 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1857 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1858 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1859 return 'r';
1860 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1861 return 'g';
1862 else
1863 return 'd';
1864 }
1865 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1866 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1867 return 's';
1868 else
1869 return 'b';
1870 }
Rusty Russell49502672009-03-31 13:05:36 -06001871 if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug"))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872 return 'n';
1873 return '?';
1874}
1875
Jan Beulich4a496222009-07-06 14:50:42 +01001876static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
1877 unsigned int shnum)
1878{
1879 const Elf_Shdr *sec;
1880
1881 if (src->st_shndx == SHN_UNDEF
1882 || src->st_shndx >= shnum
1883 || !src->st_name)
1884 return false;
1885
1886 sec = sechdrs + src->st_shndx;
1887 if (!(sec->sh_flags & SHF_ALLOC)
1888#ifndef CONFIG_KALLSYMS_ALL
1889 || !(sec->sh_flags & SHF_EXECINSTR)
1890#endif
1891 || (sec->sh_entsize & INIT_OFFSET_MASK))
1892 return false;
1893
1894 return true;
1895}
1896
1897static unsigned long layout_symtab(struct module *mod,
1898 Elf_Shdr *sechdrs,
1899 unsigned int symindex,
Jan Beulich554bdfe2009-07-06 14:51:44 +01001900 unsigned int strindex,
Jan Beulich4a496222009-07-06 14:50:42 +01001901 const Elf_Ehdr *hdr,
Jan Beulich554bdfe2009-07-06 14:51:44 +01001902 const char *secstrings,
1903 unsigned long *pstroffs,
1904 unsigned long *strmap)
Jan Beulich4a496222009-07-06 14:50:42 +01001905{
1906 unsigned long symoffs;
1907 Elf_Shdr *symsect = sechdrs + symindex;
Jan Beulich554bdfe2009-07-06 14:51:44 +01001908 Elf_Shdr *strsect = sechdrs + strindex;
Jan Beulich4a496222009-07-06 14:50:42 +01001909 const Elf_Sym *src;
Jan Beulich554bdfe2009-07-06 14:51:44 +01001910 const char *strtab;
Jan Beulich4a496222009-07-06 14:50:42 +01001911 unsigned int i, nsrc, ndst;
1912
1913 /* Put symbol section at end of init part of module. */
1914 symsect->sh_flags |= SHF_ALLOC;
1915 symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
1916 symindex) | INIT_OFFSET_MASK;
1917 DEBUGP("\t%s\n", secstrings + symsect->sh_name);
1918
1919 src = (void *)hdr + symsect->sh_offset;
1920 nsrc = symsect->sh_size / sizeof(*src);
Jan Beulich554bdfe2009-07-06 14:51:44 +01001921 strtab = (void *)hdr + strsect->sh_offset;
Jan Beulich4a496222009-07-06 14:50:42 +01001922 for (ndst = i = 1; i < nsrc; ++i, ++src)
Jan Beulich554bdfe2009-07-06 14:51:44 +01001923 if (is_core_symbol(src, sechdrs, hdr->e_shnum)) {
1924 unsigned int j = src->st_name;
1925
1926 while(!__test_and_set_bit(j, strmap) && strtab[j])
1927 ++j;
Jan Beulich4a496222009-07-06 14:50:42 +01001928 ++ndst;
Jan Beulich554bdfe2009-07-06 14:51:44 +01001929 }
Jan Beulich4a496222009-07-06 14:50:42 +01001930
1931 /* Append room for core symbols at end of core part. */
1932 symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
1933 mod->core_size = symoffs + ndst * sizeof(Elf_Sym);
1934
Jan Beulich554bdfe2009-07-06 14:51:44 +01001935 /* Put string table section at end of init part of module. */
1936 strsect->sh_flags |= SHF_ALLOC;
1937 strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
1938 strindex) | INIT_OFFSET_MASK;
1939 DEBUGP("\t%s\n", secstrings + strsect->sh_name);
1940
1941 /* Append room for core symbols' strings at end of core part. */
1942 *pstroffs = mod->core_size;
1943 __set_bit(0, strmap);
1944 mod->core_size += bitmap_weight(strmap, strsect->sh_size);
1945
Jan Beulich4a496222009-07-06 14:50:42 +01001946 return symoffs;
1947}
1948
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949static void add_kallsyms(struct module *mod,
1950 Elf_Shdr *sechdrs,
Jan Beulich4a496222009-07-06 14:50:42 +01001951 unsigned int shnum,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001952 unsigned int symindex,
1953 unsigned int strindex,
Jan Beulich4a496222009-07-06 14:50:42 +01001954 unsigned long symoffs,
Jan Beulich554bdfe2009-07-06 14:51:44 +01001955 unsigned long stroffs,
1956 const char *secstrings,
1957 unsigned long *strmap)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001958{
Jan Beulich4a496222009-07-06 14:50:42 +01001959 unsigned int i, ndst;
1960 const Elf_Sym *src;
1961 Elf_Sym *dst;
Jan Beulich554bdfe2009-07-06 14:51:44 +01001962 char *s;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001963
1964 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1965 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1966 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1967
1968 /* Set types up while we still have access to sections. */
1969 for (i = 0; i < mod->num_symtab; i++)
1970 mod->symtab[i].st_info
1971 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
Jan Beulich4a496222009-07-06 14:50:42 +01001972
1973 mod->core_symtab = dst = mod->module_core + symoffs;
1974 src = mod->symtab;
1975 *dst = *src;
1976 for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) {
1977 if (!is_core_symbol(src, sechdrs, shnum))
1978 continue;
1979 dst[ndst] = *src;
Jan Beulich554bdfe2009-07-06 14:51:44 +01001980 dst[ndst].st_name = bitmap_weight(strmap, dst[ndst].st_name);
Jan Beulich4a496222009-07-06 14:50:42 +01001981 ++ndst;
1982 }
1983 mod->core_num_syms = ndst;
Jan Beulich554bdfe2009-07-06 14:51:44 +01001984
1985 mod->core_strtab = s = mod->module_core + stroffs;
1986 for (*s = 0, i = 1; i < sechdrs[strindex].sh_size; ++i)
1987 if (test_bit(i, strmap))
1988 *++s = mod->strtab[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001989}
1990#else
Jan Beulich4a496222009-07-06 14:50:42 +01001991static inline unsigned long layout_symtab(struct module *mod,
1992 Elf_Shdr *sechdrs,
1993 unsigned int symindex,
Jan Beulich554bdfe2009-07-06 14:51:44 +01001994 unsigned int strindex,
Jan Beulich4a496222009-07-06 14:50:42 +01001995 const Elf_Hdr *hdr,
Jan Beulich554bdfe2009-07-06 14:51:44 +01001996 const char *secstrings,
1997 unsigned long *pstroffs,
1998 unsigned long *strmap)
Jan Beulich4a496222009-07-06 14:50:42 +01001999{
2000}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002001static inline void add_kallsyms(struct module *mod,
2002 Elf_Shdr *sechdrs,
Jan Beulich4a496222009-07-06 14:50:42 +01002003 unsigned int shnum,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002004 unsigned int symindex,
2005 unsigned int strindex,
Jan Beulich4a496222009-07-06 14:50:42 +01002006 unsigned long symoffs,
Jan Beulich554bdfe2009-07-06 14:51:44 +01002007 unsigned long stroffs,
2008 const char *secstrings,
2009 const unsigned long *strmap)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002010{
2011}
2012#endif /* CONFIG_KALLSYMS */
2013
Jason Barone9d376f2009-02-05 11:51:38 -05002014static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
Rusty Russell5e458cc2008-10-22 10:00:13 -05002015{
Jason Barone9d376f2009-02-05 11:51:38 -05002016#ifdef CONFIG_DYNAMIC_DEBUG
2017 if (ddebug_add_module(debug, num, debug->modname))
2018 printk(KERN_ERR "dynamic debug error adding module: %s\n",
2019 debug->modname);
2020#endif
Rusty Russell5e458cc2008-10-22 10:00:13 -05002021}
Jason Baron346e15b2008-08-12 16:46:19 -04002022
Rusty Russell3a642e92008-07-22 19:24:28 -05002023static void *module_alloc_update_bounds(unsigned long size)
2024{
2025 void *ret = module_alloc(size);
2026
2027 if (ret) {
2028 /* Update module bounds. */
2029 if ((unsigned long)ret < module_addr_min)
2030 module_addr_min = (unsigned long)ret;
2031 if ((unsigned long)ret + size > module_addr_max)
2032 module_addr_max = (unsigned long)ret + size;
2033 }
2034 return ret;
2035}
2036
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002037#ifdef CONFIG_DEBUG_KMEMLEAK
2038static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
2039 Elf_Shdr *sechdrs, char *secstrings)
2040{
2041 unsigned int i;
2042
2043 /* only scan the sections containing data */
2044 kmemleak_scan_area(mod->module_core, (unsigned long)mod -
2045 (unsigned long)mod->module_core,
2046 sizeof(struct module), GFP_KERNEL);
2047
2048 for (i = 1; i < hdr->e_shnum; i++) {
2049 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
2050 continue;
2051 if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0
2052 && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0)
2053 continue;
2054
2055 kmemleak_scan_area(mod->module_core, sechdrs[i].sh_addr -
2056 (unsigned long)mod->module_core,
2057 sechdrs[i].sh_size, GFP_KERNEL);
2058 }
2059}
2060#else
2061static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
2062 Elf_Shdr *sechdrs, char *secstrings)
2063{
2064}
2065#endif
2066
Linus Torvalds1da177e2005-04-16 15:20:36 -07002067/* Allocate and load the module: note that size of section 0 is always
2068 zero, and we rely on this for optional sections. */
Linus Torvaldsffb4ba72008-08-25 11:10:26 -07002069static noinline struct module *load_module(void __user *umod,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002070 unsigned long len,
2071 const char __user *uargs)
2072{
2073 Elf_Ehdr *hdr;
2074 Elf_Shdr *sechdrs;
2075 char *secstrings, *args, *modmagic, *strtab = NULL;
Greg Kroah-Hartman061b1bd2008-09-24 14:46:44 -07002076 char *staging;
Andrew Morton84860f92006-06-28 04:26:46 -07002077 unsigned int i;
2078 unsigned int symindex = 0;
2079 unsigned int strindex = 0;
Rusty Russell5e458cc2008-10-22 10:00:13 -05002080 unsigned int modindex, versindex, infoindex, pcpuindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002081 struct module *mod;
2082 long err = 0;
2083 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
Jan Beulich4a496222009-07-06 14:50:42 +01002084#ifdef CONFIG_KALLSYMS
Jan Beulich554bdfe2009-07-06 14:51:44 +01002085 unsigned long symoffs, stroffs, *strmap;
Jan Beulich4a496222009-07-06 14:50:42 +01002086#endif
Thomas Koeller378bac82005-09-06 15:17:11 -07002087 mm_segment_t old_fs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002088
2089 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
2090 umod, len, uargs);
2091 if (len < sizeof(*hdr))
2092 return ERR_PTR(-ENOEXEC);
2093
2094 /* Suck in entire file: we'll want most of it. */
2095 /* vmalloc barfs on "unusual" numbers. Check here */
2096 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
2097 return ERR_PTR(-ENOMEM);
Heiko Carstens9e018922008-12-22 12:36:31 +01002098
Linus Torvalds1da177e2005-04-16 15:20:36 -07002099 if (copy_from_user(hdr, umod, len) != 0) {
2100 err = -EFAULT;
2101 goto free_hdr;
2102 }
2103
2104 /* Sanity checks against insmoding binaries or wrong arch,
2105 weird elf version */
Cyrill Gorcunovc4ea6fc2008-05-14 16:27:29 -07002106 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
Linus Torvalds1da177e2005-04-16 15:20:36 -07002107 || hdr->e_type != ET_REL
2108 || !elf_check_arch(hdr)
2109 || hdr->e_shentsize != sizeof(*sechdrs)) {
2110 err = -ENOEXEC;
2111 goto free_hdr;
2112 }
2113
2114 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
2115 goto truncated;
2116
2117 /* Convenience variables */
2118 sechdrs = (void *)hdr + hdr->e_shoff;
2119 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
2120 sechdrs[0].sh_addr = 0;
2121
2122 for (i = 1; i < hdr->e_shnum; i++) {
2123 if (sechdrs[i].sh_type != SHT_NOBITS
2124 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
2125 goto truncated;
2126
2127 /* Mark all sections sh_addr with their address in the
2128 temporary image. */
2129 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
2130
2131 /* Internal symbols and strings. */
2132 if (sechdrs[i].sh_type == SHT_SYMTAB) {
2133 symindex = i;
2134 strindex = sechdrs[i].sh_link;
2135 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
2136 }
2137#ifndef CONFIG_MODULE_UNLOAD
2138 /* Don't load .exit sections */
Rusty Russell49502672009-03-31 13:05:36 -06002139 if (strstarts(secstrings+sechdrs[i].sh_name, ".exit"))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002140 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
2141#endif
2142 }
2143
2144 modindex = find_sec(hdr, sechdrs, secstrings,
2145 ".gnu.linkonce.this_module");
2146 if (!modindex) {
2147 printk(KERN_WARNING "No module found in object\n");
2148 err = -ENOEXEC;
2149 goto free_hdr;
2150 }
Rusty Russell5e458cc2008-10-22 10:00:13 -05002151 /* This is temporary: point mod into copy of data. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002152 mod = (void *)sechdrs[modindex].sh_addr;
2153
2154 if (symindex == 0) {
2155 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
2156 mod->name);
2157 err = -ENOEXEC;
2158 goto free_hdr;
2159 }
2160
Linus Torvalds1da177e2005-04-16 15:20:36 -07002161 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
2162 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
2163 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
2164
Rusty Russellea01e792008-03-13 09:02:17 +00002165 /* Don't keep modinfo and version sections. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002166 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
Rusty Russellea01e792008-03-13 09:02:17 +00002167 sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002168
2169 /* Check module struct version now, before we try to use module. */
2170 if (!check_modstruct_version(sechdrs, versindex, mod)) {
2171 err = -ENOEXEC;
2172 goto free_hdr;
2173 }
2174
2175 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
2176 /* This is allowed: modprobe --force will invalidate it. */
2177 if (!modmagic) {
Rusty Russellc6e665c2009-03-31 13:05:33 -06002178 err = try_to_force_load(mod, "bad vermagic");
Linus Torvalds826e4502008-05-04 17:04:16 -07002179 if (err)
2180 goto free_hdr;
Rusty Russell91e37a72008-05-09 16:25:28 +10002181 } else if (!same_magic(modmagic, vermagic, versindex)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002182 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
2183 mod->name, modmagic, vermagic);
2184 err = -ENOEXEC;
2185 goto free_hdr;
2186 }
2187
Greg Kroah-Hartman061b1bd2008-09-24 14:46:44 -07002188 staging = get_modinfo(sechdrs, infoindex, "staging");
2189 if (staging) {
2190 add_taint_module(mod, TAINT_CRAP);
2191 printk(KERN_WARNING "%s: module is from the staging directory,"
2192 " the quality is unknown, you have been warned.\n",
2193 mod->name);
2194 }
2195
Linus Torvalds1da177e2005-04-16 15:20:36 -07002196 /* Now copy in args */
Davi Arnaut24277dd2006-03-24 03:18:43 -08002197 args = strndup_user(uargs, ~0UL >> 1);
2198 if (IS_ERR(args)) {
2199 err = PTR_ERR(args);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002200 goto free_hdr;
2201 }
Andrew Morton8e08b752006-02-07 12:58:45 -08002202
Jan Beulich554bdfe2009-07-06 14:51:44 +01002203 strmap = kzalloc(BITS_TO_LONGS(sechdrs[strindex].sh_size)
2204 * sizeof(long), GFP_KERNEL);
2205 if (!strmap) {
2206 err = -ENOMEM;
2207 goto free_mod;
2208 }
2209
Linus Torvalds1da177e2005-04-16 15:20:36 -07002210 if (find_module(mod->name)) {
2211 err = -EEXIST;
2212 goto free_mod;
2213 }
2214
2215 mod->state = MODULE_STATE_COMING;
2216
2217 /* Allow arches to frob section contents and sizes. */
2218 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
2219 if (err < 0)
2220 goto free_mod;
2221
2222 if (pcpuindex) {
2223 /* We have a special allocation for this section. */
2224 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
Rusty Russell842bbaa2005-08-01 21:11:47 -07002225 sechdrs[pcpuindex].sh_addralign,
2226 mod->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002227 if (!percpu) {
2228 err = -ENOMEM;
Masami Hiramatsu6e2b7572009-03-16 18:13:36 -04002229 goto free_mod;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002230 }
2231 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2232 mod->percpu = percpu;
2233 }
2234
2235 /* Determine total sizes, and put offsets in sh_entsize. For now
2236 this is done generically; there doesn't appear to be any
2237 special cases for the architectures. */
2238 layout_sections(mod, hdr, sechdrs, secstrings);
Jan Beulich554bdfe2009-07-06 14:51:44 +01002239 symoffs = layout_symtab(mod, sechdrs, symindex, strindex, hdr,
2240 secstrings, &stroffs, strmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002241
2242 /* Do the allocs. */
Rusty Russell3a642e92008-07-22 19:24:28 -05002243 ptr = module_alloc_update_bounds(mod->core_size);
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002244 /*
2245 * The pointer to this block is stored in the module structure
2246 * which is inside the block. Just mark it as not being a
2247 * leak.
2248 */
2249 kmemleak_not_leak(ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002250 if (!ptr) {
2251 err = -ENOMEM;
2252 goto free_percpu;
2253 }
2254 memset(ptr, 0, mod->core_size);
2255 mod->module_core = ptr;
2256
Rusty Russell3a642e92008-07-22 19:24:28 -05002257 ptr = module_alloc_update_bounds(mod->init_size);
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002258 /*
2259 * The pointer to this block is stored in the module structure
2260 * which is inside the block. This block doesn't need to be
2261 * scanned as it contains data and code that will be freed
2262 * after the module is initialized.
2263 */
2264 kmemleak_ignore(ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002265 if (!ptr && mod->init_size) {
2266 err = -ENOMEM;
2267 goto free_core;
2268 }
2269 memset(ptr, 0, mod->init_size);
2270 mod->module_init = ptr;
2271
2272 /* Transfer each section which specifies SHF_ALLOC */
2273 DEBUGP("final section addresses:\n");
2274 for (i = 0; i < hdr->e_shnum; i++) {
2275 void *dest;
2276
2277 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
2278 continue;
2279
2280 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
2281 dest = mod->module_init
2282 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
2283 else
2284 dest = mod->module_core + sechdrs[i].sh_entsize;
2285
2286 if (sechdrs[i].sh_type != SHT_NOBITS)
2287 memcpy(dest, (void *)sechdrs[i].sh_addr,
2288 sechdrs[i].sh_size);
2289 /* Update sh_addr to point to copy in image. */
2290 sechdrs[i].sh_addr = (unsigned long)dest;
2291 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
2292 }
2293 /* Module has been moved. */
2294 mod = (void *)sechdrs[modindex].sh_addr;
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002295 kmemleak_load_module(mod, hdr, sechdrs, secstrings);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002296
Masami Hiramatsu6e2b7572009-03-16 18:13:36 -04002297#if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
2298 mod->refptr = percpu_modalloc(sizeof(local_t), __alignof__(local_t),
2299 mod->name);
2300 if (!mod->refptr) {
2301 err = -ENOMEM;
2302 goto free_init;
2303 }
2304#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002305 /* Now we've moved module, initialize linked lists, etc. */
2306 module_unload_init(mod);
2307
Kay Sievers97c146e2007-11-29 23:46:11 +01002308 /* add kobject, so we can reference it. */
Akinobu Mitad58ae672007-10-16 23:30:27 -07002309 err = mod_sysfs_init(mod);
2310 if (err)
Kay Sievers97c146e2007-11-29 23:46:11 +01002311 goto free_unload;
Kay Sievers270a6c42007-01-18 13:26:15 +01002312
Linus Torvalds1da177e2005-04-16 15:20:36 -07002313 /* Set up license info based on the info section */
2314 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
2315
Pavel Roskin9b37ccf2008-02-28 17:11:02 -05002316 /*
2317 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2318 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2319 * using GPL-only symbols it needs.
2320 */
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002321 if (strcmp(mod->name, "ndiswrapper") == 0)
Pavel Roskin9b37ccf2008-02-28 17:11:02 -05002322 add_taint(TAINT_PROPRIETARY_MODULE);
2323
2324 /* driverloader was caught wrongly pretending to be under GPL */
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002325 if (strcmp(mod->name, "driverloader") == 0)
2326 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
Dave Jones9841d612006-01-08 01:03:41 -08002327
Matt Domschc988d2b2005-06-23 22:05:15 -07002328 /* Set up MODINFO_ATTR fields */
2329 setup_modinfo(mod, sechdrs, infoindex);
Matt Domschc988d2b2005-06-23 22:05:15 -07002330
Linus Torvalds1da177e2005-04-16 15:20:36 -07002331 /* Fix up syms, so that st_value is a pointer to location. */
2332 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
2333 mod);
2334 if (err < 0)
2335 goto cleanup;
2336
Rusty Russell5e458cc2008-10-22 10:00:13 -05002337 /* Now we've got everything in the final locations, we can
2338 * find optional sections. */
Rusty Russelle180a6b2009-03-31 13:05:29 -06002339 mod->kp = section_objs(hdr, sechdrs, secstrings, "__param",
2340 sizeof(*mod->kp), &mod->num_kp);
Rusty Russell5e458cc2008-10-22 10:00:13 -05002341 mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
2342 sizeof(*mod->syms), &mod->num_syms);
2343 mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
2344 mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl",
2345 sizeof(*mod->gpl_syms),
2346 &mod->num_gpl_syms);
2347 mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl");
2348 mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings,
2349 "__ksymtab_gpl_future",
2350 sizeof(*mod->gpl_future_syms),
2351 &mod->num_gpl_future_syms);
2352 mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings,
2353 "__kcrctab_gpl_future");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002354
Denys Vlasenkof7f5b672008-07-22 19:24:26 -05002355#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russell5e458cc2008-10-22 10:00:13 -05002356 mod->unused_syms = section_objs(hdr, sechdrs, secstrings,
2357 "__ksymtab_unused",
2358 sizeof(*mod->unused_syms),
2359 &mod->num_unused_syms);
2360 mod->unused_crcs = section_addr(hdr, sechdrs, secstrings,
2361 "__kcrctab_unused");
2362 mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings,
2363 "__ksymtab_unused_gpl",
2364 sizeof(*mod->unused_gpl_syms),
2365 &mod->num_unused_gpl_syms);
2366 mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
2367 "__kcrctab_unused_gpl");
2368#endif
Peter Oberparleiterb99b87f2009-06-17 16:28:03 -07002369#ifdef CONFIG_CONSTRUCTORS
2370 mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors",
2371 sizeof(*mod->ctors), &mod->num_ctors);
2372#endif
Rusty Russell5e458cc2008-10-22 10:00:13 -05002373
Rusty Russell5e458cc2008-10-22 10:00:13 -05002374#ifdef CONFIG_TRACEPOINTS
2375 mod->tracepoints = section_objs(hdr, sechdrs, secstrings,
2376 "__tracepoints",
2377 sizeof(*mod->tracepoints),
2378 &mod->num_tracepoints);
Denys Vlasenkof7f5b672008-07-22 19:24:26 -05002379#endif
Steven Rostedt6d723732009-04-10 14:53:50 -04002380#ifdef CONFIG_EVENT_TRACING
2381 mod->trace_events = section_objs(hdr, sechdrs, secstrings,
2382 "_ftrace_events",
2383 sizeof(*mod->trace_events),
2384 &mod->num_trace_events);
2385#endif
Steven Rostedt93eb6772009-04-15 13:24:06 -04002386#ifdef CONFIG_FTRACE_MCOUNT_RECORD
2387 /* sechdrs[0].sh_size is always zero */
2388 mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings,
2389 "__mcount_loc",
2390 sizeof(*mod->ftrace_callsites),
2391 &mod->num_ftrace_callsites);
2392#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002393#ifdef CONFIG_MODVERSIONS
Rusty Russell5e458cc2008-10-22 10:00:13 -05002394 if ((mod->num_syms && !mod->crcs)
2395 || (mod->num_gpl_syms && !mod->gpl_crcs)
2396 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
Denys Vlasenkof7f5b672008-07-22 19:24:26 -05002397#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russell5e458cc2008-10-22 10:00:13 -05002398 || (mod->num_unused_syms && !mod->unused_crcs)
2399 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
Denys Vlasenkof7f5b672008-07-22 19:24:26 -05002400#endif
2401 ) {
Rusty Russellc6e665c2009-03-31 13:05:33 -06002402 err = try_to_force_load(mod,
2403 "no versions for exported symbols");
Linus Torvalds826e4502008-05-04 17:04:16 -07002404 if (err)
2405 goto cleanup;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002406 }
2407#endif
2408
2409 /* Now do relocations. */
2410 for (i = 1; i < hdr->e_shnum; i++) {
2411 const char *strtab = (char *)sechdrs[strindex].sh_addr;
2412 unsigned int info = sechdrs[i].sh_info;
2413
2414 /* Not a valid relocation section? */
2415 if (info >= hdr->e_shnum)
2416 continue;
2417
2418 /* Don't bother with non-allocated sections */
2419 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
2420 continue;
2421
2422 if (sechdrs[i].sh_type == SHT_REL)
2423 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
2424 else if (sechdrs[i].sh_type == SHT_RELA)
2425 err = apply_relocate_add(sechdrs, strtab, symindex, i,
2426 mod);
2427 if (err < 0)
2428 goto cleanup;
2429 }
2430
Ashutosh Naikeea8b542006-01-08 01:04:25 -08002431 /* Find duplicate symbols */
2432 err = verify_export_symbols(mod);
Ashutosh Naikeea8b542006-01-08 01:04:25 -08002433 if (err < 0)
2434 goto cleanup;
2435
Linus Torvalds1da177e2005-04-16 15:20:36 -07002436 /* Set up and sort exception table */
Rusty Russell5e458cc2008-10-22 10:00:13 -05002437 mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table",
2438 sizeof(*mod->extable), &mod->num_exentries);
2439 sort_extable(mod->extable, mod->extable + mod->num_exentries);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002440
2441 /* Finally, copy percpu area over. */
2442 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
2443 sechdrs[pcpuindex].sh_size);
2444
Jan Beulich4a496222009-07-06 14:50:42 +01002445 add_kallsyms(mod, sechdrs, hdr->e_shnum, symindex, strindex,
Jan Beulich554bdfe2009-07-06 14:51:44 +01002446 symoffs, stroffs, secstrings, strmap);
2447 kfree(strmap);
2448 strmap = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002449
Mathieu Desnoyers97e1c182008-07-18 12:16:16 -04002450 if (!mod->taints) {
Jason Barone9d376f2009-02-05 11:51:38 -05002451 struct _ddebug *debug;
Rusty Russell5e458cc2008-10-22 10:00:13 -05002452 unsigned int num_debug;
2453
Rusty Russell5e458cc2008-10-22 10:00:13 -05002454 debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
2455 sizeof(*debug), &num_debug);
Jason Barone9d376f2009-02-05 11:51:38 -05002456 if (debug)
2457 dynamic_debug_setup(debug, num_debug);
Mathieu Desnoyers97e1c182008-07-18 12:16:16 -04002458 }
Steven Rostedt90d595f2008-08-14 15:45:09 -04002459
Linus Torvalds1da177e2005-04-16 15:20:36 -07002460 err = module_finalize(hdr, sechdrs, mod);
2461 if (err < 0)
2462 goto cleanup;
2463
Thomas Koeller378bac82005-09-06 15:17:11 -07002464 /* flush the icache in correct context */
2465 old_fs = get_fs();
2466 set_fs(KERNEL_DS);
2467
2468 /*
2469 * Flush the instruction cache, since we've played with text.
2470 * Do it before processing of module parameters, so the module
2471 * can provide parameter accessor functions of its own.
2472 */
2473 if (mod->module_init)
2474 flush_icache_range((unsigned long)mod->module_init,
2475 (unsigned long)mod->module_init
2476 + mod->init_size);
2477 flush_icache_range((unsigned long)mod->module_core,
2478 (unsigned long)mod->module_core + mod->core_size);
2479
2480 set_fs(old_fs);
2481
Linus Torvalds1da177e2005-04-16 15:20:36 -07002482 mod->args = args;
Rusty Russell5e458cc2008-10-22 10:00:13 -05002483 if (section_addr(hdr, sechdrs, secstrings, "__obsparm"))
Rusty Russell8d3b33f2006-03-25 03:07:05 -08002484 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2485 mod->name);
2486
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002487 /* Now sew it into the lists so we can get lockdep and oops
Andi Kleend72b3752008-08-30 10:09:00 +02002488 * info during argument parsing. Noone should access us, since
2489 * strong_try_module_get() will fail.
2490 * lockdep/oops can run asynchronous, so use the RCU list insertion
2491 * function to insert in a way safe to concurrent readers.
2492 * The mutex protects against concurrent writers.
2493 */
2494 list_add_rcu(&mod->list, &modules);
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002495
Rusty Russelle180a6b2009-03-31 13:05:29 -06002496 err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002497 if (err < 0)
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002498 goto unlink;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002499
Rusty Russelle180a6b2009-03-31 13:05:29 -06002500 err = mod_sysfs_setup(mod, mod->kp, mod->num_kp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002501 if (err < 0)
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002502 goto unlink;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002503 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
Roland McGrath6d760132007-10-16 23:26:40 -07002504 add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002505
2506 /* Get rid of temporary copy */
2507 vfree(hdr);
2508
Li Zefan7ead8b82009-08-17 16:56:28 +08002509 trace_module_load(mod);
2510
Linus Torvalds1da177e2005-04-16 15:20:36 -07002511 /* Done! */
2512 return mod;
2513
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002514 unlink:
Rusty Russelle91defa2009-03-31 13:05:35 -06002515 /* Unlink carefully: kallsyms could be walking list. */
2516 list_del_rcu(&mod->list);
2517 synchronize_sched();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002518 module_arch_cleanup(mod);
2519 cleanup:
Rusty Russella263f772009-09-25 00:32:58 -06002520 free_modinfo(mod);
Kay Sievers97c146e2007-11-29 23:46:11 +01002521 kobject_del(&mod->mkobj.kobj);
2522 kobject_put(&mod->mkobj.kobj);
2523 free_unload:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002524 module_unload_free(mod);
Eric Dumazet720eba32009-02-03 13:31:36 +10302525#if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
2526 percpu_modfree(mod->refptr);
Rusty Russellffa9f122009-09-25 00:32:59 -06002527 free_init:
Eric Dumazet720eba32009-02-03 13:31:36 +10302528#endif
Masami Hiramatsu6e2b7572009-03-16 18:13:36 -04002529 module_free(mod, mod->module_init);
2530 free_core:
2531 module_free(mod, mod->module_core);
2532 /* mod will be freed with core. Don't access it beyond this line! */
2533 free_percpu:
2534 if (percpu)
2535 percpu_modfree(percpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002536 free_mod:
2537 kfree(args);
Jan Beulich554bdfe2009-07-06 14:51:44 +01002538 kfree(strmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002539 free_hdr:
2540 vfree(hdr);
Jayachandran C6fe2e702006-01-06 00:19:54 -08002541 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002542
2543 truncated:
2544 printk(KERN_ERR "Module len %lu truncated\n", len);
2545 err = -ENOEXEC;
2546 goto free_hdr;
2547}
2548
Peter Oberparleiterb99b87f2009-06-17 16:28:03 -07002549/* Call module constructors. */
2550static void do_mod_ctors(struct module *mod)
2551{
2552#ifdef CONFIG_CONSTRUCTORS
2553 unsigned long i;
2554
2555 for (i = 0; i < mod->num_ctors; i++)
2556 mod->ctors[i]();
2557#endif
2558}
2559
Linus Torvalds1da177e2005-04-16 15:20:36 -07002560/* This is where the real work happens */
Heiko Carstens17da2bd2009-01-14 14:14:10 +01002561SYSCALL_DEFINE3(init_module, void __user *, umod,
2562 unsigned long, len, const char __user *, uargs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002563{
2564 struct module *mod;
2565 int ret = 0;
2566
2567 /* Must have permission */
Kees Cook3d433212009-04-02 15:49:29 -07002568 if (!capable(CAP_SYS_MODULE) || modules_disabled)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002569 return -EPERM;
2570
2571 /* Only one module load at a time, please */
Ashutosh Naik6389a382006-03-23 03:00:46 -08002572 if (mutex_lock_interruptible(&module_mutex) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002573 return -EINTR;
2574
2575 /* Do all the hard work */
2576 mod = load_module(umod, len, uargs);
2577 if (IS_ERR(mod)) {
Ashutosh Naik6389a382006-03-23 03:00:46 -08002578 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002579 return PTR_ERR(mod);
2580 }
2581
Linus Torvalds1da177e2005-04-16 15:20:36 -07002582 /* Drop lock so they can recurse */
Ashutosh Naik6389a382006-03-23 03:00:46 -08002583 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002584
Alan Sterne041c682006-03-27 01:16:30 -08002585 blocking_notifier_call_chain(&module_notify_list,
2586 MODULE_STATE_COMING, mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002587
Peter Oberparleiterb99b87f2009-06-17 16:28:03 -07002588 do_mod_ctors(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002589 /* Start the module */
2590 if (mod->init != NULL)
Arjan van de Ven59f94152008-07-30 12:49:02 -07002591 ret = do_one_initcall(mod->init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002592 if (ret < 0) {
2593 /* Init routine failed: abort. Try to protect us from
2594 buggy refcounters. */
2595 mod->state = MODULE_STATE_GOING;
Paul E. McKenneyfbd568a3e2005-05-01 08:59:04 -07002596 synchronize_sched();
Rusty Russellaf49d922007-10-16 23:26:27 -07002597 module_put(mod);
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +02002598 blocking_notifier_call_chain(&module_notify_list,
2599 MODULE_STATE_GOING, mod);
Rusty Russellaf49d922007-10-16 23:26:27 -07002600 mutex_lock(&module_mutex);
2601 free_module(mod);
2602 mutex_unlock(&module_mutex);
Rusty Russellc9a3ba52008-01-29 17:13:18 -05002603 wake_up(&module_wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002604 return ret;
2605 }
Alexey Dobriyane24e2e62008-03-10 11:43:53 -07002606 if (ret > 0) {
Joe Perchesad361c92009-07-06 13:05:40 -07002607 printk(KERN_WARNING
2608"%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
2609"%s: loading module anyway...\n",
Alexey Dobriyane24e2e62008-03-10 11:43:53 -07002610 __func__, mod->name, ret,
2611 __func__);
2612 dump_stack();
2613 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002614
Rusty Russell6c5db222008-03-10 11:43:52 -07002615 /* Now it's a first class citizen! Wake up anyone waiting for it. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002616 mod->state = MODULE_STATE_LIVE;
Rusty Russell6c5db222008-03-10 11:43:52 -07002617 wake_up(&module_wq);
Masami Hiramatsu0deddf42009-01-06 14:41:54 -08002618 blocking_notifier_call_chain(&module_notify_list,
2619 MODULE_STATE_LIVE, mod);
Rusty Russell6c5db222008-03-10 11:43:52 -07002620
Linus Torvaldsd6de2c82009-04-10 12:17:41 -07002621 /* We need to finish all async code before the module init sequence is done */
2622 async_synchronize_full();
2623
Rusty Russell6c5db222008-03-10 11:43:52 -07002624 mutex_lock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002625 /* Drop initial reference. */
2626 module_put(mod);
Rusty Russellad6561d2009-06-12 21:47:03 -06002627 trim_init_extable(mod);
Jan Beulich4a496222009-07-06 14:50:42 +01002628#ifdef CONFIG_KALLSYMS
2629 mod->num_symtab = mod->core_num_syms;
2630 mod->symtab = mod->core_symtab;
Jan Beulich554bdfe2009-07-06 14:51:44 +01002631 mod->strtab = mod->core_strtab;
Jan Beulich4a496222009-07-06 14:50:42 +01002632#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002633 module_free(mod, mod->module_init);
2634 mod->module_init = NULL;
2635 mod->init_size = 0;
2636 mod->init_text_size = 0;
Ashutosh Naik6389a382006-03-23 03:00:46 -08002637 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002638
2639 return 0;
2640}
2641
2642static inline int within(unsigned long addr, void *start, unsigned long size)
2643{
2644 return ((void *)addr >= start && (void *)addr < start + size);
2645}
2646
2647#ifdef CONFIG_KALLSYMS
2648/*
2649 * This ignores the intensely annoying "mapping symbols" found
2650 * in ARM ELF files: $a, $t and $d.
2651 */
2652static inline int is_arm_mapping_symbol(const char *str)
2653{
Daniel Walker22a8bde2007-10-18 03:06:07 -07002654 return str[0] == '$' && strchr("atd", str[1])
Linus Torvalds1da177e2005-04-16 15:20:36 -07002655 && (str[2] == '\0' || str[2] == '.');
2656}
2657
2658static const char *get_ksymbol(struct module *mod,
2659 unsigned long addr,
2660 unsigned long *size,
2661 unsigned long *offset)
2662{
2663 unsigned int i, best = 0;
2664 unsigned long nextval;
2665
2666 /* At worse, next value is at end of module */
Masami Hiramatsua06f6212009-01-06 14:41:49 -08002667 if (within_module_init(addr, mod))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002668 nextval = (unsigned long)mod->module_init+mod->init_text_size;
Daniel Walker22a8bde2007-10-18 03:06:07 -07002669 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07002670 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2671
2672 /* Scan for closest preceeding symbol, and next symbol. (ELF
Daniel Walker22a8bde2007-10-18 03:06:07 -07002673 starts real symbols at 1). */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002674 for (i = 1; i < mod->num_symtab; i++) {
2675 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2676 continue;
2677
2678 /* We ignore unnamed symbols: they're uninformative
2679 * and inserted at a whim. */
2680 if (mod->symtab[i].st_value <= addr
2681 && mod->symtab[i].st_value > mod->symtab[best].st_value
2682 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2683 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2684 best = i;
2685 if (mod->symtab[i].st_value > addr
2686 && mod->symtab[i].st_value < nextval
2687 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2688 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2689 nextval = mod->symtab[i].st_value;
2690 }
2691
2692 if (!best)
2693 return NULL;
2694
Alexey Dobriyanffb45122007-05-08 00:28:41 -07002695 if (size)
2696 *size = nextval - mod->symtab[best].st_value;
2697 if (offset)
2698 *offset = addr - mod->symtab[best].st_value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002699 return mod->strtab + mod->symtab[best].st_name;
2700}
2701
Rusty Russell6dd06c92008-01-29 17:13:22 -05002702/* For kallsyms to ask for address resolution. NULL means not found. Careful
2703 * not to lock to avoid deadlock on oopses, simply disable preemption. */
Andrew Morton92dfc9d2008-02-08 04:18:43 -08002704const char *module_address_lookup(unsigned long addr,
Rusty Russell6dd06c92008-01-29 17:13:22 -05002705 unsigned long *size,
2706 unsigned long *offset,
2707 char **modname,
2708 char *namebuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002709{
2710 struct module *mod;
Rusty Russellcb2a5202008-01-14 00:55:03 -08002711 const char *ret = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002712
Rusty Russellcb2a5202008-01-14 00:55:03 -08002713 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02002714 list_for_each_entry_rcu(mod, &modules, list) {
Masami Hiramatsua06f6212009-01-06 14:41:49 -08002715 if (within_module_init(addr, mod) ||
2716 within_module_core(addr, mod)) {
Franck Bui-Huuffc50892006-10-03 01:13:48 -07002717 if (modname)
2718 *modname = mod->name;
Rusty Russellcb2a5202008-01-14 00:55:03 -08002719 ret = get_ksymbol(mod, addr, size, offset);
2720 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002721 }
2722 }
Rusty Russell6dd06c92008-01-29 17:13:22 -05002723 /* Make a copy in here where it's safe */
2724 if (ret) {
2725 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
2726 ret = namebuf;
2727 }
Rusty Russellcb2a5202008-01-14 00:55:03 -08002728 preempt_enable();
Andrew Morton92dfc9d2008-02-08 04:18:43 -08002729 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002730}
2731
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07002732int lookup_module_symbol_name(unsigned long addr, char *symname)
2733{
2734 struct module *mod;
2735
Rusty Russellcb2a5202008-01-14 00:55:03 -08002736 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02002737 list_for_each_entry_rcu(mod, &modules, list) {
Masami Hiramatsua06f6212009-01-06 14:41:49 -08002738 if (within_module_init(addr, mod) ||
2739 within_module_core(addr, mod)) {
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07002740 const char *sym;
2741
2742 sym = get_ksymbol(mod, addr, NULL, NULL);
2743 if (!sym)
2744 goto out;
Tejun Heo9281ace2007-07-17 04:03:51 -07002745 strlcpy(symname, sym, KSYM_NAME_LEN);
Rusty Russellcb2a5202008-01-14 00:55:03 -08002746 preempt_enable();
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07002747 return 0;
2748 }
2749 }
2750out:
Rusty Russellcb2a5202008-01-14 00:55:03 -08002751 preempt_enable();
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07002752 return -ERANGE;
2753}
2754
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07002755int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
2756 unsigned long *offset, char *modname, char *name)
2757{
2758 struct module *mod;
2759
Rusty Russellcb2a5202008-01-14 00:55:03 -08002760 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02002761 list_for_each_entry_rcu(mod, &modules, list) {
Masami Hiramatsua06f6212009-01-06 14:41:49 -08002762 if (within_module_init(addr, mod) ||
2763 within_module_core(addr, mod)) {
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07002764 const char *sym;
2765
2766 sym = get_ksymbol(mod, addr, size, offset);
2767 if (!sym)
2768 goto out;
2769 if (modname)
Tejun Heo9281ace2007-07-17 04:03:51 -07002770 strlcpy(modname, mod->name, MODULE_NAME_LEN);
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07002771 if (name)
Tejun Heo9281ace2007-07-17 04:03:51 -07002772 strlcpy(name, sym, KSYM_NAME_LEN);
Rusty Russellcb2a5202008-01-14 00:55:03 -08002773 preempt_enable();
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07002774 return 0;
2775 }
2776 }
2777out:
Rusty Russellcb2a5202008-01-14 00:55:03 -08002778 preempt_enable();
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07002779 return -ERANGE;
2780}
2781
Alexey Dobriyanea078902007-05-08 00:28:39 -07002782int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
2783 char *name, char *module_name, int *exported)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002784{
2785 struct module *mod;
2786
Rusty Russellcb2a5202008-01-14 00:55:03 -08002787 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02002788 list_for_each_entry_rcu(mod, &modules, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002789 if (symnum < mod->num_symtab) {
2790 *value = mod->symtab[symnum].st_value;
2791 *type = mod->symtab[symnum].st_info;
Andreas Gruenbacher098c5ee2006-07-14 00:24:04 -07002792 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
Tejun Heo9281ace2007-07-17 04:03:51 -07002793 KSYM_NAME_LEN);
2794 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
Tim Abbottca4787b2009-01-05 08:40:10 -06002795 *exported = is_exported(name, *value, mod);
Rusty Russellcb2a5202008-01-14 00:55:03 -08002796 preempt_enable();
Alexey Dobriyanea078902007-05-08 00:28:39 -07002797 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002798 }
2799 symnum -= mod->num_symtab;
2800 }
Rusty Russellcb2a5202008-01-14 00:55:03 -08002801 preempt_enable();
Alexey Dobriyanea078902007-05-08 00:28:39 -07002802 return -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002803}
2804
2805static unsigned long mod_find_symname(struct module *mod, const char *name)
2806{
2807 unsigned int i;
2808
2809 for (i = 0; i < mod->num_symtab; i++)
Keith Owens54e8ce42006-02-03 03:03:53 -08002810 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2811 mod->symtab[i].st_info != 'U')
Linus Torvalds1da177e2005-04-16 15:20:36 -07002812 return mod->symtab[i].st_value;
2813 return 0;
2814}
2815
2816/* Look for this name: can be of form module:name. */
2817unsigned long module_kallsyms_lookup_name(const char *name)
2818{
2819 struct module *mod;
2820 char *colon;
2821 unsigned long ret = 0;
2822
2823 /* Don't lock: we're in enough trouble already. */
Rusty Russellcb2a5202008-01-14 00:55:03 -08002824 preempt_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002825 if ((colon = strchr(name, ':')) != NULL) {
2826 *colon = '\0';
2827 if ((mod = find_module(name)) != NULL)
2828 ret = mod_find_symname(mod, colon+1);
2829 *colon = ':';
2830 } else {
Andi Kleend72b3752008-08-30 10:09:00 +02002831 list_for_each_entry_rcu(mod, &modules, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002832 if ((ret = mod_find_symname(mod, name)) != 0)
2833 break;
2834 }
Rusty Russellcb2a5202008-01-14 00:55:03 -08002835 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002836 return ret;
2837}
Anders Kaseorg75a66612008-12-05 19:03:58 -05002838
2839int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
2840 struct module *, unsigned long),
2841 void *data)
2842{
2843 struct module *mod;
2844 unsigned int i;
2845 int ret;
2846
2847 list_for_each_entry(mod, &modules, list) {
2848 for (i = 0; i < mod->num_symtab; i++) {
2849 ret = fn(data, mod->strtab + mod->symtab[i].st_name,
2850 mod, mod->symtab[i].st_value);
2851 if (ret != 0)
2852 return ret;
2853 }
2854 }
2855 return 0;
2856}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002857#endif /* CONFIG_KALLSYMS */
2858
Arjan van de Ven21aa9282008-01-25 21:08:33 +01002859static char *module_flags(struct module *mod, char *buf)
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002860{
2861 int bx = 0;
2862
Arjan van de Ven21aa9282008-01-25 21:08:33 +01002863 if (mod->taints ||
2864 mod->state == MODULE_STATE_GOING ||
2865 mod->state == MODULE_STATE_COMING) {
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002866 buf[bx++] = '(';
Andi Kleen25ddbb12008-10-15 22:01:41 -07002867 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002868 buf[bx++] = 'P';
Andi Kleen25ddbb12008-10-15 22:01:41 -07002869 if (mod->taints & (1 << TAINT_FORCED_MODULE))
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002870 buf[bx++] = 'F';
Linus Torvalds26e9a392008-10-17 09:50:12 -07002871 if (mod->taints & (1 << TAINT_CRAP))
Greg Kroah-Hartman061b1bd2008-09-24 14:46:44 -07002872 buf[bx++] = 'C';
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002873 /*
2874 * TAINT_FORCED_RMMOD: could be added.
2875 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2876 * apply to modules.
2877 */
Arjan van de Ven21aa9282008-01-25 21:08:33 +01002878
2879 /* Show a - for module-is-being-unloaded */
2880 if (mod->state == MODULE_STATE_GOING)
2881 buf[bx++] = '-';
2882 /* Show a + for module-is-being-loaded */
2883 if (mod->state == MODULE_STATE_COMING)
2884 buf[bx++] = '+';
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002885 buf[bx++] = ')';
2886 }
2887 buf[bx] = '\0';
2888
2889 return buf;
2890}
2891
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +04002892#ifdef CONFIG_PROC_FS
2893/* Called by the /proc file system to return a list of modules. */
2894static void *m_start(struct seq_file *m, loff_t *pos)
2895{
2896 mutex_lock(&module_mutex);
2897 return seq_list_start(&modules, *pos);
2898}
2899
2900static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2901{
2902 return seq_list_next(p, &modules, pos);
2903}
2904
2905static void m_stop(struct seq_file *m, void *p)
2906{
2907 mutex_unlock(&module_mutex);
2908}
2909
Linus Torvalds1da177e2005-04-16 15:20:36 -07002910static int m_show(struct seq_file *m, void *p)
2911{
2912 struct module *mod = list_entry(p, struct module, list);
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002913 char buf[8];
2914
Denys Vlasenko2f0f2a32008-07-22 19:24:27 -05002915 seq_printf(m, "%s %u",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002916 mod->name, mod->init_size + mod->core_size);
2917 print_unload_info(m, mod);
2918
2919 /* Informative for users. */
2920 seq_printf(m, " %s",
2921 mod->state == MODULE_STATE_GOING ? "Unloading":
2922 mod->state == MODULE_STATE_COMING ? "Loading":
2923 "Live");
2924 /* Used by oprofile and other similar tools. */
2925 seq_printf(m, " 0x%p", mod->module_core);
2926
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002927 /* Taints info */
2928 if (mod->taints)
Arjan van de Ven21aa9282008-01-25 21:08:33 +01002929 seq_printf(m, " %s", module_flags(mod, buf));
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002930
Linus Torvalds1da177e2005-04-16 15:20:36 -07002931 seq_printf(m, "\n");
2932 return 0;
2933}
2934
2935/* Format: modulename size refcount deps address
2936
2937 Where refcount is a number or -, and deps is a comma-separated list
2938 of depends or -.
2939*/
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +04002940static const struct seq_operations modules_op = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002941 .start = m_start,
2942 .next = m_next,
2943 .stop = m_stop,
2944 .show = m_show
2945};
2946
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +04002947static int modules_open(struct inode *inode, struct file *file)
2948{
2949 return seq_open(file, &modules_op);
2950}
2951
2952static const struct file_operations proc_modules_operations = {
2953 .open = modules_open,
2954 .read = seq_read,
2955 .llseek = seq_lseek,
2956 .release = seq_release,
2957};
2958
2959static int __init proc_modules_init(void)
2960{
2961 proc_create("modules", 0, NULL, &proc_modules_operations);
2962 return 0;
2963}
2964module_init(proc_modules_init);
2965#endif
2966
Linus Torvalds1da177e2005-04-16 15:20:36 -07002967/* Given an address, look for it in the module exception tables. */
2968const struct exception_table_entry *search_module_extables(unsigned long addr)
2969{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002970 const struct exception_table_entry *e = NULL;
2971 struct module *mod;
2972
Rusty Russell24da1cb2007-07-15 23:41:46 -07002973 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02002974 list_for_each_entry_rcu(mod, &modules, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002975 if (mod->num_exentries == 0)
2976 continue;
Daniel Walker22a8bde2007-10-18 03:06:07 -07002977
Linus Torvalds1da177e2005-04-16 15:20:36 -07002978 e = search_extable(mod->extable,
2979 mod->extable + mod->num_exentries - 1,
2980 addr);
2981 if (e)
2982 break;
2983 }
Rusty Russell24da1cb2007-07-15 23:41:46 -07002984 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002985
2986 /* Now, if we found one, we are running inside it now, hence
Daniel Walker22a8bde2007-10-18 03:06:07 -07002987 we cannot unload the module, hence no refcnt needed. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002988 return e;
2989}
2990
Ingo Molnar4d435f92006-07-03 00:24:24 -07002991/*
Rusty Russelle6104992009-03-31 13:05:31 -06002992 * is_module_address - is this address inside a module?
2993 * @addr: the address to check.
2994 *
2995 * See is_module_text_address() if you simply want to see if the address
2996 * is code (not data).
Ingo Molnar4d435f92006-07-03 00:24:24 -07002997 */
Rusty Russelle6104992009-03-31 13:05:31 -06002998bool is_module_address(unsigned long addr)
Ingo Molnar4d435f92006-07-03 00:24:24 -07002999{
Rusty Russelle6104992009-03-31 13:05:31 -06003000 bool ret;
Ingo Molnar4d435f92006-07-03 00:24:24 -07003001
Rusty Russell24da1cb2007-07-15 23:41:46 -07003002 preempt_disable();
Rusty Russelle6104992009-03-31 13:05:31 -06003003 ret = __module_address(addr) != NULL;
Rusty Russell24da1cb2007-07-15 23:41:46 -07003004 preempt_enable();
Ingo Molnar4d435f92006-07-03 00:24:24 -07003005
Rusty Russelle6104992009-03-31 13:05:31 -06003006 return ret;
Ingo Molnar4d435f92006-07-03 00:24:24 -07003007}
3008
Rusty Russelle6104992009-03-31 13:05:31 -06003009/*
3010 * __module_address - get the module which contains an address.
3011 * @addr: the address.
3012 *
3013 * Must be called with preempt disabled or module mutex held so that
3014 * module doesn't get freed during this.
3015 */
Linus Torvalds714f83d2009-04-05 11:04:19 -07003016struct module *__module_address(unsigned long addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003017{
3018 struct module *mod;
3019
Rusty Russell3a642e92008-07-22 19:24:28 -05003020 if (addr < module_addr_min || addr > module_addr_max)
3021 return NULL;
3022
Andi Kleend72b3752008-08-30 10:09:00 +02003023 list_for_each_entry_rcu(mod, &modules, list)
Rusty Russelle6104992009-03-31 13:05:31 -06003024 if (within_module_core(addr, mod)
3025 || within_module_init(addr, mod))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003026 return mod;
3027 return NULL;
3028}
Tim Abbottc6b37802008-12-05 19:03:59 -05003029EXPORT_SYMBOL_GPL(__module_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003030
Rusty Russelle6104992009-03-31 13:05:31 -06003031/*
3032 * is_module_text_address - is this address inside module code?
3033 * @addr: the address to check.
3034 *
3035 * See is_module_address() if you simply want to see if the address is
3036 * anywhere in a module. See kernel_text_address() for testing if an
3037 * address corresponds to kernel or module code.
3038 */
3039bool is_module_text_address(unsigned long addr)
3040{
3041 bool ret;
3042
3043 preempt_disable();
3044 ret = __module_text_address(addr) != NULL;
3045 preempt_enable();
3046
3047 return ret;
3048}
3049
3050/*
3051 * __module_text_address - get the module whose code contains an address.
3052 * @addr: the address.
3053 *
3054 * Must be called with preempt disabled or module mutex held so that
3055 * module doesn't get freed during this.
3056 */
3057struct module *__module_text_address(unsigned long addr)
3058{
3059 struct module *mod = __module_address(addr);
3060 if (mod) {
3061 /* Make sure it's within the text section. */
3062 if (!within(addr, mod->module_init, mod->init_text_size)
3063 && !within(addr, mod->module_core, mod->core_text_size))
3064 mod = NULL;
3065 }
3066 return mod;
3067}
Tim Abbottc6b37802008-12-05 19:03:59 -05003068EXPORT_SYMBOL_GPL(__module_text_address);
Rusty Russelle6104992009-03-31 13:05:31 -06003069
Linus Torvalds1da177e2005-04-16 15:20:36 -07003070/* Don't grab lock, we're oopsing. */
3071void print_modules(void)
3072{
3073 struct module *mod;
Randy Dunlap2bc2d612006-10-02 02:17:02 -07003074 char buf[8];
Linus Torvalds1da177e2005-04-16 15:20:36 -07003075
Linus Torvaldsb2311252009-06-16 11:07:14 -07003076 printk(KERN_DEFAULT "Modules linked in:");
Andi Kleend72b3752008-08-30 10:09:00 +02003077 /* Most callers should already have preempt disabled, but make sure */
3078 preempt_disable();
3079 list_for_each_entry_rcu(mod, &modules, list)
Arjan van de Ven21aa9282008-01-25 21:08:33 +01003080 printk(" %s%s", mod->name, module_flags(mod, buf));
Andi Kleend72b3752008-08-30 10:09:00 +02003081 preempt_enable();
Arjan van de Vene14af7e2008-01-25 21:08:33 +01003082 if (last_unloaded_module[0])
3083 printk(" [last unloaded: %s]", last_unloaded_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003084 printk("\n");
3085}
3086
Linus Torvalds1da177e2005-04-16 15:20:36 -07003087#ifdef CONFIG_MODVERSIONS
Rusty Russell8c8ef422009-03-31 13:05:34 -06003088/* Generate the signature for all relevant module structures here.
3089 * If these change, we don't want to try to parse the module. */
3090void module_layout(struct module *mod,
3091 struct modversion_info *ver,
3092 struct kernel_param *kp,
3093 struct kernel_symbol *ks,
3094 struct marker *marker,
3095 struct tracepoint *tp)
3096{
3097}
3098EXPORT_SYMBOL(module_layout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003099#endif
Mathieu Desnoyers8256e472007-10-18 23:41:06 -07003100
Mathieu Desnoyers97e1c182008-07-18 12:16:16 -04003101#ifdef CONFIG_TRACEPOINTS
3102void module_update_tracepoints(void)
3103{
3104 struct module *mod;
3105
3106 mutex_lock(&module_mutex);
3107 list_for_each_entry(mod, &modules, list)
3108 if (!mod->taints)
3109 tracepoint_update_probe_range(mod->tracepoints,
3110 mod->tracepoints + mod->num_tracepoints);
3111 mutex_unlock(&module_mutex);
3112}
3113
3114/*
3115 * Returns 0 if current not found.
3116 * Returns 1 if current found.
3117 */
3118int module_get_iter_tracepoints(struct tracepoint_iter *iter)
3119{
3120 struct module *iter_mod;
3121 int found = 0;
3122
3123 mutex_lock(&module_mutex);
3124 list_for_each_entry(iter_mod, &modules, list) {
3125 if (!iter_mod->taints) {
3126 /*
3127 * Sorted module list
3128 */
3129 if (iter_mod < iter->module)
3130 continue;
3131 else if (iter_mod > iter->module)
3132 iter->tracepoint = NULL;
3133 found = tracepoint_get_iter_range(&iter->tracepoint,
3134 iter_mod->tracepoints,
3135 iter_mod->tracepoints
3136 + iter_mod->num_tracepoints);
3137 if (found) {
3138 iter->module = iter_mod;
3139 break;
3140 }
3141 }
3142 }
3143 mutex_unlock(&module_mutex);
3144 return found;
3145}
3146#endif