include/linux/module.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Dynamic loading of modules into the kernel.
   4  *
   5  * Rewritten by Richard Henderson <rth@tamu.edu> 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 module_enable_ro(const struct module *mod, bool after_init);
 853 extern void module_disable_ro(const struct module *mod);
 854 #else
 855 static inline void module_enable_ro(const struct module *mod, bool after_init) { }
 856 static inline void module_disable_ro(const struct module *mod) { }
 857 #endif
 858
 859 #ifdef CONFIG_GENERIC_BUG
 860 void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
 861                          struct module *);
 862 void module_bug_cleanup(struct module *);
 863
 864 #else   /* !CONFIG_GENERIC_BUG */
 865
 866 static inline void module_bug_finalize(const Elf_Ehdr *hdr,
 867                                         const Elf_Shdr *sechdrs,
 868                                         struct module *mod)
 869 {
 870 }
 871 static inline void module_bug_cleanup(struct module *mod) {}
 872 #endif  /* CONFIG_GENERIC_BUG */
 873
 874 #ifdef CONFIG_RETPOLINE
 875 extern bool retpoline_module_ok(bool has_retpoline);
 876 #else
 877 static inline bool retpoline_module_ok(bool has_retpoline)
 878 {
 879         return true;
 880 }
 881 #endif
 882
 883 #ifdef CONFIG_MODULE_SIG
 884 static inline bool module_sig_ok(struct module *module)
 885 {
 886         return module->sig_ok;
 887 }
 888 #else   /* !CONFIG_MODULE_SIG */
 889 static inline bool module_sig_ok(struct module *module)
 890 {
 891         return true;
 892 }
 893 #endif  /* CONFIG_MODULE_SIG */
 894
 895 #endif /* _LINUX_MODULE_H */