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  * MODULE_FILE is used for generating modules.builtin
 174  * So, make it no-op when this is being built as a module
 175  */
 176 #ifdef MODULE
 177 #define MODULE_FILE
 178 #else
 179 #define MODULE_FILE     MODULE_INFO(file, KBUILD_MODFILE);
 180 #endif
 181
 182 /*
 183  * The following license idents are currently accepted as indicating free
 184  * software modules
 185  *
 186  *      "GPL"                           [GNU Public License v2]
 187  *      "GPL v2"                        [GNU Public License v2]
 188  *      "GPL and additional rights"     [GNU Public License v2 rights and more]
 189  *      "Dual BSD/GPL"                  [GNU Public License v2
 190  *                                       or BSD license choice]
 191  *      "Dual MIT/GPL"                  [GNU Public License v2
 192  *                                       or MIT license choice]
 193  *      "Dual MPL/GPL"                  [GNU Public License v2
 194  *                                       or Mozilla license choice]
 195  *
 196  * The following other idents are available
 197  *
 198  *      "Proprietary"                   [Non free products]
 199  *
 200  * Both "GPL v2" and "GPL" (the latter also in dual licensed strings) are
 201  * merely stating that the module is licensed under the GPL v2, but are not
 202  * telling whether "GPL v2 only" or "GPL v2 or later". The reason why there
 203  * are two variants is a historic and failed attempt to convey more
 204  * information in the MODULE_LICENSE string. For module loading the
 205  * "only/or later" distinction is completely irrelevant and does neither
 206  * replace the proper license identifiers in the corresponding source file
 207  * nor amends them in any way. The sole purpose is to make the
 208  * 'Proprietary' flagging work and to refuse to bind symbols which are
 209  * exported with EXPORT_SYMBOL_GPL when a non free module is loaded.
 210  *
 211  * In the same way "BSD" is not a clear license information. It merely
 212  * states, that the module is licensed under one of the compatible BSD
 213  * license variants. The detailed and correct license information is again
 214  * to be found in the corresponding source files.
 215  *
 216  * There are dual licensed components, but when running with Linux it is the
 217  * GPL that is relevant so this is a non issue. Similarly LGPL linked with GPL
 218  * is a GPL combined work.
 219  *
 220  * This exists for several reasons
 221  * 1.   So modinfo can show license info for users wanting to vet their setup
 222  *      is free
 223  * 2.   So the community can ignore bug reports including proprietary modules
 224  * 3.   So vendors can do likewise based on their own policies
 225  */
 226 #define MODULE_LICENSE(_license) MODULE_FILE MODULE_INFO(license, _license)
 227
 228 /*
 229  * Author(s), use "Name <email>" or just "Name", for multiple
 230  * authors use multiple MODULE_AUTHOR() statements/lines.
 231  */
 232 #define MODULE_AUTHOR(_author) MODULE_INFO(author, _author)
 233
 234 /* What your module does. */
 235 #define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description)
 236
 237 #ifdef MODULE
 238 /* Creates an alias so file2alias.c can find device table. */
 239 #define MODULE_DEVICE_TABLE(type, name)                                 \
 240 extern typeof(name) __mod_##type##__##name##_device_table               \
 241   __attribute__ ((unused, alias(__stringify(name))))
 242 #else  /* !MODULE */
 243 #define MODULE_DEVICE_TABLE(type, name)
 244 #endif
 245
 246 /* Version of form [<epoch>:]<version>[-<extra-version>].
 247  * Or for CVS/RCS ID version, everything but the number is stripped.
 248  * <epoch>: A (small) unsigned integer which allows you to start versions
 249  * anew. If not mentioned, it's zero.  eg. "2:1.0" is after
 250  * "1:2.0".
 251
 252  * <version>: The <version> may contain only alphanumerics and the
 253  * character `.'.  Ordered by numeric sort for numeric parts,
 254  * ascii sort for ascii parts (as per RPM or DEB algorithm).
 255
 256  * <extraversion>: Like <version>, but inserted for local
 257  * customizations, eg "rh3" or "rusty1".
 258
 259  * Using this automatically adds a checksum of the .c files and the
 260  * local headers in "srcversion".
 261  */
 262
 263 #if defined(MODULE) || !defined(CONFIG_SYSFS)
 264 #define MODULE_VERSION(_version) MODULE_INFO(version, _version)
 265 #else
 266 #define MODULE_VERSION(_version)                                        \
 267         MODULE_INFO(version, _version);                                 \
 268         static struct module_version_attribute ___modver_attr = {       \
 269                 .mattr  = {                                             \
 270                         .attr   = {                                     \
 271                                 .name   = "version",                    \
 272                                 .mode   = S_IRUGO,                      \
 273                         },                                              \
 274                         .show   = __modver_version_show,                \
 275                 },                                                      \
 276                 .module_name    = KBUILD_MODNAME,                       \
 277                 .version        = _version,                             \
 278         };                                                              \
 279         static const struct module_version_attribute                    \
 280         __used __attribute__ ((__section__ ("__modver")))               \
 281         * __moduleparam_const __modver_attr = &___modver_attr
 282 #endif
 283
 284 /* Optional firmware file (or files) needed by the module
 285  * format is simply firmware file name.  Multiple firmware
 286  * files require multiple MODULE_FIRMWARE() specifiers */
 287 #define MODULE_FIRMWARE(_firmware) MODULE_INFO(firmware, _firmware)
 288
 289 #define MODULE_IMPORT_NS(ns) MODULE_INFO(import_ns, #ns)
 290
 291 struct notifier_block;
 292
 293 #ifdef CONFIG_MODULES
 294
 295 extern int modules_disabled; /* for sysctl */
 296 /* Get/put a kernel symbol (calls must be symmetric) */
 297 void *__symbol_get(const char *symbol);
 298 void *__symbol_get_gpl(const char *symbol);
 299 #define symbol_get(x) ((typeof(&x))(__symbol_get(__stringify(x))))
 300
 301 /* modules using other modules: kdb wants to see this. */
 302 struct module_use {
 303         struct list_head source_list;
 304         struct list_head target_list;
 305         struct module *source, *target;
 306 };
 307
 308 enum module_state {
 309         MODULE_STATE_LIVE,      /* Normal state. */
 310         MODULE_STATE_COMING,    /* Full formed, running module_init. */
 311         MODULE_STATE_GOING,     /* Going away. */
 312         MODULE_STATE_UNFORMED,  /* Still setting it up. */
 313 };
 314
 315 struct mod_tree_node {
 316         struct module *mod;
 317         struct latch_tree_node node;
 318 };
 319
 320 struct module_layout {
 321         /* The actual code + data. */
 322         void *base;
 323         /* Total size. */
 324         unsigned int size;
 325         /* The size of the executable code.  */
 326         unsigned int text_size;
 327         /* Size of RO section of the module (text+rodata) */
 328         unsigned int ro_size;
 329         /* Size of RO after init section */
 330         unsigned int ro_after_init_size;
 331
 332 #ifdef CONFIG_MODULES_TREE_LOOKUP
 333         struct mod_tree_node mtn;
 334 #endif
 335 };
 336
 337 #ifdef CONFIG_MODULES_TREE_LOOKUP
 338 /* Only touch one cacheline for common rbtree-for-core-layout case. */
 339 #define __module_layout_align ____cacheline_aligned
 340 #else
 341 #define __module_layout_align
 342 #endif
 343
 344 struct mod_kallsyms {
 345         Elf_Sym *symtab;
 346         unsigned int num_symtab;
 347         char *strtab;
 348         char *typetab;
 349 };
 350
 351 #ifdef CONFIG_LIVEPATCH
 352 struct klp_modinfo {
 353         Elf_Ehdr hdr;
 354         Elf_Shdr *sechdrs;
 355         char *secstrings;
 356         unsigned int symndx;
 357 };
 358 #endif
 359
 360 struct module {
 361         enum module_state state;
 362
 363         /* Member of list of modules */
 364         struct list_head list;
 365
 366         /* Unique handle for this module */
 367         char name[MODULE_NAME_LEN];
 368
 369         /* Sysfs stuff. */
 370         struct module_kobject mkobj;
 371         struct module_attribute *modinfo_attrs;
 372         const char *version;
 373         const char *srcversion;
 374         struct kobject *holders_dir;
 375
 376         /* Exported symbols */
 377         const struct kernel_symbol *syms;
 378         const s32 *crcs;
 379         unsigned int num_syms;
 380
 381         /* Kernel parameters. */
 382 #ifdef CONFIG_SYSFS
 383         struct mutex param_lock;
 384 #endif
 385         struct kernel_param *kp;
 386         unsigned int num_kp;
 387
 388         /* GPL-only exported symbols. */
 389         unsigned int num_gpl_syms;
 390         const struct kernel_symbol *gpl_syms;
 391         const s32 *gpl_crcs;
 392         bool using_gplonly_symbols;
 393
 394 #ifdef CONFIG_UNUSED_SYMBOLS
 395         /* unused exported symbols. */
 396         const struct kernel_symbol *unused_syms;
 397         const s32 *unused_crcs;
 398         unsigned int num_unused_syms;
 399
 400         /* GPL-only, unused exported symbols. */
 401         unsigned int num_unused_gpl_syms;
 402         const struct kernel_symbol *unused_gpl_syms;
 403         const s32 *unused_gpl_crcs;
 404 #endif
 405
 406 #ifdef CONFIG_MODULE_SIG
 407         /* Signature was verified. */
 408         bool sig_ok;
 409 #endif
 410
 411         bool async_probe_requested;
 412
 413         /* symbols that will be GPL-only in the near future. */
 414         const struct kernel_symbol *gpl_future_syms;
 415         const s32 *gpl_future_crcs;
 416         unsigned int num_gpl_future_syms;
 417
 418         /* Exception table */
 419         unsigned int num_exentries;
 420         struct exception_table_entry *extable;
 421
 422         /* Startup function. */
 423         int (*init)(void);
 424
 425         /* Core layout: rbtree is accessed frequently, so keep together. */
 426         struct module_layout core_layout __module_layout_align;
 427         struct module_layout init_layout;
 428
 429         /* Arch-specific module values */
 430         struct mod_arch_specific arch;
 431
 432         unsigned long taints;   /* same bits as kernel:taint_flags */
 433
 434 #ifdef CONFIG_GENERIC_BUG
 435         /* Support for BUG */
 436         unsigned num_bugs;
 437         struct list_head bug_list;
 438         struct bug_entry *bug_table;
 439 #endif
 440
 441 #ifdef CONFIG_KALLSYMS
 442         /* Protected by RCU and/or module_mutex: use rcu_dereference() */
 443         struct mod_kallsyms __rcu *kallsyms;
 444         struct mod_kallsyms core_kallsyms;
 445
 446         /* Section attributes */
 447         struct module_sect_attrs *sect_attrs;
 448
 449         /* Notes attributes */
 450         struct module_notes_attrs *notes_attrs;
 451 #endif
 452
 453         /* The command line arguments (may be mangled).  People like
 454            keeping pointers to this stuff */
 455         char *args;
 456
 457 #ifdef CONFIG_SMP
 458         /* Per-cpu data. */
 459         void __percpu *percpu;
 460         unsigned int percpu_size;
 461 #endif
 462         void *noinstr_text_start;
 463         unsigned int noinstr_text_size;
 464
 465 #ifdef CONFIG_TRACEPOINTS
 466         unsigned int num_tracepoints;
 467         tracepoint_ptr_t *tracepoints_ptrs;
 468 #endif
 469 #ifdef CONFIG_TREE_SRCU
 470         unsigned int num_srcu_structs;
 471         struct srcu_struct **srcu_struct_ptrs;
 472 #endif
 473 #ifdef CONFIG_BPF_EVENTS
 474         unsigned int num_bpf_raw_events;
 475         struct bpf_raw_event_map *bpf_raw_events;
 476 #endif
 477 #ifdef CONFIG_JUMP_LABEL
 478         struct jump_entry *jump_entries;
 479         unsigned int num_jump_entries;
 480 #endif
 481 #ifdef CONFIG_TRACING
 482         unsigned int num_trace_bprintk_fmt;
 483         const char **trace_bprintk_fmt_start;
 484 #endif
 485 #ifdef CONFIG_EVENT_TRACING
 486         struct trace_event_call **trace_events;
 487         unsigned int num_trace_events;
 488         struct trace_eval_map **trace_evals;
 489         unsigned int num_trace_evals;
 490 #endif
 491 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 492         unsigned int num_ftrace_callsites;
 493         unsigned long *ftrace_callsites;
 494 #endif
 495 #ifdef CONFIG_KPROBES
 496         void *kprobes_text_start;
 497         unsigned int kprobes_text_size;
 498         unsigned long *kprobe_blacklist;
 499         unsigned int num_kprobe_blacklist;
 500 #endif
 501
 502 #ifdef CONFIG_LIVEPATCH
 503         bool klp; /* Is this a livepatch module? */
 504         bool klp_alive;
 505
 506         /* Elf information */
 507         struct klp_modinfo *klp_info;
 508 #endif
 509
 510 #ifdef CONFIG_MODULE_UNLOAD
 511         /* What modules depend on me? */
 512         struct list_head source_list;
 513         /* What modules do I depend on? */
 514         struct list_head target_list;
 515
 516         /* Destruction function. */
 517         void (*exit)(void);
 518
 519         atomic_t refcnt;
 520 #endif
 521
 522 #ifdef CONFIG_CONSTRUCTORS
 523         /* Constructor functions. */
 524         ctor_fn_t *ctors;
 525         unsigned int num_ctors;
 526 #endif
 527
 528 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
 529         struct error_injection_entry *ei_funcs;
 530         unsigned int num_ei_funcs;
 531 #endif
 532 } ____cacheline_aligned __randomize_layout;
 533 #ifndef MODULE_ARCH_INIT
 534 #define MODULE_ARCH_INIT {}
 535 #endif
 536
 537 #ifndef HAVE_ARCH_KALLSYMS_SYMBOL_VALUE
 538 static inline unsigned long kallsyms_symbol_value(const Elf_Sym *sym)
 539 {
 540         return sym->st_value;
 541 }
 542 #endif
 543
 544 extern struct mutex module_mutex;
 545
 546 /* FIXME: It'd be nice to isolate modules during init, too, so they
 547    aren't used before they (may) fail.  But presently too much code
 548    (IDE & SCSI) require entry into the module during init.*/
 549 static inline bool module_is_live(struct module *mod)
 550 {
 551         return mod->state != MODULE_STATE_GOING;
 552 }
 553
 554 struct module *__module_text_address(unsigned long addr);
 555 struct module *__module_address(unsigned long addr);
 556 bool is_module_address(unsigned long addr);
 557 bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr);
 558 bool is_module_percpu_address(unsigned long addr);
 559 bool is_module_text_address(unsigned long addr);
 560
 561 static inline bool within_module_core(unsigned long addr,
 562                                       const struct module *mod)
 563 {
 564         return (unsigned long)mod->core_layout.base <= addr &&
 565                addr < (unsigned long)mod->core_layout.base + mod->core_layout.size;
 566 }
 567
 568 static inline bool within_module_init(unsigned long addr,
 569                                       const struct module *mod)
 570 {
 571         return (unsigned long)mod->init_layout.base <= addr &&
 572                addr < (unsigned long)mod->init_layout.base + mod->init_layout.size;
 573 }
 574
 575 static inline bool within_module(unsigned long addr, const struct module *mod)
 576 {
 577         return within_module_init(addr, mod) || within_module_core(addr, mod);
 578 }
 579
 580 /* Search for module by name: must hold module_mutex. */
 581 struct module *find_module(const char *name);
 582
 583 struct symsearch {
 584         const struct kernel_symbol *start, *stop;
 585         const s32 *crcs;
 586         enum mod_license {
 587                 NOT_GPL_ONLY,
 588                 GPL_ONLY,
 589                 WILL_BE_GPL_ONLY,
 590         } license;
 591         bool unused;
 592 };
 593
 594 /* Returns 0 and fills in value, defined and namebuf, or -ERANGE if
 595    symnum out of range. */
 596 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
 597                         char *name, char *module_name, int *exported);
 598
 599 /* Look for this name: can be of form module:name. */
 600 unsigned long module_kallsyms_lookup_name(const char *name);
 601
 602 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 603                                              struct module *, unsigned long),
 604                                    void *data);
 605
 606 extern void __noreturn __module_put_and_exit(struct module *mod,
 607                         long code);
 608 #define module_put_and_exit(code) __module_put_and_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,
 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 #ifdef CONFIG_LIVEPATCH
 674 static inline bool is_livepatch_module(struct module *mod)
 675 {
 676         return mod->klp;
 677 }
 678 #else /* !CONFIG_LIVEPATCH */
 679 static inline bool is_livepatch_module(struct module *mod)
 680 {
 681         return false;
 682 }
 683 #endif /* CONFIG_LIVEPATCH */
 684
 685 bool is_module_sig_enforced(void);
 686 void set_module_sig_enforced(void);
 687
 688 #else /* !CONFIG_MODULES... */
 689
 690 static inline struct module *__module_address(unsigned long addr)
 691 {
 692         return NULL;
 693 }
 694
 695 static inline struct module *__module_text_address(unsigned long addr)
 696 {
 697         return NULL;
 698 }
 699
 700 static inline bool is_module_address(unsigned long addr)
 701 {
 702         return false;
 703 }
 704
 705 static inline bool is_module_percpu_address(unsigned long addr)
 706 {
 707         return false;
 708 }
 709
 710 static inline bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr)
 711 {
 712         return false;
 713 }
 714
 715 static inline bool is_module_text_address(unsigned long addr)
 716 {
 717         return false;
 718 }
 719
 720 static inline bool within_module_core(unsigned long addr,
 721                                       const struct module *mod)
 722 {
 723         return false;
 724 }
 725
 726 static inline bool within_module_init(unsigned long addr,
 727                                       const struct module *mod)
 728 {
 729         return false;
 730 }
 731
 732 static inline bool within_module(unsigned long addr, const struct module *mod)
 733 {
 734         return false;
 735 }
 736
 737 /* Get/put a kernel symbol (calls should be symmetric) */
 738 #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); })
 739 #define symbol_put(x) do { } while (0)
 740 #define symbol_put_addr(x) do { } while (0)
 741
 742 static inline void __module_get(struct module *module)
 743 {
 744 }
 745
 746 static inline bool try_module_get(struct module *module)
 747 {
 748         return true;
 749 }
 750
 751 static inline void module_put(struct module *module)
 752 {
 753 }
 754
 755 #define module_name(mod) "kernel"
 756
 757 /* For kallsyms to ask for address resolution.  NULL means not found. */
 758 static inline const char *module_address_lookup(unsigned long addr,
 759                                           unsigned long *symbolsize,
 760                                           unsigned long *offset,
 761                                           char **modname,
 762                                           char *namebuf)
 763 {
 764         return NULL;
 765 }
 766
 767 static inline int lookup_module_symbol_name(unsigned long addr, char *symname)
 768 {
 769         return -ERANGE;
 770 }
 771
 772 static inline int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
 773 {
 774         return -ERANGE;
 775 }
 776
 777 static inline int module_get_kallsym(unsigned int symnum, unsigned long *value,
 778                                         char *type, char *name,
 779                                         char *module_name, int *exported)
 780 {
 781         return -ERANGE;
 782 }
 783
 784 static inline unsigned long module_kallsyms_lookup_name(const char *name)
 785 {
 786         return 0;
 787 }
 788
 789 static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 790                                                            struct module *,
 791                                                            unsigned long),
 792                                                  void *data)
 793 {
 794         return 0;
 795 }
 796
 797 static inline int register_module_notifier(struct notifier_block *nb)
 798 {
 799         /* no events will happen anyway, so this can always succeed */
 800         return 0;
 801 }
 802
 803 static inline int unregister_module_notifier(struct notifier_block *nb)
 804 {
 805         return 0;
 806 }
 807
 808 #define module_put_and_exit(code) do_exit(code)
 809
 810 static inline void print_modules(void)
 811 {
 812 }
 813
 814 static inline bool module_requested_async_probing(struct module *module)
 815 {
 816         return false;
 817 }
 818
 819 static inline bool is_module_sig_enforced(void)
 820 {
 821         return false;
 822 }
 823
 824 static inline void set_module_sig_enforced(void)
 825 {
 826 }
 827
 828 /* Dereference module function descriptor */
 829 static inline
 830 void *dereference_module_function_descriptor(struct module *mod, void *ptr)
 831 {
 832         return ptr;
 833 }
 834
 835 #endif /* CONFIG_MODULES */
 836
 837 #ifdef CONFIG_SYSFS
 838 extern struct kset *module_kset;
 839 extern struct kobj_type module_ktype;
 840 extern int module_sysfs_initialized;
 841 #endif /* CONFIG_SYSFS */
 842
 843 #define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x)
 844
 845 /* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */
 846
 847 #define __MODULE_STRING(x) __stringify(x)
 848
 849 #ifdef CONFIG_GENERIC_BUG
 850 void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
 851                          struct module *);
 852 void module_bug_cleanup(struct module *);
 853
 854 #else   /* !CONFIG_GENERIC_BUG */
 855
 856 static inline void module_bug_finalize(const Elf_Ehdr *hdr,
 857                                         const Elf_Shdr *sechdrs,
 858                                         struct module *mod)
 859 {
 860 }
 861 static inline void module_bug_cleanup(struct module *mod) {}
 862 #endif  /* CONFIG_GENERIC_BUG */
 863
 864 #ifdef CONFIG_RETPOLINE
 865 extern bool retpoline_module_ok(bool has_retpoline);
 866 #else
 867 static inline bool retpoline_module_ok(bool has_retpoline)
 868 {
 869         return true;
 870 }
 871 #endif
 872
 873 #ifdef CONFIG_MODULE_SIG
 874 static inline bool module_sig_ok(struct module *module)
 875 {
 876         return module->sig_ok;
 877 }
 878 #else   /* !CONFIG_MODULE_SIG */
 879 static inline bool module_sig_ok(struct module *module)
 880 {
 881         return true;
 882 }
 883 #endif  /* CONFIG_MODULE_SIG */
 884
 885 #endif /* _LINUX_MODULE_H */