mm/kasan/kasan.h

   1 #ifndef __MM_KASAN_KASAN_H
   2 #define __MM_KASAN_KASAN_H
   3
   4 #include <linux/kasan.h>
   5
   6 #define KASAN_SHADOW_SCALE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT)
   7 #define KASAN_SHADOW_MASK       (KASAN_SHADOW_SCALE_SIZE - 1)
   8
   9 #define KASAN_FREE_PAGE         0xFF  /* page was freed */
  10 #define KASAN_PAGE_REDZONE      0xFE  /* redzone for kmalloc_large allocations */
  11 #define KASAN_KMALLOC_REDZONE   0xFC  /* redzone inside slub object */
  12 #define KASAN_KMALLOC_FREE      0xFB  /* object was freed (kmem_cache_free/kfree) */
  13 #define KASAN_GLOBAL_REDZONE    0xFA  /* redzone for global variable */
  14
  15 /*
  16  * Stack redzone shadow values
  17  * (Those are compiler's ABI, don't change them)
  18  */
  19 #define KASAN_STACK_LEFT        0xF1
  20 #define KASAN_STACK_MID         0xF2
  21 #define KASAN_STACK_RIGHT       0xF3
  22 #define KASAN_STACK_PARTIAL     0xF4
  23
  24 /* Don't break randconfig/all*config builds */
  25 #ifndef KASAN_ABI_VERSION
  26 #define KASAN_ABI_VERSION 1
  27 #endif
  28
  29 struct kasan_access_info {
  30         const void *access_addr;
  31         const void *first_bad_addr;
  32         size_t access_size;
  33         bool is_write;
  34         unsigned long ip;
  35 };
  36
  37 /* The layout of struct dictated by compiler */
  38 struct kasan_source_location {
  39         const char *filename;
  40         int line_no;
  41         int column_no;
  42 };
  43
  44 /* The layout of struct dictated by compiler */
  45 struct kasan_global {
  46         const void *beg;                /* Address of the beginning of the global variable. */
  47         size_t size;                    /* Size of the global variable. */
  48         size_t size_with_redzone;       /* Size of the variable + size of the red zone. 32 bytes aligned */
  49         const void *name;
  50         const void *module_name;        /* Name of the module where the global variable is declared. */
  51         unsigned long has_dynamic_init; /* This needed for C++ */
  52 #if KASAN_ABI_VERSION >= 4
  53         struct kasan_source_location *location;
  54 #endif
  55 };
  56
  57 void kasan_report_error(struct kasan_access_info *info);
  58 void kasan_report_user_access(struct kasan_access_info *info);
  59
  60 static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
  61 {
  62         return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET)
  63                 << KASAN_SHADOW_SCALE_SHIFT);
  64 }
  65
  66 static inline bool kasan_enabled(void)
  67 {
  68         return !current->kasan_depth;
  69 }
  70
  71 void kasan_report(unsigned long addr, size_t size,
  72                 bool is_write, unsigned long ip);
  73
  74 #endif