Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/module.h> |
| 20 | #include <linux/moduleloader.h> |
| 21 | #include <linux/init.h> |
Randy Dunlap | 9f15833 | 2005-09-13 01:25:16 -0700 | [diff] [blame] | 22 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Randy.Dunlap | c59ede7 | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 30 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <linux/cpu.h> |
| 32 | #include <linux/moduleparam.h> |
| 33 | #include <linux/errno.h> |
| 34 | #include <linux/err.h> |
| 35 | #include <linux/vermagic.h> |
| 36 | #include <linux/notifier.h> |
| 37 | #include <linux/stop_machine.h> |
| 38 | #include <linux/device.h> |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 39 | #include <linux/string.h> |
Tim Schmielau | 8c65b4a | 2005-11-07 00:59:43 -0800 | [diff] [blame] | 40 | #include <linux/sched.h> |
Arjan van de Ven | 97d1f15 | 2006-03-23 03:00:24 -0800 | [diff] [blame] | 41 | #include <linux/mutex.h> |
Jan Beulich | 4552d5d | 2006-06-26 13:57:28 +0200 | [diff] [blame] | 42 | #include <linux/unwind.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <asm/uaccess.h> |
| 44 | #include <asm/semaphore.h> |
| 45 | #include <asm/cacheflush.h> |
Sam Ravnborg | b817f6f | 2006-06-09 21:53:55 +0200 | [diff] [blame] | 46 | #include <linux/license.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
| 48 | #if 0 |
| 49 | #define DEBUGP printk |
| 50 | #else |
| 51 | #define DEBUGP(fmt , a...) |
| 52 | #endif |
| 53 | |
| 54 | #ifndef ARCH_SHF_SMALL |
| 55 | #define ARCH_SHF_SMALL 0 |
| 56 | #endif |
| 57 | |
| 58 | /* If this is set, the section belongs in the init part of the module */ |
| 59 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) |
| 60 | |
| 61 | /* Protects module list */ |
| 62 | static DEFINE_SPINLOCK(modlist_lock); |
| 63 | |
| 64 | /* List of modules, protected by module_mutex AND modlist_lock */ |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 65 | static DEFINE_MUTEX(module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | static LIST_HEAD(modules); |
| 67 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 68 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
| 70 | int register_module_notifier(struct notifier_block * nb) |
| 71 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 72 | return blocking_notifier_chain_register(&module_notify_list, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | } |
| 74 | EXPORT_SYMBOL(register_module_notifier); |
| 75 | |
| 76 | int unregister_module_notifier(struct notifier_block * nb) |
| 77 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 78 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | } |
| 80 | EXPORT_SYMBOL(unregister_module_notifier); |
| 81 | |
| 82 | /* We require a truly strong try_module_get() */ |
| 83 | static inline int strong_try_module_get(struct module *mod) |
| 84 | { |
| 85 | if (mod && mod->state == MODULE_STATE_COMING) |
| 86 | return 0; |
| 87 | return try_module_get(mod); |
| 88 | } |
| 89 | |
| 90 | /* A thread that wants to hold a reference to a module only while it |
| 91 | * is running can call ths to safely exit. |
| 92 | * nfsd and lockd use this. |
| 93 | */ |
| 94 | void __module_put_and_exit(struct module *mod, long code) |
| 95 | { |
| 96 | module_put(mod); |
| 97 | do_exit(code); |
| 98 | } |
| 99 | EXPORT_SYMBOL(__module_put_and_exit); |
| 100 | |
| 101 | /* Find a module section: 0 means not found. */ |
| 102 | static unsigned int find_sec(Elf_Ehdr *hdr, |
| 103 | Elf_Shdr *sechdrs, |
| 104 | const char *secstrings, |
| 105 | const char *name) |
| 106 | { |
| 107 | unsigned int i; |
| 108 | |
| 109 | for (i = 1; i < hdr->e_shnum; i++) |
| 110 | /* Alloc bit cleared means "ignore it." */ |
| 111 | if ((sechdrs[i].sh_flags & SHF_ALLOC) |
| 112 | && strcmp(secstrings+sechdrs[i].sh_name, name) == 0) |
| 113 | return i; |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | /* Provided by the linker */ |
| 118 | extern const struct kernel_symbol __start___ksymtab[]; |
| 119 | extern const struct kernel_symbol __stop___ksymtab[]; |
| 120 | extern const struct kernel_symbol __start___ksymtab_gpl[]; |
| 121 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; |
Greg Kroah-Hartman | 9f28bb7 | 2006-03-20 13:17:13 -0800 | [diff] [blame] | 122 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
| 123 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; |
Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 124 | extern const struct kernel_symbol __start___ksymtab_unused[]; |
| 125 | extern const struct kernel_symbol __stop___ksymtab_unused[]; |
| 126 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; |
| 127 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; |
| 128 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
| 129 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | extern const unsigned long __start___kcrctab[]; |
| 131 | extern const unsigned long __start___kcrctab_gpl[]; |
Greg Kroah-Hartman | 9f28bb7 | 2006-03-20 13:17:13 -0800 | [diff] [blame] | 132 | extern const unsigned long __start___kcrctab_gpl_future[]; |
Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 133 | extern const unsigned long __start___kcrctab_unused[]; |
| 134 | extern const unsigned long __start___kcrctab_unused_gpl[]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | |
| 136 | #ifndef CONFIG_MODVERSIONS |
| 137 | #define symversion(base, idx) NULL |
| 138 | #else |
Andrew Morton | f83ca9f | 2006-03-28 01:56:20 -0800 | [diff] [blame] | 139 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | #endif |
| 141 | |
Sam Ravnborg | 3fd6805 | 2006-02-08 21:16:45 +0100 | [diff] [blame] | 142 | /* lookup symbol in given range of kernel_symbols */ |
| 143 | static const struct kernel_symbol *lookup_symbol(const char *name, |
| 144 | const struct kernel_symbol *start, |
| 145 | const struct kernel_symbol *stop) |
| 146 | { |
| 147 | const struct kernel_symbol *ks = start; |
| 148 | for (; ks < stop; ks++) |
| 149 | if (strcmp(ks->name, name) == 0) |
| 150 | return ks; |
| 151 | return NULL; |
| 152 | } |
| 153 | |
Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 154 | static void printk_unused_warning(const char *name) |
| 155 | { |
| 156 | printk(KERN_WARNING "Symbol %s is marked as UNUSED, " |
| 157 | "however this module is using it.\n", name); |
| 158 | printk(KERN_WARNING "This symbol will go away in the future.\n"); |
| 159 | printk(KERN_WARNING "Please evalute if this is the right api to use, " |
| 160 | "and if it really is, submit a report the linux kernel " |
| 161 | "mailinglist together with submitting your code for " |
| 162 | "inclusion.\n"); |
| 163 | } |
| 164 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | /* Find a symbol, return value, crc and module which owns it */ |
| 166 | static unsigned long __find_symbol(const char *name, |
| 167 | struct module **owner, |
| 168 | const unsigned long **crc, |
| 169 | int gplok) |
| 170 | { |
| 171 | struct module *mod; |
Sam Ravnborg | 3fd6805 | 2006-02-08 21:16:45 +0100 | [diff] [blame] | 172 | const struct kernel_symbol *ks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
| 174 | /* Core kernel first. */ |
| 175 | *owner = NULL; |
Sam Ravnborg | 3fd6805 | 2006-02-08 21:16:45 +0100 | [diff] [blame] | 176 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); |
| 177 | if (ks) { |
| 178 | *crc = symversion(__start___kcrctab, (ks - __start___ksymtab)); |
| 179 | return ks->value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | } |
| 181 | if (gplok) { |
Sam Ravnborg | 3fd6805 | 2006-02-08 21:16:45 +0100 | [diff] [blame] | 182 | ks = lookup_symbol(name, __start___ksymtab_gpl, |
| 183 | __stop___ksymtab_gpl); |
| 184 | if (ks) { |
| 185 | *crc = symversion(__start___kcrctab_gpl, |
| 186 | (ks - __start___ksymtab_gpl)); |
| 187 | return ks->value; |
| 188 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | } |
Greg Kroah-Hartman | 9f28bb7 | 2006-03-20 13:17:13 -0800 | [diff] [blame] | 190 | ks = lookup_symbol(name, __start___ksymtab_gpl_future, |
| 191 | __stop___ksymtab_gpl_future); |
| 192 | if (ks) { |
| 193 | if (!gplok) { |
| 194 | printk(KERN_WARNING "Symbol %s is being used " |
| 195 | "by a non-GPL module, which will not " |
| 196 | "be allowed in the future\n", name); |
| 197 | printk(KERN_WARNING "Please see the file " |
| 198 | "Documentation/feature-removal-schedule.txt " |
| 199 | "in the kernel source tree for more " |
| 200 | "details.\n"); |
| 201 | } |
| 202 | *crc = symversion(__start___kcrctab_gpl_future, |
| 203 | (ks - __start___ksymtab_gpl_future)); |
| 204 | return ks->value; |
| 205 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | |
Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 207 | ks = lookup_symbol(name, __start___ksymtab_unused, |
| 208 | __stop___ksymtab_unused); |
| 209 | if (ks) { |
| 210 | printk_unused_warning(name); |
| 211 | *crc = symversion(__start___kcrctab_unused, |
| 212 | (ks - __start___ksymtab_unused)); |
| 213 | return ks->value; |
| 214 | } |
| 215 | |
| 216 | if (gplok) |
| 217 | ks = lookup_symbol(name, __start___ksymtab_unused_gpl, |
| 218 | __stop___ksymtab_unused_gpl); |
| 219 | if (ks) { |
| 220 | printk_unused_warning(name); |
| 221 | *crc = symversion(__start___kcrctab_unused_gpl, |
| 222 | (ks - __start___ksymtab_unused_gpl)); |
| 223 | return ks->value; |
| 224 | } |
| 225 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | /* Now try modules. */ |
| 227 | list_for_each_entry(mod, &modules, list) { |
| 228 | *owner = mod; |
Sam Ravnborg | 3fd6805 | 2006-02-08 21:16:45 +0100 | [diff] [blame] | 229 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
| 230 | if (ks) { |
| 231 | *crc = symversion(mod->crcs, (ks - mod->syms)); |
| 232 | return ks->value; |
| 233 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | |
| 235 | if (gplok) { |
Sam Ravnborg | 3fd6805 | 2006-02-08 21:16:45 +0100 | [diff] [blame] | 236 | ks = lookup_symbol(name, mod->gpl_syms, |
| 237 | mod->gpl_syms + mod->num_gpl_syms); |
| 238 | if (ks) { |
| 239 | *crc = symversion(mod->gpl_crcs, |
| 240 | (ks - mod->gpl_syms)); |
| 241 | return ks->value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | } |
| 243 | } |
Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 244 | ks = lookup_symbol(name, mod->unused_syms, mod->unused_syms + mod->num_unused_syms); |
| 245 | if (ks) { |
| 246 | printk_unused_warning(name); |
| 247 | *crc = symversion(mod->unused_crcs, (ks - mod->unused_syms)); |
| 248 | return ks->value; |
| 249 | } |
| 250 | |
| 251 | if (gplok) { |
| 252 | ks = lookup_symbol(name, mod->unused_gpl_syms, |
| 253 | mod->unused_gpl_syms + mod->num_unused_gpl_syms); |
| 254 | if (ks) { |
| 255 | printk_unused_warning(name); |
| 256 | *crc = symversion(mod->unused_gpl_crcs, |
| 257 | (ks - mod->unused_gpl_syms)); |
| 258 | return ks->value; |
| 259 | } |
| 260 | } |
Greg Kroah-Hartman | 9f28bb7 | 2006-03-20 13:17:13 -0800 | [diff] [blame] | 261 | ks = lookup_symbol(name, mod->gpl_future_syms, |
| 262 | (mod->gpl_future_syms + |
| 263 | mod->num_gpl_future_syms)); |
| 264 | if (ks) { |
| 265 | if (!gplok) { |
| 266 | printk(KERN_WARNING "Symbol %s is being used " |
| 267 | "by a non-GPL module, which will not " |
| 268 | "be allowed in the future\n", name); |
| 269 | printk(KERN_WARNING "Please see the file " |
| 270 | "Documentation/feature-removal-schedule.txt " |
| 271 | "in the kernel source tree for more " |
| 272 | "details.\n"); |
| 273 | } |
| 274 | *crc = symversion(mod->gpl_future_crcs, |
| 275 | (ks - mod->gpl_future_syms)); |
| 276 | return ks->value; |
| 277 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | } |
| 279 | DEBUGP("Failed to find symbol %s\n", name); |
| 280 | return 0; |
| 281 | } |
| 282 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | /* Search for module by name: must hold module_mutex. */ |
| 284 | static struct module *find_module(const char *name) |
| 285 | { |
| 286 | struct module *mod; |
| 287 | |
| 288 | list_for_each_entry(mod, &modules, list) { |
| 289 | if (strcmp(mod->name, name) == 0) |
| 290 | return mod; |
| 291 | } |
| 292 | return NULL; |
| 293 | } |
| 294 | |
| 295 | #ifdef CONFIG_SMP |
| 296 | /* Number of blocks used and allocated. */ |
| 297 | static unsigned int pcpu_num_used, pcpu_num_allocated; |
| 298 | /* Size of each block. -ve means used. */ |
| 299 | static int *pcpu_size; |
| 300 | |
| 301 | static int split_block(unsigned int i, unsigned short size) |
| 302 | { |
| 303 | /* Reallocation required? */ |
| 304 | if (pcpu_num_used + 1 > pcpu_num_allocated) { |
| 305 | int *new = kmalloc(sizeof(new[0]) * pcpu_num_allocated*2, |
| 306 | GFP_KERNEL); |
| 307 | if (!new) |
| 308 | return 0; |
| 309 | |
| 310 | memcpy(new, pcpu_size, sizeof(new[0])*pcpu_num_allocated); |
| 311 | pcpu_num_allocated *= 2; |
| 312 | kfree(pcpu_size); |
| 313 | pcpu_size = new; |
| 314 | } |
| 315 | |
| 316 | /* Insert a new subblock */ |
| 317 | memmove(&pcpu_size[i+1], &pcpu_size[i], |
| 318 | sizeof(pcpu_size[0]) * (pcpu_num_used - i)); |
| 319 | pcpu_num_used++; |
| 320 | |
| 321 | pcpu_size[i+1] -= size; |
| 322 | pcpu_size[i] = size; |
| 323 | return 1; |
| 324 | } |
| 325 | |
| 326 | static inline unsigned int block_size(int val) |
| 327 | { |
| 328 | if (val < 0) |
| 329 | return -val; |
| 330 | return val; |
| 331 | } |
| 332 | |
| 333 | /* Created by linker magic */ |
| 334 | extern char __per_cpu_start[], __per_cpu_end[]; |
| 335 | |
Rusty Russell | 842bbaa | 2005-08-01 21:11:47 -0700 | [diff] [blame] | 336 | static void *percpu_modalloc(unsigned long size, unsigned long align, |
| 337 | const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | { |
| 339 | unsigned long extra; |
| 340 | unsigned int i; |
| 341 | void *ptr; |
| 342 | |
Rusty Russell | 842bbaa | 2005-08-01 21:11:47 -0700 | [diff] [blame] | 343 | if (align > SMP_CACHE_BYTES) { |
| 344 | printk(KERN_WARNING "%s: per-cpu alignment %li > %i\n", |
| 345 | name, align, SMP_CACHE_BYTES); |
| 346 | align = SMP_CACHE_BYTES; |
| 347 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | |
| 349 | ptr = __per_cpu_start; |
| 350 | for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { |
| 351 | /* Extra for alignment requirement. */ |
| 352 | extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr; |
| 353 | BUG_ON(i == 0 && extra != 0); |
| 354 | |
| 355 | if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size) |
| 356 | continue; |
| 357 | |
| 358 | /* Transfer extra to previous block. */ |
| 359 | if (pcpu_size[i-1] < 0) |
| 360 | pcpu_size[i-1] -= extra; |
| 361 | else |
| 362 | pcpu_size[i-1] += extra; |
| 363 | pcpu_size[i] -= extra; |
| 364 | ptr += extra; |
| 365 | |
| 366 | /* Split block if warranted */ |
| 367 | if (pcpu_size[i] - size > sizeof(unsigned long)) |
| 368 | if (!split_block(i, size)) |
| 369 | return NULL; |
| 370 | |
| 371 | /* Mark allocated */ |
| 372 | pcpu_size[i] = -pcpu_size[i]; |
| 373 | return ptr; |
| 374 | } |
| 375 | |
| 376 | printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n", |
| 377 | size); |
| 378 | return NULL; |
| 379 | } |
| 380 | |
| 381 | static void percpu_modfree(void *freeme) |
| 382 | { |
| 383 | unsigned int i; |
| 384 | void *ptr = __per_cpu_start + block_size(pcpu_size[0]); |
| 385 | |
| 386 | /* First entry is core kernel percpu data. */ |
| 387 | for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { |
| 388 | if (ptr == freeme) { |
| 389 | pcpu_size[i] = -pcpu_size[i]; |
| 390 | goto free; |
| 391 | } |
| 392 | } |
| 393 | BUG(); |
| 394 | |
| 395 | free: |
| 396 | /* Merge with previous? */ |
| 397 | if (pcpu_size[i-1] >= 0) { |
| 398 | pcpu_size[i-1] += pcpu_size[i]; |
| 399 | pcpu_num_used--; |
| 400 | memmove(&pcpu_size[i], &pcpu_size[i+1], |
| 401 | (pcpu_num_used - i) * sizeof(pcpu_size[0])); |
| 402 | i--; |
| 403 | } |
| 404 | /* Merge with next? */ |
| 405 | if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) { |
| 406 | pcpu_size[i] += pcpu_size[i+1]; |
| 407 | pcpu_num_used--; |
| 408 | memmove(&pcpu_size[i+1], &pcpu_size[i+2], |
| 409 | (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0])); |
| 410 | } |
| 411 | } |
| 412 | |
| 413 | static unsigned int find_pcpusec(Elf_Ehdr *hdr, |
| 414 | Elf_Shdr *sechdrs, |
| 415 | const char *secstrings) |
| 416 | { |
| 417 | return find_sec(hdr, sechdrs, secstrings, ".data.percpu"); |
| 418 | } |
| 419 | |
| 420 | static int percpu_modinit(void) |
| 421 | { |
| 422 | pcpu_num_used = 2; |
| 423 | pcpu_num_allocated = 2; |
| 424 | pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated, |
| 425 | GFP_KERNEL); |
| 426 | /* Static in-kernel percpu data (used). */ |
| 427 | pcpu_size[0] = -ALIGN(__per_cpu_end-__per_cpu_start, SMP_CACHE_BYTES); |
| 428 | /* Free room. */ |
| 429 | pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0]; |
| 430 | if (pcpu_size[1] < 0) { |
| 431 | printk(KERN_ERR "No per-cpu room for modules.\n"); |
| 432 | pcpu_num_used = 1; |
| 433 | } |
| 434 | |
| 435 | return 0; |
| 436 | } |
| 437 | __initcall(percpu_modinit); |
| 438 | #else /* ... !CONFIG_SMP */ |
Rusty Russell | 842bbaa | 2005-08-01 21:11:47 -0700 | [diff] [blame] | 439 | static inline void *percpu_modalloc(unsigned long size, unsigned long align, |
| 440 | const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | { |
| 442 | return NULL; |
| 443 | } |
| 444 | static inline void percpu_modfree(void *pcpuptr) |
| 445 | { |
| 446 | BUG(); |
| 447 | } |
| 448 | static inline unsigned int find_pcpusec(Elf_Ehdr *hdr, |
| 449 | Elf_Shdr *sechdrs, |
| 450 | const char *secstrings) |
| 451 | { |
| 452 | return 0; |
| 453 | } |
| 454 | static inline void percpu_modcopy(void *pcpudst, const void *src, |
| 455 | unsigned long size) |
| 456 | { |
| 457 | /* pcpusec should be 0, and size of that section should be 0. */ |
| 458 | BUG_ON(size != 0); |
| 459 | } |
| 460 | #endif /* CONFIG_SMP */ |
| 461 | |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 462 | #define MODINFO_ATTR(field) \ |
| 463 | static void setup_modinfo_##field(struct module *mod, const char *s) \ |
| 464 | { \ |
| 465 | mod->field = kstrdup(s, GFP_KERNEL); \ |
| 466 | } \ |
| 467 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ |
| 468 | struct module *mod, char *buffer) \ |
| 469 | { \ |
| 470 | return sprintf(buffer, "%s\n", mod->field); \ |
| 471 | } \ |
| 472 | static int modinfo_##field##_exists(struct module *mod) \ |
| 473 | { \ |
| 474 | return mod->field != NULL; \ |
| 475 | } \ |
| 476 | static void free_modinfo_##field(struct module *mod) \ |
| 477 | { \ |
| 478 | kfree(mod->field); \ |
| 479 | mod->field = NULL; \ |
| 480 | } \ |
| 481 | static struct module_attribute modinfo_##field = { \ |
| 482 | .attr = { .name = __stringify(field), .mode = 0444, \ |
| 483 | .owner = THIS_MODULE }, \ |
| 484 | .show = show_modinfo_##field, \ |
| 485 | .setup = setup_modinfo_##field, \ |
| 486 | .test = modinfo_##field##_exists, \ |
| 487 | .free = free_modinfo_##field, \ |
| 488 | }; |
| 489 | |
| 490 | MODINFO_ATTR(version); |
| 491 | MODINFO_ATTR(srcversion); |
| 492 | |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 493 | #ifdef CONFIG_MODULE_UNLOAD |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | /* Init the unload section of the module. */ |
| 495 | static void module_unload_init(struct module *mod) |
| 496 | { |
| 497 | unsigned int i; |
| 498 | |
| 499 | INIT_LIST_HEAD(&mod->modules_which_use_me); |
| 500 | for (i = 0; i < NR_CPUS; i++) |
| 501 | local_set(&mod->ref[i].count, 0); |
| 502 | /* Hold reference count during initialization. */ |
Ingo Molnar | 39c715b | 2005-06-21 17:14:34 -0700 | [diff] [blame] | 503 | local_set(&mod->ref[raw_smp_processor_id()].count, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | /* Backwards compatibility macros put refcount during init. */ |
| 505 | mod->waiter = current; |
| 506 | } |
| 507 | |
| 508 | /* modules using other modules */ |
| 509 | struct module_use |
| 510 | { |
| 511 | struct list_head list; |
| 512 | struct module *module_which_uses; |
| 513 | }; |
| 514 | |
| 515 | /* Does a already use b? */ |
| 516 | static int already_uses(struct module *a, struct module *b) |
| 517 | { |
| 518 | struct module_use *use; |
| 519 | |
| 520 | list_for_each_entry(use, &b->modules_which_use_me, list) { |
| 521 | if (use->module_which_uses == a) { |
| 522 | DEBUGP("%s uses %s!\n", a->name, b->name); |
| 523 | return 1; |
| 524 | } |
| 525 | } |
| 526 | DEBUGP("%s does not use %s!\n", a->name, b->name); |
| 527 | return 0; |
| 528 | } |
| 529 | |
| 530 | /* Module a uses b */ |
| 531 | static int use_module(struct module *a, struct module *b) |
| 532 | { |
| 533 | struct module_use *use; |
| 534 | if (b == NULL || already_uses(a, b)) return 1; |
| 535 | |
| 536 | if (!strong_try_module_get(b)) |
| 537 | return 0; |
| 538 | |
| 539 | DEBUGP("Allocating new usage for %s.\n", a->name); |
| 540 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
| 541 | if (!use) { |
| 542 | printk("%s: out of memory loading\n", a->name); |
| 543 | module_put(b); |
| 544 | return 0; |
| 545 | } |
| 546 | |
| 547 | use->module_which_uses = a; |
| 548 | list_add(&use->list, &b->modules_which_use_me); |
| 549 | return 1; |
| 550 | } |
| 551 | |
| 552 | /* Clear the unload stuff of the module. */ |
| 553 | static void module_unload_free(struct module *mod) |
| 554 | { |
| 555 | struct module *i; |
| 556 | |
| 557 | list_for_each_entry(i, &modules, list) { |
| 558 | struct module_use *use; |
| 559 | |
| 560 | list_for_each_entry(use, &i->modules_which_use_me, list) { |
| 561 | if (use->module_which_uses == mod) { |
| 562 | DEBUGP("%s unusing %s\n", mod->name, i->name); |
| 563 | module_put(i); |
| 564 | list_del(&use->list); |
| 565 | kfree(use); |
| 566 | /* There can be at most one match. */ |
| 567 | break; |
| 568 | } |
| 569 | } |
| 570 | } |
| 571 | } |
| 572 | |
| 573 | #ifdef CONFIG_MODULE_FORCE_UNLOAD |
Akinobu Mita | fb16979 | 2006-01-08 01:04:29 -0800 | [diff] [blame] | 574 | static inline int try_force_unload(unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | { |
| 576 | int ret = (flags & O_TRUNC); |
| 577 | if (ret) |
Akinobu Mita | fb16979 | 2006-01-08 01:04:29 -0800 | [diff] [blame] | 578 | add_taint(TAINT_FORCED_RMMOD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | return ret; |
| 580 | } |
| 581 | #else |
Akinobu Mita | fb16979 | 2006-01-08 01:04:29 -0800 | [diff] [blame] | 582 | static inline int try_force_unload(unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | { |
| 584 | return 0; |
| 585 | } |
| 586 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ |
| 587 | |
| 588 | struct stopref |
| 589 | { |
| 590 | struct module *mod; |
| 591 | int flags; |
| 592 | int *forced; |
| 593 | }; |
| 594 | |
| 595 | /* Whole machine is stopped with interrupts off when this runs. */ |
| 596 | static int __try_stop_module(void *_sref) |
| 597 | { |
| 598 | struct stopref *sref = _sref; |
| 599 | |
| 600 | /* If it's not unused, quit unless we are told to block. */ |
| 601 | if ((sref->flags & O_NONBLOCK) && module_refcount(sref->mod) != 0) { |
Akinobu Mita | fb16979 | 2006-01-08 01:04:29 -0800 | [diff] [blame] | 602 | if (!(*sref->forced = try_force_unload(sref->flags))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | return -EWOULDBLOCK; |
| 604 | } |
| 605 | |
| 606 | /* Mark it as dying. */ |
| 607 | sref->mod->state = MODULE_STATE_GOING; |
| 608 | return 0; |
| 609 | } |
| 610 | |
| 611 | static int try_stop_module(struct module *mod, int flags, int *forced) |
| 612 | { |
| 613 | struct stopref sref = { mod, flags, forced }; |
| 614 | |
| 615 | return stop_machine_run(__try_stop_module, &sref, NR_CPUS); |
| 616 | } |
| 617 | |
| 618 | unsigned int module_refcount(struct module *mod) |
| 619 | { |
| 620 | unsigned int i, total = 0; |
| 621 | |
| 622 | for (i = 0; i < NR_CPUS; i++) |
| 623 | total += local_read(&mod->ref[i].count); |
| 624 | return total; |
| 625 | } |
| 626 | EXPORT_SYMBOL(module_refcount); |
| 627 | |
| 628 | /* This exists whether we can unload or not */ |
| 629 | static void free_module(struct module *mod); |
| 630 | |
| 631 | static void wait_for_zero_refcount(struct module *mod) |
| 632 | { |
| 633 | /* Since we might sleep for some time, drop the semaphore first */ |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 634 | mutex_unlock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | for (;;) { |
| 636 | DEBUGP("Looking at refcount...\n"); |
| 637 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 638 | if (module_refcount(mod) == 0) |
| 639 | break; |
| 640 | schedule(); |
| 641 | } |
| 642 | current->state = TASK_RUNNING; |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 643 | mutex_lock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | } |
| 645 | |
| 646 | asmlinkage long |
| 647 | sys_delete_module(const char __user *name_user, unsigned int flags) |
| 648 | { |
| 649 | struct module *mod; |
| 650 | char name[MODULE_NAME_LEN]; |
| 651 | int ret, forced = 0; |
| 652 | |
| 653 | if (!capable(CAP_SYS_MODULE)) |
| 654 | return -EPERM; |
| 655 | |
| 656 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) |
| 657 | return -EFAULT; |
| 658 | name[MODULE_NAME_LEN-1] = '\0'; |
| 659 | |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 660 | if (mutex_lock_interruptible(&module_mutex) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | return -EINTR; |
| 662 | |
| 663 | mod = find_module(name); |
| 664 | if (!mod) { |
| 665 | ret = -ENOENT; |
| 666 | goto out; |
| 667 | } |
| 668 | |
| 669 | if (!list_empty(&mod->modules_which_use_me)) { |
| 670 | /* Other modules depend on us: get rid of them first. */ |
| 671 | ret = -EWOULDBLOCK; |
| 672 | goto out; |
| 673 | } |
| 674 | |
| 675 | /* Doing init or already dying? */ |
| 676 | if (mod->state != MODULE_STATE_LIVE) { |
| 677 | /* FIXME: if (force), slam module count and wake up |
| 678 | waiter --RR */ |
| 679 | DEBUGP("%s already dying\n", mod->name); |
| 680 | ret = -EBUSY; |
| 681 | goto out; |
| 682 | } |
| 683 | |
| 684 | /* If it has an init func, it must have an exit func to unload */ |
| 685 | if ((mod->init != NULL && mod->exit == NULL) |
| 686 | || mod->unsafe) { |
Akinobu Mita | fb16979 | 2006-01-08 01:04:29 -0800 | [diff] [blame] | 687 | forced = try_force_unload(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | if (!forced) { |
| 689 | /* This module can't be removed */ |
| 690 | ret = -EBUSY; |
| 691 | goto out; |
| 692 | } |
| 693 | } |
| 694 | |
| 695 | /* Set this up before setting mod->state */ |
| 696 | mod->waiter = current; |
| 697 | |
| 698 | /* Stop the machine so refcounts can't move and disable module. */ |
| 699 | ret = try_stop_module(mod, flags, &forced); |
| 700 | if (ret != 0) |
| 701 | goto out; |
| 702 | |
| 703 | /* Never wait if forced. */ |
| 704 | if (!forced && module_refcount(mod) != 0) |
| 705 | wait_for_zero_refcount(mod); |
| 706 | |
| 707 | /* Final destruction now noone is using it. */ |
| 708 | if (mod->exit != NULL) { |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 709 | mutex_unlock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | mod->exit(); |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 711 | mutex_lock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | } |
| 713 | free_module(mod); |
| 714 | |
| 715 | out: |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 716 | mutex_unlock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | return ret; |
| 718 | } |
| 719 | |
| 720 | static void print_unload_info(struct seq_file *m, struct module *mod) |
| 721 | { |
| 722 | struct module_use *use; |
| 723 | int printed_something = 0; |
| 724 | |
| 725 | seq_printf(m, " %u ", module_refcount(mod)); |
| 726 | |
| 727 | /* Always include a trailing , so userspace can differentiate |
| 728 | between this and the old multi-field proc format. */ |
| 729 | list_for_each_entry(use, &mod->modules_which_use_me, list) { |
| 730 | printed_something = 1; |
| 731 | seq_printf(m, "%s,", use->module_which_uses->name); |
| 732 | } |
| 733 | |
| 734 | if (mod->unsafe) { |
| 735 | printed_something = 1; |
| 736 | seq_printf(m, "[unsafe],"); |
| 737 | } |
| 738 | |
| 739 | if (mod->init != NULL && mod->exit == NULL) { |
| 740 | printed_something = 1; |
| 741 | seq_printf(m, "[permanent],"); |
| 742 | } |
| 743 | |
| 744 | if (!printed_something) |
| 745 | seq_printf(m, "-"); |
| 746 | } |
| 747 | |
| 748 | void __symbol_put(const char *symbol) |
| 749 | { |
| 750 | struct module *owner; |
| 751 | unsigned long flags; |
| 752 | const unsigned long *crc; |
| 753 | |
| 754 | spin_lock_irqsave(&modlist_lock, flags); |
| 755 | if (!__find_symbol(symbol, &owner, &crc, 1)) |
| 756 | BUG(); |
| 757 | module_put(owner); |
| 758 | spin_unlock_irqrestore(&modlist_lock, flags); |
| 759 | } |
| 760 | EXPORT_SYMBOL(__symbol_put); |
| 761 | |
| 762 | void symbol_put_addr(void *addr) |
| 763 | { |
Trent Piepho | 5e37661 | 2006-05-15 09:44:06 -0700 | [diff] [blame] | 764 | struct module *modaddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | |
Trent Piepho | 5e37661 | 2006-05-15 09:44:06 -0700 | [diff] [blame] | 766 | if (core_kernel_text((unsigned long)addr)) |
| 767 | return; |
| 768 | |
| 769 | if (!(modaddr = module_text_address((unsigned long)addr))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | BUG(); |
Trent Piepho | 5e37661 | 2006-05-15 09:44:06 -0700 | [diff] [blame] | 771 | module_put(modaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | } |
| 773 | EXPORT_SYMBOL_GPL(symbol_put_addr); |
| 774 | |
| 775 | static ssize_t show_refcnt(struct module_attribute *mattr, |
| 776 | struct module *mod, char *buffer) |
| 777 | { |
| 778 | /* sysfs holds a reference */ |
| 779 | return sprintf(buffer, "%u\n", module_refcount(mod)-1); |
| 780 | } |
| 781 | |
| 782 | static struct module_attribute refcnt = { |
| 783 | .attr = { .name = "refcnt", .mode = 0444, .owner = THIS_MODULE }, |
| 784 | .show = show_refcnt, |
| 785 | }; |
| 786 | |
| 787 | #else /* !CONFIG_MODULE_UNLOAD */ |
| 788 | static void print_unload_info(struct seq_file *m, struct module *mod) |
| 789 | { |
| 790 | /* We don't know the usage count, or what modules are using. */ |
| 791 | seq_printf(m, " - -"); |
| 792 | } |
| 793 | |
| 794 | static inline void module_unload_free(struct module *mod) |
| 795 | { |
| 796 | } |
| 797 | |
| 798 | static inline int use_module(struct module *a, struct module *b) |
| 799 | { |
| 800 | return strong_try_module_get(b); |
| 801 | } |
| 802 | |
| 803 | static inline void module_unload_init(struct module *mod) |
| 804 | { |
| 805 | } |
| 806 | #endif /* CONFIG_MODULE_UNLOAD */ |
| 807 | |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 808 | static struct module_attribute *modinfo_attrs[] = { |
| 809 | &modinfo_version, |
| 810 | &modinfo_srcversion, |
| 811 | #ifdef CONFIG_MODULE_UNLOAD |
| 812 | &refcnt, |
| 813 | #endif |
| 814 | NULL, |
| 815 | }; |
| 816 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | static const char vermagic[] = VERMAGIC_STRING; |
| 818 | |
| 819 | #ifdef CONFIG_MODVERSIONS |
| 820 | static int check_version(Elf_Shdr *sechdrs, |
| 821 | unsigned int versindex, |
| 822 | const char *symname, |
| 823 | struct module *mod, |
| 824 | const unsigned long *crc) |
| 825 | { |
| 826 | unsigned int i, num_versions; |
| 827 | struct modversion_info *versions; |
| 828 | |
| 829 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ |
| 830 | if (!crc) |
| 831 | return 1; |
| 832 | |
| 833 | versions = (void *) sechdrs[versindex].sh_addr; |
| 834 | num_versions = sechdrs[versindex].sh_size |
| 835 | / sizeof(struct modversion_info); |
| 836 | |
| 837 | for (i = 0; i < num_versions; i++) { |
| 838 | if (strcmp(versions[i].name, symname) != 0) |
| 839 | continue; |
| 840 | |
| 841 | if (versions[i].crc == *crc) |
| 842 | return 1; |
| 843 | printk("%s: disagrees about version of symbol %s\n", |
| 844 | mod->name, symname); |
| 845 | DEBUGP("Found checksum %lX vs module %lX\n", |
| 846 | *crc, versions[i].crc); |
| 847 | return 0; |
| 848 | } |
| 849 | /* Not in module's version table. OK, but that taints the kernel. */ |
| 850 | if (!(tainted & TAINT_FORCED_MODULE)) { |
| 851 | printk("%s: no version for \"%s\" found: kernel tainted.\n", |
| 852 | mod->name, symname); |
Randy Dunlap | 9f15833 | 2005-09-13 01:25:16 -0700 | [diff] [blame] | 853 | add_taint(TAINT_FORCED_MODULE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | } |
| 855 | return 1; |
| 856 | } |
| 857 | |
| 858 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, |
| 859 | unsigned int versindex, |
| 860 | struct module *mod) |
| 861 | { |
| 862 | const unsigned long *crc; |
| 863 | struct module *owner; |
| 864 | |
| 865 | if (!__find_symbol("struct_module", &owner, &crc, 1)) |
| 866 | BUG(); |
| 867 | return check_version(sechdrs, versindex, "struct_module", mod, |
| 868 | crc); |
| 869 | } |
| 870 | |
| 871 | /* First part is kernel version, which we ignore. */ |
| 872 | static inline int same_magic(const char *amagic, const char *bmagic) |
| 873 | { |
| 874 | amagic += strcspn(amagic, " "); |
| 875 | bmagic += strcspn(bmagic, " "); |
| 876 | return strcmp(amagic, bmagic) == 0; |
| 877 | } |
| 878 | #else |
| 879 | static inline int check_version(Elf_Shdr *sechdrs, |
| 880 | unsigned int versindex, |
| 881 | const char *symname, |
| 882 | struct module *mod, |
| 883 | const unsigned long *crc) |
| 884 | { |
| 885 | return 1; |
| 886 | } |
| 887 | |
| 888 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, |
| 889 | unsigned int versindex, |
| 890 | struct module *mod) |
| 891 | { |
| 892 | return 1; |
| 893 | } |
| 894 | |
| 895 | static inline int same_magic(const char *amagic, const char *bmagic) |
| 896 | { |
| 897 | return strcmp(amagic, bmagic) == 0; |
| 898 | } |
| 899 | #endif /* CONFIG_MODVERSIONS */ |
| 900 | |
| 901 | /* Resolve a symbol for this module. I.e. if we find one, record usage. |
| 902 | Must be holding module_mutex. */ |
| 903 | static unsigned long resolve_symbol(Elf_Shdr *sechdrs, |
| 904 | unsigned int versindex, |
| 905 | const char *name, |
| 906 | struct module *mod) |
| 907 | { |
| 908 | struct module *owner; |
| 909 | unsigned long ret; |
| 910 | const unsigned long *crc; |
| 911 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | ret = __find_symbol(name, &owner, &crc, mod->license_gplok); |
| 913 | if (ret) { |
| 914 | /* use_module can fail due to OOM, or module unloading */ |
| 915 | if (!check_version(sechdrs, versindex, name, mod, crc) || |
| 916 | !use_module(mod, owner)) |
| 917 | ret = 0; |
| 918 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | return ret; |
| 920 | } |
| 921 | |
| 922 | |
| 923 | /* |
| 924 | * /sys/module/foo/sections stuff |
| 925 | * J. Corbet <corbet@lwn.net> |
| 926 | */ |
| 927 | #ifdef CONFIG_KALLSYMS |
| 928 | static ssize_t module_sect_show(struct module_attribute *mattr, |
| 929 | struct module *mod, char *buf) |
| 930 | { |
| 931 | struct module_sect_attr *sattr = |
| 932 | container_of(mattr, struct module_sect_attr, mattr); |
| 933 | return sprintf(buf, "0x%lx\n", sattr->address); |
| 934 | } |
| 935 | |
| 936 | static void add_sect_attrs(struct module *mod, unsigned int nsect, |
| 937 | char *secstrings, Elf_Shdr *sechdrs) |
| 938 | { |
| 939 | unsigned int nloaded = 0, i, size[2]; |
| 940 | struct module_sect_attrs *sect_attrs; |
| 941 | struct module_sect_attr *sattr; |
| 942 | struct attribute **gattr; |
| 943 | |
| 944 | /* Count loaded sections and allocate structures */ |
| 945 | for (i = 0; i < nsect; i++) |
| 946 | if (sechdrs[i].sh_flags & SHF_ALLOC) |
| 947 | nloaded++; |
| 948 | size[0] = ALIGN(sizeof(*sect_attrs) |
| 949 | + nloaded * sizeof(sect_attrs->attrs[0]), |
| 950 | sizeof(sect_attrs->grp.attrs[0])); |
| 951 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); |
| 952 | if (! (sect_attrs = kmalloc(size[0] + size[1], GFP_KERNEL))) |
| 953 | return; |
| 954 | |
| 955 | /* Setup section attributes. */ |
| 956 | sect_attrs->grp.name = "sections"; |
| 957 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; |
| 958 | |
| 959 | sattr = §_attrs->attrs[0]; |
| 960 | gattr = §_attrs->grp.attrs[0]; |
| 961 | for (i = 0; i < nsect; i++) { |
| 962 | if (! (sechdrs[i].sh_flags & SHF_ALLOC)) |
| 963 | continue; |
| 964 | sattr->address = sechdrs[i].sh_addr; |
| 965 | strlcpy(sattr->name, secstrings + sechdrs[i].sh_name, |
| 966 | MODULE_SECT_NAME_LEN); |
| 967 | sattr->mattr.show = module_sect_show; |
| 968 | sattr->mattr.store = NULL; |
| 969 | sattr->mattr.attr.name = sattr->name; |
| 970 | sattr->mattr.attr.owner = mod; |
| 971 | sattr->mattr.attr.mode = S_IRUGO; |
| 972 | *(gattr++) = &(sattr++)->mattr.attr; |
| 973 | } |
| 974 | *gattr = NULL; |
| 975 | |
| 976 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) |
| 977 | goto out; |
| 978 | |
| 979 | mod->sect_attrs = sect_attrs; |
| 980 | return; |
| 981 | out: |
| 982 | kfree(sect_attrs); |
| 983 | } |
| 984 | |
| 985 | static void remove_sect_attrs(struct module *mod) |
| 986 | { |
| 987 | if (mod->sect_attrs) { |
| 988 | sysfs_remove_group(&mod->mkobj.kobj, |
| 989 | &mod->sect_attrs->grp); |
| 990 | /* We are positive that no one is using any sect attrs |
| 991 | * at this point. Deallocate immediately. */ |
| 992 | kfree(mod->sect_attrs); |
| 993 | mod->sect_attrs = NULL; |
| 994 | } |
| 995 | } |
| 996 | |
| 997 | |
| 998 | #else |
| 999 | static inline void add_sect_attrs(struct module *mod, unsigned int nsect, |
| 1000 | char *sectstrings, Elf_Shdr *sechdrs) |
| 1001 | { |
| 1002 | } |
| 1003 | |
| 1004 | static inline void remove_sect_attrs(struct module *mod) |
| 1005 | { |
| 1006 | } |
| 1007 | #endif /* CONFIG_KALLSYMS */ |
| 1008 | |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1009 | static int module_add_modinfo_attrs(struct module *mod) |
| 1010 | { |
| 1011 | struct module_attribute *attr; |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1012 | struct module_attribute *temp_attr; |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1013 | int error = 0; |
| 1014 | int i; |
| 1015 | |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1016 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
| 1017 | (ARRAY_SIZE(modinfo_attrs) + 1)), |
| 1018 | GFP_KERNEL); |
| 1019 | if (!mod->modinfo_attrs) |
| 1020 | return -ENOMEM; |
| 1021 | |
| 1022 | temp_attr = mod->modinfo_attrs; |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1023 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
| 1024 | if (!attr->test || |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1025 | (attr->test && attr->test(mod))) { |
| 1026 | memcpy(temp_attr, attr, sizeof(*temp_attr)); |
| 1027 | temp_attr->attr.owner = mod; |
| 1028 | error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); |
| 1029 | ++temp_attr; |
| 1030 | } |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1031 | } |
| 1032 | return error; |
| 1033 | } |
| 1034 | |
| 1035 | static void module_remove_modinfo_attrs(struct module *mod) |
| 1036 | { |
| 1037 | struct module_attribute *attr; |
| 1038 | int i; |
| 1039 | |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1040 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
| 1041 | /* pick a field to test for end of list */ |
| 1042 | if (!attr->attr.name) |
| 1043 | break; |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1044 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1045 | if (attr->free) |
| 1046 | attr->free(mod); |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1047 | } |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1048 | kfree(mod->modinfo_attrs); |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1049 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | |
| 1051 | static int mod_sysfs_setup(struct module *mod, |
| 1052 | struct kernel_param *kparam, |
| 1053 | unsigned int num_params) |
| 1054 | { |
| 1055 | int err; |
| 1056 | |
Ed Swierk | 1cc5f71 | 2006-09-25 16:25:36 -0700 | [diff] [blame] | 1057 | if (!module_subsys.kset.subsys) { |
| 1058 | printk(KERN_ERR "%s: module_subsys not initialized\n", |
| 1059 | mod->name); |
| 1060 | err = -EINVAL; |
| 1061 | goto out; |
| 1062 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
| 1064 | err = kobject_set_name(&mod->mkobj.kobj, "%s", mod->name); |
| 1065 | if (err) |
| 1066 | goto out; |
| 1067 | kobj_set_kset_s(&mod->mkobj, module_subsys); |
| 1068 | mod->mkobj.mod = mod; |
| 1069 | err = kobject_register(&mod->mkobj.kobj); |
| 1070 | if (err) |
| 1071 | goto out; |
| 1072 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | err = module_param_sysfs_setup(mod, kparam, num_params); |
| 1074 | if (err) |
| 1075 | goto out_unreg; |
| 1076 | |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1077 | err = module_add_modinfo_attrs(mod); |
| 1078 | if (err) |
| 1079 | goto out_unreg; |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1080 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | return 0; |
| 1082 | |
| 1083 | out_unreg: |
| 1084 | kobject_unregister(&mod->mkobj.kobj); |
| 1085 | out: |
| 1086 | return err; |
| 1087 | } |
| 1088 | |
| 1089 | static void mod_kobject_remove(struct module *mod) |
| 1090 | { |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1091 | module_remove_modinfo_attrs(mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | module_param_sysfs_remove(mod); |
| 1093 | |
| 1094 | kobject_unregister(&mod->mkobj.kobj); |
| 1095 | } |
| 1096 | |
| 1097 | /* |
| 1098 | * unlink the module with the whole machine is stopped with interrupts off |
| 1099 | * - this defends against kallsyms not taking locks |
| 1100 | */ |
| 1101 | static int __unlink_module(void *_mod) |
| 1102 | { |
| 1103 | struct module *mod = _mod; |
| 1104 | list_del(&mod->list); |
| 1105 | return 0; |
| 1106 | } |
| 1107 | |
| 1108 | /* Free a module, remove from lists, etc (must hold module mutex). */ |
| 1109 | static void free_module(struct module *mod) |
| 1110 | { |
| 1111 | /* Delete from various lists */ |
| 1112 | stop_machine_run(__unlink_module, mod, NR_CPUS); |
| 1113 | remove_sect_attrs(mod); |
| 1114 | mod_kobject_remove(mod); |
| 1115 | |
Jan Beulich | 4552d5d | 2006-06-26 13:57:28 +0200 | [diff] [blame] | 1116 | unwind_remove_table(mod->unwind_info, 0); |
| 1117 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | /* Arch-specific cleanup. */ |
| 1119 | module_arch_cleanup(mod); |
| 1120 | |
| 1121 | /* Module unload stuff */ |
| 1122 | module_unload_free(mod); |
| 1123 | |
| 1124 | /* This may be NULL, but that's OK */ |
| 1125 | module_free(mod, mod->module_init); |
| 1126 | kfree(mod->args); |
| 1127 | if (mod->percpu) |
| 1128 | percpu_modfree(mod->percpu); |
| 1129 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 1130 | /* Free lock-classes: */ |
| 1131 | lockdep_free_key_range(mod->module_core, mod->core_size); |
| 1132 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | /* Finally, free the core (containing the module structure) */ |
| 1134 | module_free(mod, mod->module_core); |
| 1135 | } |
| 1136 | |
| 1137 | void *__symbol_get(const char *symbol) |
| 1138 | { |
| 1139 | struct module *owner; |
| 1140 | unsigned long value, flags; |
| 1141 | const unsigned long *crc; |
| 1142 | |
| 1143 | spin_lock_irqsave(&modlist_lock, flags); |
| 1144 | value = __find_symbol(symbol, &owner, &crc, 1); |
| 1145 | if (value && !strong_try_module_get(owner)) |
| 1146 | value = 0; |
| 1147 | spin_unlock_irqrestore(&modlist_lock, flags); |
| 1148 | |
| 1149 | return (void *)value; |
| 1150 | } |
| 1151 | EXPORT_SYMBOL_GPL(__symbol_get); |
| 1152 | |
Ashutosh Naik | eea8b54 | 2006-01-08 01:04:25 -0800 | [diff] [blame] | 1153 | /* |
| 1154 | * Ensure that an exported symbol [global namespace] does not already exist |
| 1155 | * in the Kernel or in some other modules exported symbol table. |
| 1156 | */ |
| 1157 | static int verify_export_symbols(struct module *mod) |
| 1158 | { |
| 1159 | const char *name = NULL; |
| 1160 | unsigned long i, ret = 0; |
| 1161 | struct module *owner; |
| 1162 | const unsigned long *crc; |
| 1163 | |
| 1164 | for (i = 0; i < mod->num_syms; i++) |
| 1165 | if (__find_symbol(mod->syms[i].name, &owner, &crc, 1)) { |
| 1166 | name = mod->syms[i].name; |
| 1167 | ret = -ENOEXEC; |
| 1168 | goto dup; |
| 1169 | } |
| 1170 | |
| 1171 | for (i = 0; i < mod->num_gpl_syms; i++) |
| 1172 | if (__find_symbol(mod->gpl_syms[i].name, &owner, &crc, 1)) { |
| 1173 | name = mod->gpl_syms[i].name; |
| 1174 | ret = -ENOEXEC; |
| 1175 | goto dup; |
| 1176 | } |
| 1177 | |
| 1178 | dup: |
| 1179 | if (ret) |
| 1180 | printk(KERN_ERR "%s: exports duplicate symbol %s (owned by %s)\n", |
| 1181 | mod->name, name, module_name(owner)); |
| 1182 | |
| 1183 | return ret; |
| 1184 | } |
| 1185 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | /* Change all symbols so that sh_value encodes the pointer directly. */ |
| 1187 | static int simplify_symbols(Elf_Shdr *sechdrs, |
| 1188 | unsigned int symindex, |
| 1189 | const char *strtab, |
| 1190 | unsigned int versindex, |
| 1191 | unsigned int pcpuindex, |
| 1192 | struct module *mod) |
| 1193 | { |
| 1194 | Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; |
| 1195 | unsigned long secbase; |
| 1196 | unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); |
| 1197 | int ret = 0; |
| 1198 | |
| 1199 | for (i = 1; i < n; i++) { |
| 1200 | switch (sym[i].st_shndx) { |
| 1201 | case SHN_COMMON: |
| 1202 | /* We compiled with -fno-common. These are not |
| 1203 | supposed to happen. */ |
| 1204 | DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name); |
| 1205 | printk("%s: please compile with -fno-common\n", |
| 1206 | mod->name); |
| 1207 | ret = -ENOEXEC; |
| 1208 | break; |
| 1209 | |
| 1210 | case SHN_ABS: |
| 1211 | /* Don't need to do anything */ |
| 1212 | DEBUGP("Absolute symbol: 0x%08lx\n", |
| 1213 | (long)sym[i].st_value); |
| 1214 | break; |
| 1215 | |
| 1216 | case SHN_UNDEF: |
| 1217 | sym[i].st_value |
| 1218 | = resolve_symbol(sechdrs, versindex, |
| 1219 | strtab + sym[i].st_name, mod); |
| 1220 | |
| 1221 | /* Ok if resolved. */ |
| 1222 | if (sym[i].st_value != 0) |
| 1223 | break; |
| 1224 | /* Ok if weak. */ |
| 1225 | if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
| 1226 | break; |
| 1227 | |
| 1228 | printk(KERN_WARNING "%s: Unknown symbol %s\n", |
| 1229 | mod->name, strtab + sym[i].st_name); |
| 1230 | ret = -ENOENT; |
| 1231 | break; |
| 1232 | |
| 1233 | default: |
| 1234 | /* Divert to percpu allocation if a percpu var. */ |
| 1235 | if (sym[i].st_shndx == pcpuindex) |
| 1236 | secbase = (unsigned long)mod->percpu; |
| 1237 | else |
| 1238 | secbase = sechdrs[sym[i].st_shndx].sh_addr; |
| 1239 | sym[i].st_value += secbase; |
| 1240 | break; |
| 1241 | } |
| 1242 | } |
| 1243 | |
| 1244 | return ret; |
| 1245 | } |
| 1246 | |
| 1247 | /* Update size with this section: return offset. */ |
| 1248 | static long get_offset(unsigned long *size, Elf_Shdr *sechdr) |
| 1249 | { |
| 1250 | long ret; |
| 1251 | |
| 1252 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
| 1253 | *size = ret + sechdr->sh_size; |
| 1254 | return ret; |
| 1255 | } |
| 1256 | |
| 1257 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld |
| 1258 | might -- code, read-only data, read-write data, small data. Tally |
| 1259 | sizes, and place the offsets into sh_entsize fields: high bit means it |
| 1260 | belongs in init. */ |
| 1261 | static void layout_sections(struct module *mod, |
| 1262 | const Elf_Ehdr *hdr, |
| 1263 | Elf_Shdr *sechdrs, |
| 1264 | const char *secstrings) |
| 1265 | { |
| 1266 | static unsigned long const masks[][2] = { |
| 1267 | /* NOTE: all executable code must be the first section |
| 1268 | * in this array; otherwise modify the text_size |
| 1269 | * finder in the two loops below */ |
| 1270 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, |
| 1271 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, |
| 1272 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
| 1273 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } |
| 1274 | }; |
| 1275 | unsigned int m, i; |
| 1276 | |
| 1277 | for (i = 0; i < hdr->e_shnum; i++) |
| 1278 | sechdrs[i].sh_entsize = ~0UL; |
| 1279 | |
| 1280 | DEBUGP("Core section allocation order:\n"); |
| 1281 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
| 1282 | for (i = 0; i < hdr->e_shnum; ++i) { |
| 1283 | Elf_Shdr *s = &sechdrs[i]; |
| 1284 | |
| 1285 | if ((s->sh_flags & masks[m][0]) != masks[m][0] |
| 1286 | || (s->sh_flags & masks[m][1]) |
| 1287 | || s->sh_entsize != ~0UL |
| 1288 | || strncmp(secstrings + s->sh_name, |
| 1289 | ".init", 5) == 0) |
| 1290 | continue; |
| 1291 | s->sh_entsize = get_offset(&mod->core_size, s); |
| 1292 | DEBUGP("\t%s\n", secstrings + s->sh_name); |
| 1293 | } |
| 1294 | if (m == 0) |
| 1295 | mod->core_text_size = mod->core_size; |
| 1296 | } |
| 1297 | |
| 1298 | DEBUGP("Init section allocation order:\n"); |
| 1299 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
| 1300 | for (i = 0; i < hdr->e_shnum; ++i) { |
| 1301 | Elf_Shdr *s = &sechdrs[i]; |
| 1302 | |
| 1303 | if ((s->sh_flags & masks[m][0]) != masks[m][0] |
| 1304 | || (s->sh_flags & masks[m][1]) |
| 1305 | || s->sh_entsize != ~0UL |
| 1306 | || strncmp(secstrings + s->sh_name, |
| 1307 | ".init", 5) != 0) |
| 1308 | continue; |
| 1309 | s->sh_entsize = (get_offset(&mod->init_size, s) |
| 1310 | | INIT_OFFSET_MASK); |
| 1311 | DEBUGP("\t%s\n", secstrings + s->sh_name); |
| 1312 | } |
| 1313 | if (m == 0) |
| 1314 | mod->init_text_size = mod->init_size; |
| 1315 | } |
| 1316 | } |
| 1317 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | static void set_license(struct module *mod, const char *license) |
| 1319 | { |
| 1320 | if (!license) |
| 1321 | license = "unspecified"; |
| 1322 | |
| 1323 | mod->license_gplok = license_is_gpl_compatible(license); |
| 1324 | if (!mod->license_gplok && !(tainted & TAINT_PROPRIETARY_MODULE)) { |
| 1325 | printk(KERN_WARNING "%s: module license '%s' taints kernel.\n", |
| 1326 | mod->name, license); |
Randy Dunlap | 9f15833 | 2005-09-13 01:25:16 -0700 | [diff] [blame] | 1327 | add_taint(TAINT_PROPRIETARY_MODULE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1328 | } |
| 1329 | } |
| 1330 | |
| 1331 | /* Parse tag=value strings from .modinfo section */ |
| 1332 | static char *next_string(char *string, unsigned long *secsize) |
| 1333 | { |
| 1334 | /* Skip non-zero chars */ |
| 1335 | while (string[0]) { |
| 1336 | string++; |
| 1337 | if ((*secsize)-- <= 1) |
| 1338 | return NULL; |
| 1339 | } |
| 1340 | |
| 1341 | /* Skip any zero padding. */ |
| 1342 | while (!string[0]) { |
| 1343 | string++; |
| 1344 | if ((*secsize)-- <= 1) |
| 1345 | return NULL; |
| 1346 | } |
| 1347 | return string; |
| 1348 | } |
| 1349 | |
| 1350 | static char *get_modinfo(Elf_Shdr *sechdrs, |
| 1351 | unsigned int info, |
| 1352 | const char *tag) |
| 1353 | { |
| 1354 | char *p; |
| 1355 | unsigned int taglen = strlen(tag); |
| 1356 | unsigned long size = sechdrs[info].sh_size; |
| 1357 | |
| 1358 | for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) { |
| 1359 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
| 1360 | return p + taglen + 1; |
| 1361 | } |
| 1362 | return NULL; |
| 1363 | } |
| 1364 | |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1365 | static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs, |
| 1366 | unsigned int infoindex) |
| 1367 | { |
| 1368 | struct module_attribute *attr; |
| 1369 | int i; |
| 1370 | |
| 1371 | for (i = 0; (attr = modinfo_attrs[i]); i++) { |
| 1372 | if (attr->setup) |
| 1373 | attr->setup(mod, |
| 1374 | get_modinfo(sechdrs, |
| 1375 | infoindex, |
| 1376 | attr->attr.name)); |
| 1377 | } |
| 1378 | } |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1379 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | #ifdef CONFIG_KALLSYMS |
| 1381 | int is_exported(const char *name, const struct module *mod) |
| 1382 | { |
Sam Ravnborg | 3fd6805 | 2006-02-08 21:16:45 +0100 | [diff] [blame] | 1383 | if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab)) |
| 1384 | return 1; |
| 1385 | else |
Jesper Juhl | f867d2a | 2006-06-25 05:47:09 -0700 | [diff] [blame] | 1386 | if (mod && lookup_symbol(name, mod->syms, mod->syms + mod->num_syms)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | return 1; |
Sam Ravnborg | 3fd6805 | 2006-02-08 21:16:45 +0100 | [diff] [blame] | 1388 | else |
| 1389 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | } |
| 1391 | |
| 1392 | /* As per nm */ |
| 1393 | static char elf_type(const Elf_Sym *sym, |
| 1394 | Elf_Shdr *sechdrs, |
| 1395 | const char *secstrings, |
| 1396 | struct module *mod) |
| 1397 | { |
| 1398 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
| 1399 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) |
| 1400 | return 'v'; |
| 1401 | else |
| 1402 | return 'w'; |
| 1403 | } |
| 1404 | if (sym->st_shndx == SHN_UNDEF) |
| 1405 | return 'U'; |
| 1406 | if (sym->st_shndx == SHN_ABS) |
| 1407 | return 'a'; |
| 1408 | if (sym->st_shndx >= SHN_LORESERVE) |
| 1409 | return '?'; |
| 1410 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) |
| 1411 | return 't'; |
| 1412 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC |
| 1413 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { |
| 1414 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) |
| 1415 | return 'r'; |
| 1416 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) |
| 1417 | return 'g'; |
| 1418 | else |
| 1419 | return 'd'; |
| 1420 | } |
| 1421 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { |
| 1422 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) |
| 1423 | return 's'; |
| 1424 | else |
| 1425 | return 'b'; |
| 1426 | } |
| 1427 | if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name, |
| 1428 | ".debug", strlen(".debug")) == 0) |
| 1429 | return 'n'; |
| 1430 | return '?'; |
| 1431 | } |
| 1432 | |
| 1433 | static void add_kallsyms(struct module *mod, |
| 1434 | Elf_Shdr *sechdrs, |
| 1435 | unsigned int symindex, |
| 1436 | unsigned int strindex, |
| 1437 | const char *secstrings) |
| 1438 | { |
| 1439 | unsigned int i; |
| 1440 | |
| 1441 | mod->symtab = (void *)sechdrs[symindex].sh_addr; |
| 1442 | mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym); |
| 1443 | mod->strtab = (void *)sechdrs[strindex].sh_addr; |
| 1444 | |
| 1445 | /* Set types up while we still have access to sections. */ |
| 1446 | for (i = 0; i < mod->num_symtab; i++) |
| 1447 | mod->symtab[i].st_info |
| 1448 | = elf_type(&mod->symtab[i], sechdrs, secstrings, mod); |
| 1449 | } |
| 1450 | #else |
| 1451 | static inline void add_kallsyms(struct module *mod, |
| 1452 | Elf_Shdr *sechdrs, |
| 1453 | unsigned int symindex, |
| 1454 | unsigned int strindex, |
| 1455 | const char *secstrings) |
| 1456 | { |
| 1457 | } |
| 1458 | #endif /* CONFIG_KALLSYMS */ |
| 1459 | |
| 1460 | /* Allocate and load the module: note that size of section 0 is always |
| 1461 | zero, and we rely on this for optional sections. */ |
| 1462 | static struct module *load_module(void __user *umod, |
| 1463 | unsigned long len, |
| 1464 | const char __user *uargs) |
| 1465 | { |
| 1466 | Elf_Ehdr *hdr; |
| 1467 | Elf_Shdr *sechdrs; |
| 1468 | char *secstrings, *args, *modmagic, *strtab = NULL; |
Andrew Morton | 84860f9 | 2006-06-28 04:26:46 -0700 | [diff] [blame] | 1469 | unsigned int i; |
| 1470 | unsigned int symindex = 0; |
| 1471 | unsigned int strindex = 0; |
| 1472 | unsigned int setupindex; |
| 1473 | unsigned int exindex; |
| 1474 | unsigned int exportindex; |
| 1475 | unsigned int modindex; |
| 1476 | unsigned int obsparmindex; |
| 1477 | unsigned int infoindex; |
| 1478 | unsigned int gplindex; |
| 1479 | unsigned int crcindex; |
| 1480 | unsigned int gplcrcindex; |
| 1481 | unsigned int versindex; |
| 1482 | unsigned int pcpuindex; |
| 1483 | unsigned int gplfutureindex; |
| 1484 | unsigned int gplfuturecrcindex; |
| 1485 | unsigned int unwindex = 0; |
| 1486 | unsigned int unusedindex; |
| 1487 | unsigned int unusedcrcindex; |
| 1488 | unsigned int unusedgplindex; |
| 1489 | unsigned int unusedgplcrcindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | struct module *mod; |
| 1491 | long err = 0; |
| 1492 | void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */ |
| 1493 | struct exception_table_entry *extable; |
Thomas Koeller | 378bac8 | 2005-09-06 15:17:11 -0700 | [diff] [blame] | 1494 | mm_segment_t old_fs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1495 | |
| 1496 | DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n", |
| 1497 | umod, len, uargs); |
| 1498 | if (len < sizeof(*hdr)) |
| 1499 | return ERR_PTR(-ENOEXEC); |
| 1500 | |
| 1501 | /* Suck in entire file: we'll want most of it. */ |
| 1502 | /* vmalloc barfs on "unusual" numbers. Check here */ |
| 1503 | if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL) |
| 1504 | return ERR_PTR(-ENOMEM); |
| 1505 | if (copy_from_user(hdr, umod, len) != 0) { |
| 1506 | err = -EFAULT; |
| 1507 | goto free_hdr; |
| 1508 | } |
| 1509 | |
| 1510 | /* Sanity checks against insmoding binaries or wrong arch, |
| 1511 | weird elf version */ |
| 1512 | if (memcmp(hdr->e_ident, ELFMAG, 4) != 0 |
| 1513 | || hdr->e_type != ET_REL |
| 1514 | || !elf_check_arch(hdr) |
| 1515 | || hdr->e_shentsize != sizeof(*sechdrs)) { |
| 1516 | err = -ENOEXEC; |
| 1517 | goto free_hdr; |
| 1518 | } |
| 1519 | |
| 1520 | if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) |
| 1521 | goto truncated; |
| 1522 | |
| 1523 | /* Convenience variables */ |
| 1524 | sechdrs = (void *)hdr + hdr->e_shoff; |
| 1525 | secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; |
| 1526 | sechdrs[0].sh_addr = 0; |
| 1527 | |
| 1528 | for (i = 1; i < hdr->e_shnum; i++) { |
| 1529 | if (sechdrs[i].sh_type != SHT_NOBITS |
| 1530 | && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) |
| 1531 | goto truncated; |
| 1532 | |
| 1533 | /* Mark all sections sh_addr with their address in the |
| 1534 | temporary image. */ |
| 1535 | sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset; |
| 1536 | |
| 1537 | /* Internal symbols and strings. */ |
| 1538 | if (sechdrs[i].sh_type == SHT_SYMTAB) { |
| 1539 | symindex = i; |
| 1540 | strindex = sechdrs[i].sh_link; |
| 1541 | strtab = (char *)hdr + sechdrs[strindex].sh_offset; |
| 1542 | } |
| 1543 | #ifndef CONFIG_MODULE_UNLOAD |
| 1544 | /* Don't load .exit sections */ |
| 1545 | if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0) |
| 1546 | sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC; |
| 1547 | #endif |
| 1548 | } |
| 1549 | |
| 1550 | modindex = find_sec(hdr, sechdrs, secstrings, |
| 1551 | ".gnu.linkonce.this_module"); |
| 1552 | if (!modindex) { |
| 1553 | printk(KERN_WARNING "No module found in object\n"); |
| 1554 | err = -ENOEXEC; |
| 1555 | goto free_hdr; |
| 1556 | } |
| 1557 | mod = (void *)sechdrs[modindex].sh_addr; |
| 1558 | |
| 1559 | if (symindex == 0) { |
| 1560 | printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", |
| 1561 | mod->name); |
| 1562 | err = -ENOEXEC; |
| 1563 | goto free_hdr; |
| 1564 | } |
| 1565 | |
| 1566 | /* Optional sections */ |
| 1567 | exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab"); |
| 1568 | gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl"); |
Greg Kroah-Hartman | 9f28bb7 | 2006-03-20 13:17:13 -0800 | [diff] [blame] | 1569 | gplfutureindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl_future"); |
Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 1570 | unusedindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused"); |
| 1571 | unusedgplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused_gpl"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab"); |
| 1573 | gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl"); |
Greg Kroah-Hartman | 9f28bb7 | 2006-03-20 13:17:13 -0800 | [diff] [blame] | 1574 | gplfuturecrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl_future"); |
Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 1575 | unusedcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused"); |
| 1576 | unusedgplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused_gpl"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1577 | setupindex = find_sec(hdr, sechdrs, secstrings, "__param"); |
| 1578 | exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table"); |
| 1579 | obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm"); |
| 1580 | versindex = find_sec(hdr, sechdrs, secstrings, "__versions"); |
| 1581 | infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo"); |
| 1582 | pcpuindex = find_pcpusec(hdr, sechdrs, secstrings); |
Jan Beulich | 4552d5d | 2006-06-26 13:57:28 +0200 | [diff] [blame] | 1583 | #ifdef ARCH_UNWIND_SECTION_NAME |
| 1584 | unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME); |
| 1585 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1586 | |
| 1587 | /* Don't keep modinfo section */ |
| 1588 | sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
| 1589 | #ifdef CONFIG_KALLSYMS |
| 1590 | /* Keep symbol and string tables for decoding later. */ |
| 1591 | sechdrs[symindex].sh_flags |= SHF_ALLOC; |
| 1592 | sechdrs[strindex].sh_flags |= SHF_ALLOC; |
| 1593 | #endif |
Jan Beulich | 4552d5d | 2006-06-26 13:57:28 +0200 | [diff] [blame] | 1594 | if (unwindex) |
| 1595 | sechdrs[unwindex].sh_flags |= SHF_ALLOC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | |
| 1597 | /* Check module struct version now, before we try to use module. */ |
| 1598 | if (!check_modstruct_version(sechdrs, versindex, mod)) { |
| 1599 | err = -ENOEXEC; |
| 1600 | goto free_hdr; |
| 1601 | } |
| 1602 | |
| 1603 | modmagic = get_modinfo(sechdrs, infoindex, "vermagic"); |
| 1604 | /* This is allowed: modprobe --force will invalidate it. */ |
| 1605 | if (!modmagic) { |
Randy Dunlap | 9f15833 | 2005-09-13 01:25:16 -0700 | [diff] [blame] | 1606 | add_taint(TAINT_FORCED_MODULE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1607 | printk(KERN_WARNING "%s: no version magic, tainting kernel.\n", |
| 1608 | mod->name); |
| 1609 | } else if (!same_magic(modmagic, vermagic)) { |
| 1610 | printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", |
| 1611 | mod->name, modmagic, vermagic); |
| 1612 | err = -ENOEXEC; |
| 1613 | goto free_hdr; |
| 1614 | } |
| 1615 | |
| 1616 | /* Now copy in args */ |
Davi Arnaut | 24277dd | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 1617 | args = strndup_user(uargs, ~0UL >> 1); |
| 1618 | if (IS_ERR(args)) { |
| 1619 | err = PTR_ERR(args); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1620 | goto free_hdr; |
| 1621 | } |
Andrew Morton | 8e08b75 | 2006-02-07 12:58:45 -0800 | [diff] [blame] | 1622 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1623 | if (find_module(mod->name)) { |
| 1624 | err = -EEXIST; |
| 1625 | goto free_mod; |
| 1626 | } |
| 1627 | |
| 1628 | mod->state = MODULE_STATE_COMING; |
| 1629 | |
| 1630 | /* Allow arches to frob section contents and sizes. */ |
| 1631 | err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod); |
| 1632 | if (err < 0) |
| 1633 | goto free_mod; |
| 1634 | |
| 1635 | if (pcpuindex) { |
| 1636 | /* We have a special allocation for this section. */ |
| 1637 | percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size, |
Rusty Russell | 842bbaa | 2005-08-01 21:11:47 -0700 | [diff] [blame] | 1638 | sechdrs[pcpuindex].sh_addralign, |
| 1639 | mod->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | if (!percpu) { |
| 1641 | err = -ENOMEM; |
| 1642 | goto free_mod; |
| 1643 | } |
| 1644 | sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
| 1645 | mod->percpu = percpu; |
| 1646 | } |
| 1647 | |
| 1648 | /* Determine total sizes, and put offsets in sh_entsize. For now |
| 1649 | this is done generically; there doesn't appear to be any |
| 1650 | special cases for the architectures. */ |
| 1651 | layout_sections(mod, hdr, sechdrs, secstrings); |
| 1652 | |
| 1653 | /* Do the allocs. */ |
| 1654 | ptr = module_alloc(mod->core_size); |
| 1655 | if (!ptr) { |
| 1656 | err = -ENOMEM; |
| 1657 | goto free_percpu; |
| 1658 | } |
| 1659 | memset(ptr, 0, mod->core_size); |
| 1660 | mod->module_core = ptr; |
| 1661 | |
| 1662 | ptr = module_alloc(mod->init_size); |
| 1663 | if (!ptr && mod->init_size) { |
| 1664 | err = -ENOMEM; |
| 1665 | goto free_core; |
| 1666 | } |
| 1667 | memset(ptr, 0, mod->init_size); |
| 1668 | mod->module_init = ptr; |
| 1669 | |
| 1670 | /* Transfer each section which specifies SHF_ALLOC */ |
| 1671 | DEBUGP("final section addresses:\n"); |
| 1672 | for (i = 0; i < hdr->e_shnum; i++) { |
| 1673 | void *dest; |
| 1674 | |
| 1675 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) |
| 1676 | continue; |
| 1677 | |
| 1678 | if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK) |
| 1679 | dest = mod->module_init |
| 1680 | + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK); |
| 1681 | else |
| 1682 | dest = mod->module_core + sechdrs[i].sh_entsize; |
| 1683 | |
| 1684 | if (sechdrs[i].sh_type != SHT_NOBITS) |
| 1685 | memcpy(dest, (void *)sechdrs[i].sh_addr, |
| 1686 | sechdrs[i].sh_size); |
| 1687 | /* Update sh_addr to point to copy in image. */ |
| 1688 | sechdrs[i].sh_addr = (unsigned long)dest; |
| 1689 | DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name); |
| 1690 | } |
| 1691 | /* Module has been moved. */ |
| 1692 | mod = (void *)sechdrs[modindex].sh_addr; |
| 1693 | |
| 1694 | /* Now we've moved module, initialize linked lists, etc. */ |
| 1695 | module_unload_init(mod); |
| 1696 | |
| 1697 | /* Set up license info based on the info section */ |
| 1698 | set_license(mod, get_modinfo(sechdrs, infoindex, "license")); |
| 1699 | |
Dave Jones | 9841d61d | 2006-01-08 01:03:41 -0800 | [diff] [blame] | 1700 | if (strcmp(mod->name, "ndiswrapper") == 0) |
| 1701 | add_taint(TAINT_PROPRIETARY_MODULE); |
| 1702 | if (strcmp(mod->name, "driverloader") == 0) |
| 1703 | add_taint(TAINT_PROPRIETARY_MODULE); |
| 1704 | |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1705 | /* Set up MODINFO_ATTR fields */ |
| 1706 | setup_modinfo(mod, sechdrs, infoindex); |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1707 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | /* Fix up syms, so that st_value is a pointer to location. */ |
| 1709 | err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex, |
| 1710 | mod); |
| 1711 | if (err < 0) |
| 1712 | goto cleanup; |
| 1713 | |
| 1714 | /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */ |
| 1715 | mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms); |
| 1716 | mod->syms = (void *)sechdrs[exportindex].sh_addr; |
| 1717 | if (crcindex) |
| 1718 | mod->crcs = (void *)sechdrs[crcindex].sh_addr; |
| 1719 | mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms); |
| 1720 | mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr; |
| 1721 | if (gplcrcindex) |
| 1722 | mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr; |
Greg Kroah-Hartman | 9f28bb7 | 2006-03-20 13:17:13 -0800 | [diff] [blame] | 1723 | mod->num_gpl_future_syms = sechdrs[gplfutureindex].sh_size / |
| 1724 | sizeof(*mod->gpl_future_syms); |
Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 1725 | mod->num_unused_syms = sechdrs[unusedindex].sh_size / |
| 1726 | sizeof(*mod->unused_syms); |
| 1727 | mod->num_unused_gpl_syms = sechdrs[unusedgplindex].sh_size / |
| 1728 | sizeof(*mod->unused_gpl_syms); |
Greg Kroah-Hartman | 9f28bb7 | 2006-03-20 13:17:13 -0800 | [diff] [blame] | 1729 | mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr; |
| 1730 | if (gplfuturecrcindex) |
| 1731 | mod->gpl_future_crcs = (void *)sechdrs[gplfuturecrcindex].sh_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | |
Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 1733 | mod->unused_syms = (void *)sechdrs[unusedindex].sh_addr; |
| 1734 | if (unusedcrcindex) |
| 1735 | mod->unused_crcs = (void *)sechdrs[unusedcrcindex].sh_addr; |
| 1736 | mod->unused_gpl_syms = (void *)sechdrs[unusedgplindex].sh_addr; |
| 1737 | if (unusedgplcrcindex) |
| 1738 | mod->unused_crcs = (void *)sechdrs[unusedgplcrcindex].sh_addr; |
| 1739 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1740 | #ifdef CONFIG_MODVERSIONS |
| 1741 | if ((mod->num_syms && !crcindex) || |
Greg Kroah-Hartman | 9f28bb7 | 2006-03-20 13:17:13 -0800 | [diff] [blame] | 1742 | (mod->num_gpl_syms && !gplcrcindex) || |
Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 1743 | (mod->num_gpl_future_syms && !gplfuturecrcindex) || |
| 1744 | (mod->num_unused_syms && !unusedcrcindex) || |
| 1745 | (mod->num_unused_gpl_syms && !unusedgplcrcindex)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1746 | printk(KERN_WARNING "%s: No versions for exported symbols." |
| 1747 | " Tainting kernel.\n", mod->name); |
Randy Dunlap | 9f15833 | 2005-09-13 01:25:16 -0700 | [diff] [blame] | 1748 | add_taint(TAINT_FORCED_MODULE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1749 | } |
| 1750 | #endif |
| 1751 | |
| 1752 | /* Now do relocations. */ |
| 1753 | for (i = 1; i < hdr->e_shnum; i++) { |
| 1754 | const char *strtab = (char *)sechdrs[strindex].sh_addr; |
| 1755 | unsigned int info = sechdrs[i].sh_info; |
| 1756 | |
| 1757 | /* Not a valid relocation section? */ |
| 1758 | if (info >= hdr->e_shnum) |
| 1759 | continue; |
| 1760 | |
| 1761 | /* Don't bother with non-allocated sections */ |
| 1762 | if (!(sechdrs[info].sh_flags & SHF_ALLOC)) |
| 1763 | continue; |
| 1764 | |
| 1765 | if (sechdrs[i].sh_type == SHT_REL) |
| 1766 | err = apply_relocate(sechdrs, strtab, symindex, i,mod); |
| 1767 | else if (sechdrs[i].sh_type == SHT_RELA) |
| 1768 | err = apply_relocate_add(sechdrs, strtab, symindex, i, |
| 1769 | mod); |
| 1770 | if (err < 0) |
| 1771 | goto cleanup; |
| 1772 | } |
| 1773 | |
Ashutosh Naik | eea8b54 | 2006-01-08 01:04:25 -0800 | [diff] [blame] | 1774 | /* Find duplicate symbols */ |
| 1775 | err = verify_export_symbols(mod); |
| 1776 | |
| 1777 | if (err < 0) |
| 1778 | goto cleanup; |
| 1779 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | /* Set up and sort exception table */ |
| 1781 | mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable); |
| 1782 | mod->extable = extable = (void *)sechdrs[exindex].sh_addr; |
| 1783 | sort_extable(extable, extable + mod->num_exentries); |
| 1784 | |
| 1785 | /* Finally, copy percpu area over. */ |
| 1786 | percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr, |
| 1787 | sechdrs[pcpuindex].sh_size); |
| 1788 | |
| 1789 | add_kallsyms(mod, sechdrs, symindex, strindex, secstrings); |
| 1790 | |
| 1791 | err = module_finalize(hdr, sechdrs, mod); |
| 1792 | if (err < 0) |
| 1793 | goto cleanup; |
| 1794 | |
Thomas Koeller | 378bac8 | 2005-09-06 15:17:11 -0700 | [diff] [blame] | 1795 | /* flush the icache in correct context */ |
| 1796 | old_fs = get_fs(); |
| 1797 | set_fs(KERNEL_DS); |
| 1798 | |
| 1799 | /* |
| 1800 | * Flush the instruction cache, since we've played with text. |
| 1801 | * Do it before processing of module parameters, so the module |
| 1802 | * can provide parameter accessor functions of its own. |
| 1803 | */ |
| 1804 | if (mod->module_init) |
| 1805 | flush_icache_range((unsigned long)mod->module_init, |
| 1806 | (unsigned long)mod->module_init |
| 1807 | + mod->init_size); |
| 1808 | flush_icache_range((unsigned long)mod->module_core, |
| 1809 | (unsigned long)mod->module_core + mod->core_size); |
| 1810 | |
| 1811 | set_fs(old_fs); |
| 1812 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1813 | mod->args = args; |
Rusty Russell | 8d3b33f | 2006-03-25 03:07:05 -0800 | [diff] [blame] | 1814 | if (obsparmindex) |
| 1815 | printk(KERN_WARNING "%s: Ignoring obsolete parameters\n", |
| 1816 | mod->name); |
| 1817 | |
| 1818 | /* Size of section 0 is 0, so this works well if no params */ |
| 1819 | err = parse_args(mod->name, mod->args, |
| 1820 | (struct kernel_param *) |
| 1821 | sechdrs[setupindex].sh_addr, |
| 1822 | sechdrs[setupindex].sh_size |
| 1823 | / sizeof(struct kernel_param), |
| 1824 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1825 | if (err < 0) |
| 1826 | goto arch_cleanup; |
| 1827 | |
| 1828 | err = mod_sysfs_setup(mod, |
| 1829 | (struct kernel_param *) |
| 1830 | sechdrs[setupindex].sh_addr, |
| 1831 | sechdrs[setupindex].sh_size |
| 1832 | / sizeof(struct kernel_param)); |
| 1833 | if (err < 0) |
| 1834 | goto arch_cleanup; |
| 1835 | add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
| 1836 | |
Jan Beulich | 4552d5d | 2006-06-26 13:57:28 +0200 | [diff] [blame] | 1837 | /* Size of section 0 is 0, so this works well if no unwind info. */ |
| 1838 | mod->unwind_info = unwind_add_table(mod, |
| 1839 | (void *)sechdrs[unwindex].sh_addr, |
| 1840 | sechdrs[unwindex].sh_size); |
| 1841 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1842 | /* Get rid of temporary copy */ |
| 1843 | vfree(hdr); |
| 1844 | |
| 1845 | /* Done! */ |
| 1846 | return mod; |
| 1847 | |
| 1848 | arch_cleanup: |
| 1849 | module_arch_cleanup(mod); |
| 1850 | cleanup: |
| 1851 | module_unload_free(mod); |
| 1852 | module_free(mod, mod->module_init); |
| 1853 | free_core: |
| 1854 | module_free(mod, mod->module_core); |
| 1855 | free_percpu: |
| 1856 | if (percpu) |
| 1857 | percpu_modfree(percpu); |
| 1858 | free_mod: |
| 1859 | kfree(args); |
| 1860 | free_hdr: |
| 1861 | vfree(hdr); |
Jayachandran C | 6fe2e70 | 2006-01-06 00:19:54 -0800 | [diff] [blame] | 1862 | return ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1863 | |
| 1864 | truncated: |
| 1865 | printk(KERN_ERR "Module len %lu truncated\n", len); |
| 1866 | err = -ENOEXEC; |
| 1867 | goto free_hdr; |
| 1868 | } |
| 1869 | |
| 1870 | /* |
| 1871 | * link the module with the whole machine is stopped with interrupts off |
| 1872 | * - this defends against kallsyms not taking locks |
| 1873 | */ |
| 1874 | static int __link_module(void *_mod) |
| 1875 | { |
| 1876 | struct module *mod = _mod; |
| 1877 | list_add(&mod->list, &modules); |
| 1878 | return 0; |
| 1879 | } |
| 1880 | |
| 1881 | /* This is where the real work happens */ |
| 1882 | asmlinkage long |
| 1883 | sys_init_module(void __user *umod, |
| 1884 | unsigned long len, |
| 1885 | const char __user *uargs) |
| 1886 | { |
| 1887 | struct module *mod; |
| 1888 | int ret = 0; |
| 1889 | |
| 1890 | /* Must have permission */ |
| 1891 | if (!capable(CAP_SYS_MODULE)) |
| 1892 | return -EPERM; |
| 1893 | |
| 1894 | /* Only one module load at a time, please */ |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 1895 | if (mutex_lock_interruptible(&module_mutex) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1896 | return -EINTR; |
| 1897 | |
| 1898 | /* Do all the hard work */ |
| 1899 | mod = load_module(umod, len, uargs); |
| 1900 | if (IS_ERR(mod)) { |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 1901 | mutex_unlock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1902 | return PTR_ERR(mod); |
| 1903 | } |
| 1904 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1905 | /* Now sew it into the lists. They won't access us, since |
| 1906 | strong_try_module_get() will fail. */ |
| 1907 | stop_machine_run(__link_module, mod, NR_CPUS); |
| 1908 | |
| 1909 | /* Drop lock so they can recurse */ |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 1910 | mutex_unlock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1911 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 1912 | blocking_notifier_call_chain(&module_notify_list, |
| 1913 | MODULE_STATE_COMING, mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1914 | |
| 1915 | /* Start the module */ |
| 1916 | if (mod->init != NULL) |
| 1917 | ret = mod->init(); |
| 1918 | if (ret < 0) { |
| 1919 | /* Init routine failed: abort. Try to protect us from |
| 1920 | buggy refcounters. */ |
| 1921 | mod->state = MODULE_STATE_GOING; |
Paul E. McKenney | fbd568a3e | 2005-05-01 08:59:04 -0700 | [diff] [blame] | 1922 | synchronize_sched(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1923 | if (mod->unsafe) |
| 1924 | printk(KERN_ERR "%s: module is now stuck!\n", |
| 1925 | mod->name); |
| 1926 | else { |
| 1927 | module_put(mod); |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 1928 | mutex_lock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1929 | free_module(mod); |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 1930 | mutex_unlock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1931 | } |
| 1932 | return ret; |
| 1933 | } |
| 1934 | |
| 1935 | /* Now it's a first class citizen! */ |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 1936 | mutex_lock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1937 | mod->state = MODULE_STATE_LIVE; |
| 1938 | /* Drop initial reference. */ |
| 1939 | module_put(mod); |
Jan Beulich | 4552d5d | 2006-06-26 13:57:28 +0200 | [diff] [blame] | 1940 | unwind_remove_table(mod->unwind_info, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1941 | module_free(mod, mod->module_init); |
| 1942 | mod->module_init = NULL; |
| 1943 | mod->init_size = 0; |
| 1944 | mod->init_text_size = 0; |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 1945 | mutex_unlock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1946 | |
| 1947 | return 0; |
| 1948 | } |
| 1949 | |
| 1950 | static inline int within(unsigned long addr, void *start, unsigned long size) |
| 1951 | { |
| 1952 | return ((void *)addr >= start && (void *)addr < start + size); |
| 1953 | } |
| 1954 | |
| 1955 | #ifdef CONFIG_KALLSYMS |
| 1956 | /* |
| 1957 | * This ignores the intensely annoying "mapping symbols" found |
| 1958 | * in ARM ELF files: $a, $t and $d. |
| 1959 | */ |
| 1960 | static inline int is_arm_mapping_symbol(const char *str) |
| 1961 | { |
| 1962 | return str[0] == '$' && strchr("atd", str[1]) |
| 1963 | && (str[2] == '\0' || str[2] == '.'); |
| 1964 | } |
| 1965 | |
| 1966 | static const char *get_ksymbol(struct module *mod, |
| 1967 | unsigned long addr, |
| 1968 | unsigned long *size, |
| 1969 | unsigned long *offset) |
| 1970 | { |
| 1971 | unsigned int i, best = 0; |
| 1972 | unsigned long nextval; |
| 1973 | |
| 1974 | /* At worse, next value is at end of module */ |
| 1975 | if (within(addr, mod->module_init, mod->init_size)) |
| 1976 | nextval = (unsigned long)mod->module_init+mod->init_text_size; |
| 1977 | else |
| 1978 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
| 1979 | |
| 1980 | /* Scan for closest preceeding symbol, and next symbol. (ELF |
| 1981 | starts real symbols at 1). */ |
| 1982 | for (i = 1; i < mod->num_symtab; i++) { |
| 1983 | if (mod->symtab[i].st_shndx == SHN_UNDEF) |
| 1984 | continue; |
| 1985 | |
| 1986 | /* We ignore unnamed symbols: they're uninformative |
| 1987 | * and inserted at a whim. */ |
| 1988 | if (mod->symtab[i].st_value <= addr |
| 1989 | && mod->symtab[i].st_value > mod->symtab[best].st_value |
| 1990 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' |
| 1991 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) |
| 1992 | best = i; |
| 1993 | if (mod->symtab[i].st_value > addr |
| 1994 | && mod->symtab[i].st_value < nextval |
| 1995 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' |
| 1996 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) |
| 1997 | nextval = mod->symtab[i].st_value; |
| 1998 | } |
| 1999 | |
| 2000 | if (!best) |
| 2001 | return NULL; |
| 2002 | |
| 2003 | *size = nextval - mod->symtab[best].st_value; |
| 2004 | *offset = addr - mod->symtab[best].st_value; |
| 2005 | return mod->strtab + mod->symtab[best].st_name; |
| 2006 | } |
| 2007 | |
| 2008 | /* For kallsyms to ask for address resolution. NULL means not found. |
| 2009 | We don't lock, as this is used for oops resolution and races are a |
| 2010 | lesser concern. */ |
| 2011 | const char *module_address_lookup(unsigned long addr, |
| 2012 | unsigned long *size, |
| 2013 | unsigned long *offset, |
| 2014 | char **modname) |
| 2015 | { |
| 2016 | struct module *mod; |
| 2017 | |
| 2018 | list_for_each_entry(mod, &modules, list) { |
| 2019 | if (within(addr, mod->module_init, mod->init_size) |
| 2020 | || within(addr, mod->module_core, mod->core_size)) { |
| 2021 | *modname = mod->name; |
| 2022 | return get_ksymbol(mod, addr, size, offset); |
| 2023 | } |
| 2024 | } |
| 2025 | return NULL; |
| 2026 | } |
| 2027 | |
Andreas Gruenbacher | 098c5ee | 2006-07-14 00:24:04 -0700 | [diff] [blame] | 2028 | struct module *module_get_kallsym(unsigned int symnum, unsigned long *value, |
| 2029 | char *type, char *name, size_t namelen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2030 | { |
| 2031 | struct module *mod; |
| 2032 | |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 2033 | mutex_lock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2034 | list_for_each_entry(mod, &modules, list) { |
| 2035 | if (symnum < mod->num_symtab) { |
| 2036 | *value = mod->symtab[symnum].st_value; |
| 2037 | *type = mod->symtab[symnum].st_info; |
Andreas Gruenbacher | 098c5ee | 2006-07-14 00:24:04 -0700 | [diff] [blame] | 2038 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
| 2039 | namelen); |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 2040 | mutex_unlock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2041 | return mod; |
| 2042 | } |
| 2043 | symnum -= mod->num_symtab; |
| 2044 | } |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 2045 | mutex_unlock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2046 | return NULL; |
| 2047 | } |
| 2048 | |
| 2049 | static unsigned long mod_find_symname(struct module *mod, const char *name) |
| 2050 | { |
| 2051 | unsigned int i; |
| 2052 | |
| 2053 | for (i = 0; i < mod->num_symtab; i++) |
Keith Owens | 54e8ce4 | 2006-02-03 03:03:53 -0800 | [diff] [blame] | 2054 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
| 2055 | mod->symtab[i].st_info != 'U') |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2056 | return mod->symtab[i].st_value; |
| 2057 | return 0; |
| 2058 | } |
| 2059 | |
| 2060 | /* Look for this name: can be of form module:name. */ |
| 2061 | unsigned long module_kallsyms_lookup_name(const char *name) |
| 2062 | { |
| 2063 | struct module *mod; |
| 2064 | char *colon; |
| 2065 | unsigned long ret = 0; |
| 2066 | |
| 2067 | /* Don't lock: we're in enough trouble already. */ |
| 2068 | if ((colon = strchr(name, ':')) != NULL) { |
| 2069 | *colon = '\0'; |
| 2070 | if ((mod = find_module(name)) != NULL) |
| 2071 | ret = mod_find_symname(mod, colon+1); |
| 2072 | *colon = ':'; |
| 2073 | } else { |
| 2074 | list_for_each_entry(mod, &modules, list) |
| 2075 | if ((ret = mod_find_symname(mod, name)) != 0) |
| 2076 | break; |
| 2077 | } |
| 2078 | return ret; |
| 2079 | } |
| 2080 | #endif /* CONFIG_KALLSYMS */ |
| 2081 | |
| 2082 | /* Called by the /proc file system to return a list of modules. */ |
| 2083 | static void *m_start(struct seq_file *m, loff_t *pos) |
| 2084 | { |
| 2085 | struct list_head *i; |
| 2086 | loff_t n = 0; |
| 2087 | |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 2088 | mutex_lock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | list_for_each(i, &modules) { |
| 2090 | if (n++ == *pos) |
| 2091 | break; |
| 2092 | } |
| 2093 | if (i == &modules) |
| 2094 | return NULL; |
| 2095 | return i; |
| 2096 | } |
| 2097 | |
| 2098 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) |
| 2099 | { |
| 2100 | struct list_head *i = p; |
| 2101 | (*pos)++; |
| 2102 | if (i->next == &modules) |
| 2103 | return NULL; |
| 2104 | return i->next; |
| 2105 | } |
| 2106 | |
| 2107 | static void m_stop(struct seq_file *m, void *p) |
| 2108 | { |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 2109 | mutex_unlock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2110 | } |
| 2111 | |
| 2112 | static int m_show(struct seq_file *m, void *p) |
| 2113 | { |
| 2114 | struct module *mod = list_entry(p, struct module, list); |
| 2115 | seq_printf(m, "%s %lu", |
| 2116 | mod->name, mod->init_size + mod->core_size); |
| 2117 | print_unload_info(m, mod); |
| 2118 | |
| 2119 | /* Informative for users. */ |
| 2120 | seq_printf(m, " %s", |
| 2121 | mod->state == MODULE_STATE_GOING ? "Unloading": |
| 2122 | mod->state == MODULE_STATE_COMING ? "Loading": |
| 2123 | "Live"); |
| 2124 | /* Used by oprofile and other similar tools. */ |
| 2125 | seq_printf(m, " 0x%p", mod->module_core); |
| 2126 | |
| 2127 | seq_printf(m, "\n"); |
| 2128 | return 0; |
| 2129 | } |
| 2130 | |
| 2131 | /* Format: modulename size refcount deps address |
| 2132 | |
| 2133 | Where refcount is a number or -, and deps is a comma-separated list |
| 2134 | of depends or -. |
| 2135 | */ |
| 2136 | struct seq_operations modules_op = { |
| 2137 | .start = m_start, |
| 2138 | .next = m_next, |
| 2139 | .stop = m_stop, |
| 2140 | .show = m_show |
| 2141 | }; |
| 2142 | |
| 2143 | /* Given an address, look for it in the module exception tables. */ |
| 2144 | const struct exception_table_entry *search_module_extables(unsigned long addr) |
| 2145 | { |
| 2146 | unsigned long flags; |
| 2147 | const struct exception_table_entry *e = NULL; |
| 2148 | struct module *mod; |
| 2149 | |
| 2150 | spin_lock_irqsave(&modlist_lock, flags); |
| 2151 | list_for_each_entry(mod, &modules, list) { |
| 2152 | if (mod->num_exentries == 0) |
| 2153 | continue; |
| 2154 | |
| 2155 | e = search_extable(mod->extable, |
| 2156 | mod->extable + mod->num_exentries - 1, |
| 2157 | addr); |
| 2158 | if (e) |
| 2159 | break; |
| 2160 | } |
| 2161 | spin_unlock_irqrestore(&modlist_lock, flags); |
| 2162 | |
| 2163 | /* Now, if we found one, we are running inside it now, hence |
| 2164 | we cannot unload the module, hence no refcnt needed. */ |
| 2165 | return e; |
| 2166 | } |
| 2167 | |
Ingo Molnar | 4d435f9 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 2168 | /* |
| 2169 | * Is this a valid module address? |
| 2170 | */ |
| 2171 | int is_module_address(unsigned long addr) |
| 2172 | { |
| 2173 | unsigned long flags; |
| 2174 | struct module *mod; |
| 2175 | |
| 2176 | spin_lock_irqsave(&modlist_lock, flags); |
| 2177 | |
| 2178 | list_for_each_entry(mod, &modules, list) { |
| 2179 | if (within(addr, mod->module_core, mod->core_size)) { |
| 2180 | spin_unlock_irqrestore(&modlist_lock, flags); |
| 2181 | return 1; |
| 2182 | } |
| 2183 | } |
| 2184 | |
| 2185 | spin_unlock_irqrestore(&modlist_lock, flags); |
| 2186 | |
| 2187 | return 0; |
| 2188 | } |
| 2189 | |
| 2190 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2191 | /* Is this a valid kernel address? We don't grab the lock: we are oopsing. */ |
| 2192 | struct module *__module_text_address(unsigned long addr) |
| 2193 | { |
| 2194 | struct module *mod; |
| 2195 | |
| 2196 | list_for_each_entry(mod, &modules, list) |
| 2197 | if (within(addr, mod->module_init, mod->init_text_size) |
| 2198 | || within(addr, mod->module_core, mod->core_text_size)) |
| 2199 | return mod; |
| 2200 | return NULL; |
| 2201 | } |
| 2202 | |
| 2203 | struct module *module_text_address(unsigned long addr) |
| 2204 | { |
| 2205 | struct module *mod; |
| 2206 | unsigned long flags; |
| 2207 | |
| 2208 | spin_lock_irqsave(&modlist_lock, flags); |
| 2209 | mod = __module_text_address(addr); |
| 2210 | spin_unlock_irqrestore(&modlist_lock, flags); |
| 2211 | |
| 2212 | return mod; |
| 2213 | } |
| 2214 | |
| 2215 | /* Don't grab lock, we're oopsing. */ |
| 2216 | void print_modules(void) |
| 2217 | { |
| 2218 | struct module *mod; |
| 2219 | |
| 2220 | printk("Modules linked in:"); |
| 2221 | list_for_each_entry(mod, &modules, list) |
| 2222 | printk(" %s", mod->name); |
| 2223 | printk("\n"); |
| 2224 | } |
| 2225 | |
| 2226 | void module_add_driver(struct module *mod, struct device_driver *drv) |
| 2227 | { |
| 2228 | if (!mod || !drv) |
| 2229 | return; |
| 2230 | |
| 2231 | /* Don't check return code; this call is idempotent */ |
| 2232 | sysfs_create_link(&drv->kobj, &mod->mkobj.kobj, "module"); |
| 2233 | } |
| 2234 | EXPORT_SYMBOL(module_add_driver); |
| 2235 | |
| 2236 | void module_remove_driver(struct device_driver *drv) |
| 2237 | { |
| 2238 | if (!drv) |
| 2239 | return; |
| 2240 | sysfs_remove_link(&drv->kobj, "module"); |
| 2241 | } |
| 2242 | EXPORT_SYMBOL(module_remove_driver); |
| 2243 | |
| 2244 | #ifdef CONFIG_MODVERSIONS |
| 2245 | /* Generate the signature for struct module here, too, for modversions. */ |
| 2246 | void struct_module(struct module *mod) { return; } |
| 2247 | EXPORT_SYMBOL(struct_module); |
| 2248 | #endif |