LXR linux/mm/kasan/kasan.h

   1#ifndef __MM_KASAN_KASAN_H
   2#define __MM_KASAN_KASAN_H
   3
   4#include <linux/kasan.h>
   5#include <linux/stackdepot.h>
   6
   7#define KASAN_SHADOW_SCALE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT)
   8#define KASAN_SHADOW_MASK       (KASAN_SHADOW_SCALE_SIZE - 1)
   9
  10#define KASAN_FREE_PAGE         0xFF  /* page was freed */
  11#define KASAN_PAGE_REDZONE      0xFE  /* redzone for kmalloc_large allocations */
  12#define KASAN_KMALLOC_REDZONE   0xFC  /* redzone inside slub object */
  13#define KASAN_KMALLOC_FREE      0xFB  /* object was freed (kmem_cache_free/kfree) */
  14#define KASAN_GLOBAL_REDZONE    0xFA  /* redzone for global variable */
  15
  16/*
  17 * Stack redzone shadow values
  18 * (Those are compiler's ABI, don't change them)
  19 */
  20#define KASAN_STACK_LEFT        0xF1
  21#define KASAN_STACK_MID         0xF2
  22#define KASAN_STACK_RIGHT       0xF3
  23#define KASAN_STACK_PARTIAL     0xF4
  24
  25/* Don't break randconfig/all*config builds */
  26#ifndef KASAN_ABI_VERSION
  27#define KASAN_ABI_VERSION 1
  28#endif
  29
  30struct kasan_access_info {
  31        const void *access_addr;
  32        const void *first_bad_addr;
  33        size_t access_size;
  34        bool is_write;
  35        unsigned long ip;
  36};
  37
  38/* The layout of struct dictated by compiler */
  39struct kasan_source_location {
  40        const char *filename;
  41        int line_no;
  42        int column_no;
  43};
  44
  45/* The layout of struct dictated by compiler */
  46struct kasan_global {
  47        const void *beg;                /* Address of the beginning of the global variable. */
  48        size_t size;                    /* Size of the global variable. */
  49        size_t size_with_redzone;       /* Size of the variable + size of the red zone. 32 bytes aligned */
  50        const void *name;
  51        const void *module_name;        /* Name of the module where the global variable is declared. */
  52        unsigned long has_dynamic_init; /* This needed for C++ */
  53#if KASAN_ABI_VERSION >= 4
  54        struct kasan_source_location *location;
  55#endif
  56};
  57
  58/**
  59 * Structures to keep alloc and free tracks *
  60 */
  61
  62enum kasan_state {
  63        KASAN_STATE_INIT,
  64        KASAN_STATE_ALLOC,
  65        KASAN_STATE_FREE
  66};
  67
  68#define KASAN_STACK_DEPTH 64
  69
  70struct kasan_track {
  71        u32 pid;
  72        depot_stack_handle_t stack;
  73};
  74
  75struct kasan_alloc_meta {
  76        struct kasan_track track;
  77        u32 state : 2;  /* enum kasan_state */
  78        u32 alloc_size : 30;
  79        u32 reserved;
  80};
  81
  82struct kasan_free_meta {
  83        /* Allocator freelist pointer, unused by KASAN. */
  84        void **freelist;
  85        struct kasan_track track;
  86};
  87
  88struct kasan_alloc_meta *get_alloc_info(struct kmem_cache *cache,
  89                                        const void *object);
  90struct kasan_free_meta *get_free_info(struct kmem_cache *cache,
  91                                        const void *object);
  92
  93
  94static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
  95{
  96        return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET)
  97                << KASAN_SHADOW_SCALE_SHIFT);
  98}
  99
 100static inline bool kasan_report_enabled(void)
 101{
 102        return !current->kasan_depth;
 103}
 104
 105void kasan_report(unsigned long addr, size_t size,
 106                bool is_write, unsigned long ip);
 107
 108#endif
 109