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, __stringify(ns)) 294 295 struct notifier_block; 296 297 #ifdef CONFIG_MODULES 298 299 extern int modules_disabled; /* for sysctl */ 300 /* Get/put a kernel symbol (calls must be symmetric) */ 301 void *__symbol_get(const char *symbol); 302 void *__symbol_get_gpl(const char *symbol); 303 #define symbol_get(x) ((typeof(&x))(__symbol_get(__stringify(x)))) 304 305 /* modules using other modules: kdb wants to see this. */ 306 struct module_use { 307 struct list_head source_list; 308 struct list_head target_list; 309 struct module *source, *target; 310 }; 311 312 enum module_state { 313 MODULE_STATE_LIVE, /* Normal state. */ 314 MODULE_STATE_COMING, /* Full formed, running module_init. */ 315 MODULE_STATE_GOING, /* Going away. */ 316 MODULE_STATE_UNFORMED, /* Still setting it up. */ 317 }; 318 319 struct mod_tree_node { 320 struct module *mod; 321 struct latch_tree_node node; 322 }; 323 324 struct module_layout { 325 /* The actual code + data. */ 326 void *base; 327 /* Total size. */ 328 unsigned int size; 329 /* The size of the executable code. */ 330 unsigned int text_size; 331 /* Size of RO section of the module (text+rodata) */ 332 unsigned int ro_size; 333 /* Size of RO after init section */ 334 unsigned int ro_after_init_size; 335 336 #ifdef CONFIG_MODULES_TREE_LOOKUP 337 struct mod_tree_node mtn; 338 #endif 339 }; 340 341 #ifdef CONFIG_MODULES_TREE_LOOKUP 342 /* Only touch one cacheline for common rbtree-for-core-layout case. */ 343 #define __module_layout_align ____cacheline_aligned 344 #else 345 #define __module_layout_align 346 #endif 347 348 struct mod_kallsyms { 349 Elf_Sym *symtab; 350 unsigned int num_symtab; 351 char *strtab; 352 char *typetab; 353 }; 354 355 #ifdef CONFIG_LIVEPATCH 356 struct klp_modinfo { 357 Elf_Ehdr hdr; 358 Elf_Shdr *sechdrs; 359 char *secstrings; 360 unsigned int symndx; 361 }; 362 #endif 363 364 struct module { 365 enum module_state state; 366 367 /* Member of list of modules */ 368 struct list_head list; 369 370 /* Unique handle for this module */ 371 char name[MODULE_NAME_LEN]; 372 373 #ifdef CONFIG_STACKTRACE_BUILD_ID 374 /* Module build ID */ 375 unsigned char build_id[BUILD_ID_SIZE_MAX]; 376 #endif 377 378 /* Sysfs stuff. */ 379 struct module_kobject mkobj; 380 struct module_attribute *modinfo_attrs; 381 const char *version; 382 const char *srcversion; 383 struct kobject *holders_dir; 384 385 /* Exported symbols */ 386 const struct kernel_symbol *syms; 387 const s32 *crcs; 388 unsigned int num_syms; 389 390 #ifdef CONFIG_CFI_CLANG 391 cfi_check_fn cfi_check; 392 #endif 393 394 /* Kernel parameters. */ 395 #ifdef CONFIG_SYSFS 396 struct mutex param_lock; 397 #endif 398 struct kernel_param *kp; 399 unsigned int num_kp; 400 401 /* GPL-only exported symbols. */ 402 unsigned int num_gpl_syms; 403 const struct kernel_symbol *gpl_syms; 404 const s32 *gpl_crcs; 405 bool using_gplonly_symbols; 406 407 #ifdef CONFIG_MODULE_SIG 408 /* Signature was verified. */ 409 bool sig_ok; 410 #endif 411 412 bool async_probe_requested; 413 414 /* Exception table */ 415 unsigned int num_exentries; 416 struct exception_table_entry *extable; 417 418 /* Startup function. */ 419 int (*init)(void); 420 421 /* Core layout: rbtree is accessed frequently, so keep together. */ 422 struct module_layout core_layout __module_layout_align; 423 struct module_layout init_layout; 424 #ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC 425 struct module_layout data_layout; 426 #endif 427 428 /* Arch-specific module values */ 429 struct mod_arch_specific arch; 430 431 unsigned long taints; /* same bits as kernel:taint_flags */ 432 433 #ifdef CONFIG_GENERIC_BUG 434 /* Support for BUG */ 435 unsigned num_bugs; 436 struct list_head bug_list; 437 struct bug_entry *bug_table; 438 #endif 439 440 #ifdef CONFIG_KALLSYMS 441 /* Protected by RCU and/or module_mutex: use rcu_dereference() */ 442 struct mod_kallsyms __rcu *kallsyms; 443 struct mod_kallsyms core_kallsyms; 444 445 /* Section attributes */ 446 struct module_sect_attrs *sect_attrs; 447 448 /* Notes attributes */ 449 struct module_notes_attrs *notes_attrs; 450 #endif 451 452 /* The command line arguments (may be mangled). People like 453 keeping pointers to this stuff */ 454 char *args; 455 456 #ifdef CONFIG_SMP 457 /* Per-cpu data. */ 458 void __percpu *percpu; 459 unsigned int percpu_size; 460 #endif 461 void *noinstr_text_start; 462 unsigned int noinstr_text_size; 463 464 #ifdef CONFIG_TRACEPOINTS 465 unsigned int num_tracepoints; 466 tracepoint_ptr_t *tracepoints_ptrs; 467 #endif 468 #ifdef CONFIG_TREE_SRCU 469 unsigned int num_srcu_structs; 470 struct srcu_struct **srcu_struct_ptrs; 471 #endif 472 #ifdef CONFIG_BPF_EVENTS 473 unsigned int num_bpf_raw_events; 474 struct bpf_raw_event_map *bpf_raw_events; 475 #endif 476 #ifdef CONFIG_DEBUG_INFO_BTF_MODULES 477 unsigned int btf_data_size; 478 void *btf_data; 479 #endif 480 #ifdef CONFIG_JUMP_LABEL 481 struct jump_entry *jump_entries; 482 unsigned int num_jump_entries; 483 #endif 484 #ifdef CONFIG_TRACING 485 unsigned int num_trace_bprintk_fmt; 486 const char **trace_bprintk_fmt_start; 487 #endif 488 #ifdef CONFIG_EVENT_TRACING 489 struct trace_event_call **trace_events; 490 unsigned int num_trace_events; 491 struct trace_eval_map **trace_evals; 492 unsigned int num_trace_evals; 493 #endif 494 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 495 unsigned int num_ftrace_callsites; 496 unsigned long *ftrace_callsites; 497 #endif 498 #ifdef CONFIG_KPROBES 499 void *kprobes_text_start; 500 unsigned int kprobes_text_size; 501 unsigned long *kprobe_blacklist; 502 unsigned int num_kprobe_blacklist; 503 #endif 504 #ifdef CONFIG_HAVE_STATIC_CALL_INLINE 505 int num_static_call_sites; 506 struct static_call_site *static_call_sites; 507 #endif 508 509 #ifdef CONFIG_LIVEPATCH 510 bool klp; /* Is this a livepatch module? */ 511 bool klp_alive; 512 513 /* Elf information */ 514 struct klp_modinfo *klp_info; 515 #endif 516 517 #ifdef CONFIG_PRINTK_INDEX 518 unsigned int printk_index_size; 519 struct pi_entry **printk_index_start; 520 #endif 521 522 #ifdef CONFIG_MODULE_UNLOAD 523 /* What modules depend on me? */ 524 struct list_head source_list; 525 /* What modules do I depend on? */ 526 struct list_head target_list; 527 528 /* Destruction function. */ 529 void (*exit)(void); 530 531 atomic_t refcnt; 532 #endif 533 534 #ifdef CONFIG_CONSTRUCTORS 535 /* Constructor functions. */ 536 ctor_fn_t *ctors; 537 unsigned int num_ctors; 538 #endif 539 540 #ifdef CONFIG_FUNCTION_ERROR_INJECTION 541 struct error_injection_entry *ei_funcs; 542 unsigned int num_ei_funcs; 543 #endif 544 } ____cacheline_aligned __randomize_layout; 545 #ifndef MODULE_ARCH_INIT 546 #define MODULE_ARCH_INIT {} 547 #endif 548 549 #ifndef HAVE_ARCH_KALLSYMS_SYMBOL_VALUE 550 static inline unsigned long kallsyms_symbol_value(const Elf_Sym *sym) 551 { 552 return sym->st_value; 553 } 554 #endif 555 556 /* FIXME: It'd be nice to isolate modules during init, too, so they 557 aren't used before they (may) fail. But presently too much code 558 (IDE & SCSI) require entry into the module during init.*/ 559 static inline bool module_is_live(struct module *mod) 560 { 561 return mod->state != MODULE_STATE_GOING; 562 } 563 564 struct module *__module_text_address(unsigned long addr); 565 struct module *__module_address(unsigned long addr); 566 bool is_module_address(unsigned long addr); 567 bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr); 568 bool is_module_percpu_address(unsigned long addr); 569 bool is_module_text_address(unsigned long addr); 570 571 static inline bool within_module_core(unsigned long addr, 572 const struct module *mod) 573 { 574 #ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC 575 if ((unsigned long)mod->data_layout.base <= addr && 576 addr < (unsigned long)mod->data_layout.base + mod->data_layout.size) 577 return true; 578 #endif 579 return (unsigned long)mod->core_layout.base <= addr && 580 addr < (unsigned long)mod->core_layout.base + mod->core_layout.size; 581 } 582 583 static inline bool within_module_init(unsigned long addr, 584 const struct module *mod) 585 { 586 return (unsigned long)mod->init_layout.base <= addr && 587 addr < (unsigned long)mod->init_layout.base + mod->init_layout.size; 588 } 589 590 static inline bool within_module(unsigned long addr, const struct module *mod) 591 { 592 return within_module_init(addr, mod) || within_module_core(addr, mod); 593 } 594 595 /* Search for module by name: must be in a RCU-sched critical section. */ 596 struct module *find_module(const char *name); 597 598 /* Returns 0 and fills in value, defined and namebuf, or -ERANGE if 599 symnum out of range. */ 600 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, 601 char *name, char *module_name, int *exported); 602 603 /* Look for this name: can be of form module:name. */ 604 unsigned long module_kallsyms_lookup_name(const char *name); 605 606 extern void __noreturn __module_put_and_kthread_exit(struct module *mod, 607 long code); 608 #define module_put_and_kthread_exit(code) __module_put_and_kthread_exit(THIS_MODULE, code) 609 610 #ifdef CONFIG_MODULE_UNLOAD 611 int module_refcount(struct module *mod); 612 void __symbol_put(const char *symbol); 613 #define symbol_put(x) __symbol_put(__stringify(x)) 614 void symbol_put_addr(void *addr); 615 616 /* Sometimes we know we already have a refcount, and it's easier not 617 to handle the error case (which only happens with rmmod --wait). */ 618 extern void __module_get(struct module *module); 619 620 /* This is the Right Way to get a module: if it fails, it's being removed, 621 * so pretend it's not there. */ 622 extern bool try_module_get(struct module *module); 623 624 extern void module_put(struct module *module); 625 626 #else /*!CONFIG_MODULE_UNLOAD*/ 627 static inline bool try_module_get(struct module *module) 628 { 629 return !module || module_is_live(module); 630 } 631 static inline void module_put(struct module *module) 632 { 633 } 634 static inline void __module_get(struct module *module) 635 { 636 } 637 #define symbol_put(x) do { } while (0) 638 #define symbol_put_addr(p) do { } while (0) 639 640 #endif /* CONFIG_MODULE_UNLOAD */ 641 642 /* This is a #define so the string doesn't get put in every .o file */ 643 #define module_name(mod) \ 644 ({ \ 645 struct module *__mod = (mod); \ 646 __mod ? __mod->name : "kernel"; \ 647 }) 648 649 /* Dereference module function descriptor */ 650 void *dereference_module_function_descriptor(struct module *mod, void *ptr); 651 652 /* For kallsyms to ask for address resolution. namebuf should be at 653 * least KSYM_NAME_LEN long: a pointer to namebuf is returned if 654 * found, otherwise NULL. */ 655 const char *module_address_lookup(unsigned long addr, 656 unsigned long *symbolsize, 657 unsigned long *offset, 658 char **modname, const unsigned char **modbuildid, 659 char *namebuf); 660 int lookup_module_symbol_name(unsigned long addr, char *symname); 661 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name); 662 663 int register_module_notifier(struct notifier_block *nb); 664 int unregister_module_notifier(struct notifier_block *nb); 665 666 extern void print_modules(void); 667 668 static inline bool module_requested_async_probing(struct module *module) 669 { 670 return module && module->async_probe_requested; 671 } 672 673 static inline bool is_livepatch_module(struct module *mod) 674 { 675 #ifdef CONFIG_LIVEPATCH 676 return mod->klp; 677 #else 678 return false; 679 #endif 680 } 681 682 void set_module_sig_enforced(void); 683 684 #else /* !CONFIG_MODULES... */ 685 686 static inline struct module *__module_address(unsigned long addr) 687 { 688 return NULL; 689 } 690 691 static inline struct module *__module_text_address(unsigned long addr) 692 { 693 return NULL; 694 } 695 696 static inline bool is_module_address(unsigned long addr) 697 { 698 return false; 699 } 700 701 static inline bool is_module_percpu_address(unsigned long addr) 702 { 703 return false; 704 } 705 706 static inline bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) 707 { 708 return false; 709 } 710 711 static inline bool is_module_text_address(unsigned long addr) 712 { 713 return false; 714 } 715 716 static inline bool within_module_core(unsigned long addr, 717 const struct module *mod) 718 { 719 return false; 720 } 721 722 static inline bool within_module_init(unsigned long addr, 723 const struct module *mod) 724 { 725 return false; 726 } 727 728 static inline bool within_module(unsigned long addr, const struct module *mod) 729 { 730 return false; 731 } 732 733 /* Get/put a kernel symbol (calls should be symmetric) */ 734 #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak,visibility("hidden"))); &(x); }) 735 #define symbol_put(x) do { } while (0) 736 #define symbol_put_addr(x) do { } while (0) 737 738 static inline void __module_get(struct module *module) 739 { 740 } 741 742 static inline bool try_module_get(struct module *module) 743 { 744 return true; 745 } 746 747 static inline void module_put(struct module *module) 748 { 749 } 750 751 #define module_name(mod) "kernel" 752 753 /* For kallsyms to ask for address resolution. NULL means not found. */ 754 static inline const char *module_address_lookup(unsigned long addr, 755 unsigned long *symbolsize, 756 unsigned long *offset, 757 char **modname, 758 const unsigned char **modbuildid, 759 char *namebuf) 760 { 761 return NULL; 762 } 763 764 static inline int lookup_module_symbol_name(unsigned long addr, char *symname) 765 { 766 return -ERANGE; 767 } 768 769 static inline int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name) 770 { 771 return -ERANGE; 772 } 773 774 static inline int module_get_kallsym(unsigned int symnum, unsigned long *value, 775 char *type, char *name, 776 char *module_name, int *exported) 777 { 778 return -ERANGE; 779 } 780 781 static inline unsigned long module_kallsyms_lookup_name(const char *name) 782 { 783 return 0; 784 } 785 786 static inline int register_module_notifier(struct notifier_block *nb) 787 { 788 /* no events will happen anyway, so this can always succeed */ 789 return 0; 790 } 791 792 static inline int unregister_module_notifier(struct notifier_block *nb) 793 { 794 return 0; 795 } 796 797 #define module_put_and_kthread_exit(code) kthread_exit(code) 798 799 static inline void print_modules(void) 800 { 801 } 802 803 static inline bool module_requested_async_probing(struct module *module) 804 { 805 return false; 806 } 807 808 809 static inline void set_module_sig_enforced(void) 810 { 811 } 812 813 /* Dereference module function descriptor */ 814 static inline 815 void *dereference_module_function_descriptor(struct module *mod, void *ptr) 816 { 817 return ptr; 818 } 819 820 #endif /* CONFIG_MODULES */ 821 822 #ifdef CONFIG_SYSFS 823 extern struct kset *module_kset; 824 extern struct kobj_type module_ktype; 825 extern int module_sysfs_initialized; 826 #endif /* CONFIG_SYSFS */ 827 828 #define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x) 829 830 /* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */ 831 832 #define __MODULE_STRING(x) __stringify(x) 833 834 #ifdef CONFIG_GENERIC_BUG 835 void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *, 836 struct module *); 837 void module_bug_cleanup(struct module *); 838 839 #else /* !CONFIG_GENERIC_BUG */ 840 841 static inline void module_bug_finalize(const Elf_Ehdr *hdr, 842 const Elf_Shdr *sechdrs, 843 struct module *mod) 844 { 845 } 846 static inline void module_bug_cleanup(struct module *mod) {} 847 #endif /* CONFIG_GENERIC_BUG */ 848 849 #ifdef CONFIG_RETPOLINE 850 extern bool retpoline_module_ok(bool has_retpoline); 851 #else 852 static inline bool retpoline_module_ok(bool has_retpoline) 853 { 854 return true; 855 } 856 #endif 857 858 #ifdef CONFIG_MODULE_SIG 859 bool is_module_sig_enforced(void); 860 861 static inline bool module_sig_ok(struct module *module) 862 { 863 return module->sig_ok; 864 } 865 #else /* !CONFIG_MODULE_SIG */ 866 static inline bool is_module_sig_enforced(void) 867 { 868 return false; 869 } 870 871 static inline bool module_sig_ok(struct module *module) 872 { 873 return true; 874 } 875 #endif /* CONFIG_MODULE_SIG */ 876 877 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, 878 struct module *, unsigned long), 879 void *data); 880 881 #endif /* _LINUX_MODULE_H */ 882