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