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
 393 #ifdef CONFIG_UNUSED_SYMBOLS
 394         /* unused exported symbols. */
 395         const struct kernel_symbol *unused_syms;
 396         const s32 *unused_crcs;
 397         unsigned int num_unused_syms;
 398
 399         /* GPL-only, unused exported symbols. */
 400         unsigned int num_unused_gpl_syms;
 401         const struct kernel_symbol *unused_gpl_syms;
 402         const s32 *unused_gpl_crcs;
 403 #endif
 404
 405 #ifdef CONFIG_MODULE_SIG
 406         /* Signature was verified. */
 407         bool sig_ok;
 408 #endif
 409
 410         bool async_probe_requested;
 411
 412         /* symbols that will be GPL-only in the near future. */
 413         const struct kernel_symbol *gpl_future_syms;
 414         const s32 *gpl_future_crcs;
 415         unsigned int num_gpl_future_syms;
 416
 417         /* Exception table */
 418         unsigned int num_exentries;
 419         struct exception_table_entry *extable;
 420
 421         /* Startup function. */
 422         int (*init)(void);
 423
 424         /* Core layout: rbtree is accessed frequently, so keep together. */
 425         struct module_layout core_layout __module_layout_align;
 426         struct module_layout init_layout;
 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_JUMP_LABEL
 477         struct jump_entry *jump_entries;
 478         unsigned int num_jump_entries;
 479 #endif
 480 #ifdef CONFIG_TRACING
 481         unsigned int num_trace_bprintk_fmt;
 482         const char **trace_bprintk_fmt_start;
 483 #endif
 484 #ifdef CONFIG_EVENT_TRACING
 485         struct trace_event_call **trace_events;
 486         unsigned int num_trace_events;
 487         struct trace_eval_map **trace_evals;
 488         unsigned int num_trace_evals;
 489 #endif
 490 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 491         unsigned int num_ftrace_callsites;
 492         unsigned long *ftrace_callsites;
 493 #endif
 494 #ifdef CONFIG_KPROBES
 495         void *kprobes_text_start;
 496         unsigned int kprobes_text_size;
 497         unsigned long *kprobe_blacklist;
 498         unsigned int num_kprobe_blacklist;
 499 #endif
 500
 501 #ifdef CONFIG_LIVEPATCH
 502         bool klp; /* Is this a livepatch module? */
 503         bool klp_alive;
 504
 505         /* Elf information */
 506         struct klp_modinfo *klp_info;
 507 #endif
 508
 509 #ifdef CONFIG_MODULE_UNLOAD
 510         /* What modules depend on me? */
 511         struct list_head source_list;
 512         /* What modules do I depend on? */
 513         struct list_head target_list;
 514
 515         /* Destruction function. */
 516         void (*exit)(void);
 517
 518         atomic_t refcnt;
 519 #endif
 520
 521 #ifdef CONFIG_CONSTRUCTORS
 522         /* Constructor functions. */
 523         ctor_fn_t *ctors;
 524         unsigned int num_ctors;
 525 #endif
 526
 527 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
 528         struct error_injection_entry *ei_funcs;
 529         unsigned int num_ei_funcs;
 530 #endif
 531 } ____cacheline_aligned __randomize_layout;
 532 #ifndef MODULE_ARCH_INIT
 533 #define MODULE_ARCH_INIT {}
 534 #endif
 535
 536 #ifndef HAVE_ARCH_KALLSYMS_SYMBOL_VALUE
 537 static inline unsigned long kallsyms_symbol_value(const Elf_Sym *sym)
 538 {
 539         return sym->st_value;
 540 }
 541 #endif
 542
 543 extern struct mutex module_mutex;
 544
 545 /* FIXME: It'd be nice to isolate modules during init, too, so they
 546    aren't used before they (may) fail.  But presently too much code
 547    (IDE & SCSI) require entry into the module during init.*/
 548 static inline bool module_is_live(struct module *mod)
 549 {
 550         return mod->state != MODULE_STATE_GOING;
 551 }
 552
 553 struct module *__module_text_address(unsigned long addr);
 554 struct module *__module_address(unsigned long addr);
 555 bool is_module_address(unsigned long addr);
 556 bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr);
 557 bool is_module_percpu_address(unsigned long addr);
 558 bool is_module_text_address(unsigned long addr);
 559
 560 static inline bool within_module_core(unsigned long addr,
 561                                       const struct module *mod)
 562 {
 563         return (unsigned long)mod->core_layout.base <= addr &&
 564                addr < (unsigned long)mod->core_layout.base + mod->core_layout.size;
 565 }
 566
 567 static inline bool within_module_init(unsigned long addr,
 568                                       const struct module *mod)
 569 {
 570         return (unsigned long)mod->init_layout.base <= addr &&
 571                addr < (unsigned long)mod->init_layout.base + mod->init_layout.size;
 572 }
 573
 574 static inline bool within_module(unsigned long addr, const struct module *mod)
 575 {
 576         return within_module_init(addr, mod) || within_module_core(addr, mod);
 577 }
 578
 579 /* Search for module by name: must hold module_mutex. */
 580 struct module *find_module(const char *name);
 581
 582 struct symsearch {
 583         const struct kernel_symbol *start, *stop;
 584         const s32 *crcs;
 585         enum {
 586                 NOT_GPL_ONLY,
 587                 GPL_ONLY,
 588                 WILL_BE_GPL_ONLY,
 589         } licence;
 590         bool unused;
 591 };
 592
 593 /*
 594  * Search for an exported symbol by name.
 595  *
 596  * Must be called with module_mutex held or preemption disabled.
 597  */
 598 const struct kernel_symbol *find_symbol(const char *name,
 599                                         struct module **owner,
 600                                         const s32 **crc,
 601                                         bool gplok,
 602                                         bool warn);
 603
 604 /*
 605  * Walk the exported symbol table
 606  *
 607  * Must be called with module_mutex held or preemption disabled.
 608  */
 609 bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
 610                                     struct module *owner,
 611                                     void *data), void *data);
 612
 613 /* Returns 0 and fills in value, defined and namebuf, or -ERANGE if
 614    symnum out of range. */
 615 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
 616                         char *name, char *module_name, int *exported);
 617
 618 /* Look for this name: can be of form module:name. */
 619 unsigned long module_kallsyms_lookup_name(const char *name);
 620
 621 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 622                                              struct module *, unsigned long),
 623                                    void *data);
 624
 625 extern void __noreturn __module_put_and_exit(struct module *mod,
 626                         long code);
 627 #define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code)
 628
 629 #ifdef CONFIG_MODULE_UNLOAD
 630 int module_refcount(struct module *mod);
 631 void __symbol_put(const char *symbol);
 632 #define symbol_put(x) __symbol_put(__stringify(x))
 633 void symbol_put_addr(void *addr);
 634
 635 /* Sometimes we know we already have a refcount, and it's easier not
 636    to handle the error case (which only happens with rmmod --wait). */
 637 extern void __module_get(struct module *module);
 638
 639 /* This is the Right Way to get a module: if it fails, it's being removed,
 640  * so pretend it's not there. */
 641 extern bool try_module_get(struct module *module);
 642
 643 extern void module_put(struct module *module);
 644
 645 #else /*!CONFIG_MODULE_UNLOAD*/
 646 static inline bool try_module_get(struct module *module)
 647 {
 648         return !module || module_is_live(module);
 649 }
 650 static inline void module_put(struct module *module)
 651 {
 652 }
 653 static inline void __module_get(struct module *module)
 654 {
 655 }
 656 #define symbol_put(x) do { } while (0)
 657 #define symbol_put_addr(p) do { } while (0)
 658
 659 #endif /* CONFIG_MODULE_UNLOAD */
 660 int ref_module(struct module *a, struct module *b);
 661
 662 /* This is a #define so the string doesn't get put in every .o file */
 663 #define module_name(mod)                        \
 664 ({                                              \
 665         struct module *__mod = (mod);           \
 666         __mod ? __mod->name : "kernel";         \
 667 })
 668
 669 /* Dereference module function descriptor */
 670 void *dereference_module_function_descriptor(struct module *mod, void *ptr);
 671
 672 /* For kallsyms to ask for address resolution.  namebuf should be at
 673  * least KSYM_NAME_LEN long: a pointer to namebuf is returned if
 674  * found, otherwise NULL. */
 675 const char *module_address_lookup(unsigned long addr,
 676                             unsigned long *symbolsize,
 677                             unsigned long *offset,
 678                             char **modname,
 679                             char *namebuf);
 680 int lookup_module_symbol_name(unsigned long addr, char *symname);
 681 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
 682
 683 int register_module_notifier(struct notifier_block *nb);
 684 int unregister_module_notifier(struct notifier_block *nb);
 685
 686 extern void print_modules(void);
 687
 688 static inline bool module_requested_async_probing(struct module *module)
 689 {
 690         return module && module->async_probe_requested;
 691 }
 692
 693 #ifdef CONFIG_LIVEPATCH
 694 static inline bool is_livepatch_module(struct module *mod)
 695 {
 696         return mod->klp;
 697 }
 698 #else /* !CONFIG_LIVEPATCH */
 699 static inline bool is_livepatch_module(struct module *mod)
 700 {
 701         return false;
 702 }
 703 #endif /* CONFIG_LIVEPATCH */
 704
 705 bool is_module_sig_enforced(void);
 706 void set_module_sig_enforced(void);
 707
 708 #else /* !CONFIG_MODULES... */
 709
 710 static inline struct module *__module_address(unsigned long addr)
 711 {
 712         return NULL;
 713 }
 714
 715 static inline struct module *__module_text_address(unsigned long addr)
 716 {
 717         return NULL;
 718 }
 719
 720 static inline bool is_module_address(unsigned long addr)
 721 {
 722         return false;
 723 }
 724
 725 static inline bool is_module_percpu_address(unsigned long addr)
 726 {
 727         return false;
 728 }
 729
 730 static inline bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr)
 731 {
 732         return false;
 733 }
 734
 735 static inline bool is_module_text_address(unsigned long addr)
 736 {
 737         return false;
 738 }
 739
 740 static inline bool within_module_core(unsigned long addr,
 741                                       const struct module *mod)
 742 {
 743         return false;
 744 }
 745
 746 static inline bool within_module_init(unsigned long addr,
 747                                       const struct module *mod)
 748 {
 749         return false;
 750 }
 751
 752 static inline bool within_module(unsigned long addr, const struct module *mod)
 753 {
 754         return false;
 755 }
 756
 757 /* Get/put a kernel symbol (calls should be symmetric) */
 758 #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); })
 759 #define symbol_put(x) do { } while (0)
 760 #define symbol_put_addr(x) do { } while (0)
 761
 762 static inline void __module_get(struct module *module)
 763 {
 764 }
 765
 766 static inline bool try_module_get(struct module *module)
 767 {
 768         return true;
 769 }
 770
 771 static inline void module_put(struct module *module)
 772 {
 773 }
 774
 775 #define module_name(mod) "kernel"
 776
 777 /* For kallsyms to ask for address resolution.  NULL means not found. */
 778 static inline const char *module_address_lookup(unsigned long addr,
 779                                           unsigned long *symbolsize,
 780                                           unsigned long *offset,
 781                                           char **modname,
 782                                           char *namebuf)
 783 {
 784         return NULL;
 785 }
 786
 787 static inline int lookup_module_symbol_name(unsigned long addr, char *symname)
 788 {
 789         return -ERANGE;
 790 }
 791
 792 static inline int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
 793 {
 794         return -ERANGE;
 795 }
 796
 797 static inline int module_get_kallsym(unsigned int symnum, unsigned long *value,
 798                                         char *type, char *name,
 799                                         char *module_name, int *exported)
 800 {
 801         return -ERANGE;
 802 }
 803
 804 static inline unsigned long module_kallsyms_lookup_name(const char *name)
 805 {
 806         return 0;
 807 }
 808
 809 static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 810                                                            struct module *,
 811                                                            unsigned long),
 812                                                  void *data)
 813 {
 814         return 0;
 815 }
 816
 817 static inline int register_module_notifier(struct notifier_block *nb)
 818 {
 819         /* no events will happen anyway, so this can always succeed */
 820         return 0;
 821 }
 822
 823 static inline int unregister_module_notifier(struct notifier_block *nb)
 824 {
 825         return 0;
 826 }
 827
 828 #define module_put_and_exit(code) do_exit(code)
 829
 830 static inline void print_modules(void)
 831 {
 832 }
 833
 834 static inline bool module_requested_async_probing(struct module *module)
 835 {
 836         return false;
 837 }
 838
 839 static inline bool is_module_sig_enforced(void)
 840 {
 841         return false;
 842 }
 843
 844 static inline void set_module_sig_enforced(void)
 845 {
 846 }
 847
 848 /* Dereference module function descriptor */
 849 static inline
 850 void *dereference_module_function_descriptor(struct module *mod, void *ptr)
 851 {
 852         return ptr;
 853 }
 854
 855 #endif /* CONFIG_MODULES */
 856
 857 #ifdef CONFIG_SYSFS
 858 extern struct kset *module_kset;
 859 extern struct kobj_type module_ktype;
 860 extern int module_sysfs_initialized;
 861 #endif /* CONFIG_SYSFS */
 862
 863 #define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x)
 864
 865 /* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */
 866
 867 #define __MODULE_STRING(x) __stringify(x)
 868
 869 #ifdef CONFIG_GENERIC_BUG
 870 void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
 871                          struct module *);
 872 void module_bug_cleanup(struct module *);
 873
 874 #else   /* !CONFIG_GENERIC_BUG */
 875
 876 static inline void module_bug_finalize(const Elf_Ehdr *hdr,
 877                                         const Elf_Shdr *sechdrs,
 878                                         struct module *mod)
 879 {
 880 }
 881 static inline void module_bug_cleanup(struct module *mod) {}
 882 #endif  /* CONFIG_GENERIC_BUG */
 883
 884 #ifdef CONFIG_RETPOLINE
 885 extern bool retpoline_module_ok(bool has_retpoline);
 886 #else
 887 static inline bool retpoline_module_ok(bool has_retpoline)
 888 {
 889         return true;
 890 }
 891 #endif
 892
 893 #ifdef CONFIG_MODULE_SIG
 894 static inline bool module_sig_ok(struct module *module)
 895 {
 896         return module->sig_ok;
 897 }
 898 #else   /* !CONFIG_MODULE_SIG */
 899 static inline bool module_sig_ok(struct module *module)
 900 {
 901         return true;
 902 }
 903 #endif  /* CONFIG_MODULE_SIG */
 904
 905 #endif /* _LINUX_MODULE_H */