1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Dynamic loading of modules into the kernel. 4 * 5 * Rewritten by Richard Henderson <[email protected]> Dec 1996 6 * Rewritten again by Rusty Russell, 2002 7 */ 8 9 #ifndef _LINUX_MODULE_H 10 #define _LINUX_MODULE_H 11 12 #include <linux/list.h> 13 #include <linux/stat.h> 14 #include <linux/compiler.h> 15 #include <linux/cache.h> 16 #include <linux/kmod.h> 17 #include <linux/init.h> 18 #include <linux/elf.h> 19 #include <linux/stringify.h> 20 #include <linux/kobject.h> 21 #include <linux/moduleparam.h> 22 #include <linux/jump_label.h> 23 #include <linux/export.h> 24 #include <linux/rbtree_latch.h> 25 #include <linux/error-injection.h> 26 #include <linux/tracepoint-defs.h> 27 #include <linux/srcu.h> 28 29 #include <linux/percpu.h> 30 #include <asm/module.h> 31 32 /* Not Yet Implemented */ 33 #define MODULE_SUPPORTED_DEVICE(name) 34 35 #define MODULE_NAME_LEN MAX_PARAM_PREFIX_LEN 36 37 struct modversion_info { 38 unsigned long crc; 39 char name[MODULE_NAME_LEN]; 40 }; 41 42 struct module; 43 struct exception_table_entry; 44 45 struct module_kobject { 46 struct kobject kobj; 47 struct module *mod; 48 struct kobject *drivers_dir; 49 struct module_param_attrs *mp; 50 struct completion *kobj_completion; 51 } __randomize_layout; 52 53 struct module_attribute { 54 struct attribute attr; 55 ssize_t (*show)(struct module_attribute *, struct module_kobject *, 56 char *); 57 ssize_t (*store)(struct module_attribute *, struct module_kobject *, 58 const char *, size_t count); 59 void (*setup)(struct module *, const char *); 60 int (*test)(struct module *); 61 void (*free)(struct module *); 62 }; 63 64 struct module_version_attribute { 65 struct module_attribute mattr; 66 const char *module_name; 67 const char *version; 68 } __attribute__ ((__aligned__(sizeof(void *)))); 69 70 extern ssize_t __modver_version_show(struct module_attribute *, 71 struct module_kobject *, char *); 72 73 extern struct module_attribute module_uevent; 74 75 /* These are either module local, or the kernel's dummy ones. */ 76 extern int init_module(void); 77 extern void cleanup_module(void); 78 79 #ifndef MODULE 80 /** 81 * module_init() - driver initialization entry point 82 * @x: function to be run at kernel boot time or module insertion 83 * 84 * module_init() will either be called during do_initcalls() (if 85 * builtin) or at module insertion time (if a module). There can only 86 * be one per module. 87 */ 88 #define module_init(x) __initcall(x); 89 90 /** 91 * module_exit() - driver exit entry point 92 * @x: function to be run when driver is removed 93 * 94 * module_exit() will wrap the driver clean-up code 95 * with cleanup_module() when used with rmmod when 96 * the driver is a module. If the driver is statically 97 * compiled into the kernel, module_exit() has no effect. 98 * There can only be one per module. 99 */ 100 #define module_exit(x) __exitcall(x); 101 102 #else /* MODULE */ 103 104 /* 105 * In most cases loadable modules do not need custom 106 * initcall levels. There are still some valid cases where 107 * a driver may be needed early if built in, and does not 108 * matter when built as a loadable module. Like bus 109 * snooping debug drivers. 110 */ 111 #define early_initcall(fn) module_init(fn) 112 #define core_initcall(fn) module_init(fn) 113 #define core_initcall_sync(fn) module_init(fn) 114 #define postcore_initcall(fn) module_init(fn) 115 #define postcore_initcall_sync(fn) module_init(fn) 116 #define arch_initcall(fn) module_init(fn) 117 #define subsys_initcall(fn) module_init(fn) 118 #define subsys_initcall_sync(fn) module_init(fn) 119 #define fs_initcall(fn) module_init(fn) 120 #define fs_initcall_sync(fn) module_init(fn) 121 #define rootfs_initcall(fn) module_init(fn) 122 #define device_initcall(fn) module_init(fn) 123 #define device_initcall_sync(fn) module_init(fn) 124 #define late_initcall(fn) module_init(fn) 125 #define late_initcall_sync(fn) module_init(fn) 126 127 #define console_initcall(fn) module_init(fn) 128 129 /* Each module must use one module_init(). */ 130 #define module_init(initfn) \ 131 static inline initcall_t __maybe_unused __inittest(void) \ 132 { return initfn; } \ 133 int init_module(void) __copy(initfn) __attribute__((alias(#initfn))); 134 135 /* This is only required if you want to be unloadable. */ 136 #define module_exit(exitfn) \ 137 static inline exitcall_t __maybe_unused __exittest(void) \ 138 { return exitfn; } \ 139 void cleanup_module(void) __copy(exitfn) __attribute__((alias(#exitfn))); 140 141 #endif 142 143 /* This means "can be init if no module support, otherwise module load 144 may call it." */ 145 #ifdef CONFIG_MODULES 146 #define __init_or_module 147 #define __initdata_or_module 148 #define __initconst_or_module 149 #define __INIT_OR_MODULE .text 150 #define __INITDATA_OR_MODULE .data 151 #define __INITRODATA_OR_MODULE .section ".rodata","a",%progbits 152 #else 153 #define __init_or_module __init 154 #define __initdata_or_module __initdata 155 #define __initconst_or_module __initconst 156 #define __INIT_OR_MODULE __INIT 157 #define __INITDATA_OR_MODULE __INITDATA 158 #define __INITRODATA_OR_MODULE __INITRODATA 159 #endif /*CONFIG_MODULES*/ 160 161 /* Generic info of form tag = "info" */ 162 #define MODULE_INFO(tag, info) __MODULE_INFO(tag, tag, info) 163 164 /* For userspace: you can also call me... */ 165 #define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias) 166 167 /* Soft module dependencies. See man modprobe.d for details. 168 * Example: MODULE_SOFTDEP("pre: module-foo module-bar post: module-baz") 169 */ 170 #define MODULE_SOFTDEP(_softdep) MODULE_INFO(softdep, _softdep) 171 172 /* 173 * The following license idents are currently accepted as indicating free 174 * software modules 175 * 176 * "GPL" [GNU Public License v2] 177 * "GPL v2" [GNU Public License v2] 178 * "GPL and additional rights" [GNU Public License v2 rights and more] 179 * "Dual BSD/GPL" [GNU Public License v2 180 * or BSD license choice] 181 * "Dual MIT/GPL" [GNU Public License v2 182 * or MIT license choice] 183 * "Dual MPL/GPL" [GNU Public License v2 184 * or Mozilla license choice] 185 * 186 * The following other idents are available 187 * 188 * "Proprietary" [Non free products] 189 * 190 * Both "GPL v2" and "GPL" (the latter also in dual licensed strings) are 191 * merely stating that the module is licensed under the GPL v2, but are not 192 * telling whether "GPL v2 only" or "GPL v2 or later". The reason why there 193 * are two variants is a historic and failed attempt to convey more 194 * information in the MODULE_LICENSE string. For module loading the 195 * "only/or later" distinction is completely irrelevant and does neither 196 * replace the proper license identifiers in the corresponding source file 197 * nor amends them in any way. The sole purpose is to make the 198 * 'Proprietary' flagging work and to refuse to bind symbols which are 199 * exported with EXPORT_SYMBOL_GPL when a non free module is loaded. 200 * 201 * In the same way "BSD" is not a clear license information. It merely 202 * states, that the module is licensed under one of the compatible BSD 203 * license variants. The detailed and correct license information is again 204 * to be found in the corresponding source files. 205 * 206 * There are dual licensed components, but when running with Linux it is the 207 * GPL that is relevant so this is a non issue. Similarly LGPL linked with GPL 208 * is a GPL combined work. 209 * 210 * This exists for several reasons 211 * 1. So modinfo can show license info for users wanting to vet their setup 212 * is free 213 * 2. So the community can ignore bug reports including proprietary modules 214 * 3. So vendors can do likewise based on their own policies 215 */ 216 #define MODULE_LICENSE(_license) MODULE_INFO(license, _license) 217 218 /* 219 * Author(s), use "Name <email>" or just "Name", for multiple 220 * authors use multiple MODULE_AUTHOR() statements/lines. 221 */ 222 #define MODULE_AUTHOR(_author) MODULE_INFO(author, _author) 223 224 /* What your module does. */ 225 #define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description) 226 227 #ifdef MODULE 228 /* Creates an alias so file2alias.c can find device table. */ 229 #define MODULE_DEVICE_TABLE(type, name) \ 230 extern typeof(name) __mod_##type##__##name##_device_table \ 231 __attribute__ ((unused, alias(__stringify(name)))) 232 #else /* !MODULE */ 233 #define MODULE_DEVICE_TABLE(type, name) 234 #endif 235 236 /* Version of form [<epoch>:]<version>[-<extra-version>]. 237 * Or for CVS/RCS ID version, everything but the number is stripped. 238 * <epoch>: A (small) unsigned integer which allows you to start versions 239 * anew. If not mentioned, it's zero. eg. "2:1.0" is after 240 * "1:2.0". 241 242 * <version>: The <version> may contain only alphanumerics and the 243 * character `.'. Ordered by numeric sort for numeric parts, 244 * ascii sort for ascii parts (as per RPM or DEB algorithm). 245 246 * <extraversion>: Like <version>, but inserted for local 247 * customizations, eg "rh3" or "rusty1". 248 249 * Using this automatically adds a checksum of the .c files and the 250 * local headers in "srcversion". 251 */ 252 253 #if defined(MODULE) || !defined(CONFIG_SYSFS) 254 #define MODULE_VERSION(_version) MODULE_INFO(version, _version) 255 #else 256 #define MODULE_VERSION(_version) \ 257 MODULE_INFO(version, _version); \ 258 static struct module_version_attribute ___modver_attr = { \ 259 .mattr = { \ 260 .attr = { \ 261 .name = "version", \ 262 .mode = S_IRUGO, \ 263 }, \ 264 .show = __modver_version_show, \ 265 }, \ 266 .module_name = KBUILD_MODNAME, \ 267 .version = _version, \ 268 }; \ 269 static const struct module_version_attribute \ 270 __used __attribute__ ((__section__ ("__modver"))) \ 271 * __moduleparam_const __modver_attr = &___modver_attr 272 #endif 273 274 /* Optional firmware file (or files) needed by the module 275 * format is simply firmware file name. Multiple firmware 276 * files require multiple MODULE_FIRMWARE() specifiers */ 277 #define MODULE_FIRMWARE(_firmware) MODULE_INFO(firmware, _firmware) 278 279 #define MODULE_IMPORT_NS(ns) MODULE_INFO(import_ns, #ns) 280 281 struct notifier_block; 282 283 #ifdef CONFIG_MODULES 284 285 extern int modules_disabled; /* for sysctl */ 286 /* Get/put a kernel symbol (calls must be symmetric) */ 287 void *__symbol_get(const char *symbol); 288 void *__symbol_get_gpl(const char *symbol); 289 #define symbol_get(x) ((typeof(&x))(__symbol_get(__stringify(x)))) 290 291 /* modules using other modules: kdb wants to see this. */ 292 struct module_use { 293 struct list_head source_list; 294 struct list_head target_list; 295 struct module *source, *target; 296 }; 297 298 enum module_state { 299 MODULE_STATE_LIVE, /* Normal state. */ 300 MODULE_STATE_COMING, /* Full formed, running module_init. */ 301 MODULE_STATE_GOING, /* Going away. */ 302 MODULE_STATE_UNFORMED, /* Still setting it up. */ 303 }; 304 305 struct mod_tree_node { 306 struct module *mod; 307 struct latch_tree_node node; 308 }; 309 310 struct module_layout { 311 /* The actual code + data. */ 312 void *base; 313 /* Total size. */ 314 unsigned int size; 315 /* The size of the executable code. */ 316 unsigned int text_size; 317 /* Size of RO section of the module (text+rodata) */ 318 unsigned int ro_size; 319 /* Size of RO after init section */ 320 unsigned int ro_after_init_size; 321 322 #ifdef CONFIG_MODULES_TREE_LOOKUP 323 struct mod_tree_node mtn; 324 #endif 325 }; 326 327 #ifdef CONFIG_MODULES_TREE_LOOKUP 328 /* Only touch one cacheline for common rbtree-for-core-layout case. */ 329 #define __module_layout_align ____cacheline_aligned 330 #else 331 #define __module_layout_align 332 #endif 333 334 struct mod_kallsyms { 335 Elf_Sym *symtab; 336 unsigned int num_symtab; 337 char *strtab; 338 char *typetab; 339 }; 340 341 #ifdef CONFIG_LIVEPATCH 342 struct klp_modinfo { 343 Elf_Ehdr hdr; 344 Elf_Shdr *sechdrs; 345 char *secstrings; 346 unsigned int symndx; 347 }; 348 #endif 349 350 struct module { 351 enum module_state state; 352 353 /* Member of list of modules */ 354 struct list_head list; 355 356 /* Unique handle for this module */ 357 char name[MODULE_NAME_LEN]; 358 359 /* Sysfs stuff. */ 360 struct module_kobject mkobj; 361 struct module_attribute *modinfo_attrs; 362 const char *version; 363 const char *srcversion; 364 struct kobject *holders_dir; 365 366 /* Exported symbols */ 367 const struct kernel_symbol *syms; 368 const s32 *crcs; 369 unsigned int num_syms; 370 371 /* Kernel parameters. */ 372 #ifdef CONFIG_SYSFS 373 struct mutex param_lock; 374 #endif 375 struct kernel_param *kp; 376 unsigned int num_kp; 377 378 /* GPL-only exported symbols. */ 379 unsigned int num_gpl_syms; 380 const struct kernel_symbol *gpl_syms; 381 const s32 *gpl_crcs; 382 383 #ifdef CONFIG_UNUSED_SYMBOLS 384 /* unused exported symbols. */ 385 const struct kernel_symbol *unused_syms; 386 const s32 *unused_crcs; 387 unsigned int num_unused_syms; 388 389 /* GPL-only, unused exported symbols. */ 390 unsigned int num_unused_gpl_syms; 391 const struct kernel_symbol *unused_gpl_syms; 392 const s32 *unused_gpl_crcs; 393 #endif 394 395 #ifdef CONFIG_MODULE_SIG 396 /* Signature was verified. */ 397 bool sig_ok; 398 #endif 399 400 bool async_probe_requested; 401 402 /* symbols that will be GPL-only in the near future. */ 403 const struct kernel_symbol *gpl_future_syms; 404 const s32 *gpl_future_crcs; 405 unsigned int num_gpl_future_syms; 406 407 /* Exception table */ 408 unsigned int num_exentries; 409 struct exception_table_entry *extable; 410 411 /* Startup function. */ 412 int (*init)(void); 413 414 /* Core layout: rbtree is accessed frequently, so keep together. */ 415 struct module_layout core_layout __module_layout_align; 416 struct module_layout init_layout; 417 418 /* Arch-specific module values */ 419 struct mod_arch_specific arch; 420 421 unsigned long taints; /* same bits as kernel:taint_flags */ 422 423 #ifdef CONFIG_GENERIC_BUG 424 /* Support for BUG */ 425 unsigned num_bugs; 426 struct list_head bug_list; 427 struct bug_entry *bug_table; 428 #endif 429 430 #ifdef CONFIG_KALLSYMS 431 /* Protected by RCU and/or module_mutex: use rcu_dereference() */ 432 struct mod_kallsyms *kallsyms; 433 struct mod_kallsyms core_kallsyms; 434 435 /* Section attributes */ 436 struct module_sect_attrs *sect_attrs; 437 438 /* Notes attributes */ 439 struct module_notes_attrs *notes_attrs; 440 #endif 441 442 /* The command line arguments (may be mangled). People like 443 keeping pointers to this stuff */ 444 char *args; 445 446 #ifdef CONFIG_SMP 447 /* Per-cpu data. */ 448 void __percpu *percpu; 449 unsigned int percpu_size; 450 #endif 451 452 #ifdef CONFIG_TRACEPOINTS 453 unsigned int num_tracepoints; 454 tracepoint_ptr_t *tracepoints_ptrs; 455 #endif 456 #ifdef CONFIG_TREE_SRCU 457 unsigned int num_srcu_structs; 458 struct srcu_struct **srcu_struct_ptrs; 459 #endif 460 #ifdef CONFIG_BPF_EVENTS 461 unsigned int num_bpf_raw_events; 462 struct bpf_raw_event_map *bpf_raw_events; 463 #endif 464 #ifdef CONFIG_JUMP_LABEL 465 struct jump_entry *jump_entries; 466 unsigned int num_jump_entries; 467 #endif 468 #ifdef CONFIG_TRACING 469 unsigned int num_trace_bprintk_fmt; 470 const char **trace_bprintk_fmt_start; 471 #endif 472 #ifdef CONFIG_EVENT_TRACING 473 struct trace_event_call **trace_events; 474 unsigned int num_trace_events; 475 struct trace_eval_map **trace_evals; 476 unsigned int num_trace_evals; 477 #endif 478 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 479 unsigned int num_ftrace_callsites; 480 unsigned long *ftrace_callsites; 481 #endif 482 483 #ifdef CONFIG_LIVEPATCH 484 bool klp; /* Is this a livepatch module? */ 485 bool klp_alive; 486 487 /* Elf information */ 488 struct klp_modinfo *klp_info; 489 #endif 490 491 #ifdef CONFIG_MODULE_UNLOAD 492 /* What modules depend on me? */ 493 struct list_head source_list; 494 /* What modules do I depend on? */ 495 struct list_head target_list; 496 497 /* Destruction function. */ 498 void (*exit)(void); 499 500 atomic_t refcnt; 501 #endif 502 503 #ifdef CONFIG_CONSTRUCTORS 504 /* Constructor functions. */ 505 ctor_fn_t *ctors; 506 unsigned int num_ctors; 507 #endif 508 509 #ifdef CONFIG_FUNCTION_ERROR_INJECTION 510 struct error_injection_entry *ei_funcs; 511 unsigned int num_ei_funcs; 512 #endif 513 } ____cacheline_aligned __randomize_layout; 514 #ifndef MODULE_ARCH_INIT 515 #define MODULE_ARCH_INIT {} 516 #endif 517 518 #ifndef HAVE_ARCH_KALLSYMS_SYMBOL_VALUE 519 static inline unsigned long kallsyms_symbol_value(const Elf_Sym *sym) 520 { 521 return sym->st_value; 522 } 523 #endif 524 525 extern struct mutex module_mutex; 526 527 /* FIXME: It'd be nice to isolate modules during init, too, so they 528 aren't used before they (may) fail. But presently too much code 529 (IDE & SCSI) require entry into the module during init.*/ 530 static inline bool module_is_live(struct module *mod) 531 { 532 return mod->state != MODULE_STATE_GOING; 533 } 534 535 struct module *__module_text_address(unsigned long addr); 536 struct module *__module_address(unsigned long addr); 537 bool is_module_address(unsigned long addr); 538 bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr); 539 bool is_module_percpu_address(unsigned long addr); 540 bool is_module_text_address(unsigned long addr); 541 542 static inline bool within_module_core(unsigned long addr, 543 const struct module *mod) 544 { 545 return (unsigned long)mod->core_layout.base <= addr && 546 addr < (unsigned long)mod->core_layout.base + mod->core_layout.size; 547 } 548 549 static inline bool within_module_init(unsigned long addr, 550 const struct module *mod) 551 { 552 return (unsigned long)mod->init_layout.base <= addr && 553 addr < (unsigned long)mod->init_layout.base + mod->init_layout.size; 554 } 555 556 static inline bool within_module(unsigned long addr, const struct module *mod) 557 { 558 return within_module_init(addr, mod) || within_module_core(addr, mod); 559 } 560 561 /* Search for module by name: must hold module_mutex. */ 562 struct module *find_module(const char *name); 563 564 struct symsearch { 565 const struct kernel_symbol *start, *stop; 566 const s32 *crcs; 567 enum { 568 NOT_GPL_ONLY, 569 GPL_ONLY, 570 WILL_BE_GPL_ONLY, 571 } licence; 572 bool unused; 573 }; 574 575 /* 576 * Search for an exported symbol by name. 577 * 578 * Must be called with module_mutex held or preemption disabled. 579 */ 580 const struct kernel_symbol *find_symbol(const char *name, 581 struct module **owner, 582 const s32 **crc, 583 bool gplok, 584 bool warn); 585 586 /* 587 * Walk the exported symbol table 588 * 589 * Must be called with module_mutex held or preemption disabled. 590 */ 591 bool each_symbol_section(bool (*fn)(const struct symsearch *arr, 592 struct module *owner, 593 void *data), void *data); 594 595 /* Returns 0 and fills in value, defined and namebuf, or -ERANGE if 596 symnum out of range. */ 597 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, 598 char *name, char *module_name, int *exported); 599 600 /* Look for this name: can be of form module:name. */ 601 unsigned long module_kallsyms_lookup_name(const char *name); 602 603 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, 604 struct module *, unsigned long), 605 void *data); 606 607 extern void __noreturn __module_put_and_exit(struct module *mod, 608 long code); 609 #define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code) 610 611 #ifdef CONFIG_MODULE_UNLOAD 612 int module_refcount(struct module *mod); 613 void __symbol_put(const char *symbol); 614 #define symbol_put(x) __symbol_put(__stringify(x)) 615 void symbol_put_addr(void *addr); 616 617 /* Sometimes we know we already have a refcount, and it's easier not 618 to handle the error case (which only happens with rmmod --wait). */ 619 extern void __module_get(struct module *module); 620 621 /* This is the Right Way to get a module: if it fails, it's being removed, 622 * so pretend it's not there. */ 623 extern bool try_module_get(struct module *module); 624 625 extern void module_put(struct module *module); 626 627 #else /*!CONFIG_MODULE_UNLOAD*/ 628 static inline bool try_module_get(struct module *module) 629 { 630 return !module || module_is_live(module); 631 } 632 static inline void module_put(struct module *module) 633 { 634 } 635 static inline void __module_get(struct module *module) 636 { 637 } 638 #define symbol_put(x) do { } while (0) 639 #define symbol_put_addr(p) do { } while (0) 640 641 #endif /* CONFIG_MODULE_UNLOAD */ 642 int ref_module(struct module *a, struct module *b); 643 644 /* This is a #define so the string doesn't get put in every .o file */ 645 #define module_name(mod) \ 646 ({ \ 647 struct module *__mod = (mod); \ 648 __mod ? __mod->name : "kernel"; \ 649 }) 650 651 /* Dereference module function descriptor */ 652 void *dereference_module_function_descriptor(struct module *mod, void *ptr); 653 654 /* For kallsyms to ask for address resolution. namebuf should be at 655 * least KSYM_NAME_LEN long: a pointer to namebuf is returned if 656 * found, otherwise NULL. */ 657 const char *module_address_lookup(unsigned long addr, 658 unsigned long *symbolsize, 659 unsigned long *offset, 660 char **modname, 661 char *namebuf); 662 int lookup_module_symbol_name(unsigned long addr, char *symname); 663 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name); 664 665 int register_module_notifier(struct notifier_block *nb); 666 int unregister_module_notifier(struct notifier_block *nb); 667 668 extern void print_modules(void); 669 670 static inline bool module_requested_async_probing(struct module *module) 671 { 672 return module && module->async_probe_requested; 673 } 674 675 #ifdef CONFIG_LIVEPATCH 676 static inline bool is_livepatch_module(struct module *mod) 677 { 678 return mod->klp; 679 } 680 #else /* !CONFIG_LIVEPATCH */ 681 static inline bool is_livepatch_module(struct module *mod) 682 { 683 return false; 684 } 685 #endif /* CONFIG_LIVEPATCH */ 686 687 bool is_module_sig_enforced(void); 688 void set_module_sig_enforced(void); 689 690 #else /* !CONFIG_MODULES... */ 691 692 static inline struct module *__module_address(unsigned long addr) 693 { 694 return NULL; 695 } 696 697 static inline struct module *__module_text_address(unsigned long addr) 698 { 699 return NULL; 700 } 701 702 static inline bool is_module_address(unsigned long addr) 703 { 704 return false; 705 } 706 707 static inline bool is_module_percpu_address(unsigned long addr) 708 { 709 return false; 710 } 711 712 static inline bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) 713 { 714 return false; 715 } 716 717 static inline bool is_module_text_address(unsigned long addr) 718 { 719 return false; 720 } 721 722 static inline bool within_module_core(unsigned long addr, 723 const struct module *mod) 724 { 725 return false; 726 } 727 728 static inline bool within_module_init(unsigned long addr, 729 const struct module *mod) 730 { 731 return false; 732 } 733 734 static inline bool within_module(unsigned long addr, const struct module *mod) 735 { 736 return false; 737 } 738 739 /* Get/put a kernel symbol (calls should be symmetric) */ 740 #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); }) 741 #define symbol_put(x) do { } while (0) 742 #define symbol_put_addr(x) do { } while (0) 743 744 static inline void __module_get(struct module *module) 745 { 746 } 747 748 static inline bool try_module_get(struct module *module) 749 { 750 return true; 751 } 752 753 static inline void module_put(struct module *module) 754 { 755 } 756 757 #define module_name(mod) "kernel" 758 759 /* For kallsyms to ask for address resolution. NULL means not found. */ 760 static inline const char *module_address_lookup(unsigned long addr, 761 unsigned long *symbolsize, 762 unsigned long *offset, 763 char **modname, 764 char *namebuf) 765 { 766 return NULL; 767 } 768 769 static inline int lookup_module_symbol_name(unsigned long addr, char *symname) 770 { 771 return -ERANGE; 772 } 773 774 static inline int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name) 775 { 776 return -ERANGE; 777 } 778 779 static inline int module_get_kallsym(unsigned int symnum, unsigned long *value, 780 char *type, char *name, 781 char *module_name, int *exported) 782 { 783 return -ERANGE; 784 } 785 786 static inline unsigned long module_kallsyms_lookup_name(const char *name) 787 { 788 return 0; 789 } 790 791 static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, 792 struct module *, 793 unsigned long), 794 void *data) 795 { 796 return 0; 797 } 798 799 static inline int register_module_notifier(struct notifier_block *nb) 800 { 801 /* no events will happen anyway, so this can always succeed */ 802 return 0; 803 } 804 805 static inline int unregister_module_notifier(struct notifier_block *nb) 806 { 807 return 0; 808 } 809 810 #define module_put_and_exit(code) do_exit(code) 811 812 static inline void print_modules(void) 813 { 814 } 815 816 static inline bool module_requested_async_probing(struct module *module) 817 { 818 return false; 819 } 820 821 static inline bool is_module_sig_enforced(void) 822 { 823 return false; 824 } 825 826 static inline void set_module_sig_enforced(void) 827 { 828 } 829 830 /* Dereference module function descriptor */ 831 static inline 832 void *dereference_module_function_descriptor(struct module *mod, void *ptr) 833 { 834 return ptr; 835 } 836 837 #endif /* CONFIG_MODULES */ 838 839 #ifdef CONFIG_SYSFS 840 extern struct kset *module_kset; 841 extern struct kobj_type module_ktype; 842 extern int module_sysfs_initialized; 843 #endif /* CONFIG_SYSFS */ 844 845 #define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x) 846 847 /* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */ 848 849 #define __MODULE_STRING(x) __stringify(x) 850 851 #ifdef CONFIG_STRICT_MODULE_RWX 852 extern void set_all_modules_text_rw(void); 853 extern void set_all_modules_text_ro(void); 854 extern void module_enable_ro(const struct module *mod, bool after_init); 855 extern void module_disable_ro(const struct module *mod); 856 #else 857 static inline void set_all_modules_text_rw(void) { } 858 static inline void set_all_modules_text_ro(void) { } 859 static inline void module_enable_ro(const struct module *mod, bool after_init) { } 860 static inline void module_disable_ro(const struct module *mod) { } 861 #endif 862 863 #ifdef CONFIG_GENERIC_BUG 864 void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *, 865 struct module *); 866 void module_bug_cleanup(struct module *); 867 868 #else /* !CONFIG_GENERIC_BUG */ 869 870 static inline void module_bug_finalize(const Elf_Ehdr *hdr, 871 const Elf_Shdr *sechdrs, 872 struct module *mod) 873 { 874 } 875 static inline void module_bug_cleanup(struct module *mod) {} 876 #endif /* CONFIG_GENERIC_BUG */ 877 878 #ifdef CONFIG_RETPOLINE 879 extern bool retpoline_module_ok(bool has_retpoline); 880 #else 881 static inline bool retpoline_module_ok(bool has_retpoline) 882 { 883 return true; 884 } 885 #endif 886 887 #ifdef CONFIG_MODULE_SIG 888 static inline bool module_sig_ok(struct module *module) 889 { 890 return module->sig_ok; 891 } 892 #else /* !CONFIG_MODULE_SIG */ 893 static inline bool module_sig_ok(struct module *module) 894 { 895 return true; 896 } 897 #endif /* CONFIG_MODULE_SIG */ 898 899 #endif /* _LINUX_MODULE_H */ 900