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