include/linux/moduleloader.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_MODULELOADER_H
   3 #define _LINUX_MODULELOADER_H
   4 /* The stuff needed for archs to support modules. */
   5
   6 #include <linux/module.h>
   7 #include <linux/elf.h>
   8
   9 /* These may be implemented by architectures that need to hook into the
  10  * module loader code.  Architectures that don't need to do anything special
  11  * can just rely on the 'weak' default hooks defined in kernel/module.c.
  12  * Note, however, that at least one of apply_relocate or apply_relocate_add
  13  * must be implemented by each architecture.
  14  */
  15
  16 /* Adjust arch-specific sections.  Return 0 on success.  */
  17 int module_frob_arch_sections(Elf_Ehdr *hdr,
  18                               Elf_Shdr *sechdrs,
  19                               char *secstrings,
  20                               struct module *mod);
  21
  22 /* Additional bytes needed by arch in front of individual sections */
  23 unsigned int arch_mod_section_prepend(struct module *mod, unsigned int section);
  24
  25 /* Allocator used for allocating struct module, core sections and init
  26    sections.  Returns NULL on failure. */
  27 void *module_alloc(unsigned long size);
  28
  29 /* Free memory returned from module_alloc. */
  30 void module_memfree(void *module_region);
  31
  32 /* Determines if the section name is an init section (that is only used during
  33  * module loading).
  34  */
  35 bool module_init_section(const char *name);
  36
  37 /* Determines if the section name is an exit section (that is only used during
  38  * module unloading)
  39  */
  40 bool module_exit_section(const char *name);
  41
  42 /*
  43  * Apply the given relocation to the (simplified) ELF.  Return -error
  44  * or 0.
  45  */
  46 #ifdef CONFIG_MODULES_USE_ELF_REL
  47 int apply_relocate(Elf_Shdr *sechdrs,
  48                    const char *strtab,
  49                    unsigned int symindex,
  50                    unsigned int relsec,
  51                    struct module *mod);
  52 #else
  53 static inline int apply_relocate(Elf_Shdr *sechdrs,
  54                                  const char *strtab,
  55                                  unsigned int symindex,
  56                                  unsigned int relsec,
  57                                  struct module *me)
  58 {
  59         printk(KERN_ERR "module %s: REL relocation unsupported\n",
  60                module_name(me));
  61         return -ENOEXEC;
  62 }
  63 #endif
  64
  65 /*
  66  * Apply the given add relocation to the (simplified) ELF.  Return
  67  * -error or 0
  68  */
  69 #ifdef CONFIG_MODULES_USE_ELF_RELA
  70 int apply_relocate_add(Elf_Shdr *sechdrs,
  71                        const char *strtab,
  72                        unsigned int symindex,
  73                        unsigned int relsec,
  74                        struct module *mod);
  75 #else
  76 static inline int apply_relocate_add(Elf_Shdr *sechdrs,
  77                                      const char *strtab,
  78                                      unsigned int symindex,
  79                                      unsigned int relsec,
  80                                      struct module *me)
  81 {
  82         printk(KERN_ERR "module %s: REL relocation unsupported\n",
  83                module_name(me));
  84         return -ENOEXEC;
  85 }
  86 #endif
  87
  88 /* Any final processing of module before access.  Return -error or 0. */
  89 int module_finalize(const Elf_Ehdr *hdr,
  90                     const Elf_Shdr *sechdrs,
  91                     struct module *mod);
  92
  93 /* Any cleanup needed when module leaves. */
  94 void module_arch_cleanup(struct module *mod);
  95
  96 /* Any cleanup before freeing mod->module_init */
  97 void module_arch_freeing_init(struct module *mod);
  98
  99 #if (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) && \
 100                 !defined(CONFIG_KASAN_VMALLOC)
 101 #include <linux/kasan.h>
 102 #define MODULE_ALIGN (PAGE_SIZE << KASAN_SHADOW_SCALE_SHIFT)
 103 #else
 104 #define MODULE_ALIGN PAGE_SIZE
 105 #endif
 106
 107 #endif