Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* Rewritten by Rusty Russell, on the backs of many others... |
| 2 | Copyright (C) 2002 Richard Henderson |
| 3 | Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM. |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 2 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program; if not, write to the Free Software |
| 17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | */ |
| 19 | #include <linux/config.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/moduleloader.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/vmalloc.h> |
| 25 | #include <linux/elf.h> |
| 26 | #include <linux/seq_file.h> |
| 27 | #include <linux/syscalls.h> |
| 28 | #include <linux/fcntl.h> |
| 29 | #include <linux/rcupdate.h> |
| 30 | #include <linux/cpu.h> |
| 31 | #include <linux/moduleparam.h> |
| 32 | #include <linux/errno.h> |
| 33 | #include <linux/err.h> |
| 34 | #include <linux/vermagic.h> |
| 35 | #include <linux/notifier.h> |
| 36 | #include <linux/stop_machine.h> |
| 37 | #include <linux/device.h> |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 38 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <asm/uaccess.h> |
| 40 | #include <asm/semaphore.h> |
| 41 | #include <asm/cacheflush.h> |
| 42 | |
| 43 | #if 0 |
| 44 | #define DEBUGP printk |
| 45 | #else |
| 46 | #define DEBUGP(fmt , a...) |
| 47 | #endif |
| 48 | |
| 49 | #ifndef ARCH_SHF_SMALL |
| 50 | #define ARCH_SHF_SMALL 0 |
| 51 | #endif |
| 52 | |
| 53 | /* If this is set, the section belongs in the init part of the module */ |
| 54 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) |
| 55 | |
| 56 | /* Protects module list */ |
| 57 | static DEFINE_SPINLOCK(modlist_lock); |
| 58 | |
| 59 | /* List of modules, protected by module_mutex AND modlist_lock */ |
| 60 | static DECLARE_MUTEX(module_mutex); |
| 61 | static LIST_HEAD(modules); |
| 62 | |
| 63 | static DECLARE_MUTEX(notify_mutex); |
| 64 | static struct notifier_block * module_notify_list; |
| 65 | |
| 66 | int register_module_notifier(struct notifier_block * nb) |
| 67 | { |
| 68 | int err; |
| 69 | down(¬ify_mutex); |
| 70 | err = notifier_chain_register(&module_notify_list, nb); |
| 71 | up(¬ify_mutex); |
| 72 | return err; |
| 73 | } |
| 74 | EXPORT_SYMBOL(register_module_notifier); |
| 75 | |
| 76 | int unregister_module_notifier(struct notifier_block * nb) |
| 77 | { |
| 78 | int err; |
| 79 | down(¬ify_mutex); |
| 80 | err = notifier_chain_unregister(&module_notify_list, nb); |
| 81 | up(¬ify_mutex); |
| 82 | return err; |
| 83 | } |
| 84 | EXPORT_SYMBOL(unregister_module_notifier); |
| 85 | |
| 86 | /* We require a truly strong try_module_get() */ |
| 87 | static inline int strong_try_module_get(struct module *mod) |
| 88 | { |
| 89 | if (mod && mod->state == MODULE_STATE_COMING) |
| 90 | return 0; |
| 91 | return try_module_get(mod); |
| 92 | } |
| 93 | |
| 94 | /* A thread that wants to hold a reference to a module only while it |
| 95 | * is running can call ths to safely exit. |
| 96 | * nfsd and lockd use this. |
| 97 | */ |
| 98 | void __module_put_and_exit(struct module *mod, long code) |
| 99 | { |
| 100 | module_put(mod); |
| 101 | do_exit(code); |
| 102 | } |
| 103 | EXPORT_SYMBOL(__module_put_and_exit); |
| 104 | |
| 105 | /* Find a module section: 0 means not found. */ |
| 106 | static unsigned int find_sec(Elf_Ehdr *hdr, |
| 107 | Elf_Shdr *sechdrs, |
| 108 | const char *secstrings, |
| 109 | const char *name) |
| 110 | { |
| 111 | unsigned int i; |
| 112 | |
| 113 | for (i = 1; i < hdr->e_shnum; i++) |
| 114 | /* Alloc bit cleared means "ignore it." */ |
| 115 | if ((sechdrs[i].sh_flags & SHF_ALLOC) |
| 116 | && strcmp(secstrings+sechdrs[i].sh_name, name) == 0) |
| 117 | return i; |
| 118 | return 0; |
| 119 | } |
| 120 | |
| 121 | /* Provided by the linker */ |
| 122 | extern const struct kernel_symbol __start___ksymtab[]; |
| 123 | extern const struct kernel_symbol __stop___ksymtab[]; |
| 124 | extern const struct kernel_symbol __start___ksymtab_gpl[]; |
| 125 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; |
| 126 | extern const unsigned long __start___kcrctab[]; |
| 127 | extern const unsigned long __start___kcrctab_gpl[]; |
| 128 | |
| 129 | #ifndef CONFIG_MODVERSIONS |
| 130 | #define symversion(base, idx) NULL |
| 131 | #else |
| 132 | #define symversion(base, idx) ((base) ? ((base) + (idx)) : NULL) |
| 133 | #endif |
| 134 | |
| 135 | /* Find a symbol, return value, crc and module which owns it */ |
| 136 | static unsigned long __find_symbol(const char *name, |
| 137 | struct module **owner, |
| 138 | const unsigned long **crc, |
| 139 | int gplok) |
| 140 | { |
| 141 | struct module *mod; |
| 142 | unsigned int i; |
| 143 | |
| 144 | /* Core kernel first. */ |
| 145 | *owner = NULL; |
| 146 | for (i = 0; __start___ksymtab+i < __stop___ksymtab; i++) { |
| 147 | if (strcmp(__start___ksymtab[i].name, name) == 0) { |
| 148 | *crc = symversion(__start___kcrctab, i); |
| 149 | return __start___ksymtab[i].value; |
| 150 | } |
| 151 | } |
| 152 | if (gplok) { |
| 153 | for (i = 0; __start___ksymtab_gpl+i<__stop___ksymtab_gpl; i++) |
| 154 | if (strcmp(__start___ksymtab_gpl[i].name, name) == 0) { |
| 155 | *crc = symversion(__start___kcrctab_gpl, i); |
| 156 | return __start___ksymtab_gpl[i].value; |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | /* Now try modules. */ |
| 161 | list_for_each_entry(mod, &modules, list) { |
| 162 | *owner = mod; |
| 163 | for (i = 0; i < mod->num_syms; i++) |
| 164 | if (strcmp(mod->syms[i].name, name) == 0) { |
| 165 | *crc = symversion(mod->crcs, i); |
| 166 | return mod->syms[i].value; |
| 167 | } |
| 168 | |
| 169 | if (gplok) { |
| 170 | for (i = 0; i < mod->num_gpl_syms; i++) { |
| 171 | if (strcmp(mod->gpl_syms[i].name, name) == 0) { |
| 172 | *crc = symversion(mod->gpl_crcs, i); |
| 173 | return mod->gpl_syms[i].value; |
| 174 | } |
| 175 | } |
| 176 | } |
| 177 | } |
| 178 | DEBUGP("Failed to find symbol %s\n", name); |
| 179 | return 0; |
| 180 | } |
| 181 | |
| 182 | /* Find a symbol in this elf symbol table */ |
| 183 | static unsigned long find_local_symbol(Elf_Shdr *sechdrs, |
| 184 | unsigned int symindex, |
| 185 | const char *strtab, |
| 186 | const char *name) |
| 187 | { |
| 188 | unsigned int i; |
| 189 | Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; |
| 190 | |
| 191 | /* Search (defined) internal symbols first. */ |
| 192 | for (i = 1; i < sechdrs[symindex].sh_size/sizeof(*sym); i++) { |
| 193 | if (sym[i].st_shndx != SHN_UNDEF |
| 194 | && strcmp(name, strtab + sym[i].st_name) == 0) |
| 195 | return sym[i].st_value; |
| 196 | } |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | /* Search for module by name: must hold module_mutex. */ |
| 201 | static struct module *find_module(const char *name) |
| 202 | { |
| 203 | struct module *mod; |
| 204 | |
| 205 | list_for_each_entry(mod, &modules, list) { |
| 206 | if (strcmp(mod->name, name) == 0) |
| 207 | return mod; |
| 208 | } |
| 209 | return NULL; |
| 210 | } |
| 211 | |
| 212 | #ifdef CONFIG_SMP |
| 213 | /* Number of blocks used and allocated. */ |
| 214 | static unsigned int pcpu_num_used, pcpu_num_allocated; |
| 215 | /* Size of each block. -ve means used. */ |
| 216 | static int *pcpu_size; |
| 217 | |
| 218 | static int split_block(unsigned int i, unsigned short size) |
| 219 | { |
| 220 | /* Reallocation required? */ |
| 221 | if (pcpu_num_used + 1 > pcpu_num_allocated) { |
| 222 | int *new = kmalloc(sizeof(new[0]) * pcpu_num_allocated*2, |
| 223 | GFP_KERNEL); |
| 224 | if (!new) |
| 225 | return 0; |
| 226 | |
| 227 | memcpy(new, pcpu_size, sizeof(new[0])*pcpu_num_allocated); |
| 228 | pcpu_num_allocated *= 2; |
| 229 | kfree(pcpu_size); |
| 230 | pcpu_size = new; |
| 231 | } |
| 232 | |
| 233 | /* Insert a new subblock */ |
| 234 | memmove(&pcpu_size[i+1], &pcpu_size[i], |
| 235 | sizeof(pcpu_size[0]) * (pcpu_num_used - i)); |
| 236 | pcpu_num_used++; |
| 237 | |
| 238 | pcpu_size[i+1] -= size; |
| 239 | pcpu_size[i] = size; |
| 240 | return 1; |
| 241 | } |
| 242 | |
| 243 | static inline unsigned int block_size(int val) |
| 244 | { |
| 245 | if (val < 0) |
| 246 | return -val; |
| 247 | return val; |
| 248 | } |
| 249 | |
| 250 | /* Created by linker magic */ |
| 251 | extern char __per_cpu_start[], __per_cpu_end[]; |
| 252 | |
Rusty Russell | 842bbaa | 2005-08-01 21:11:47 -0700 | [diff] [blame] | 253 | static void *percpu_modalloc(unsigned long size, unsigned long align, |
| 254 | const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | { |
| 256 | unsigned long extra; |
| 257 | unsigned int i; |
| 258 | void *ptr; |
| 259 | |
Rusty Russell | 842bbaa | 2005-08-01 21:11:47 -0700 | [diff] [blame] | 260 | if (align > SMP_CACHE_BYTES) { |
| 261 | printk(KERN_WARNING "%s: per-cpu alignment %li > %i\n", |
| 262 | name, align, SMP_CACHE_BYTES); |
| 263 | align = SMP_CACHE_BYTES; |
| 264 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | |
| 266 | ptr = __per_cpu_start; |
| 267 | for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { |
| 268 | /* Extra for alignment requirement. */ |
| 269 | extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr; |
| 270 | BUG_ON(i == 0 && extra != 0); |
| 271 | |
| 272 | if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size) |
| 273 | continue; |
| 274 | |
| 275 | /* Transfer extra to previous block. */ |
| 276 | if (pcpu_size[i-1] < 0) |
| 277 | pcpu_size[i-1] -= extra; |
| 278 | else |
| 279 | pcpu_size[i-1] += extra; |
| 280 | pcpu_size[i] -= extra; |
| 281 | ptr += extra; |
| 282 | |
| 283 | /* Split block if warranted */ |
| 284 | if (pcpu_size[i] - size > sizeof(unsigned long)) |
| 285 | if (!split_block(i, size)) |
| 286 | return NULL; |
| 287 | |
| 288 | /* Mark allocated */ |
| 289 | pcpu_size[i] = -pcpu_size[i]; |
| 290 | return ptr; |
| 291 | } |
| 292 | |
| 293 | printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n", |
| 294 | size); |
| 295 | return NULL; |
| 296 | } |
| 297 | |
| 298 | static void percpu_modfree(void *freeme) |
| 299 | { |
| 300 | unsigned int i; |
| 301 | void *ptr = __per_cpu_start + block_size(pcpu_size[0]); |
| 302 | |
| 303 | /* First entry is core kernel percpu data. */ |
| 304 | for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { |
| 305 | if (ptr == freeme) { |
| 306 | pcpu_size[i] = -pcpu_size[i]; |
| 307 | goto free; |
| 308 | } |
| 309 | } |
| 310 | BUG(); |
| 311 | |
| 312 | free: |
| 313 | /* Merge with previous? */ |
| 314 | if (pcpu_size[i-1] >= 0) { |
| 315 | pcpu_size[i-1] += pcpu_size[i]; |
| 316 | pcpu_num_used--; |
| 317 | memmove(&pcpu_size[i], &pcpu_size[i+1], |
| 318 | (pcpu_num_used - i) * sizeof(pcpu_size[0])); |
| 319 | i--; |
| 320 | } |
| 321 | /* Merge with next? */ |
| 322 | if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) { |
| 323 | pcpu_size[i] += pcpu_size[i+1]; |
| 324 | pcpu_num_used--; |
| 325 | memmove(&pcpu_size[i+1], &pcpu_size[i+2], |
| 326 | (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0])); |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | static unsigned int find_pcpusec(Elf_Ehdr *hdr, |
| 331 | Elf_Shdr *sechdrs, |
| 332 | const char *secstrings) |
| 333 | { |
| 334 | return find_sec(hdr, sechdrs, secstrings, ".data.percpu"); |
| 335 | } |
| 336 | |
| 337 | static int percpu_modinit(void) |
| 338 | { |
| 339 | pcpu_num_used = 2; |
| 340 | pcpu_num_allocated = 2; |
| 341 | pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated, |
| 342 | GFP_KERNEL); |
| 343 | /* Static in-kernel percpu data (used). */ |
| 344 | pcpu_size[0] = -ALIGN(__per_cpu_end-__per_cpu_start, SMP_CACHE_BYTES); |
| 345 | /* Free room. */ |
| 346 | pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0]; |
| 347 | if (pcpu_size[1] < 0) { |
| 348 | printk(KERN_ERR "No per-cpu room for modules.\n"); |
| 349 | pcpu_num_used = 1; |
| 350 | } |
| 351 | |
| 352 | return 0; |
| 353 | } |
| 354 | __initcall(percpu_modinit); |
| 355 | #else /* ... !CONFIG_SMP */ |
Rusty Russell | 842bbaa | 2005-08-01 21:11:47 -0700 | [diff] [blame] | 356 | static inline void *percpu_modalloc(unsigned long size, unsigned long align, |
| 357 | const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | { |
| 359 | return NULL; |
| 360 | } |
| 361 | static inline void percpu_modfree(void *pcpuptr) |
| 362 | { |
| 363 | BUG(); |
| 364 | } |
| 365 | static inline unsigned int find_pcpusec(Elf_Ehdr *hdr, |
| 366 | Elf_Shdr *sechdrs, |
| 367 | const char *secstrings) |
| 368 | { |
| 369 | return 0; |
| 370 | } |
| 371 | static inline void percpu_modcopy(void *pcpudst, const void *src, |
| 372 | unsigned long size) |
| 373 | { |
| 374 | /* pcpusec should be 0, and size of that section should be 0. */ |
| 375 | BUG_ON(size != 0); |
| 376 | } |
| 377 | #endif /* CONFIG_SMP */ |
| 378 | |
| 379 | #ifdef CONFIG_MODULE_UNLOAD |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 380 | #define MODINFO_ATTR(field) \ |
| 381 | static void setup_modinfo_##field(struct module *mod, const char *s) \ |
| 382 | { \ |
| 383 | mod->field = kstrdup(s, GFP_KERNEL); \ |
| 384 | } \ |
| 385 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ |
| 386 | struct module *mod, char *buffer) \ |
| 387 | { \ |
| 388 | return sprintf(buffer, "%s\n", mod->field); \ |
| 389 | } \ |
| 390 | static int modinfo_##field##_exists(struct module *mod) \ |
| 391 | { \ |
| 392 | return mod->field != NULL; \ |
| 393 | } \ |
| 394 | static void free_modinfo_##field(struct module *mod) \ |
| 395 | { \ |
| 396 | kfree(mod->field); \ |
| 397 | mod->field = NULL; \ |
| 398 | } \ |
| 399 | static struct module_attribute modinfo_##field = { \ |
| 400 | .attr = { .name = __stringify(field), .mode = 0444, \ |
| 401 | .owner = THIS_MODULE }, \ |
| 402 | .show = show_modinfo_##field, \ |
| 403 | .setup = setup_modinfo_##field, \ |
| 404 | .test = modinfo_##field##_exists, \ |
| 405 | .free = free_modinfo_##field, \ |
| 406 | }; |
| 407 | |
| 408 | MODINFO_ATTR(version); |
| 409 | MODINFO_ATTR(srcversion); |
| 410 | |
| 411 | static struct module_attribute *modinfo_attrs[] = { |
| 412 | &modinfo_version, |
| 413 | &modinfo_srcversion, |
| 414 | NULL, |
| 415 | }; |
| 416 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | /* Init the unload section of the module. */ |
| 418 | static void module_unload_init(struct module *mod) |
| 419 | { |
| 420 | unsigned int i; |
| 421 | |
| 422 | INIT_LIST_HEAD(&mod->modules_which_use_me); |
| 423 | for (i = 0; i < NR_CPUS; i++) |
| 424 | local_set(&mod->ref[i].count, 0); |
| 425 | /* Hold reference count during initialization. */ |
Ingo Molnar | 39c715b | 2005-06-21 17:14:34 -0700 | [diff] [blame] | 426 | local_set(&mod->ref[raw_smp_processor_id()].count, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | /* Backwards compatibility macros put refcount during init. */ |
| 428 | mod->waiter = current; |
| 429 | } |
| 430 | |
| 431 | /* modules using other modules */ |
| 432 | struct module_use |
| 433 | { |
| 434 | struct list_head list; |
| 435 | struct module *module_which_uses; |
| 436 | }; |
| 437 | |
| 438 | /* Does a already use b? */ |
| 439 | static int already_uses(struct module *a, struct module *b) |
| 440 | { |
| 441 | struct module_use *use; |
| 442 | |
| 443 | list_for_each_entry(use, &b->modules_which_use_me, list) { |
| 444 | if (use->module_which_uses == a) { |
| 445 | DEBUGP("%s uses %s!\n", a->name, b->name); |
| 446 | return 1; |
| 447 | } |
| 448 | } |
| 449 | DEBUGP("%s does not use %s!\n", a->name, b->name); |
| 450 | return 0; |
| 451 | } |
| 452 | |
| 453 | /* Module a uses b */ |
| 454 | static int use_module(struct module *a, struct module *b) |
| 455 | { |
| 456 | struct module_use *use; |
| 457 | if (b == NULL || already_uses(a, b)) return 1; |
| 458 | |
| 459 | if (!strong_try_module_get(b)) |
| 460 | return 0; |
| 461 | |
| 462 | DEBUGP("Allocating new usage for %s.\n", a->name); |
| 463 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
| 464 | if (!use) { |
| 465 | printk("%s: out of memory loading\n", a->name); |
| 466 | module_put(b); |
| 467 | return 0; |
| 468 | } |
| 469 | |
| 470 | use->module_which_uses = a; |
| 471 | list_add(&use->list, &b->modules_which_use_me); |
| 472 | return 1; |
| 473 | } |
| 474 | |
| 475 | /* Clear the unload stuff of the module. */ |
| 476 | static void module_unload_free(struct module *mod) |
| 477 | { |
| 478 | struct module *i; |
| 479 | |
| 480 | list_for_each_entry(i, &modules, list) { |
| 481 | struct module_use *use; |
| 482 | |
| 483 | list_for_each_entry(use, &i->modules_which_use_me, list) { |
| 484 | if (use->module_which_uses == mod) { |
| 485 | DEBUGP("%s unusing %s\n", mod->name, i->name); |
| 486 | module_put(i); |
| 487 | list_del(&use->list); |
| 488 | kfree(use); |
| 489 | /* There can be at most one match. */ |
| 490 | break; |
| 491 | } |
| 492 | } |
| 493 | } |
| 494 | } |
| 495 | |
| 496 | #ifdef CONFIG_MODULE_FORCE_UNLOAD |
| 497 | static inline int try_force(unsigned int flags) |
| 498 | { |
| 499 | int ret = (flags & O_TRUNC); |
| 500 | if (ret) |
| 501 | tainted |= TAINT_FORCED_MODULE; |
| 502 | return ret; |
| 503 | } |
| 504 | #else |
| 505 | static inline int try_force(unsigned int flags) |
| 506 | { |
| 507 | return 0; |
| 508 | } |
| 509 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ |
| 510 | |
| 511 | struct stopref |
| 512 | { |
| 513 | struct module *mod; |
| 514 | int flags; |
| 515 | int *forced; |
| 516 | }; |
| 517 | |
| 518 | /* Whole machine is stopped with interrupts off when this runs. */ |
| 519 | static int __try_stop_module(void *_sref) |
| 520 | { |
| 521 | struct stopref *sref = _sref; |
| 522 | |
| 523 | /* If it's not unused, quit unless we are told to block. */ |
| 524 | if ((sref->flags & O_NONBLOCK) && module_refcount(sref->mod) != 0) { |
| 525 | if (!(*sref->forced = try_force(sref->flags))) |
| 526 | return -EWOULDBLOCK; |
| 527 | } |
| 528 | |
| 529 | /* Mark it as dying. */ |
| 530 | sref->mod->state = MODULE_STATE_GOING; |
| 531 | return 0; |
| 532 | } |
| 533 | |
| 534 | static int try_stop_module(struct module *mod, int flags, int *forced) |
| 535 | { |
| 536 | struct stopref sref = { mod, flags, forced }; |
| 537 | |
| 538 | return stop_machine_run(__try_stop_module, &sref, NR_CPUS); |
| 539 | } |
| 540 | |
| 541 | unsigned int module_refcount(struct module *mod) |
| 542 | { |
| 543 | unsigned int i, total = 0; |
| 544 | |
| 545 | for (i = 0; i < NR_CPUS; i++) |
| 546 | total += local_read(&mod->ref[i].count); |
| 547 | return total; |
| 548 | } |
| 549 | EXPORT_SYMBOL(module_refcount); |
| 550 | |
| 551 | /* This exists whether we can unload or not */ |
| 552 | static void free_module(struct module *mod); |
| 553 | |
| 554 | static void wait_for_zero_refcount(struct module *mod) |
| 555 | { |
| 556 | /* Since we might sleep for some time, drop the semaphore first */ |
| 557 | up(&module_mutex); |
| 558 | for (;;) { |
| 559 | DEBUGP("Looking at refcount...\n"); |
| 560 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 561 | if (module_refcount(mod) == 0) |
| 562 | break; |
| 563 | schedule(); |
| 564 | } |
| 565 | current->state = TASK_RUNNING; |
| 566 | down(&module_mutex); |
| 567 | } |
| 568 | |
| 569 | asmlinkage long |
| 570 | sys_delete_module(const char __user *name_user, unsigned int flags) |
| 571 | { |
| 572 | struct module *mod; |
| 573 | char name[MODULE_NAME_LEN]; |
| 574 | int ret, forced = 0; |
| 575 | |
| 576 | if (!capable(CAP_SYS_MODULE)) |
| 577 | return -EPERM; |
| 578 | |
| 579 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) |
| 580 | return -EFAULT; |
| 581 | name[MODULE_NAME_LEN-1] = '\0'; |
| 582 | |
| 583 | if (down_interruptible(&module_mutex) != 0) |
| 584 | return -EINTR; |
| 585 | |
| 586 | mod = find_module(name); |
| 587 | if (!mod) { |
| 588 | ret = -ENOENT; |
| 589 | goto out; |
| 590 | } |
| 591 | |
| 592 | if (!list_empty(&mod->modules_which_use_me)) { |
| 593 | /* Other modules depend on us: get rid of them first. */ |
| 594 | ret = -EWOULDBLOCK; |
| 595 | goto out; |
| 596 | } |
| 597 | |
| 598 | /* Doing init or already dying? */ |
| 599 | if (mod->state != MODULE_STATE_LIVE) { |
| 600 | /* FIXME: if (force), slam module count and wake up |
| 601 | waiter --RR */ |
| 602 | DEBUGP("%s already dying\n", mod->name); |
| 603 | ret = -EBUSY; |
| 604 | goto out; |
| 605 | } |
| 606 | |
| 607 | /* If it has an init func, it must have an exit func to unload */ |
| 608 | if ((mod->init != NULL && mod->exit == NULL) |
| 609 | || mod->unsafe) { |
| 610 | forced = try_force(flags); |
| 611 | if (!forced) { |
| 612 | /* This module can't be removed */ |
| 613 | ret = -EBUSY; |
| 614 | goto out; |
| 615 | } |
| 616 | } |
| 617 | |
| 618 | /* Set this up before setting mod->state */ |
| 619 | mod->waiter = current; |
| 620 | |
| 621 | /* Stop the machine so refcounts can't move and disable module. */ |
| 622 | ret = try_stop_module(mod, flags, &forced); |
| 623 | if (ret != 0) |
| 624 | goto out; |
| 625 | |
| 626 | /* Never wait if forced. */ |
| 627 | if (!forced && module_refcount(mod) != 0) |
| 628 | wait_for_zero_refcount(mod); |
| 629 | |
| 630 | /* Final destruction now noone is using it. */ |
| 631 | if (mod->exit != NULL) { |
| 632 | up(&module_mutex); |
| 633 | mod->exit(); |
| 634 | down(&module_mutex); |
| 635 | } |
| 636 | free_module(mod); |
| 637 | |
| 638 | out: |
| 639 | up(&module_mutex); |
| 640 | return ret; |
| 641 | } |
| 642 | |
| 643 | static void print_unload_info(struct seq_file *m, struct module *mod) |
| 644 | { |
| 645 | struct module_use *use; |
| 646 | int printed_something = 0; |
| 647 | |
| 648 | seq_printf(m, " %u ", module_refcount(mod)); |
| 649 | |
| 650 | /* Always include a trailing , so userspace can differentiate |
| 651 | between this and the old multi-field proc format. */ |
| 652 | list_for_each_entry(use, &mod->modules_which_use_me, list) { |
| 653 | printed_something = 1; |
| 654 | seq_printf(m, "%s,", use->module_which_uses->name); |
| 655 | } |
| 656 | |
| 657 | if (mod->unsafe) { |
| 658 | printed_something = 1; |
| 659 | seq_printf(m, "[unsafe],"); |
| 660 | } |
| 661 | |
| 662 | if (mod->init != NULL && mod->exit == NULL) { |
| 663 | printed_something = 1; |
| 664 | seq_printf(m, "[permanent],"); |
| 665 | } |
| 666 | |
| 667 | if (!printed_something) |
| 668 | seq_printf(m, "-"); |
| 669 | } |
| 670 | |
| 671 | void __symbol_put(const char *symbol) |
| 672 | { |
| 673 | struct module *owner; |
| 674 | unsigned long flags; |
| 675 | const unsigned long *crc; |
| 676 | |
| 677 | spin_lock_irqsave(&modlist_lock, flags); |
| 678 | if (!__find_symbol(symbol, &owner, &crc, 1)) |
| 679 | BUG(); |
| 680 | module_put(owner); |
| 681 | spin_unlock_irqrestore(&modlist_lock, flags); |
| 682 | } |
| 683 | EXPORT_SYMBOL(__symbol_put); |
| 684 | |
| 685 | void symbol_put_addr(void *addr) |
| 686 | { |
| 687 | unsigned long flags; |
| 688 | |
| 689 | spin_lock_irqsave(&modlist_lock, flags); |
| 690 | if (!kernel_text_address((unsigned long)addr)) |
| 691 | BUG(); |
| 692 | |
| 693 | module_put(module_text_address((unsigned long)addr)); |
| 694 | spin_unlock_irqrestore(&modlist_lock, flags); |
| 695 | } |
| 696 | EXPORT_SYMBOL_GPL(symbol_put_addr); |
| 697 | |
| 698 | static ssize_t show_refcnt(struct module_attribute *mattr, |
| 699 | struct module *mod, char *buffer) |
| 700 | { |
| 701 | /* sysfs holds a reference */ |
| 702 | return sprintf(buffer, "%u\n", module_refcount(mod)-1); |
| 703 | } |
| 704 | |
| 705 | static struct module_attribute refcnt = { |
| 706 | .attr = { .name = "refcnt", .mode = 0444, .owner = THIS_MODULE }, |
| 707 | .show = show_refcnt, |
| 708 | }; |
| 709 | |
| 710 | #else /* !CONFIG_MODULE_UNLOAD */ |
| 711 | static void print_unload_info(struct seq_file *m, struct module *mod) |
| 712 | { |
| 713 | /* We don't know the usage count, or what modules are using. */ |
| 714 | seq_printf(m, " - -"); |
| 715 | } |
| 716 | |
| 717 | static inline void module_unload_free(struct module *mod) |
| 718 | { |
| 719 | } |
| 720 | |
| 721 | static inline int use_module(struct module *a, struct module *b) |
| 722 | { |
| 723 | return strong_try_module_get(b); |
| 724 | } |
| 725 | |
| 726 | static inline void module_unload_init(struct module *mod) |
| 727 | { |
| 728 | } |
| 729 | #endif /* CONFIG_MODULE_UNLOAD */ |
| 730 | |
| 731 | #ifdef CONFIG_OBSOLETE_MODPARM |
| 732 | /* Bounds checking done below */ |
| 733 | static int obsparm_copy_string(const char *val, struct kernel_param *kp) |
| 734 | { |
| 735 | strcpy(kp->arg, val); |
| 736 | return 0; |
| 737 | } |
| 738 | |
Adrian Bunk | 52c1da3 | 2005-06-23 22:05:33 -0700 | [diff] [blame] | 739 | static int set_obsolete(const char *val, struct kernel_param *kp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | { |
| 741 | unsigned int min, max; |
| 742 | unsigned int size, maxsize; |
| 743 | int dummy; |
| 744 | char *endp; |
| 745 | const char *p; |
| 746 | struct obsolete_modparm *obsparm = kp->arg; |
| 747 | |
| 748 | if (!val) { |
| 749 | printk(KERN_ERR "Parameter %s needs an argument\n", kp->name); |
| 750 | return -EINVAL; |
| 751 | } |
| 752 | |
| 753 | /* type is: [min[-max]]{b,h,i,l,s} */ |
| 754 | p = obsparm->type; |
| 755 | min = simple_strtol(p, &endp, 10); |
| 756 | if (endp == obsparm->type) |
| 757 | min = max = 1; |
| 758 | else if (*endp == '-') { |
| 759 | p = endp+1; |
| 760 | max = simple_strtol(p, &endp, 10); |
| 761 | } else |
| 762 | max = min; |
| 763 | switch (*endp) { |
| 764 | case 'b': |
| 765 | return param_array(kp->name, val, min, max, obsparm->addr, |
| 766 | 1, param_set_byte, &dummy); |
| 767 | case 'h': |
| 768 | return param_array(kp->name, val, min, max, obsparm->addr, |
| 769 | sizeof(short), param_set_short, &dummy); |
| 770 | case 'i': |
| 771 | return param_array(kp->name, val, min, max, obsparm->addr, |
| 772 | sizeof(int), param_set_int, &dummy); |
| 773 | case 'l': |
| 774 | return param_array(kp->name, val, min, max, obsparm->addr, |
| 775 | sizeof(long), param_set_long, &dummy); |
| 776 | case 's': |
| 777 | return param_array(kp->name, val, min, max, obsparm->addr, |
| 778 | sizeof(char *), param_set_charp, &dummy); |
| 779 | |
| 780 | case 'c': |
| 781 | /* Undocumented: 1-5c50 means 1-5 strings of up to 49 chars, |
| 782 | and the decl is "char xxx[5][50];" */ |
| 783 | p = endp+1; |
| 784 | maxsize = simple_strtol(p, &endp, 10); |
| 785 | /* We check lengths here (yes, this is a hack). */ |
| 786 | p = val; |
| 787 | while (p[size = strcspn(p, ",")]) { |
| 788 | if (size >= maxsize) |
| 789 | goto oversize; |
| 790 | p += size+1; |
| 791 | } |
| 792 | if (size >= maxsize) |
| 793 | goto oversize; |
| 794 | return param_array(kp->name, val, min, max, obsparm->addr, |
| 795 | maxsize, obsparm_copy_string, &dummy); |
| 796 | } |
| 797 | printk(KERN_ERR "Unknown obsolete parameter type %s\n", obsparm->type); |
| 798 | return -EINVAL; |
| 799 | oversize: |
| 800 | printk(KERN_ERR |
| 801 | "Parameter %s doesn't fit in %u chars.\n", kp->name, maxsize); |
| 802 | return -EINVAL; |
| 803 | } |
| 804 | |
| 805 | static int obsolete_params(const char *name, |
| 806 | char *args, |
| 807 | struct obsolete_modparm obsparm[], |
| 808 | unsigned int num, |
| 809 | Elf_Shdr *sechdrs, |
| 810 | unsigned int symindex, |
| 811 | const char *strtab) |
| 812 | { |
| 813 | struct kernel_param *kp; |
| 814 | unsigned int i; |
| 815 | int ret; |
| 816 | |
| 817 | kp = kmalloc(sizeof(kp[0]) * num, GFP_KERNEL); |
| 818 | if (!kp) |
| 819 | return -ENOMEM; |
| 820 | |
| 821 | for (i = 0; i < num; i++) { |
| 822 | char sym_name[128 + sizeof(MODULE_SYMBOL_PREFIX)]; |
| 823 | |
| 824 | snprintf(sym_name, sizeof(sym_name), "%s%s", |
| 825 | MODULE_SYMBOL_PREFIX, obsparm[i].name); |
| 826 | |
| 827 | kp[i].name = obsparm[i].name; |
| 828 | kp[i].perm = 000; |
| 829 | kp[i].set = set_obsolete; |
| 830 | kp[i].get = NULL; |
| 831 | obsparm[i].addr |
| 832 | = (void *)find_local_symbol(sechdrs, symindex, strtab, |
| 833 | sym_name); |
| 834 | if (!obsparm[i].addr) { |
| 835 | printk("%s: falsely claims to have parameter %s\n", |
| 836 | name, obsparm[i].name); |
| 837 | ret = -EINVAL; |
| 838 | goto out; |
| 839 | } |
| 840 | kp[i].arg = &obsparm[i]; |
| 841 | } |
| 842 | |
| 843 | ret = parse_args(name, args, kp, num, NULL); |
| 844 | out: |
| 845 | kfree(kp); |
| 846 | return ret; |
| 847 | } |
| 848 | #else |
| 849 | static int obsolete_params(const char *name, |
| 850 | char *args, |
| 851 | struct obsolete_modparm obsparm[], |
| 852 | unsigned int num, |
| 853 | Elf_Shdr *sechdrs, |
| 854 | unsigned int symindex, |
| 855 | const char *strtab) |
| 856 | { |
| 857 | if (num != 0) |
| 858 | printk(KERN_WARNING "%s: Ignoring obsolete parameters\n", |
| 859 | name); |
| 860 | return 0; |
| 861 | } |
| 862 | #endif /* CONFIG_OBSOLETE_MODPARM */ |
| 863 | |
| 864 | static const char vermagic[] = VERMAGIC_STRING; |
| 865 | |
| 866 | #ifdef CONFIG_MODVERSIONS |
| 867 | static int check_version(Elf_Shdr *sechdrs, |
| 868 | unsigned int versindex, |
| 869 | const char *symname, |
| 870 | struct module *mod, |
| 871 | const unsigned long *crc) |
| 872 | { |
| 873 | unsigned int i, num_versions; |
| 874 | struct modversion_info *versions; |
| 875 | |
| 876 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ |
| 877 | if (!crc) |
| 878 | return 1; |
| 879 | |
| 880 | versions = (void *) sechdrs[versindex].sh_addr; |
| 881 | num_versions = sechdrs[versindex].sh_size |
| 882 | / sizeof(struct modversion_info); |
| 883 | |
| 884 | for (i = 0; i < num_versions; i++) { |
| 885 | if (strcmp(versions[i].name, symname) != 0) |
| 886 | continue; |
| 887 | |
| 888 | if (versions[i].crc == *crc) |
| 889 | return 1; |
| 890 | printk("%s: disagrees about version of symbol %s\n", |
| 891 | mod->name, symname); |
| 892 | DEBUGP("Found checksum %lX vs module %lX\n", |
| 893 | *crc, versions[i].crc); |
| 894 | return 0; |
| 895 | } |
| 896 | /* Not in module's version table. OK, but that taints the kernel. */ |
| 897 | if (!(tainted & TAINT_FORCED_MODULE)) { |
| 898 | printk("%s: no version for \"%s\" found: kernel tainted.\n", |
| 899 | mod->name, symname); |
| 900 | tainted |= TAINT_FORCED_MODULE; |
| 901 | } |
| 902 | return 1; |
| 903 | } |
| 904 | |
| 905 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, |
| 906 | unsigned int versindex, |
| 907 | struct module *mod) |
| 908 | { |
| 909 | const unsigned long *crc; |
| 910 | struct module *owner; |
| 911 | |
| 912 | if (!__find_symbol("struct_module", &owner, &crc, 1)) |
| 913 | BUG(); |
| 914 | return check_version(sechdrs, versindex, "struct_module", mod, |
| 915 | crc); |
| 916 | } |
| 917 | |
| 918 | /* First part is kernel version, which we ignore. */ |
| 919 | static inline int same_magic(const char *amagic, const char *bmagic) |
| 920 | { |
| 921 | amagic += strcspn(amagic, " "); |
| 922 | bmagic += strcspn(bmagic, " "); |
| 923 | return strcmp(amagic, bmagic) == 0; |
| 924 | } |
| 925 | #else |
| 926 | static inline int check_version(Elf_Shdr *sechdrs, |
| 927 | unsigned int versindex, |
| 928 | const char *symname, |
| 929 | struct module *mod, |
| 930 | const unsigned long *crc) |
| 931 | { |
| 932 | return 1; |
| 933 | } |
| 934 | |
| 935 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, |
| 936 | unsigned int versindex, |
| 937 | struct module *mod) |
| 938 | { |
| 939 | return 1; |
| 940 | } |
| 941 | |
| 942 | static inline int same_magic(const char *amagic, const char *bmagic) |
| 943 | { |
| 944 | return strcmp(amagic, bmagic) == 0; |
| 945 | } |
| 946 | #endif /* CONFIG_MODVERSIONS */ |
| 947 | |
| 948 | /* Resolve a symbol for this module. I.e. if we find one, record usage. |
| 949 | Must be holding module_mutex. */ |
| 950 | static unsigned long resolve_symbol(Elf_Shdr *sechdrs, |
| 951 | unsigned int versindex, |
| 952 | const char *name, |
| 953 | struct module *mod) |
| 954 | { |
| 955 | struct module *owner; |
| 956 | unsigned long ret; |
| 957 | const unsigned long *crc; |
| 958 | |
| 959 | spin_lock_irq(&modlist_lock); |
| 960 | ret = __find_symbol(name, &owner, &crc, mod->license_gplok); |
| 961 | if (ret) { |
| 962 | /* use_module can fail due to OOM, or module unloading */ |
| 963 | if (!check_version(sechdrs, versindex, name, mod, crc) || |
| 964 | !use_module(mod, owner)) |
| 965 | ret = 0; |
| 966 | } |
| 967 | spin_unlock_irq(&modlist_lock); |
| 968 | return ret; |
| 969 | } |
| 970 | |
| 971 | |
| 972 | /* |
| 973 | * /sys/module/foo/sections stuff |
| 974 | * J. Corbet <corbet@lwn.net> |
| 975 | */ |
| 976 | #ifdef CONFIG_KALLSYMS |
| 977 | static ssize_t module_sect_show(struct module_attribute *mattr, |
| 978 | struct module *mod, char *buf) |
| 979 | { |
| 980 | struct module_sect_attr *sattr = |
| 981 | container_of(mattr, struct module_sect_attr, mattr); |
| 982 | return sprintf(buf, "0x%lx\n", sattr->address); |
| 983 | } |
| 984 | |
| 985 | static void add_sect_attrs(struct module *mod, unsigned int nsect, |
| 986 | char *secstrings, Elf_Shdr *sechdrs) |
| 987 | { |
| 988 | unsigned int nloaded = 0, i, size[2]; |
| 989 | struct module_sect_attrs *sect_attrs; |
| 990 | struct module_sect_attr *sattr; |
| 991 | struct attribute **gattr; |
| 992 | |
| 993 | /* Count loaded sections and allocate structures */ |
| 994 | for (i = 0; i < nsect; i++) |
| 995 | if (sechdrs[i].sh_flags & SHF_ALLOC) |
| 996 | nloaded++; |
| 997 | size[0] = ALIGN(sizeof(*sect_attrs) |
| 998 | + nloaded * sizeof(sect_attrs->attrs[0]), |
| 999 | sizeof(sect_attrs->grp.attrs[0])); |
| 1000 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); |
| 1001 | if (! (sect_attrs = kmalloc(size[0] + size[1], GFP_KERNEL))) |
| 1002 | return; |
| 1003 | |
| 1004 | /* Setup section attributes. */ |
| 1005 | sect_attrs->grp.name = "sections"; |
| 1006 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; |
| 1007 | |
| 1008 | sattr = §_attrs->attrs[0]; |
| 1009 | gattr = §_attrs->grp.attrs[0]; |
| 1010 | for (i = 0; i < nsect; i++) { |
| 1011 | if (! (sechdrs[i].sh_flags & SHF_ALLOC)) |
| 1012 | continue; |
| 1013 | sattr->address = sechdrs[i].sh_addr; |
| 1014 | strlcpy(sattr->name, secstrings + sechdrs[i].sh_name, |
| 1015 | MODULE_SECT_NAME_LEN); |
| 1016 | sattr->mattr.show = module_sect_show; |
| 1017 | sattr->mattr.store = NULL; |
| 1018 | sattr->mattr.attr.name = sattr->name; |
| 1019 | sattr->mattr.attr.owner = mod; |
| 1020 | sattr->mattr.attr.mode = S_IRUGO; |
| 1021 | *(gattr++) = &(sattr++)->mattr.attr; |
| 1022 | } |
| 1023 | *gattr = NULL; |
| 1024 | |
| 1025 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) |
| 1026 | goto out; |
| 1027 | |
| 1028 | mod->sect_attrs = sect_attrs; |
| 1029 | return; |
| 1030 | out: |
| 1031 | kfree(sect_attrs); |
| 1032 | } |
| 1033 | |
| 1034 | static void remove_sect_attrs(struct module *mod) |
| 1035 | { |
| 1036 | if (mod->sect_attrs) { |
| 1037 | sysfs_remove_group(&mod->mkobj.kobj, |
| 1038 | &mod->sect_attrs->grp); |
| 1039 | /* We are positive that no one is using any sect attrs |
| 1040 | * at this point. Deallocate immediately. */ |
| 1041 | kfree(mod->sect_attrs); |
| 1042 | mod->sect_attrs = NULL; |
| 1043 | } |
| 1044 | } |
| 1045 | |
| 1046 | |
| 1047 | #else |
| 1048 | static inline void add_sect_attrs(struct module *mod, unsigned int nsect, |
| 1049 | char *sectstrings, Elf_Shdr *sechdrs) |
| 1050 | { |
| 1051 | } |
| 1052 | |
| 1053 | static inline void remove_sect_attrs(struct module *mod) |
| 1054 | { |
| 1055 | } |
| 1056 | #endif /* CONFIG_KALLSYMS */ |
| 1057 | |
| 1058 | |
| 1059 | #ifdef CONFIG_MODULE_UNLOAD |
| 1060 | static inline int module_add_refcnt_attr(struct module *mod) |
| 1061 | { |
| 1062 | return sysfs_create_file(&mod->mkobj.kobj, &refcnt.attr); |
| 1063 | } |
| 1064 | static void module_remove_refcnt_attr(struct module *mod) |
| 1065 | { |
| 1066 | return sysfs_remove_file(&mod->mkobj.kobj, &refcnt.attr); |
| 1067 | } |
| 1068 | #else |
| 1069 | static inline int module_add_refcnt_attr(struct module *mod) |
| 1070 | { |
| 1071 | return 0; |
| 1072 | } |
| 1073 | static void module_remove_refcnt_attr(struct module *mod) |
| 1074 | { |
| 1075 | } |
| 1076 | #endif |
| 1077 | |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1078 | #ifdef CONFIG_MODULE_UNLOAD |
| 1079 | static int module_add_modinfo_attrs(struct module *mod) |
| 1080 | { |
| 1081 | struct module_attribute *attr; |
| 1082 | int error = 0; |
| 1083 | int i; |
| 1084 | |
| 1085 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
| 1086 | if (!attr->test || |
| 1087 | (attr->test && attr->test(mod))) |
| 1088 | error = sysfs_create_file(&mod->mkobj.kobj,&attr->attr); |
| 1089 | } |
| 1090 | return error; |
| 1091 | } |
| 1092 | |
| 1093 | static void module_remove_modinfo_attrs(struct module *mod) |
| 1094 | { |
| 1095 | struct module_attribute *attr; |
| 1096 | int i; |
| 1097 | |
| 1098 | for (i = 0; (attr = modinfo_attrs[i]); i++) { |
| 1099 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
| 1100 | attr->free(mod); |
| 1101 | } |
| 1102 | } |
| 1103 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | |
| 1105 | static int mod_sysfs_setup(struct module *mod, |
| 1106 | struct kernel_param *kparam, |
| 1107 | unsigned int num_params) |
| 1108 | { |
| 1109 | int err; |
| 1110 | |
| 1111 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
| 1112 | err = kobject_set_name(&mod->mkobj.kobj, "%s", mod->name); |
| 1113 | if (err) |
| 1114 | goto out; |
| 1115 | kobj_set_kset_s(&mod->mkobj, module_subsys); |
| 1116 | mod->mkobj.mod = mod; |
| 1117 | err = kobject_register(&mod->mkobj.kobj); |
| 1118 | if (err) |
| 1119 | goto out; |
| 1120 | |
| 1121 | err = module_add_refcnt_attr(mod); |
| 1122 | if (err) |
| 1123 | goto out_unreg; |
| 1124 | |
| 1125 | err = module_param_sysfs_setup(mod, kparam, num_params); |
| 1126 | if (err) |
| 1127 | goto out_unreg; |
| 1128 | |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1129 | #ifdef CONFIG_MODULE_UNLOAD |
| 1130 | err = module_add_modinfo_attrs(mod); |
| 1131 | if (err) |
| 1132 | goto out_unreg; |
| 1133 | #endif |
| 1134 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | return 0; |
| 1136 | |
| 1137 | out_unreg: |
| 1138 | kobject_unregister(&mod->mkobj.kobj); |
| 1139 | out: |
| 1140 | return err; |
| 1141 | } |
| 1142 | |
| 1143 | static void mod_kobject_remove(struct module *mod) |
| 1144 | { |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1145 | #ifdef CONFIG_MODULE_UNLOAD |
| 1146 | module_remove_modinfo_attrs(mod); |
| 1147 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | module_remove_refcnt_attr(mod); |
| 1149 | module_param_sysfs_remove(mod); |
| 1150 | |
| 1151 | kobject_unregister(&mod->mkobj.kobj); |
| 1152 | } |
| 1153 | |
| 1154 | /* |
| 1155 | * unlink the module with the whole machine is stopped with interrupts off |
| 1156 | * - this defends against kallsyms not taking locks |
| 1157 | */ |
| 1158 | static int __unlink_module(void *_mod) |
| 1159 | { |
| 1160 | struct module *mod = _mod; |
| 1161 | list_del(&mod->list); |
| 1162 | return 0; |
| 1163 | } |
| 1164 | |
| 1165 | /* Free a module, remove from lists, etc (must hold module mutex). */ |
| 1166 | static void free_module(struct module *mod) |
| 1167 | { |
| 1168 | /* Delete from various lists */ |
| 1169 | stop_machine_run(__unlink_module, mod, NR_CPUS); |
| 1170 | remove_sect_attrs(mod); |
| 1171 | mod_kobject_remove(mod); |
| 1172 | |
| 1173 | /* Arch-specific cleanup. */ |
| 1174 | module_arch_cleanup(mod); |
| 1175 | |
| 1176 | /* Module unload stuff */ |
| 1177 | module_unload_free(mod); |
| 1178 | |
| 1179 | /* This may be NULL, but that's OK */ |
| 1180 | module_free(mod, mod->module_init); |
| 1181 | kfree(mod->args); |
| 1182 | if (mod->percpu) |
| 1183 | percpu_modfree(mod->percpu); |
| 1184 | |
| 1185 | /* Finally, free the core (containing the module structure) */ |
| 1186 | module_free(mod, mod->module_core); |
| 1187 | } |
| 1188 | |
| 1189 | void *__symbol_get(const char *symbol) |
| 1190 | { |
| 1191 | struct module *owner; |
| 1192 | unsigned long value, flags; |
| 1193 | const unsigned long *crc; |
| 1194 | |
| 1195 | spin_lock_irqsave(&modlist_lock, flags); |
| 1196 | value = __find_symbol(symbol, &owner, &crc, 1); |
| 1197 | if (value && !strong_try_module_get(owner)) |
| 1198 | value = 0; |
| 1199 | spin_unlock_irqrestore(&modlist_lock, flags); |
| 1200 | |
| 1201 | return (void *)value; |
| 1202 | } |
| 1203 | EXPORT_SYMBOL_GPL(__symbol_get); |
| 1204 | |
| 1205 | /* Change all symbols so that sh_value encodes the pointer directly. */ |
| 1206 | static int simplify_symbols(Elf_Shdr *sechdrs, |
| 1207 | unsigned int symindex, |
| 1208 | const char *strtab, |
| 1209 | unsigned int versindex, |
| 1210 | unsigned int pcpuindex, |
| 1211 | struct module *mod) |
| 1212 | { |
| 1213 | Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; |
| 1214 | unsigned long secbase; |
| 1215 | unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); |
| 1216 | int ret = 0; |
| 1217 | |
| 1218 | for (i = 1; i < n; i++) { |
| 1219 | switch (sym[i].st_shndx) { |
| 1220 | case SHN_COMMON: |
| 1221 | /* We compiled with -fno-common. These are not |
| 1222 | supposed to happen. */ |
| 1223 | DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name); |
| 1224 | printk("%s: please compile with -fno-common\n", |
| 1225 | mod->name); |
| 1226 | ret = -ENOEXEC; |
| 1227 | break; |
| 1228 | |
| 1229 | case SHN_ABS: |
| 1230 | /* Don't need to do anything */ |
| 1231 | DEBUGP("Absolute symbol: 0x%08lx\n", |
| 1232 | (long)sym[i].st_value); |
| 1233 | break; |
| 1234 | |
| 1235 | case SHN_UNDEF: |
| 1236 | sym[i].st_value |
| 1237 | = resolve_symbol(sechdrs, versindex, |
| 1238 | strtab + sym[i].st_name, mod); |
| 1239 | |
| 1240 | /* Ok if resolved. */ |
| 1241 | if (sym[i].st_value != 0) |
| 1242 | break; |
| 1243 | /* Ok if weak. */ |
| 1244 | if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
| 1245 | break; |
| 1246 | |
| 1247 | printk(KERN_WARNING "%s: Unknown symbol %s\n", |
| 1248 | mod->name, strtab + sym[i].st_name); |
| 1249 | ret = -ENOENT; |
| 1250 | break; |
| 1251 | |
| 1252 | default: |
| 1253 | /* Divert to percpu allocation if a percpu var. */ |
| 1254 | if (sym[i].st_shndx == pcpuindex) |
| 1255 | secbase = (unsigned long)mod->percpu; |
| 1256 | else |
| 1257 | secbase = sechdrs[sym[i].st_shndx].sh_addr; |
| 1258 | sym[i].st_value += secbase; |
| 1259 | break; |
| 1260 | } |
| 1261 | } |
| 1262 | |
| 1263 | return ret; |
| 1264 | } |
| 1265 | |
| 1266 | /* Update size with this section: return offset. */ |
| 1267 | static long get_offset(unsigned long *size, Elf_Shdr *sechdr) |
| 1268 | { |
| 1269 | long ret; |
| 1270 | |
| 1271 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
| 1272 | *size = ret + sechdr->sh_size; |
| 1273 | return ret; |
| 1274 | } |
| 1275 | |
| 1276 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld |
| 1277 | might -- code, read-only data, read-write data, small data. Tally |
| 1278 | sizes, and place the offsets into sh_entsize fields: high bit means it |
| 1279 | belongs in init. */ |
| 1280 | static void layout_sections(struct module *mod, |
| 1281 | const Elf_Ehdr *hdr, |
| 1282 | Elf_Shdr *sechdrs, |
| 1283 | const char *secstrings) |
| 1284 | { |
| 1285 | static unsigned long const masks[][2] = { |
| 1286 | /* NOTE: all executable code must be the first section |
| 1287 | * in this array; otherwise modify the text_size |
| 1288 | * finder in the two loops below */ |
| 1289 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, |
| 1290 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, |
| 1291 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
| 1292 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } |
| 1293 | }; |
| 1294 | unsigned int m, i; |
| 1295 | |
| 1296 | for (i = 0; i < hdr->e_shnum; i++) |
| 1297 | sechdrs[i].sh_entsize = ~0UL; |
| 1298 | |
| 1299 | DEBUGP("Core section allocation order:\n"); |
| 1300 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
| 1301 | for (i = 0; i < hdr->e_shnum; ++i) { |
| 1302 | Elf_Shdr *s = &sechdrs[i]; |
| 1303 | |
| 1304 | if ((s->sh_flags & masks[m][0]) != masks[m][0] |
| 1305 | || (s->sh_flags & masks[m][1]) |
| 1306 | || s->sh_entsize != ~0UL |
| 1307 | || strncmp(secstrings + s->sh_name, |
| 1308 | ".init", 5) == 0) |
| 1309 | continue; |
| 1310 | s->sh_entsize = get_offset(&mod->core_size, s); |
| 1311 | DEBUGP("\t%s\n", secstrings + s->sh_name); |
| 1312 | } |
| 1313 | if (m == 0) |
| 1314 | mod->core_text_size = mod->core_size; |
| 1315 | } |
| 1316 | |
| 1317 | DEBUGP("Init section allocation order:\n"); |
| 1318 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
| 1319 | for (i = 0; i < hdr->e_shnum; ++i) { |
| 1320 | Elf_Shdr *s = &sechdrs[i]; |
| 1321 | |
| 1322 | if ((s->sh_flags & masks[m][0]) != masks[m][0] |
| 1323 | || (s->sh_flags & masks[m][1]) |
| 1324 | || s->sh_entsize != ~0UL |
| 1325 | || strncmp(secstrings + s->sh_name, |
| 1326 | ".init", 5) != 0) |
| 1327 | continue; |
| 1328 | s->sh_entsize = (get_offset(&mod->init_size, s) |
| 1329 | | INIT_OFFSET_MASK); |
| 1330 | DEBUGP("\t%s\n", secstrings + s->sh_name); |
| 1331 | } |
| 1332 | if (m == 0) |
| 1333 | mod->init_text_size = mod->init_size; |
| 1334 | } |
| 1335 | } |
| 1336 | |
| 1337 | static inline int license_is_gpl_compatible(const char *license) |
| 1338 | { |
| 1339 | return (strcmp(license, "GPL") == 0 |
| 1340 | || strcmp(license, "GPL v2") == 0 |
| 1341 | || strcmp(license, "GPL and additional rights") == 0 |
| 1342 | || strcmp(license, "Dual BSD/GPL") == 0 |
| 1343 | || strcmp(license, "Dual MPL/GPL") == 0); |
| 1344 | } |
| 1345 | |
| 1346 | static void set_license(struct module *mod, const char *license) |
| 1347 | { |
| 1348 | if (!license) |
| 1349 | license = "unspecified"; |
| 1350 | |
| 1351 | mod->license_gplok = license_is_gpl_compatible(license); |
| 1352 | if (!mod->license_gplok && !(tainted & TAINT_PROPRIETARY_MODULE)) { |
| 1353 | printk(KERN_WARNING "%s: module license '%s' taints kernel.\n", |
| 1354 | mod->name, license); |
| 1355 | tainted |= TAINT_PROPRIETARY_MODULE; |
| 1356 | } |
| 1357 | } |
| 1358 | |
| 1359 | /* Parse tag=value strings from .modinfo section */ |
| 1360 | static char *next_string(char *string, unsigned long *secsize) |
| 1361 | { |
| 1362 | /* Skip non-zero chars */ |
| 1363 | while (string[0]) { |
| 1364 | string++; |
| 1365 | if ((*secsize)-- <= 1) |
| 1366 | return NULL; |
| 1367 | } |
| 1368 | |
| 1369 | /* Skip any zero padding. */ |
| 1370 | while (!string[0]) { |
| 1371 | string++; |
| 1372 | if ((*secsize)-- <= 1) |
| 1373 | return NULL; |
| 1374 | } |
| 1375 | return string; |
| 1376 | } |
| 1377 | |
| 1378 | static char *get_modinfo(Elf_Shdr *sechdrs, |
| 1379 | unsigned int info, |
| 1380 | const char *tag) |
| 1381 | { |
| 1382 | char *p; |
| 1383 | unsigned int taglen = strlen(tag); |
| 1384 | unsigned long size = sechdrs[info].sh_size; |
| 1385 | |
| 1386 | for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) { |
| 1387 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
| 1388 | return p + taglen + 1; |
| 1389 | } |
| 1390 | return NULL; |
| 1391 | } |
| 1392 | |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1393 | #ifdef CONFIG_MODULE_UNLOAD |
| 1394 | static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs, |
| 1395 | unsigned int infoindex) |
| 1396 | { |
| 1397 | struct module_attribute *attr; |
| 1398 | int i; |
| 1399 | |
| 1400 | for (i = 0; (attr = modinfo_attrs[i]); i++) { |
| 1401 | if (attr->setup) |
| 1402 | attr->setup(mod, |
| 1403 | get_modinfo(sechdrs, |
| 1404 | infoindex, |
| 1405 | attr->attr.name)); |
| 1406 | } |
| 1407 | } |
| 1408 | #endif |
| 1409 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1410 | #ifdef CONFIG_KALLSYMS |
| 1411 | int is_exported(const char *name, const struct module *mod) |
| 1412 | { |
| 1413 | unsigned int i; |
| 1414 | |
| 1415 | if (!mod) { |
| 1416 | for (i = 0; __start___ksymtab+i < __stop___ksymtab; i++) |
| 1417 | if (strcmp(__start___ksymtab[i].name, name) == 0) |
| 1418 | return 1; |
| 1419 | return 0; |
| 1420 | } |
| 1421 | for (i = 0; i < mod->num_syms; i++) |
| 1422 | if (strcmp(mod->syms[i].name, name) == 0) |
| 1423 | return 1; |
| 1424 | return 0; |
| 1425 | } |
| 1426 | |
| 1427 | /* As per nm */ |
| 1428 | static char elf_type(const Elf_Sym *sym, |
| 1429 | Elf_Shdr *sechdrs, |
| 1430 | const char *secstrings, |
| 1431 | struct module *mod) |
| 1432 | { |
| 1433 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
| 1434 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) |
| 1435 | return 'v'; |
| 1436 | else |
| 1437 | return 'w'; |
| 1438 | } |
| 1439 | if (sym->st_shndx == SHN_UNDEF) |
| 1440 | return 'U'; |
| 1441 | if (sym->st_shndx == SHN_ABS) |
| 1442 | return 'a'; |
| 1443 | if (sym->st_shndx >= SHN_LORESERVE) |
| 1444 | return '?'; |
| 1445 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) |
| 1446 | return 't'; |
| 1447 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC |
| 1448 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { |
| 1449 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) |
| 1450 | return 'r'; |
| 1451 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) |
| 1452 | return 'g'; |
| 1453 | else |
| 1454 | return 'd'; |
| 1455 | } |
| 1456 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { |
| 1457 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) |
| 1458 | return 's'; |
| 1459 | else |
| 1460 | return 'b'; |
| 1461 | } |
| 1462 | if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name, |
| 1463 | ".debug", strlen(".debug")) == 0) |
| 1464 | return 'n'; |
| 1465 | return '?'; |
| 1466 | } |
| 1467 | |
| 1468 | static void add_kallsyms(struct module *mod, |
| 1469 | Elf_Shdr *sechdrs, |
| 1470 | unsigned int symindex, |
| 1471 | unsigned int strindex, |
| 1472 | const char *secstrings) |
| 1473 | { |
| 1474 | unsigned int i; |
| 1475 | |
| 1476 | mod->symtab = (void *)sechdrs[symindex].sh_addr; |
| 1477 | mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym); |
| 1478 | mod->strtab = (void *)sechdrs[strindex].sh_addr; |
| 1479 | |
| 1480 | /* Set types up while we still have access to sections. */ |
| 1481 | for (i = 0; i < mod->num_symtab; i++) |
| 1482 | mod->symtab[i].st_info |
| 1483 | = elf_type(&mod->symtab[i], sechdrs, secstrings, mod); |
| 1484 | } |
| 1485 | #else |
| 1486 | static inline void add_kallsyms(struct module *mod, |
| 1487 | Elf_Shdr *sechdrs, |
| 1488 | unsigned int symindex, |
| 1489 | unsigned int strindex, |
| 1490 | const char *secstrings) |
| 1491 | { |
| 1492 | } |
| 1493 | #endif /* CONFIG_KALLSYMS */ |
| 1494 | |
| 1495 | /* Allocate and load the module: note that size of section 0 is always |
| 1496 | zero, and we rely on this for optional sections. */ |
| 1497 | static struct module *load_module(void __user *umod, |
| 1498 | unsigned long len, |
| 1499 | const char __user *uargs) |
| 1500 | { |
| 1501 | Elf_Ehdr *hdr; |
| 1502 | Elf_Shdr *sechdrs; |
| 1503 | char *secstrings, *args, *modmagic, *strtab = NULL; |
| 1504 | unsigned int i, symindex = 0, strindex = 0, setupindex, exindex, |
| 1505 | exportindex, modindex, obsparmindex, infoindex, gplindex, |
| 1506 | crcindex, gplcrcindex, versindex, pcpuindex; |
| 1507 | long arglen; |
| 1508 | struct module *mod; |
| 1509 | long err = 0; |
| 1510 | void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */ |
| 1511 | struct exception_table_entry *extable; |
| 1512 | |
| 1513 | DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n", |
| 1514 | umod, len, uargs); |
| 1515 | if (len < sizeof(*hdr)) |
| 1516 | return ERR_PTR(-ENOEXEC); |
| 1517 | |
| 1518 | /* Suck in entire file: we'll want most of it. */ |
| 1519 | /* vmalloc barfs on "unusual" numbers. Check here */ |
| 1520 | if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL) |
| 1521 | return ERR_PTR(-ENOMEM); |
| 1522 | if (copy_from_user(hdr, umod, len) != 0) { |
| 1523 | err = -EFAULT; |
| 1524 | goto free_hdr; |
| 1525 | } |
| 1526 | |
| 1527 | /* Sanity checks against insmoding binaries or wrong arch, |
| 1528 | weird elf version */ |
| 1529 | if (memcmp(hdr->e_ident, ELFMAG, 4) != 0 |
| 1530 | || hdr->e_type != ET_REL |
| 1531 | || !elf_check_arch(hdr) |
| 1532 | || hdr->e_shentsize != sizeof(*sechdrs)) { |
| 1533 | err = -ENOEXEC; |
| 1534 | goto free_hdr; |
| 1535 | } |
| 1536 | |
| 1537 | if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) |
| 1538 | goto truncated; |
| 1539 | |
| 1540 | /* Convenience variables */ |
| 1541 | sechdrs = (void *)hdr + hdr->e_shoff; |
| 1542 | secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; |
| 1543 | sechdrs[0].sh_addr = 0; |
| 1544 | |
| 1545 | for (i = 1; i < hdr->e_shnum; i++) { |
| 1546 | if (sechdrs[i].sh_type != SHT_NOBITS |
| 1547 | && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) |
| 1548 | goto truncated; |
| 1549 | |
| 1550 | /* Mark all sections sh_addr with their address in the |
| 1551 | temporary image. */ |
| 1552 | sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset; |
| 1553 | |
| 1554 | /* Internal symbols and strings. */ |
| 1555 | if (sechdrs[i].sh_type == SHT_SYMTAB) { |
| 1556 | symindex = i; |
| 1557 | strindex = sechdrs[i].sh_link; |
| 1558 | strtab = (char *)hdr + sechdrs[strindex].sh_offset; |
| 1559 | } |
| 1560 | #ifndef CONFIG_MODULE_UNLOAD |
| 1561 | /* Don't load .exit sections */ |
| 1562 | if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0) |
| 1563 | sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC; |
| 1564 | #endif |
| 1565 | } |
| 1566 | |
| 1567 | modindex = find_sec(hdr, sechdrs, secstrings, |
| 1568 | ".gnu.linkonce.this_module"); |
| 1569 | if (!modindex) { |
| 1570 | printk(KERN_WARNING "No module found in object\n"); |
| 1571 | err = -ENOEXEC; |
| 1572 | goto free_hdr; |
| 1573 | } |
| 1574 | mod = (void *)sechdrs[modindex].sh_addr; |
| 1575 | |
| 1576 | if (symindex == 0) { |
| 1577 | printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", |
| 1578 | mod->name); |
| 1579 | err = -ENOEXEC; |
| 1580 | goto free_hdr; |
| 1581 | } |
| 1582 | |
| 1583 | /* Optional sections */ |
| 1584 | exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab"); |
| 1585 | gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl"); |
| 1586 | crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab"); |
| 1587 | gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl"); |
| 1588 | setupindex = find_sec(hdr, sechdrs, secstrings, "__param"); |
| 1589 | exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table"); |
| 1590 | obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm"); |
| 1591 | versindex = find_sec(hdr, sechdrs, secstrings, "__versions"); |
| 1592 | infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo"); |
| 1593 | pcpuindex = find_pcpusec(hdr, sechdrs, secstrings); |
| 1594 | |
| 1595 | /* Don't keep modinfo section */ |
| 1596 | sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
| 1597 | #ifdef CONFIG_KALLSYMS |
| 1598 | /* Keep symbol and string tables for decoding later. */ |
| 1599 | sechdrs[symindex].sh_flags |= SHF_ALLOC; |
| 1600 | sechdrs[strindex].sh_flags |= SHF_ALLOC; |
| 1601 | #endif |
| 1602 | |
| 1603 | /* Check module struct version now, before we try to use module. */ |
| 1604 | if (!check_modstruct_version(sechdrs, versindex, mod)) { |
| 1605 | err = -ENOEXEC; |
| 1606 | goto free_hdr; |
| 1607 | } |
| 1608 | |
| 1609 | modmagic = get_modinfo(sechdrs, infoindex, "vermagic"); |
| 1610 | /* This is allowed: modprobe --force will invalidate it. */ |
| 1611 | if (!modmagic) { |
| 1612 | tainted |= TAINT_FORCED_MODULE; |
| 1613 | printk(KERN_WARNING "%s: no version magic, tainting kernel.\n", |
| 1614 | mod->name); |
| 1615 | } else if (!same_magic(modmagic, vermagic)) { |
| 1616 | printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", |
| 1617 | mod->name, modmagic, vermagic); |
| 1618 | err = -ENOEXEC; |
| 1619 | goto free_hdr; |
| 1620 | } |
| 1621 | |
| 1622 | /* Now copy in args */ |
| 1623 | arglen = strlen_user(uargs); |
| 1624 | if (!arglen) { |
| 1625 | err = -EFAULT; |
| 1626 | goto free_hdr; |
| 1627 | } |
| 1628 | args = kmalloc(arglen, GFP_KERNEL); |
| 1629 | if (!args) { |
| 1630 | err = -ENOMEM; |
| 1631 | goto free_hdr; |
| 1632 | } |
| 1633 | if (copy_from_user(args, uargs, arglen) != 0) { |
| 1634 | err = -EFAULT; |
| 1635 | goto free_mod; |
| 1636 | } |
| 1637 | |
| 1638 | if (find_module(mod->name)) { |
| 1639 | err = -EEXIST; |
| 1640 | goto free_mod; |
| 1641 | } |
| 1642 | |
| 1643 | mod->state = MODULE_STATE_COMING; |
| 1644 | |
| 1645 | /* Allow arches to frob section contents and sizes. */ |
| 1646 | err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod); |
| 1647 | if (err < 0) |
| 1648 | goto free_mod; |
| 1649 | |
| 1650 | if (pcpuindex) { |
| 1651 | /* We have a special allocation for this section. */ |
| 1652 | percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size, |
Rusty Russell | 842bbaa | 2005-08-01 21:11:47 -0700 | [diff] [blame] | 1653 | sechdrs[pcpuindex].sh_addralign, |
| 1654 | mod->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | if (!percpu) { |
| 1656 | err = -ENOMEM; |
| 1657 | goto free_mod; |
| 1658 | } |
| 1659 | sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
| 1660 | mod->percpu = percpu; |
| 1661 | } |
| 1662 | |
| 1663 | /* Determine total sizes, and put offsets in sh_entsize. For now |
| 1664 | this is done generically; there doesn't appear to be any |
| 1665 | special cases for the architectures. */ |
| 1666 | layout_sections(mod, hdr, sechdrs, secstrings); |
| 1667 | |
| 1668 | /* Do the allocs. */ |
| 1669 | ptr = module_alloc(mod->core_size); |
| 1670 | if (!ptr) { |
| 1671 | err = -ENOMEM; |
| 1672 | goto free_percpu; |
| 1673 | } |
| 1674 | memset(ptr, 0, mod->core_size); |
| 1675 | mod->module_core = ptr; |
| 1676 | |
| 1677 | ptr = module_alloc(mod->init_size); |
| 1678 | if (!ptr && mod->init_size) { |
| 1679 | err = -ENOMEM; |
| 1680 | goto free_core; |
| 1681 | } |
| 1682 | memset(ptr, 0, mod->init_size); |
| 1683 | mod->module_init = ptr; |
| 1684 | |
| 1685 | /* Transfer each section which specifies SHF_ALLOC */ |
| 1686 | DEBUGP("final section addresses:\n"); |
| 1687 | for (i = 0; i < hdr->e_shnum; i++) { |
| 1688 | void *dest; |
| 1689 | |
| 1690 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) |
| 1691 | continue; |
| 1692 | |
| 1693 | if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK) |
| 1694 | dest = mod->module_init |
| 1695 | + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK); |
| 1696 | else |
| 1697 | dest = mod->module_core + sechdrs[i].sh_entsize; |
| 1698 | |
| 1699 | if (sechdrs[i].sh_type != SHT_NOBITS) |
| 1700 | memcpy(dest, (void *)sechdrs[i].sh_addr, |
| 1701 | sechdrs[i].sh_size); |
| 1702 | /* Update sh_addr to point to copy in image. */ |
| 1703 | sechdrs[i].sh_addr = (unsigned long)dest; |
| 1704 | DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name); |
| 1705 | } |
| 1706 | /* Module has been moved. */ |
| 1707 | mod = (void *)sechdrs[modindex].sh_addr; |
| 1708 | |
| 1709 | /* Now we've moved module, initialize linked lists, etc. */ |
| 1710 | module_unload_init(mod); |
| 1711 | |
| 1712 | /* Set up license info based on the info section */ |
| 1713 | set_license(mod, get_modinfo(sechdrs, infoindex, "license")); |
| 1714 | |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1715 | #ifdef CONFIG_MODULE_UNLOAD |
| 1716 | /* Set up MODINFO_ATTR fields */ |
| 1717 | setup_modinfo(mod, sechdrs, infoindex); |
| 1718 | #endif |
| 1719 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1720 | /* Fix up syms, so that st_value is a pointer to location. */ |
| 1721 | err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex, |
| 1722 | mod); |
| 1723 | if (err < 0) |
| 1724 | goto cleanup; |
| 1725 | |
| 1726 | /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */ |
| 1727 | mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms); |
| 1728 | mod->syms = (void *)sechdrs[exportindex].sh_addr; |
| 1729 | if (crcindex) |
| 1730 | mod->crcs = (void *)sechdrs[crcindex].sh_addr; |
| 1731 | mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms); |
| 1732 | mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr; |
| 1733 | if (gplcrcindex) |
| 1734 | mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr; |
| 1735 | |
| 1736 | #ifdef CONFIG_MODVERSIONS |
| 1737 | if ((mod->num_syms && !crcindex) || |
| 1738 | (mod->num_gpl_syms && !gplcrcindex)) { |
| 1739 | printk(KERN_WARNING "%s: No versions for exported symbols." |
| 1740 | " Tainting kernel.\n", mod->name); |
| 1741 | tainted |= TAINT_FORCED_MODULE; |
| 1742 | } |
| 1743 | #endif |
| 1744 | |
| 1745 | /* Now do relocations. */ |
| 1746 | for (i = 1; i < hdr->e_shnum; i++) { |
| 1747 | const char *strtab = (char *)sechdrs[strindex].sh_addr; |
| 1748 | unsigned int info = sechdrs[i].sh_info; |
| 1749 | |
| 1750 | /* Not a valid relocation section? */ |
| 1751 | if (info >= hdr->e_shnum) |
| 1752 | continue; |
| 1753 | |
| 1754 | /* Don't bother with non-allocated sections */ |
| 1755 | if (!(sechdrs[info].sh_flags & SHF_ALLOC)) |
| 1756 | continue; |
| 1757 | |
| 1758 | if (sechdrs[i].sh_type == SHT_REL) |
| 1759 | err = apply_relocate(sechdrs, strtab, symindex, i,mod); |
| 1760 | else if (sechdrs[i].sh_type == SHT_RELA) |
| 1761 | err = apply_relocate_add(sechdrs, strtab, symindex, i, |
| 1762 | mod); |
| 1763 | if (err < 0) |
| 1764 | goto cleanup; |
| 1765 | } |
| 1766 | |
| 1767 | /* Set up and sort exception table */ |
| 1768 | mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable); |
| 1769 | mod->extable = extable = (void *)sechdrs[exindex].sh_addr; |
| 1770 | sort_extable(extable, extable + mod->num_exentries); |
| 1771 | |
| 1772 | /* Finally, copy percpu area over. */ |
| 1773 | percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr, |
| 1774 | sechdrs[pcpuindex].sh_size); |
| 1775 | |
| 1776 | add_kallsyms(mod, sechdrs, symindex, strindex, secstrings); |
| 1777 | |
| 1778 | err = module_finalize(hdr, sechdrs, mod); |
| 1779 | if (err < 0) |
| 1780 | goto cleanup; |
| 1781 | |
| 1782 | mod->args = args; |
| 1783 | if (obsparmindex) { |
| 1784 | err = obsolete_params(mod->name, mod->args, |
| 1785 | (struct obsolete_modparm *) |
| 1786 | sechdrs[obsparmindex].sh_addr, |
| 1787 | sechdrs[obsparmindex].sh_size |
| 1788 | / sizeof(struct obsolete_modparm), |
| 1789 | sechdrs, symindex, |
| 1790 | (char *)sechdrs[strindex].sh_addr); |
| 1791 | if (setupindex) |
| 1792 | printk(KERN_WARNING "%s: Ignoring new-style " |
| 1793 | "parameters in presence of obsolete ones\n", |
| 1794 | mod->name); |
| 1795 | } else { |
| 1796 | /* Size of section 0 is 0, so this works well if no params */ |
| 1797 | err = parse_args(mod->name, mod->args, |
| 1798 | (struct kernel_param *) |
| 1799 | sechdrs[setupindex].sh_addr, |
| 1800 | sechdrs[setupindex].sh_size |
| 1801 | / sizeof(struct kernel_param), |
| 1802 | NULL); |
| 1803 | } |
| 1804 | if (err < 0) |
| 1805 | goto arch_cleanup; |
| 1806 | |
| 1807 | err = mod_sysfs_setup(mod, |
| 1808 | (struct kernel_param *) |
| 1809 | sechdrs[setupindex].sh_addr, |
| 1810 | sechdrs[setupindex].sh_size |
| 1811 | / sizeof(struct kernel_param)); |
| 1812 | if (err < 0) |
| 1813 | goto arch_cleanup; |
| 1814 | add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
| 1815 | |
| 1816 | /* Get rid of temporary copy */ |
| 1817 | vfree(hdr); |
| 1818 | |
| 1819 | /* Done! */ |
| 1820 | return mod; |
| 1821 | |
| 1822 | arch_cleanup: |
| 1823 | module_arch_cleanup(mod); |
| 1824 | cleanup: |
| 1825 | module_unload_free(mod); |
| 1826 | module_free(mod, mod->module_init); |
| 1827 | free_core: |
| 1828 | module_free(mod, mod->module_core); |
| 1829 | free_percpu: |
| 1830 | if (percpu) |
| 1831 | percpu_modfree(percpu); |
| 1832 | free_mod: |
| 1833 | kfree(args); |
| 1834 | free_hdr: |
| 1835 | vfree(hdr); |
| 1836 | if (err < 0) return ERR_PTR(err); |
| 1837 | else return ptr; |
| 1838 | |
| 1839 | truncated: |
| 1840 | printk(KERN_ERR "Module len %lu truncated\n", len); |
| 1841 | err = -ENOEXEC; |
| 1842 | goto free_hdr; |
| 1843 | } |
| 1844 | |
| 1845 | /* |
| 1846 | * link the module with the whole machine is stopped with interrupts off |
| 1847 | * - this defends against kallsyms not taking locks |
| 1848 | */ |
| 1849 | static int __link_module(void *_mod) |
| 1850 | { |
| 1851 | struct module *mod = _mod; |
| 1852 | list_add(&mod->list, &modules); |
| 1853 | return 0; |
| 1854 | } |
| 1855 | |
| 1856 | /* This is where the real work happens */ |
| 1857 | asmlinkage long |
| 1858 | sys_init_module(void __user *umod, |
| 1859 | unsigned long len, |
| 1860 | const char __user *uargs) |
| 1861 | { |
| 1862 | struct module *mod; |
Roman Zippel | ae92ef8 | 2005-05-31 14:39:29 -0700 | [diff] [blame] | 1863 | mm_segment_t old_fs = get_fs(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1864 | int ret = 0; |
| 1865 | |
| 1866 | /* Must have permission */ |
| 1867 | if (!capable(CAP_SYS_MODULE)) |
| 1868 | return -EPERM; |
| 1869 | |
| 1870 | /* Only one module load at a time, please */ |
| 1871 | if (down_interruptible(&module_mutex) != 0) |
| 1872 | return -EINTR; |
| 1873 | |
| 1874 | /* Do all the hard work */ |
| 1875 | mod = load_module(umod, len, uargs); |
| 1876 | if (IS_ERR(mod)) { |
| 1877 | up(&module_mutex); |
| 1878 | return PTR_ERR(mod); |
| 1879 | } |
| 1880 | |
Roman Zippel | ae92ef8 | 2005-05-31 14:39:29 -0700 | [diff] [blame] | 1881 | /* flush the icache in correct context */ |
| 1882 | set_fs(KERNEL_DS); |
| 1883 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1884 | /* Flush the instruction cache, since we've played with text */ |
| 1885 | if (mod->module_init) |
| 1886 | flush_icache_range((unsigned long)mod->module_init, |
| 1887 | (unsigned long)mod->module_init |
| 1888 | + mod->init_size); |
| 1889 | flush_icache_range((unsigned long)mod->module_core, |
| 1890 | (unsigned long)mod->module_core + mod->core_size); |
| 1891 | |
Roman Zippel | ae92ef8 | 2005-05-31 14:39:29 -0700 | [diff] [blame] | 1892 | set_fs(old_fs); |
| 1893 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1894 | /* Now sew it into the lists. They won't access us, since |
| 1895 | strong_try_module_get() will fail. */ |
| 1896 | stop_machine_run(__link_module, mod, NR_CPUS); |
| 1897 | |
| 1898 | /* Drop lock so they can recurse */ |
| 1899 | up(&module_mutex); |
| 1900 | |
| 1901 | down(¬ify_mutex); |
| 1902 | notifier_call_chain(&module_notify_list, MODULE_STATE_COMING, mod); |
| 1903 | up(¬ify_mutex); |
| 1904 | |
| 1905 | /* Start the module */ |
| 1906 | if (mod->init != NULL) |
| 1907 | ret = mod->init(); |
| 1908 | if (ret < 0) { |
| 1909 | /* Init routine failed: abort. Try to protect us from |
| 1910 | buggy refcounters. */ |
| 1911 | mod->state = MODULE_STATE_GOING; |
Paul E. McKenney | fbd568a3e | 2005-05-01 08:59:04 -0700 | [diff] [blame] | 1912 | synchronize_sched(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1913 | if (mod->unsafe) |
| 1914 | printk(KERN_ERR "%s: module is now stuck!\n", |
| 1915 | mod->name); |
| 1916 | else { |
| 1917 | module_put(mod); |
| 1918 | down(&module_mutex); |
| 1919 | free_module(mod); |
| 1920 | up(&module_mutex); |
| 1921 | } |
| 1922 | return ret; |
| 1923 | } |
| 1924 | |
| 1925 | /* Now it's a first class citizen! */ |
| 1926 | down(&module_mutex); |
| 1927 | mod->state = MODULE_STATE_LIVE; |
| 1928 | /* Drop initial reference. */ |
| 1929 | module_put(mod); |
| 1930 | module_free(mod, mod->module_init); |
| 1931 | mod->module_init = NULL; |
| 1932 | mod->init_size = 0; |
| 1933 | mod->init_text_size = 0; |
| 1934 | up(&module_mutex); |
| 1935 | |
| 1936 | return 0; |
| 1937 | } |
| 1938 | |
| 1939 | static inline int within(unsigned long addr, void *start, unsigned long size) |
| 1940 | { |
| 1941 | return ((void *)addr >= start && (void *)addr < start + size); |
| 1942 | } |
| 1943 | |
| 1944 | #ifdef CONFIG_KALLSYMS |
| 1945 | /* |
| 1946 | * This ignores the intensely annoying "mapping symbols" found |
| 1947 | * in ARM ELF files: $a, $t and $d. |
| 1948 | */ |
| 1949 | static inline int is_arm_mapping_symbol(const char *str) |
| 1950 | { |
| 1951 | return str[0] == '$' && strchr("atd", str[1]) |
| 1952 | && (str[2] == '\0' || str[2] == '.'); |
| 1953 | } |
| 1954 | |
| 1955 | static const char *get_ksymbol(struct module *mod, |
| 1956 | unsigned long addr, |
| 1957 | unsigned long *size, |
| 1958 | unsigned long *offset) |
| 1959 | { |
| 1960 | unsigned int i, best = 0; |
| 1961 | unsigned long nextval; |
| 1962 | |
| 1963 | /* At worse, next value is at end of module */ |
| 1964 | if (within(addr, mod->module_init, mod->init_size)) |
| 1965 | nextval = (unsigned long)mod->module_init+mod->init_text_size; |
| 1966 | else |
| 1967 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
| 1968 | |
| 1969 | /* Scan for closest preceeding symbol, and next symbol. (ELF |
| 1970 | starts real symbols at 1). */ |
| 1971 | for (i = 1; i < mod->num_symtab; i++) { |
| 1972 | if (mod->symtab[i].st_shndx == SHN_UNDEF) |
| 1973 | continue; |
| 1974 | |
| 1975 | /* We ignore unnamed symbols: they're uninformative |
| 1976 | * and inserted at a whim. */ |
| 1977 | if (mod->symtab[i].st_value <= addr |
| 1978 | && mod->symtab[i].st_value > mod->symtab[best].st_value |
| 1979 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' |
| 1980 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) |
| 1981 | best = i; |
| 1982 | if (mod->symtab[i].st_value > addr |
| 1983 | && mod->symtab[i].st_value < nextval |
| 1984 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' |
| 1985 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) |
| 1986 | nextval = mod->symtab[i].st_value; |
| 1987 | } |
| 1988 | |
| 1989 | if (!best) |
| 1990 | return NULL; |
| 1991 | |
| 1992 | *size = nextval - mod->symtab[best].st_value; |
| 1993 | *offset = addr - mod->symtab[best].st_value; |
| 1994 | return mod->strtab + mod->symtab[best].st_name; |
| 1995 | } |
| 1996 | |
| 1997 | /* For kallsyms to ask for address resolution. NULL means not found. |
| 1998 | We don't lock, as this is used for oops resolution and races are a |
| 1999 | lesser concern. */ |
| 2000 | const char *module_address_lookup(unsigned long addr, |
| 2001 | unsigned long *size, |
| 2002 | unsigned long *offset, |
| 2003 | char **modname) |
| 2004 | { |
| 2005 | struct module *mod; |
| 2006 | |
| 2007 | list_for_each_entry(mod, &modules, list) { |
| 2008 | if (within(addr, mod->module_init, mod->init_size) |
| 2009 | || within(addr, mod->module_core, mod->core_size)) { |
| 2010 | *modname = mod->name; |
| 2011 | return get_ksymbol(mod, addr, size, offset); |
| 2012 | } |
| 2013 | } |
| 2014 | return NULL; |
| 2015 | } |
| 2016 | |
| 2017 | struct module *module_get_kallsym(unsigned int symnum, |
| 2018 | unsigned long *value, |
| 2019 | char *type, |
| 2020 | char namebuf[128]) |
| 2021 | { |
| 2022 | struct module *mod; |
| 2023 | |
| 2024 | down(&module_mutex); |
| 2025 | list_for_each_entry(mod, &modules, list) { |
| 2026 | if (symnum < mod->num_symtab) { |
| 2027 | *value = mod->symtab[symnum].st_value; |
| 2028 | *type = mod->symtab[symnum].st_info; |
| 2029 | strncpy(namebuf, |
| 2030 | mod->strtab + mod->symtab[symnum].st_name, |
| 2031 | 127); |
| 2032 | up(&module_mutex); |
| 2033 | return mod; |
| 2034 | } |
| 2035 | symnum -= mod->num_symtab; |
| 2036 | } |
| 2037 | up(&module_mutex); |
| 2038 | return NULL; |
| 2039 | } |
| 2040 | |
| 2041 | static unsigned long mod_find_symname(struct module *mod, const char *name) |
| 2042 | { |
| 2043 | unsigned int i; |
| 2044 | |
| 2045 | for (i = 0; i < mod->num_symtab; i++) |
| 2046 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0) |
| 2047 | return mod->symtab[i].st_value; |
| 2048 | return 0; |
| 2049 | } |
| 2050 | |
| 2051 | /* Look for this name: can be of form module:name. */ |
| 2052 | unsigned long module_kallsyms_lookup_name(const char *name) |
| 2053 | { |
| 2054 | struct module *mod; |
| 2055 | char *colon; |
| 2056 | unsigned long ret = 0; |
| 2057 | |
| 2058 | /* Don't lock: we're in enough trouble already. */ |
| 2059 | if ((colon = strchr(name, ':')) != NULL) { |
| 2060 | *colon = '\0'; |
| 2061 | if ((mod = find_module(name)) != NULL) |
| 2062 | ret = mod_find_symname(mod, colon+1); |
| 2063 | *colon = ':'; |
| 2064 | } else { |
| 2065 | list_for_each_entry(mod, &modules, list) |
| 2066 | if ((ret = mod_find_symname(mod, name)) != 0) |
| 2067 | break; |
| 2068 | } |
| 2069 | return ret; |
| 2070 | } |
| 2071 | #endif /* CONFIG_KALLSYMS */ |
| 2072 | |
| 2073 | /* Called by the /proc file system to return a list of modules. */ |
| 2074 | static void *m_start(struct seq_file *m, loff_t *pos) |
| 2075 | { |
| 2076 | struct list_head *i; |
| 2077 | loff_t n = 0; |
| 2078 | |
| 2079 | down(&module_mutex); |
| 2080 | list_for_each(i, &modules) { |
| 2081 | if (n++ == *pos) |
| 2082 | break; |
| 2083 | } |
| 2084 | if (i == &modules) |
| 2085 | return NULL; |
| 2086 | return i; |
| 2087 | } |
| 2088 | |
| 2089 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) |
| 2090 | { |
| 2091 | struct list_head *i = p; |
| 2092 | (*pos)++; |
| 2093 | if (i->next == &modules) |
| 2094 | return NULL; |
| 2095 | return i->next; |
| 2096 | } |
| 2097 | |
| 2098 | static void m_stop(struct seq_file *m, void *p) |
| 2099 | { |
| 2100 | up(&module_mutex); |
| 2101 | } |
| 2102 | |
| 2103 | static int m_show(struct seq_file *m, void *p) |
| 2104 | { |
| 2105 | struct module *mod = list_entry(p, struct module, list); |
| 2106 | seq_printf(m, "%s %lu", |
| 2107 | mod->name, mod->init_size + mod->core_size); |
| 2108 | print_unload_info(m, mod); |
| 2109 | |
| 2110 | /* Informative for users. */ |
| 2111 | seq_printf(m, " %s", |
| 2112 | mod->state == MODULE_STATE_GOING ? "Unloading": |
| 2113 | mod->state == MODULE_STATE_COMING ? "Loading": |
| 2114 | "Live"); |
| 2115 | /* Used by oprofile and other similar tools. */ |
| 2116 | seq_printf(m, " 0x%p", mod->module_core); |
| 2117 | |
| 2118 | seq_printf(m, "\n"); |
| 2119 | return 0; |
| 2120 | } |
| 2121 | |
| 2122 | /* Format: modulename size refcount deps address |
| 2123 | |
| 2124 | Where refcount is a number or -, and deps is a comma-separated list |
| 2125 | of depends or -. |
| 2126 | */ |
| 2127 | struct seq_operations modules_op = { |
| 2128 | .start = m_start, |
| 2129 | .next = m_next, |
| 2130 | .stop = m_stop, |
| 2131 | .show = m_show |
| 2132 | }; |
| 2133 | |
| 2134 | /* Given an address, look for it in the module exception tables. */ |
| 2135 | const struct exception_table_entry *search_module_extables(unsigned long addr) |
| 2136 | { |
| 2137 | unsigned long flags; |
| 2138 | const struct exception_table_entry *e = NULL; |
| 2139 | struct module *mod; |
| 2140 | |
| 2141 | spin_lock_irqsave(&modlist_lock, flags); |
| 2142 | list_for_each_entry(mod, &modules, list) { |
| 2143 | if (mod->num_exentries == 0) |
| 2144 | continue; |
| 2145 | |
| 2146 | e = search_extable(mod->extable, |
| 2147 | mod->extable + mod->num_exentries - 1, |
| 2148 | addr); |
| 2149 | if (e) |
| 2150 | break; |
| 2151 | } |
| 2152 | spin_unlock_irqrestore(&modlist_lock, flags); |
| 2153 | |
| 2154 | /* Now, if we found one, we are running inside it now, hence |
| 2155 | we cannot unload the module, hence no refcnt needed. */ |
| 2156 | return e; |
| 2157 | } |
| 2158 | |
| 2159 | /* Is this a valid kernel address? We don't grab the lock: we are oopsing. */ |
| 2160 | struct module *__module_text_address(unsigned long addr) |
| 2161 | { |
| 2162 | struct module *mod; |
| 2163 | |
| 2164 | list_for_each_entry(mod, &modules, list) |
| 2165 | if (within(addr, mod->module_init, mod->init_text_size) |
| 2166 | || within(addr, mod->module_core, mod->core_text_size)) |
| 2167 | return mod; |
| 2168 | return NULL; |
| 2169 | } |
| 2170 | |
| 2171 | struct module *module_text_address(unsigned long addr) |
| 2172 | { |
| 2173 | struct module *mod; |
| 2174 | unsigned long flags; |
| 2175 | |
| 2176 | spin_lock_irqsave(&modlist_lock, flags); |
| 2177 | mod = __module_text_address(addr); |
| 2178 | spin_unlock_irqrestore(&modlist_lock, flags); |
| 2179 | |
| 2180 | return mod; |
| 2181 | } |
| 2182 | |
| 2183 | /* Don't grab lock, we're oopsing. */ |
| 2184 | void print_modules(void) |
| 2185 | { |
| 2186 | struct module *mod; |
| 2187 | |
| 2188 | printk("Modules linked in:"); |
| 2189 | list_for_each_entry(mod, &modules, list) |
| 2190 | printk(" %s", mod->name); |
| 2191 | printk("\n"); |
| 2192 | } |
| 2193 | |
| 2194 | void module_add_driver(struct module *mod, struct device_driver *drv) |
| 2195 | { |
| 2196 | if (!mod || !drv) |
| 2197 | return; |
| 2198 | |
| 2199 | /* Don't check return code; this call is idempotent */ |
| 2200 | sysfs_create_link(&drv->kobj, &mod->mkobj.kobj, "module"); |
| 2201 | } |
| 2202 | EXPORT_SYMBOL(module_add_driver); |
| 2203 | |
| 2204 | void module_remove_driver(struct device_driver *drv) |
| 2205 | { |
| 2206 | if (!drv) |
| 2207 | return; |
| 2208 | sysfs_remove_link(&drv->kobj, "module"); |
| 2209 | } |
| 2210 | EXPORT_SYMBOL(module_remove_driver); |
| 2211 | |
| 2212 | #ifdef CONFIG_MODVERSIONS |
| 2213 | /* Generate the signature for struct module here, too, for modversions. */ |
| 2214 | void struct_module(struct module *mod) { return; } |
| 2215 | EXPORT_SYMBOL(struct_module); |
| 2216 | #endif |