2 Copyright (C) 2002 Richard Henderson
3 Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
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.
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.
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
19 #include <linux/module.h>
20 #include <linux/moduleloader.h>
21 #include <linux/ftrace_event.h>
22 #include <linux/init.h>
23 #include <linux/kallsyms.h>
25 #include <linux/sysfs.h>
26 #include <linux/kernel.h>
27 #include <linux/slab.h>
28 #include <linux/vmalloc.h>
29 #include <linux/elf.h>
30 #include <linux/proc_fs.h>
31 #include <linux/seq_file.h>
32 #include <linux/syscalls.h>
33 #include <linux/fcntl.h>
34 #include <linux/rcupdate.h>
35 #include <linux/capability.h>
36 #include <linux/cpu.h>
37 #include <linux/moduleparam.h>
38 #include <linux/errno.h>
39 #include <linux/err.h>
40 #include <linux/vermagic.h>
41 #include <linux/notifier.h>
42 #include <linux/sched.h>
43 #include <linux/stop_machine.h>
44 #include <linux/device.h>
45 #include <linux/string.h>
46 #include <linux/mutex.h>
47 #include <linux/rculist.h>
48 #include <asm/uaccess.h>
49 #include <asm/cacheflush.h>
50 #include <linux/license.h>
51 #include <asm/sections.h>
52 #include <linux/tracepoint.h>
53 #include <linux/ftrace.h>
54 #include <linux/async.h>
55 #include <linux/percpu.h>
60 #define DEBUGP(fmt , a...)
63 #ifndef ARCH_SHF_SMALL
64 #define ARCH_SHF_SMALL 0
67 /* If this is set, the section belongs in the init part of the module */
68 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
70 /* List of modules, protected by module_mutex or preempt_disable
71 * (delete uses stop_machine/add uses RCU list operations). */
72 DEFINE_MUTEX(module_mutex);
73 EXPORT_SYMBOL_GPL(module_mutex);
74 static LIST_HEAD(modules);
76 /* Waiting for a module to finish initializing? */
77 static DECLARE_WAIT_QUEUE_HEAD(module_wq);
79 static BLOCKING_NOTIFIER_HEAD(module_notify_list);
81 /* Bounds of module allocation, for speeding __module_address */
82 static unsigned long module_addr_min = -1UL, module_addr_max = 0;
84 int register_module_notifier(struct notifier_block * nb)
86 return blocking_notifier_chain_register(&module_notify_list, nb);
88 EXPORT_SYMBOL(register_module_notifier);
90 int unregister_module_notifier(struct notifier_block * nb)
92 return blocking_notifier_chain_unregister(&module_notify_list, nb);
94 EXPORT_SYMBOL(unregister_module_notifier);
96 /* We require a truly strong try_module_get(): 0 means failure due to
97 ongoing or failed initialization etc. */
98 static inline int strong_try_module_get(struct module *mod)
100 if (mod && mod->state == MODULE_STATE_COMING)
102 if (try_module_get(mod))
108 static inline void add_taint_module(struct module *mod, unsigned flag)
111 mod->taints |= (1U << flag);
115 * A thread that wants to hold a reference to a module only while it
116 * is running can call this to safely exit. nfsd and lockd use this.
118 void __module_put_and_exit(struct module *mod, long code)
123 EXPORT_SYMBOL(__module_put_and_exit);
125 /* Find a module section: 0 means not found. */
126 static unsigned int find_sec(Elf_Ehdr *hdr,
128 const char *secstrings,
133 for (i = 1; i < hdr->e_shnum; i++)
134 /* Alloc bit cleared means "ignore it." */
135 if ((sechdrs[i].sh_flags & SHF_ALLOC)
136 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
141 /* Find a module section, or NULL. */
142 static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs,
143 const char *secstrings, const char *name)
145 /* Section 0 has sh_addr 0. */
146 return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr;
149 /* Find a module section, or NULL. Fill in number of "objects" in section. */
150 static void *section_objs(Elf_Ehdr *hdr,
152 const char *secstrings,
157 unsigned int sec = find_sec(hdr, sechdrs, secstrings, name);
159 /* Section 0 has sh_addr 0 and sh_size 0. */
160 *num = sechdrs[sec].sh_size / object_size;
161 return (void *)sechdrs[sec].sh_addr;
164 /* Provided by the linker */
165 extern const struct kernel_symbol __start___ksymtab[];
166 extern const struct kernel_symbol __stop___ksymtab[];
167 extern const struct kernel_symbol __start___ksymtab_gpl[];
168 extern const struct kernel_symbol __stop___ksymtab_gpl[];
169 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
170 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
171 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
172 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
173 extern const unsigned long __start___kcrctab[];
174 extern const unsigned long __start___kcrctab_gpl[];
175 extern const unsigned long __start___kcrctab_gpl_future[];
176 #ifdef CONFIG_UNUSED_SYMBOLS
177 extern const struct kernel_symbol __start___ksymtab_unused[];
178 extern const struct kernel_symbol __stop___ksymtab_unused[];
179 extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
180 extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
181 extern const unsigned long __start___kcrctab_unused[];
182 extern const unsigned long __start___kcrctab_unused_gpl[];
185 #ifndef CONFIG_MODVERSIONS
186 #define symversion(base, idx) NULL
188 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
191 static bool each_symbol_in_section(const struct symsearch *arr,
192 unsigned int arrsize,
193 struct module *owner,
194 bool (*fn)(const struct symsearch *syms,
195 struct module *owner,
196 unsigned int symnum, void *data),
201 for (j = 0; j < arrsize; j++) {
202 for (i = 0; i < arr[j].stop - arr[j].start; i++)
203 if (fn(&arr[j], owner, i, data))
210 /* Returns true as soon as fn returns true, otherwise false. */
211 bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner,
212 unsigned int symnum, void *data), void *data)
215 const struct symsearch arr[] = {
216 { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
217 NOT_GPL_ONLY, false },
218 { __start___ksymtab_gpl, __stop___ksymtab_gpl,
219 __start___kcrctab_gpl,
221 { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
222 __start___kcrctab_gpl_future,
223 WILL_BE_GPL_ONLY, false },
224 #ifdef CONFIG_UNUSED_SYMBOLS
225 { __start___ksymtab_unused, __stop___ksymtab_unused,
226 __start___kcrctab_unused,
227 NOT_GPL_ONLY, true },
228 { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
229 __start___kcrctab_unused_gpl,
234 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
237 list_for_each_entry_rcu(mod, &modules, list) {
238 struct symsearch arr[] = {
239 { mod->syms, mod->syms + mod->num_syms, mod->crcs,
240 NOT_GPL_ONLY, false },
241 { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
244 { mod->gpl_future_syms,
245 mod->gpl_future_syms + mod->num_gpl_future_syms,
246 mod->gpl_future_crcs,
247 WILL_BE_GPL_ONLY, false },
248 #ifdef CONFIG_UNUSED_SYMBOLS
250 mod->unused_syms + mod->num_unused_syms,
252 NOT_GPL_ONLY, true },
253 { mod->unused_gpl_syms,
254 mod->unused_gpl_syms + mod->num_unused_gpl_syms,
255 mod->unused_gpl_crcs,
260 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
265 EXPORT_SYMBOL_GPL(each_symbol);
267 struct find_symbol_arg {
274 struct module *owner;
275 const unsigned long *crc;
276 const struct kernel_symbol *sym;
279 static bool find_symbol_in_section(const struct symsearch *syms,
280 struct module *owner,
281 unsigned int symnum, void *data)
283 struct find_symbol_arg *fsa = data;
285 if (strcmp(syms->start[symnum].name, fsa->name) != 0)
289 if (syms->licence == GPL_ONLY)
291 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
292 printk(KERN_WARNING "Symbol %s is being used "
293 "by a non-GPL module, which will not "
294 "be allowed in the future\n", fsa->name);
295 printk(KERN_WARNING "Please see the file "
296 "Documentation/feature-removal-schedule.txt "
297 "in the kernel source tree for more details.\n");
301 #ifdef CONFIG_UNUSED_SYMBOLS
302 if (syms->unused && fsa->warn) {
303 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
304 "however this module is using it.\n", fsa->name);
306 "This symbol will go away in the future.\n");
308 "Please evalute if this is the right api to use and if "
309 "it really is, submit a report the linux kernel "
310 "mailinglist together with submitting your code for "
316 fsa->crc = symversion(syms->crcs, symnum);
317 fsa->sym = &syms->start[symnum];
321 /* Find a symbol and return it, along with, (optional) crc and
322 * (optional) module which owns it */
323 const struct kernel_symbol *find_symbol(const char *name,
324 struct module **owner,
325 const unsigned long **crc,
329 struct find_symbol_arg fsa;
335 if (each_symbol(find_symbol_in_section, &fsa)) {
343 DEBUGP("Failed to find symbol %s\n", name);
346 EXPORT_SYMBOL_GPL(find_symbol);
348 /* Search for module by name: must hold module_mutex. */
349 struct module *find_module(const char *name)
353 list_for_each_entry(mod, &modules, list) {
354 if (strcmp(mod->name, name) == 0)
359 EXPORT_SYMBOL_GPL(find_module);
363 #ifdef CONFIG_HAVE_DYNAMIC_PER_CPU_AREA
365 static void *percpu_modalloc(unsigned long size, unsigned long align,
370 if (align > PAGE_SIZE) {
371 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
372 name, align, PAGE_SIZE);
376 ptr = __alloc_reserved_percpu(size, align);
379 "Could not allocate %lu bytes percpu data\n", size);
383 static void percpu_modfree(void *freeme)
388 #else /* ... !CONFIG_HAVE_DYNAMIC_PER_CPU_AREA */
390 /* Number of blocks used and allocated. */
391 static unsigned int pcpu_num_used, pcpu_num_allocated;
392 /* Size of each block. -ve means used. */
393 static int *pcpu_size;
395 static int split_block(unsigned int i, unsigned short size)
397 /* Reallocation required? */
398 if (pcpu_num_used + 1 > pcpu_num_allocated) {
401 new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2,
406 pcpu_num_allocated *= 2;
410 /* Insert a new subblock */
411 memmove(&pcpu_size[i+1], &pcpu_size[i],
412 sizeof(pcpu_size[0]) * (pcpu_num_used - i));
415 pcpu_size[i+1] -= size;
420 static inline unsigned int block_size(int val)
427 static void *percpu_modalloc(unsigned long size, unsigned long align,
434 if (align > PAGE_SIZE) {
435 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
436 name, align, PAGE_SIZE);
440 ptr = __per_cpu_start;
441 for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
442 /* Extra for alignment requirement. */
443 extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr;
444 BUG_ON(i == 0 && extra != 0);
446 if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size)
449 /* Transfer extra to previous block. */
450 if (pcpu_size[i-1] < 0)
451 pcpu_size[i-1] -= extra;
453 pcpu_size[i-1] += extra;
454 pcpu_size[i] -= extra;
457 /* Split block if warranted */
458 if (pcpu_size[i] - size > sizeof(unsigned long))
459 if (!split_block(i, size))
463 pcpu_size[i] = -pcpu_size[i];
467 printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n",
472 static void percpu_modfree(void *freeme)
475 void *ptr = __per_cpu_start + block_size(pcpu_size[0]);
477 /* First entry is core kernel percpu data. */
478 for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
480 pcpu_size[i] = -pcpu_size[i];
487 /* Merge with previous? */
488 if (pcpu_size[i-1] >= 0) {
489 pcpu_size[i-1] += pcpu_size[i];
491 memmove(&pcpu_size[i], &pcpu_size[i+1],
492 (pcpu_num_used - i) * sizeof(pcpu_size[0]));
495 /* Merge with next? */
496 if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) {
497 pcpu_size[i] += pcpu_size[i+1];
499 memmove(&pcpu_size[i+1], &pcpu_size[i+2],
500 (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0]));
504 static int percpu_modinit(void)
507 pcpu_num_allocated = 2;
508 pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated,
510 /* Static in-kernel percpu data (used). */
511 pcpu_size[0] = -(__per_cpu_end-__per_cpu_start);
513 pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0];
514 if (pcpu_size[1] < 0) {
515 printk(KERN_ERR "No per-cpu room for modules.\n");
521 __initcall(percpu_modinit);
523 #endif /* CONFIG_HAVE_DYNAMIC_PER_CPU_AREA */
525 static unsigned int find_pcpusec(Elf_Ehdr *hdr,
527 const char *secstrings)
529 return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
532 static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size)
536 for_each_possible_cpu(cpu)
537 memcpy(pcpudest + per_cpu_offset(cpu), from, size);
540 #else /* ... !CONFIG_SMP */
542 static inline void *percpu_modalloc(unsigned long size, unsigned long align,
547 static inline void percpu_modfree(void *pcpuptr)
551 static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
553 const char *secstrings)
557 static inline void percpu_modcopy(void *pcpudst, const void *src,
560 /* pcpusec should be 0, and size of that section should be 0. */
564 #endif /* CONFIG_SMP */
566 #define MODINFO_ATTR(field) \
567 static void setup_modinfo_##field(struct module *mod, const char *s) \
569 mod->field = kstrdup(s, GFP_KERNEL); \
571 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
572 struct module *mod, char *buffer) \
574 return sprintf(buffer, "%s\n", mod->field); \
576 static int modinfo_##field##_exists(struct module *mod) \
578 return mod->field != NULL; \
580 static void free_modinfo_##field(struct module *mod) \
585 static struct module_attribute modinfo_##field = { \
586 .attr = { .name = __stringify(field), .mode = 0444 }, \
587 .show = show_modinfo_##field, \
588 .setup = setup_modinfo_##field, \
589 .test = modinfo_##field##_exists, \
590 .free = free_modinfo_##field, \
593 MODINFO_ATTR(version);
594 MODINFO_ATTR(srcversion);
596 static char last_unloaded_module[MODULE_NAME_LEN+1];
598 #ifdef CONFIG_MODULE_UNLOAD
599 /* Init the unload section of the module. */
600 static void module_unload_init(struct module *mod)
604 INIT_LIST_HEAD(&mod->modules_which_use_me);
605 for_each_possible_cpu(cpu)
606 local_set(__module_ref_addr(mod, cpu), 0);
607 /* Hold reference count during initialization. */
608 local_set(__module_ref_addr(mod, raw_smp_processor_id()), 1);
609 /* Backwards compatibility macros put refcount during init. */
610 mod->waiter = current;
613 /* modules using other modules */
616 struct list_head list;
617 struct module *module_which_uses;
620 /* Does a already use b? */
621 static int already_uses(struct module *a, struct module *b)
623 struct module_use *use;
625 list_for_each_entry(use, &b->modules_which_use_me, list) {
626 if (use->module_which_uses == a) {
627 DEBUGP("%s uses %s!\n", a->name, b->name);
631 DEBUGP("%s does not use %s!\n", a->name, b->name);
635 /* Module a uses b */
636 int use_module(struct module *a, struct module *b)
638 struct module_use *use;
641 if (b == NULL || already_uses(a, b)) return 1;
643 /* If we're interrupted or time out, we fail. */
644 if (wait_event_interruptible_timeout(
645 module_wq, (err = strong_try_module_get(b)) != -EBUSY,
647 printk("%s: gave up waiting for init of module %s.\n",
652 /* If strong_try_module_get() returned a different error, we fail. */
656 DEBUGP("Allocating new usage for %s.\n", a->name);
657 use = kmalloc(sizeof(*use), GFP_ATOMIC);
659 printk("%s: out of memory loading\n", a->name);
664 use->module_which_uses = a;
665 list_add(&use->list, &b->modules_which_use_me);
666 no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
669 EXPORT_SYMBOL_GPL(use_module);
671 /* Clear the unload stuff of the module. */
672 static void module_unload_free(struct module *mod)
676 list_for_each_entry(i, &modules, list) {
677 struct module_use *use;
679 list_for_each_entry(use, &i->modules_which_use_me, list) {
680 if (use->module_which_uses == mod) {
681 DEBUGP("%s unusing %s\n", mod->name, i->name);
683 list_del(&use->list);
685 sysfs_remove_link(i->holders_dir, mod->name);
686 /* There can be at most one match. */
693 #ifdef CONFIG_MODULE_FORCE_UNLOAD
694 static inline int try_force_unload(unsigned int flags)
696 int ret = (flags & O_TRUNC);
698 add_taint(TAINT_FORCED_RMMOD);
702 static inline int try_force_unload(unsigned int flags)
706 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
715 /* Whole machine is stopped with interrupts off when this runs. */
716 static int __try_stop_module(void *_sref)
718 struct stopref *sref = _sref;
720 /* If it's not unused, quit unless we're forcing. */
721 if (module_refcount(sref->mod) != 0) {
722 if (!(*sref->forced = try_force_unload(sref->flags)))
726 /* Mark it as dying. */
727 sref->mod->state = MODULE_STATE_GOING;
731 static int try_stop_module(struct module *mod, int flags, int *forced)
733 if (flags & O_NONBLOCK) {
734 struct stopref sref = { mod, flags, forced };
736 return stop_machine(__try_stop_module, &sref, NULL);
738 /* We don't need to stop the machine for this. */
739 mod->state = MODULE_STATE_GOING;
745 unsigned int module_refcount(struct module *mod)
747 unsigned int total = 0;
750 for_each_possible_cpu(cpu)
751 total += local_read(__module_ref_addr(mod, cpu));
754 EXPORT_SYMBOL(module_refcount);
756 /* This exists whether we can unload or not */
757 static void free_module(struct module *mod);
759 static void wait_for_zero_refcount(struct module *mod)
761 /* Since we might sleep for some time, release the mutex first */
762 mutex_unlock(&module_mutex);
764 DEBUGP("Looking at refcount...\n");
765 set_current_state(TASK_UNINTERRUPTIBLE);
766 if (module_refcount(mod) == 0)
770 current->state = TASK_RUNNING;
771 mutex_lock(&module_mutex);
774 SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
778 char name[MODULE_NAME_LEN];
781 if (!capable(CAP_SYS_MODULE))
784 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
786 name[MODULE_NAME_LEN-1] = '\0';
788 /* Create stop_machine threads since free_module relies on
789 * a non-failing stop_machine call. */
790 ret = stop_machine_create();
794 if (mutex_lock_interruptible(&module_mutex) != 0) {
799 mod = find_module(name);
805 if (!list_empty(&mod->modules_which_use_me)) {
806 /* Other modules depend on us: get rid of them first. */
811 /* Doing init or already dying? */
812 if (mod->state != MODULE_STATE_LIVE) {
813 /* FIXME: if (force), slam module count and wake up
815 DEBUGP("%s already dying\n", mod->name);
820 /* If it has an init func, it must have an exit func to unload */
821 if (mod->init && !mod->exit) {
822 forced = try_force_unload(flags);
824 /* This module can't be removed */
830 /* Set this up before setting mod->state */
831 mod->waiter = current;
833 /* Stop the machine so refcounts can't move and disable module. */
834 ret = try_stop_module(mod, flags, &forced);
838 /* Never wait if forced. */
839 if (!forced && module_refcount(mod) != 0)
840 wait_for_zero_refcount(mod);
842 mutex_unlock(&module_mutex);
843 /* Final destruction now noone is using it. */
844 if (mod->exit != NULL)
846 blocking_notifier_call_chain(&module_notify_list,
847 MODULE_STATE_GOING, mod);
848 async_synchronize_full();
849 mutex_lock(&module_mutex);
850 /* Store the name of the last unloaded module for diagnostic purposes */
851 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
852 ddebug_remove_module(mod->name);
856 mutex_unlock(&module_mutex);
858 stop_machine_destroy();
862 static inline void print_unload_info(struct seq_file *m, struct module *mod)
864 struct module_use *use;
865 int printed_something = 0;
867 seq_printf(m, " %u ", module_refcount(mod));
869 /* Always include a trailing , so userspace can differentiate
870 between this and the old multi-field proc format. */
871 list_for_each_entry(use, &mod->modules_which_use_me, list) {
872 printed_something = 1;
873 seq_printf(m, "%s,", use->module_which_uses->name);
876 if (mod->init != NULL && mod->exit == NULL) {
877 printed_something = 1;
878 seq_printf(m, "[permanent],");
881 if (!printed_something)
885 void __symbol_put(const char *symbol)
887 struct module *owner;
890 if (!find_symbol(symbol, &owner, NULL, true, false))
895 EXPORT_SYMBOL(__symbol_put);
897 void symbol_put_addr(void *addr)
899 struct module *modaddr;
901 if (core_kernel_text((unsigned long)addr))
904 /* module_text_address is safe here: we're supposed to have reference
905 * to module from symbol_get, so it can't go away. */
906 modaddr = __module_text_address((unsigned long)addr);
910 EXPORT_SYMBOL_GPL(symbol_put_addr);
912 static ssize_t show_refcnt(struct module_attribute *mattr,
913 struct module *mod, char *buffer)
915 return sprintf(buffer, "%u\n", module_refcount(mod));
918 static struct module_attribute refcnt = {
919 .attr = { .name = "refcnt", .mode = 0444 },
923 void module_put(struct module *module)
926 unsigned int cpu = get_cpu();
927 local_dec(__module_ref_addr(module, cpu));
928 /* Maybe they're waiting for us to drop reference? */
929 if (unlikely(!module_is_live(module)))
930 wake_up_process(module->waiter);
934 EXPORT_SYMBOL(module_put);
936 #else /* !CONFIG_MODULE_UNLOAD */
937 static inline void print_unload_info(struct seq_file *m, struct module *mod)
939 /* We don't know the usage count, or what modules are using. */
940 seq_printf(m, " - -");
943 static inline void module_unload_free(struct module *mod)
947 int use_module(struct module *a, struct module *b)
949 return strong_try_module_get(b) == 0;
951 EXPORT_SYMBOL_GPL(use_module);
953 static inline void module_unload_init(struct module *mod)
956 #endif /* CONFIG_MODULE_UNLOAD */
958 static ssize_t show_initstate(struct module_attribute *mattr,
959 struct module *mod, char *buffer)
961 const char *state = "unknown";
963 switch (mod->state) {
964 case MODULE_STATE_LIVE:
967 case MODULE_STATE_COMING:
970 case MODULE_STATE_GOING:
974 return sprintf(buffer, "%s\n", state);
977 static struct module_attribute initstate = {
978 .attr = { .name = "initstate", .mode = 0444 },
979 .show = show_initstate,
982 static struct module_attribute *modinfo_attrs[] = {
986 #ifdef CONFIG_MODULE_UNLOAD
992 static const char vermagic[] = VERMAGIC_STRING;
994 static int try_to_force_load(struct module *mod, const char *reason)
996 #ifdef CONFIG_MODULE_FORCE_LOAD
997 if (!test_taint(TAINT_FORCED_MODULE))
998 printk(KERN_WARNING "%s: %s: kernel tainted.\n",
1000 add_taint_module(mod, TAINT_FORCED_MODULE);
1007 #ifdef CONFIG_MODVERSIONS
1008 static int check_version(Elf_Shdr *sechdrs,
1009 unsigned int versindex,
1010 const char *symname,
1012 const unsigned long *crc)
1014 unsigned int i, num_versions;
1015 struct modversion_info *versions;
1017 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1021 /* No versions at all? modprobe --force does this. */
1023 return try_to_force_load(mod, symname) == 0;
1025 versions = (void *) sechdrs[versindex].sh_addr;
1026 num_versions = sechdrs[versindex].sh_size
1027 / sizeof(struct modversion_info);
1029 for (i = 0; i < num_versions; i++) {
1030 if (strcmp(versions[i].name, symname) != 0)
1033 if (versions[i].crc == *crc)
1035 DEBUGP("Found checksum %lX vs module %lX\n",
1036 *crc, versions[i].crc);
1040 printk(KERN_WARNING "%s: no symbol version for %s\n",
1041 mod->name, symname);
1045 printk("%s: disagrees about version of symbol %s\n",
1046 mod->name, symname);
1050 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1051 unsigned int versindex,
1054 const unsigned long *crc;
1056 if (!find_symbol("module_layout", NULL, &crc, true, false))
1058 return check_version(sechdrs, versindex, "module_layout", mod, crc);
1061 /* First part is kernel version, which we ignore if module has crcs. */
1062 static inline int same_magic(const char *amagic, const char *bmagic,
1066 amagic += strcspn(amagic, " ");
1067 bmagic += strcspn(bmagic, " ");
1069 return strcmp(amagic, bmagic) == 0;
1072 static inline int check_version(Elf_Shdr *sechdrs,
1073 unsigned int versindex,
1074 const char *symname,
1076 const unsigned long *crc)
1081 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1082 unsigned int versindex,
1088 static inline int same_magic(const char *amagic, const char *bmagic,
1091 return strcmp(amagic, bmagic) == 0;
1093 #endif /* CONFIG_MODVERSIONS */
1095 /* Resolve a symbol for this module. I.e. if we find one, record usage.
1096 Must be holding module_mutex. */
1097 static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
1098 unsigned int versindex,
1102 struct module *owner;
1103 const struct kernel_symbol *sym;
1104 const unsigned long *crc;
1106 sym = find_symbol(name, &owner, &crc,
1107 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
1108 /* use_module can fail due to OOM,
1109 or module initialization or unloading */
1111 if (!check_version(sechdrs, versindex, name, mod, crc) ||
1112 !use_module(mod, owner))
1119 * /sys/module/foo/sections stuff
1120 * J. Corbet <corbet@lwn.net>
1122 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1123 struct module_sect_attr
1125 struct module_attribute mattr;
1127 unsigned long address;
1130 struct module_sect_attrs
1132 struct attribute_group grp;
1133 unsigned int nsections;
1134 struct module_sect_attr attrs[0];
1137 static ssize_t module_sect_show(struct module_attribute *mattr,
1138 struct module *mod, char *buf)
1140 struct module_sect_attr *sattr =
1141 container_of(mattr, struct module_sect_attr, mattr);
1142 return sprintf(buf, "0x%lx\n", sattr->address);
1145 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1147 unsigned int section;
1149 for (section = 0; section < sect_attrs->nsections; section++)
1150 kfree(sect_attrs->attrs[section].name);
1154 static void add_sect_attrs(struct module *mod, unsigned int nsect,
1155 char *secstrings, Elf_Shdr *sechdrs)
1157 unsigned int nloaded = 0, i, size[2];
1158 struct module_sect_attrs *sect_attrs;
1159 struct module_sect_attr *sattr;
1160 struct attribute **gattr;
1162 /* Count loaded sections and allocate structures */
1163 for (i = 0; i < nsect; i++)
1164 if (sechdrs[i].sh_flags & SHF_ALLOC)
1166 size[0] = ALIGN(sizeof(*sect_attrs)
1167 + nloaded * sizeof(sect_attrs->attrs[0]),
1168 sizeof(sect_attrs->grp.attrs[0]));
1169 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1170 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1171 if (sect_attrs == NULL)
1174 /* Setup section attributes. */
1175 sect_attrs->grp.name = "sections";
1176 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1178 sect_attrs->nsections = 0;
1179 sattr = §_attrs->attrs[0];
1180 gattr = §_attrs->grp.attrs[0];
1181 for (i = 0; i < nsect; i++) {
1182 if (! (sechdrs[i].sh_flags & SHF_ALLOC))
1184 sattr->address = sechdrs[i].sh_addr;
1185 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1187 if (sattr->name == NULL)
1189 sect_attrs->nsections++;
1190 sattr->mattr.show = module_sect_show;
1191 sattr->mattr.store = NULL;
1192 sattr->mattr.attr.name = sattr->name;
1193 sattr->mattr.attr.mode = S_IRUGO;
1194 *(gattr++) = &(sattr++)->mattr.attr;
1198 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
1201 mod->sect_attrs = sect_attrs;
1204 free_sect_attrs(sect_attrs);
1207 static void remove_sect_attrs(struct module *mod)
1209 if (mod->sect_attrs) {
1210 sysfs_remove_group(&mod->mkobj.kobj,
1211 &mod->sect_attrs->grp);
1212 /* We are positive that no one is using any sect attrs
1213 * at this point. Deallocate immediately. */
1214 free_sect_attrs(mod->sect_attrs);
1215 mod->sect_attrs = NULL;
1220 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1223 struct module_notes_attrs {
1224 struct kobject *dir;
1226 struct bin_attribute attrs[0];
1229 static ssize_t module_notes_read(struct kobject *kobj,
1230 struct bin_attribute *bin_attr,
1231 char *buf, loff_t pos, size_t count)
1234 * The caller checked the pos and count against our size.
1236 memcpy(buf, bin_attr->private + pos, count);
1240 static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1243 if (notes_attrs->dir) {
1245 sysfs_remove_bin_file(notes_attrs->dir,
1246 ¬es_attrs->attrs[i]);
1247 kobject_put(notes_attrs->dir);
1252 static void add_notes_attrs(struct module *mod, unsigned int nsect,
1253 char *secstrings, Elf_Shdr *sechdrs)
1255 unsigned int notes, loaded, i;
1256 struct module_notes_attrs *notes_attrs;
1257 struct bin_attribute *nattr;
1259 /* Count notes sections and allocate structures. */
1261 for (i = 0; i < nsect; i++)
1262 if ((sechdrs[i].sh_flags & SHF_ALLOC) &&
1263 (sechdrs[i].sh_type == SHT_NOTE))
1269 notes_attrs = kzalloc(sizeof(*notes_attrs)
1270 + notes * sizeof(notes_attrs->attrs[0]),
1272 if (notes_attrs == NULL)
1275 notes_attrs->notes = notes;
1276 nattr = ¬es_attrs->attrs[0];
1277 for (loaded = i = 0; i < nsect; ++i) {
1278 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1280 if (sechdrs[i].sh_type == SHT_NOTE) {
1281 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1282 nattr->attr.mode = S_IRUGO;
1283 nattr->size = sechdrs[i].sh_size;
1284 nattr->private = (void *) sechdrs[i].sh_addr;
1285 nattr->read = module_notes_read;
1291 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1292 if (!notes_attrs->dir)
1295 for (i = 0; i < notes; ++i)
1296 if (sysfs_create_bin_file(notes_attrs->dir,
1297 ¬es_attrs->attrs[i]))
1300 mod->notes_attrs = notes_attrs;
1304 free_notes_attrs(notes_attrs, i);
1307 static void remove_notes_attrs(struct module *mod)
1309 if (mod->notes_attrs)
1310 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1315 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1316 char *sectstrings, Elf_Shdr *sechdrs)
1320 static inline void remove_sect_attrs(struct module *mod)
1324 static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
1325 char *sectstrings, Elf_Shdr *sechdrs)
1329 static inline void remove_notes_attrs(struct module *mod)
1335 int module_add_modinfo_attrs(struct module *mod)
1337 struct module_attribute *attr;
1338 struct module_attribute *temp_attr;
1342 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1343 (ARRAY_SIZE(modinfo_attrs) + 1)),
1345 if (!mod->modinfo_attrs)
1348 temp_attr = mod->modinfo_attrs;
1349 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1351 (attr->test && attr->test(mod))) {
1352 memcpy(temp_attr, attr, sizeof(*temp_attr));
1353 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1360 void module_remove_modinfo_attrs(struct module *mod)
1362 struct module_attribute *attr;
1365 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1366 /* pick a field to test for end of list */
1367 if (!attr->attr.name)
1369 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1373 kfree(mod->modinfo_attrs);
1376 int mod_sysfs_init(struct module *mod)
1379 struct kobject *kobj;
1381 if (!module_sysfs_initialized) {
1382 printk(KERN_ERR "%s: module sysfs not initialized\n",
1388 kobj = kset_find_obj(module_kset, mod->name);
1390 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1396 mod->mkobj.mod = mod;
1398 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1399 mod->mkobj.kobj.kset = module_kset;
1400 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1403 kobject_put(&mod->mkobj.kobj);
1405 /* delay uevent until full sysfs population */
1410 int mod_sysfs_setup(struct module *mod,
1411 struct kernel_param *kparam,
1412 unsigned int num_params)
1416 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1417 if (!mod->holders_dir) {
1422 err = module_param_sysfs_setup(mod, kparam, num_params);
1424 goto out_unreg_holders;
1426 err = module_add_modinfo_attrs(mod);
1428 goto out_unreg_param;
1430 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1434 module_param_sysfs_remove(mod);
1436 kobject_put(mod->holders_dir);
1438 kobject_put(&mod->mkobj.kobj);
1442 static void mod_sysfs_fini(struct module *mod)
1444 kobject_put(&mod->mkobj.kobj);
1447 #else /* CONFIG_SYSFS */
1449 static void mod_sysfs_fini(struct module *mod)
1453 #endif /* CONFIG_SYSFS */
1455 static void mod_kobject_remove(struct module *mod)
1457 module_remove_modinfo_attrs(mod);
1458 module_param_sysfs_remove(mod);
1459 kobject_put(mod->mkobj.drivers_dir);
1460 kobject_put(mod->holders_dir);
1461 mod_sysfs_fini(mod);
1465 * unlink the module with the whole machine is stopped with interrupts off
1466 * - this defends against kallsyms not taking locks
1468 static int __unlink_module(void *_mod)
1470 struct module *mod = _mod;
1471 list_del(&mod->list);
1475 /* Free a module, remove from lists, etc (must hold module_mutex). */
1476 static void free_module(struct module *mod)
1478 /* Delete from various lists */
1479 stop_machine(__unlink_module, mod, NULL);
1480 remove_notes_attrs(mod);
1481 remove_sect_attrs(mod);
1482 mod_kobject_remove(mod);
1484 /* Arch-specific cleanup. */
1485 module_arch_cleanup(mod);
1487 /* Module unload stuff */
1488 module_unload_free(mod);
1490 /* Free any allocated parameters. */
1491 destroy_params(mod->kp, mod->num_kp);
1493 /* release any pointers to mcount in this module */
1494 ftrace_release(mod->module_core, mod->core_size);
1496 /* This may be NULL, but that's OK */
1497 module_free(mod, mod->module_init);
1500 percpu_modfree(mod->percpu);
1501 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
1503 percpu_modfree(mod->refptr);
1505 /* Free lock-classes: */
1506 lockdep_free_key_range(mod->module_core, mod->core_size);
1508 /* Finally, free the core (containing the module structure) */
1509 module_free(mod, mod->module_core);
1512 void *__symbol_get(const char *symbol)
1514 struct module *owner;
1515 const struct kernel_symbol *sym;
1518 sym = find_symbol(symbol, &owner, NULL, true, true);
1519 if (sym && strong_try_module_get(owner))
1523 return sym ? (void *)sym->value : NULL;
1525 EXPORT_SYMBOL_GPL(__symbol_get);
1528 * Ensure that an exported symbol [global namespace] does not already exist
1529 * in the kernel or in some other module's exported symbol table.
1531 static int verify_export_symbols(struct module *mod)
1534 struct module *owner;
1535 const struct kernel_symbol *s;
1537 const struct kernel_symbol *sym;
1540 { mod->syms, mod->num_syms },
1541 { mod->gpl_syms, mod->num_gpl_syms },
1542 { mod->gpl_future_syms, mod->num_gpl_future_syms },
1543 #ifdef CONFIG_UNUSED_SYMBOLS
1544 { mod->unused_syms, mod->num_unused_syms },
1545 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
1549 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1550 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1551 if (find_symbol(s->name, &owner, NULL, true, false)) {
1553 "%s: exports duplicate symbol %s"
1555 mod->name, s->name, module_name(owner));
1563 /* Change all symbols so that st_value encodes the pointer directly. */
1564 static int simplify_symbols(Elf_Shdr *sechdrs,
1565 unsigned int symindex,
1567 unsigned int versindex,
1568 unsigned int pcpuindex,
1571 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1572 unsigned long secbase;
1573 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1575 const struct kernel_symbol *ksym;
1577 for (i = 1; i < n; i++) {
1578 switch (sym[i].st_shndx) {
1580 /* We compiled with -fno-common. These are not
1581 supposed to happen. */
1582 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1583 printk("%s: please compile with -fno-common\n",
1589 /* Don't need to do anything */
1590 DEBUGP("Absolute symbol: 0x%08lx\n",
1591 (long)sym[i].st_value);
1595 ksym = resolve_symbol(sechdrs, versindex,
1596 strtab + sym[i].st_name, mod);
1597 /* Ok if resolved. */
1599 sym[i].st_value = ksym->value;
1604 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1607 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1608 mod->name, strtab + sym[i].st_name);
1613 /* Divert to percpu allocation if a percpu var. */
1614 if (sym[i].st_shndx == pcpuindex)
1615 secbase = (unsigned long)mod->percpu;
1617 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1618 sym[i].st_value += secbase;
1626 /* Additional bytes needed by arch in front of individual sections */
1627 unsigned int __weak arch_mod_section_prepend(struct module *mod,
1628 unsigned int section)
1630 /* default implementation just returns zero */
1634 /* Update size with this section: return offset. */
1635 static long get_offset(struct module *mod, unsigned int *size,
1636 Elf_Shdr *sechdr, unsigned int section)
1640 *size += arch_mod_section_prepend(mod, section);
1641 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1642 *size = ret + sechdr->sh_size;
1646 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1647 might -- code, read-only data, read-write data, small data. Tally
1648 sizes, and place the offsets into sh_entsize fields: high bit means it
1650 static void layout_sections(struct module *mod,
1651 const Elf_Ehdr *hdr,
1653 const char *secstrings)
1655 static unsigned long const masks[][2] = {
1656 /* NOTE: all executable code must be the first section
1657 * in this array; otherwise modify the text_size
1658 * finder in the two loops below */
1659 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1660 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1661 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1662 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1666 for (i = 0; i < hdr->e_shnum; i++)
1667 sechdrs[i].sh_entsize = ~0UL;
1669 DEBUGP("Core section allocation order:\n");
1670 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1671 for (i = 0; i < hdr->e_shnum; ++i) {
1672 Elf_Shdr *s = &sechdrs[i];
1674 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1675 || (s->sh_flags & masks[m][1])
1676 || s->sh_entsize != ~0UL
1677 || strstarts(secstrings + s->sh_name, ".init"))
1679 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
1680 DEBUGP("\t%s\n", secstrings + s->sh_name);
1683 mod->core_text_size = mod->core_size;
1686 DEBUGP("Init section allocation order:\n");
1687 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1688 for (i = 0; i < hdr->e_shnum; ++i) {
1689 Elf_Shdr *s = &sechdrs[i];
1691 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1692 || (s->sh_flags & masks[m][1])
1693 || s->sh_entsize != ~0UL
1694 || !strstarts(secstrings + s->sh_name, ".init"))
1696 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
1697 | INIT_OFFSET_MASK);
1698 DEBUGP("\t%s\n", secstrings + s->sh_name);
1701 mod->init_text_size = mod->init_size;
1705 static void set_license(struct module *mod, const char *license)
1708 license = "unspecified";
1710 if (!license_is_gpl_compatible(license)) {
1711 if (!test_taint(TAINT_PROPRIETARY_MODULE))
1712 printk(KERN_WARNING "%s: module license '%s' taints "
1713 "kernel.\n", mod->name, license);
1714 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1718 /* Parse tag=value strings from .modinfo section */
1719 static char *next_string(char *string, unsigned long *secsize)
1721 /* Skip non-zero chars */
1724 if ((*secsize)-- <= 1)
1728 /* Skip any zero padding. */
1729 while (!string[0]) {
1731 if ((*secsize)-- <= 1)
1737 static char *get_modinfo(Elf_Shdr *sechdrs,
1742 unsigned int taglen = strlen(tag);
1743 unsigned long size = sechdrs[info].sh_size;
1745 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1746 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1747 return p + taglen + 1;
1752 static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1753 unsigned int infoindex)
1755 struct module_attribute *attr;
1758 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1761 get_modinfo(sechdrs,
1767 #ifdef CONFIG_KALLSYMS
1769 /* lookup symbol in given range of kernel_symbols */
1770 static const struct kernel_symbol *lookup_symbol(const char *name,
1771 const struct kernel_symbol *start,
1772 const struct kernel_symbol *stop)
1774 const struct kernel_symbol *ks = start;
1775 for (; ks < stop; ks++)
1776 if (strcmp(ks->name, name) == 0)
1781 static int is_exported(const char *name, unsigned long value,
1782 const struct module *mod)
1784 const struct kernel_symbol *ks;
1786 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
1788 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
1789 return ks != NULL && ks->value == value;
1793 static char elf_type(const Elf_Sym *sym,
1795 const char *secstrings,
1798 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1799 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1804 if (sym->st_shndx == SHN_UNDEF)
1806 if (sym->st_shndx == SHN_ABS)
1808 if (sym->st_shndx >= SHN_LORESERVE)
1810 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1812 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1813 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1814 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1816 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1821 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1822 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1827 if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug"))
1832 static void add_kallsyms(struct module *mod,
1834 unsigned int symindex,
1835 unsigned int strindex,
1836 const char *secstrings)
1840 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1841 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1842 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1844 /* Set types up while we still have access to sections. */
1845 for (i = 0; i < mod->num_symtab; i++)
1846 mod->symtab[i].st_info
1847 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1850 static inline void add_kallsyms(struct module *mod,
1852 unsigned int symindex,
1853 unsigned int strindex,
1854 const char *secstrings)
1857 #endif /* CONFIG_KALLSYMS */
1859 static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
1861 #ifdef CONFIG_DYNAMIC_DEBUG
1862 if (ddebug_add_module(debug, num, debug->modname))
1863 printk(KERN_ERR "dynamic debug error adding module: %s\n",
1868 static void *module_alloc_update_bounds(unsigned long size)
1870 void *ret = module_alloc(size);
1873 /* Update module bounds. */
1874 if ((unsigned long)ret < module_addr_min)
1875 module_addr_min = (unsigned long)ret;
1876 if ((unsigned long)ret + size > module_addr_max)
1877 module_addr_max = (unsigned long)ret + size;
1882 /* Allocate and load the module: note that size of section 0 is always
1883 zero, and we rely on this for optional sections. */
1884 static noinline struct module *load_module(void __user *umod,
1886 const char __user *uargs)
1890 char *secstrings, *args, *modmagic, *strtab = NULL;
1893 unsigned int symindex = 0;
1894 unsigned int strindex = 0;
1895 unsigned int modindex, versindex, infoindex, pcpuindex;
1896 unsigned int num_mcount;
1899 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1900 unsigned long *mseg;
1901 mm_segment_t old_fs;
1903 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1905 if (len < sizeof(*hdr))
1906 return ERR_PTR(-ENOEXEC);
1908 /* Suck in entire file: we'll want most of it. */
1909 /* vmalloc barfs on "unusual" numbers. Check here */
1910 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1911 return ERR_PTR(-ENOMEM);
1913 if (copy_from_user(hdr, umod, len) != 0) {
1918 /* Sanity checks against insmoding binaries or wrong arch,
1919 weird elf version */
1920 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
1921 || hdr->e_type != ET_REL
1922 || !elf_check_arch(hdr)
1923 || hdr->e_shentsize != sizeof(*sechdrs)) {
1928 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
1931 /* Convenience variables */
1932 sechdrs = (void *)hdr + hdr->e_shoff;
1933 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
1934 sechdrs[0].sh_addr = 0;
1936 for (i = 1; i < hdr->e_shnum; i++) {
1937 if (sechdrs[i].sh_type != SHT_NOBITS
1938 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
1941 /* Mark all sections sh_addr with their address in the
1943 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
1945 /* Internal symbols and strings. */
1946 if (sechdrs[i].sh_type == SHT_SYMTAB) {
1948 strindex = sechdrs[i].sh_link;
1949 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
1951 #ifndef CONFIG_MODULE_UNLOAD
1952 /* Don't load .exit sections */
1953 if (strstarts(secstrings+sechdrs[i].sh_name, ".exit"))
1954 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
1958 modindex = find_sec(hdr, sechdrs, secstrings,
1959 ".gnu.linkonce.this_module");
1961 printk(KERN_WARNING "No module found in object\n");
1965 /* This is temporary: point mod into copy of data. */
1966 mod = (void *)sechdrs[modindex].sh_addr;
1968 if (symindex == 0) {
1969 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
1975 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
1976 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
1977 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
1979 /* Don't keep modinfo and version sections. */
1980 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1981 sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1982 #ifdef CONFIG_KALLSYMS
1983 /* Keep symbol and string tables for decoding later. */
1984 sechdrs[symindex].sh_flags |= SHF_ALLOC;
1985 sechdrs[strindex].sh_flags |= SHF_ALLOC;
1988 /* Check module struct version now, before we try to use module. */
1989 if (!check_modstruct_version(sechdrs, versindex, mod)) {
1994 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
1995 /* This is allowed: modprobe --force will invalidate it. */
1997 err = try_to_force_load(mod, "bad vermagic");
2000 } else if (!same_magic(modmagic, vermagic, versindex)) {
2001 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
2002 mod->name, modmagic, vermagic);
2007 staging = get_modinfo(sechdrs, infoindex, "staging");
2009 add_taint_module(mod, TAINT_CRAP);
2010 printk(KERN_WARNING "%s: module is from the staging directory,"
2011 " the quality is unknown, you have been warned.\n",
2015 /* Now copy in args */
2016 args = strndup_user(uargs, ~0UL >> 1);
2018 err = PTR_ERR(args);
2022 if (find_module(mod->name)) {
2027 mod->state = MODULE_STATE_COMING;
2029 /* Allow arches to frob section contents and sizes. */
2030 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
2035 /* We have a special allocation for this section. */
2036 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
2037 sechdrs[pcpuindex].sh_addralign,
2043 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2044 mod->percpu = percpu;
2047 /* Determine total sizes, and put offsets in sh_entsize. For now
2048 this is done generically; there doesn't appear to be any
2049 special cases for the architectures. */
2050 layout_sections(mod, hdr, sechdrs, secstrings);
2052 /* Do the allocs. */
2053 ptr = module_alloc_update_bounds(mod->core_size);
2058 memset(ptr, 0, mod->core_size);
2059 mod->module_core = ptr;
2061 ptr = module_alloc_update_bounds(mod->init_size);
2062 if (!ptr && mod->init_size) {
2066 memset(ptr, 0, mod->init_size);
2067 mod->module_init = ptr;
2069 /* Transfer each section which specifies SHF_ALLOC */
2070 DEBUGP("final section addresses:\n");
2071 for (i = 0; i < hdr->e_shnum; i++) {
2074 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
2077 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
2078 dest = mod->module_init
2079 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
2081 dest = mod->module_core + sechdrs[i].sh_entsize;
2083 if (sechdrs[i].sh_type != SHT_NOBITS)
2084 memcpy(dest, (void *)sechdrs[i].sh_addr,
2085 sechdrs[i].sh_size);
2086 /* Update sh_addr to point to copy in image. */
2087 sechdrs[i].sh_addr = (unsigned long)dest;
2088 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
2090 /* Module has been moved. */
2091 mod = (void *)sechdrs[modindex].sh_addr;
2093 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
2094 mod->refptr = percpu_modalloc(sizeof(local_t), __alignof__(local_t),
2101 /* Now we've moved module, initialize linked lists, etc. */
2102 module_unload_init(mod);
2104 /* add kobject, so we can reference it. */
2105 err = mod_sysfs_init(mod);
2109 /* Set up license info based on the info section */
2110 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
2113 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2114 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2115 * using GPL-only symbols it needs.
2117 if (strcmp(mod->name, "ndiswrapper") == 0)
2118 add_taint(TAINT_PROPRIETARY_MODULE);
2120 /* driverloader was caught wrongly pretending to be under GPL */
2121 if (strcmp(mod->name, "driverloader") == 0)
2122 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2124 /* Set up MODINFO_ATTR fields */
2125 setup_modinfo(mod, sechdrs, infoindex);
2127 /* Fix up syms, so that st_value is a pointer to location. */
2128 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
2133 /* Now we've got everything in the final locations, we can
2134 * find optional sections. */
2135 mod->kp = section_objs(hdr, sechdrs, secstrings, "__param",
2136 sizeof(*mod->kp), &mod->num_kp);
2137 mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
2138 sizeof(*mod->syms), &mod->num_syms);
2139 mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
2140 mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl",
2141 sizeof(*mod->gpl_syms),
2142 &mod->num_gpl_syms);
2143 mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl");
2144 mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings,
2145 "__ksymtab_gpl_future",
2146 sizeof(*mod->gpl_future_syms),
2147 &mod->num_gpl_future_syms);
2148 mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings,
2149 "__kcrctab_gpl_future");
2151 #ifdef CONFIG_UNUSED_SYMBOLS
2152 mod->unused_syms = section_objs(hdr, sechdrs, secstrings,
2154 sizeof(*mod->unused_syms),
2155 &mod->num_unused_syms);
2156 mod->unused_crcs = section_addr(hdr, sechdrs, secstrings,
2157 "__kcrctab_unused");
2158 mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings,
2159 "__ksymtab_unused_gpl",
2160 sizeof(*mod->unused_gpl_syms),
2161 &mod->num_unused_gpl_syms);
2162 mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
2163 "__kcrctab_unused_gpl");
2166 #ifdef CONFIG_MARKERS
2167 mod->markers = section_objs(hdr, sechdrs, secstrings, "__markers",
2168 sizeof(*mod->markers), &mod->num_markers);
2170 #ifdef CONFIG_TRACEPOINTS
2171 mod->tracepoints = section_objs(hdr, sechdrs, secstrings,
2173 sizeof(*mod->tracepoints),
2174 &mod->num_tracepoints);
2176 #ifdef CONFIG_EVENT_TRACING
2177 mod->trace_events = section_objs(hdr, sechdrs, secstrings,
2179 sizeof(*mod->trace_events),
2180 &mod->num_trace_events);
2183 #ifdef CONFIG_MODVERSIONS
2184 if ((mod->num_syms && !mod->crcs)
2185 || (mod->num_gpl_syms && !mod->gpl_crcs)
2186 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2187 #ifdef CONFIG_UNUSED_SYMBOLS
2188 || (mod->num_unused_syms && !mod->unused_crcs)
2189 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2192 err = try_to_force_load(mod,
2193 "no versions for exported symbols");
2199 /* Now do relocations. */
2200 for (i = 1; i < hdr->e_shnum; i++) {
2201 const char *strtab = (char *)sechdrs[strindex].sh_addr;
2202 unsigned int info = sechdrs[i].sh_info;
2204 /* Not a valid relocation section? */
2205 if (info >= hdr->e_shnum)
2208 /* Don't bother with non-allocated sections */
2209 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
2212 if (sechdrs[i].sh_type == SHT_REL)
2213 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
2214 else if (sechdrs[i].sh_type == SHT_RELA)
2215 err = apply_relocate_add(sechdrs, strtab, symindex, i,
2221 /* Find duplicate symbols */
2222 err = verify_export_symbols(mod);
2226 /* Set up and sort exception table */
2227 mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table",
2228 sizeof(*mod->extable), &mod->num_exentries);
2229 sort_extable(mod->extable, mod->extable + mod->num_exentries);
2231 /* Finally, copy percpu area over. */
2232 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
2233 sechdrs[pcpuindex].sh_size);
2235 add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
2238 struct _ddebug *debug;
2239 unsigned int num_debug;
2241 debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
2242 sizeof(*debug), &num_debug);
2244 dynamic_debug_setup(debug, num_debug);
2247 /* sechdrs[0].sh_size is always zero */
2248 mseg = section_objs(hdr, sechdrs, secstrings, "__mcount_loc",
2249 sizeof(*mseg), &num_mcount);
2250 ftrace_init_module(mod, mseg, mseg + num_mcount);
2252 err = module_finalize(hdr, sechdrs, mod);
2256 /* flush the icache in correct context */
2261 * Flush the instruction cache, since we've played with text.
2262 * Do it before processing of module parameters, so the module
2263 * can provide parameter accessor functions of its own.
2265 if (mod->module_init)
2266 flush_icache_range((unsigned long)mod->module_init,
2267 (unsigned long)mod->module_init
2269 flush_icache_range((unsigned long)mod->module_core,
2270 (unsigned long)mod->module_core + mod->core_size);
2275 if (section_addr(hdr, sechdrs, secstrings, "__obsparm"))
2276 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2279 /* Now sew it into the lists so we can get lockdep and oops
2280 * info during argument parsing. Noone should access us, since
2281 * strong_try_module_get() will fail.
2282 * lockdep/oops can run asynchronous, so use the RCU list insertion
2283 * function to insert in a way safe to concurrent readers.
2284 * The mutex protects against concurrent writers.
2286 list_add_rcu(&mod->list, &modules);
2288 err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
2292 err = mod_sysfs_setup(mod, mod->kp, mod->num_kp);
2295 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2296 add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2298 /* Get rid of temporary copy */
2305 /* Unlink carefully: kallsyms could be walking list. */
2306 list_del_rcu(&mod->list);
2307 synchronize_sched();
2308 module_arch_cleanup(mod);
2310 kobject_del(&mod->mkobj.kobj);
2311 kobject_put(&mod->mkobj.kobj);
2312 ftrace_release(mod->module_core, mod->core_size);
2314 module_unload_free(mod);
2315 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
2317 percpu_modfree(mod->refptr);
2319 module_free(mod, mod->module_init);
2321 module_free(mod, mod->module_core);
2322 /* mod will be freed with core. Don't access it beyond this line! */
2325 percpu_modfree(percpu);
2330 return ERR_PTR(err);
2333 printk(KERN_ERR "Module len %lu truncated\n", len);
2338 /* This is where the real work happens */
2339 SYSCALL_DEFINE3(init_module, void __user *, umod,
2340 unsigned long, len, const char __user *, uargs)
2345 /* Must have permission */
2346 if (!capable(CAP_SYS_MODULE))
2349 /* Only one module load at a time, please */
2350 if (mutex_lock_interruptible(&module_mutex) != 0)
2353 /* Do all the hard work */
2354 mod = load_module(umod, len, uargs);
2356 mutex_unlock(&module_mutex);
2357 return PTR_ERR(mod);
2360 /* Drop lock so they can recurse */
2361 mutex_unlock(&module_mutex);
2363 blocking_notifier_call_chain(&module_notify_list,
2364 MODULE_STATE_COMING, mod);
2366 /* Start the module */
2367 if (mod->init != NULL)
2368 ret = do_one_initcall(mod->init);
2370 /* Init routine failed: abort. Try to protect us from
2371 buggy refcounters. */
2372 mod->state = MODULE_STATE_GOING;
2373 synchronize_sched();
2375 blocking_notifier_call_chain(&module_notify_list,
2376 MODULE_STATE_GOING, mod);
2377 mutex_lock(&module_mutex);
2379 mutex_unlock(&module_mutex);
2380 wake_up(&module_wq);
2384 printk(KERN_WARNING "%s: '%s'->init suspiciously returned %d, "
2385 "it should follow 0/-E convention\n"
2386 KERN_WARNING "%s: loading module anyway...\n",
2387 __func__, mod->name, ret,
2392 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2393 mod->state = MODULE_STATE_LIVE;
2394 wake_up(&module_wq);
2395 blocking_notifier_call_chain(&module_notify_list,
2396 MODULE_STATE_LIVE, mod);
2398 /* We need to finish all async code before the module init sequence is done */
2399 async_synchronize_full();
2401 mutex_lock(&module_mutex);
2402 /* Drop initial reference. */
2404 module_free(mod, mod->module_init);
2405 mod->module_init = NULL;
2407 mod->init_text_size = 0;
2408 mutex_unlock(&module_mutex);
2413 static inline int within(unsigned long addr, void *start, unsigned long size)
2415 return ((void *)addr >= start && (void *)addr < start + size);
2418 #ifdef CONFIG_KALLSYMS
2420 * This ignores the intensely annoying "mapping symbols" found
2421 * in ARM ELF files: $a, $t and $d.
2423 static inline int is_arm_mapping_symbol(const char *str)
2425 return str[0] == '$' && strchr("atd", str[1])
2426 && (str[2] == '\0' || str[2] == '.');
2429 static const char *get_ksymbol(struct module *mod,
2431 unsigned long *size,
2432 unsigned long *offset)
2434 unsigned int i, best = 0;
2435 unsigned long nextval;
2437 /* At worse, next value is at end of module */
2438 if (within_module_init(addr, mod))
2439 nextval = (unsigned long)mod->module_init+mod->init_text_size;
2441 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2443 /* Scan for closest preceeding symbol, and next symbol. (ELF
2444 starts real symbols at 1). */
2445 for (i = 1; i < mod->num_symtab; i++) {
2446 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2449 /* We ignore unnamed symbols: they're uninformative
2450 * and inserted at a whim. */
2451 if (mod->symtab[i].st_value <= addr
2452 && mod->symtab[i].st_value > mod->symtab[best].st_value
2453 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2454 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2456 if (mod->symtab[i].st_value > addr
2457 && mod->symtab[i].st_value < nextval
2458 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2459 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2460 nextval = mod->symtab[i].st_value;
2467 *size = nextval - mod->symtab[best].st_value;
2469 *offset = addr - mod->symtab[best].st_value;
2470 return mod->strtab + mod->symtab[best].st_name;
2473 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2474 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2475 const char *module_address_lookup(unsigned long addr,
2476 unsigned long *size,
2477 unsigned long *offset,
2482 const char *ret = NULL;
2485 list_for_each_entry_rcu(mod, &modules, list) {
2486 if (within_module_init(addr, mod) ||
2487 within_module_core(addr, mod)) {
2489 *modname = mod->name;
2490 ret = get_ksymbol(mod, addr, size, offset);
2494 /* Make a copy in here where it's safe */
2496 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
2503 int lookup_module_symbol_name(unsigned long addr, char *symname)
2508 list_for_each_entry_rcu(mod, &modules, list) {
2509 if (within_module_init(addr, mod) ||
2510 within_module_core(addr, mod)) {
2513 sym = get_ksymbol(mod, addr, NULL, NULL);
2516 strlcpy(symname, sym, KSYM_NAME_LEN);
2526 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
2527 unsigned long *offset, char *modname, char *name)
2532 list_for_each_entry_rcu(mod, &modules, list) {
2533 if (within_module_init(addr, mod) ||
2534 within_module_core(addr, mod)) {
2537 sym = get_ksymbol(mod, addr, size, offset);
2541 strlcpy(modname, mod->name, MODULE_NAME_LEN);
2543 strlcpy(name, sym, KSYM_NAME_LEN);
2553 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
2554 char *name, char *module_name, int *exported)
2559 list_for_each_entry_rcu(mod, &modules, list) {
2560 if (symnum < mod->num_symtab) {
2561 *value = mod->symtab[symnum].st_value;
2562 *type = mod->symtab[symnum].st_info;
2563 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2565 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
2566 *exported = is_exported(name, *value, mod);
2570 symnum -= mod->num_symtab;
2576 static unsigned long mod_find_symname(struct module *mod, const char *name)
2580 for (i = 0; i < mod->num_symtab; i++)
2581 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2582 mod->symtab[i].st_info != 'U')
2583 return mod->symtab[i].st_value;
2587 /* Look for this name: can be of form module:name. */
2588 unsigned long module_kallsyms_lookup_name(const char *name)
2592 unsigned long ret = 0;
2594 /* Don't lock: we're in enough trouble already. */
2596 if ((colon = strchr(name, ':')) != NULL) {
2598 if ((mod = find_module(name)) != NULL)
2599 ret = mod_find_symname(mod, colon+1);
2602 list_for_each_entry_rcu(mod, &modules, list)
2603 if ((ret = mod_find_symname(mod, name)) != 0)
2610 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
2611 struct module *, unsigned long),
2618 list_for_each_entry(mod, &modules, list) {
2619 for (i = 0; i < mod->num_symtab; i++) {
2620 ret = fn(data, mod->strtab + mod->symtab[i].st_name,
2621 mod, mod->symtab[i].st_value);
2628 #endif /* CONFIG_KALLSYMS */
2630 static char *module_flags(struct module *mod, char *buf)
2635 mod->state == MODULE_STATE_GOING ||
2636 mod->state == MODULE_STATE_COMING) {
2638 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
2640 if (mod->taints & (1 << TAINT_FORCED_MODULE))
2642 if (mod->taints & (1 << TAINT_CRAP))
2645 * TAINT_FORCED_RMMOD: could be added.
2646 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2650 /* Show a - for module-is-being-unloaded */
2651 if (mod->state == MODULE_STATE_GOING)
2653 /* Show a + for module-is-being-loaded */
2654 if (mod->state == MODULE_STATE_COMING)
2663 #ifdef CONFIG_PROC_FS
2664 /* Called by the /proc file system to return a list of modules. */
2665 static void *m_start(struct seq_file *m, loff_t *pos)
2667 mutex_lock(&module_mutex);
2668 return seq_list_start(&modules, *pos);
2671 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2673 return seq_list_next(p, &modules, pos);
2676 static void m_stop(struct seq_file *m, void *p)
2678 mutex_unlock(&module_mutex);
2681 static int m_show(struct seq_file *m, void *p)
2683 struct module *mod = list_entry(p, struct module, list);
2686 seq_printf(m, "%s %u",
2687 mod->name, mod->init_size + mod->core_size);
2688 print_unload_info(m, mod);
2690 /* Informative for users. */
2691 seq_printf(m, " %s",
2692 mod->state == MODULE_STATE_GOING ? "Unloading":
2693 mod->state == MODULE_STATE_COMING ? "Loading":
2695 /* Used by oprofile and other similar tools. */
2696 seq_printf(m, " 0x%p", mod->module_core);
2700 seq_printf(m, " %s", module_flags(mod, buf));
2702 seq_printf(m, "\n");
2706 /* Format: modulename size refcount deps address
2708 Where refcount is a number or -, and deps is a comma-separated list
2711 static const struct seq_operations modules_op = {
2718 static int modules_open(struct inode *inode, struct file *file)
2720 return seq_open(file, &modules_op);
2723 static const struct file_operations proc_modules_operations = {
2724 .open = modules_open,
2726 .llseek = seq_lseek,
2727 .release = seq_release,
2730 static int __init proc_modules_init(void)
2732 proc_create("modules", 0, NULL, &proc_modules_operations);
2735 module_init(proc_modules_init);
2738 /* Given an address, look for it in the module exception tables. */
2739 const struct exception_table_entry *search_module_extables(unsigned long addr)
2741 const struct exception_table_entry *e = NULL;
2745 list_for_each_entry_rcu(mod, &modules, list) {
2746 if (mod->num_exentries == 0)
2749 e = search_extable(mod->extable,
2750 mod->extable + mod->num_exentries - 1,
2757 /* Now, if we found one, we are running inside it now, hence
2758 we cannot unload the module, hence no refcnt needed. */
2763 * is_module_address - is this address inside a module?
2764 * @addr: the address to check.
2766 * See is_module_text_address() if you simply want to see if the address
2767 * is code (not data).
2769 bool is_module_address(unsigned long addr)
2774 ret = __module_address(addr) != NULL;
2781 * __module_address - get the module which contains an address.
2782 * @addr: the address.
2784 * Must be called with preempt disabled or module mutex held so that
2785 * module doesn't get freed during this.
2787 struct module *__module_address(unsigned long addr)
2791 if (addr < module_addr_min || addr > module_addr_max)
2794 list_for_each_entry_rcu(mod, &modules, list)
2795 if (within_module_core(addr, mod)
2796 || within_module_init(addr, mod))
2800 EXPORT_SYMBOL_GPL(__module_address);
2803 * is_module_text_address - is this address inside module code?
2804 * @addr: the address to check.
2806 * See is_module_address() if you simply want to see if the address is
2807 * anywhere in a module. See kernel_text_address() for testing if an
2808 * address corresponds to kernel or module code.
2810 bool is_module_text_address(unsigned long addr)
2815 ret = __module_text_address(addr) != NULL;
2822 * __module_text_address - get the module whose code contains an address.
2823 * @addr: the address.
2825 * Must be called with preempt disabled or module mutex held so that
2826 * module doesn't get freed during this.
2828 struct module *__module_text_address(unsigned long addr)
2830 struct module *mod = __module_address(addr);
2832 /* Make sure it's within the text section. */
2833 if (!within(addr, mod->module_init, mod->init_text_size)
2834 && !within(addr, mod->module_core, mod->core_text_size))
2839 EXPORT_SYMBOL_GPL(__module_text_address);
2841 /* Don't grab lock, we're oopsing. */
2842 void print_modules(void)
2847 printk("Modules linked in:");
2848 /* Most callers should already have preempt disabled, but make sure */
2850 list_for_each_entry_rcu(mod, &modules, list)
2851 printk(" %s%s", mod->name, module_flags(mod, buf));
2853 if (last_unloaded_module[0])
2854 printk(" [last unloaded: %s]", last_unloaded_module);
2858 #ifdef CONFIG_MODVERSIONS
2859 /* Generate the signature for all relevant module structures here.
2860 * If these change, we don't want to try to parse the module. */
2861 void module_layout(struct module *mod,
2862 struct modversion_info *ver,
2863 struct kernel_param *kp,
2864 struct kernel_symbol *ks,
2865 struct marker *marker,
2866 struct tracepoint *tp)
2869 EXPORT_SYMBOL(module_layout);
2872 #ifdef CONFIG_MARKERS
2873 void module_update_markers(void)
2877 mutex_lock(&module_mutex);
2878 list_for_each_entry(mod, &modules, list)
2880 marker_update_probe_range(mod->markers,
2881 mod->markers + mod->num_markers);
2882 mutex_unlock(&module_mutex);
2886 #ifdef CONFIG_TRACEPOINTS
2887 void module_update_tracepoints(void)
2891 mutex_lock(&module_mutex);
2892 list_for_each_entry(mod, &modules, list)
2894 tracepoint_update_probe_range(mod->tracepoints,
2895 mod->tracepoints + mod->num_tracepoints);
2896 mutex_unlock(&module_mutex);
2900 * Returns 0 if current not found.
2901 * Returns 1 if current found.
2903 int module_get_iter_tracepoints(struct tracepoint_iter *iter)
2905 struct module *iter_mod;
2908 mutex_lock(&module_mutex);
2909 list_for_each_entry(iter_mod, &modules, list) {
2910 if (!iter_mod->taints) {
2912 * Sorted module list
2914 if (iter_mod < iter->module)
2916 else if (iter_mod > iter->module)
2917 iter->tracepoint = NULL;
2918 found = tracepoint_get_iter_range(&iter->tracepoint,
2919 iter_mod->tracepoints,
2920 iter_mod->tracepoints
2921 + iter_mod->num_tracepoints);
2923 iter->module = iter_mod;
2928 mutex_unlock(&module_mutex);