mm/kasan/kasan.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __MM_KASAN_KASAN_H
   3 #define __MM_KASAN_KASAN_H
   4
   5 #include <linux/kasan.h>
   6 #include <linux/stackdepot.h>
   7
   8 #define KASAN_SHADOW_SCALE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT)
   9 #define KASAN_SHADOW_MASK       (KASAN_SHADOW_SCALE_SIZE - 1)
  10
  11 #define KASAN_FREE_PAGE         0xFF  /* page was freed */
  12 #define KASAN_PAGE_REDZONE      0xFE  /* redzone for kmalloc_large allocations */
  13 #define KASAN_KMALLOC_REDZONE   0xFC  /* redzone inside slub object */
  14 #define KASAN_KMALLOC_FREE      0xFB  /* object was freed (kmem_cache_free/kfree) */
  15 #define KASAN_GLOBAL_REDZONE    0xFA  /* redzone for global variable */
  16
  17 /*
  18  * Stack redzone shadow values
  19  * (Those are compiler's ABI, don't change them)
  20  */
  21 #define KASAN_STACK_LEFT        0xF1
  22 #define KASAN_STACK_MID         0xF2
  23 #define KASAN_STACK_RIGHT       0xF3
  24 #define KASAN_STACK_PARTIAL     0xF4
  25 #define KASAN_USE_AFTER_SCOPE   0xF8
  26
  27 /* Don't break randconfig/all*config builds */
  28 #ifndef KASAN_ABI_VERSION
  29 #define KASAN_ABI_VERSION 1
  30 #endif
  31
  32 struct kasan_access_info {
  33         const void *access_addr;
  34         const void *first_bad_addr;
  35         size_t access_size;
  36         bool is_write;
  37         unsigned long ip;
  38 };
  39
  40 /* The layout of struct dictated by compiler */
  41 struct kasan_source_location {
  42         const char *filename;
  43         int line_no;
  44         int column_no;
  45 };
  46
  47 /* The layout of struct dictated by compiler */
  48 struct kasan_global {
  49         const void *beg;                /* Address of the beginning of the global variable. */
  50         size_t size;                    /* Size of the global variable. */
  51         size_t size_with_redzone;       /* Size of the variable + size of the red zone. 32 bytes aligned */
  52         const void *name;
  53         const void *module_name;        /* Name of the module where the global variable is declared. */
  54         unsigned long has_dynamic_init; /* This needed for C++ */
  55 #if KASAN_ABI_VERSION >= 4
  56         struct kasan_source_location *location;
  57 #endif
  58 #if KASAN_ABI_VERSION >= 5
  59         char *odr_indicator;
  60 #endif
  61 };
  62
  63 /**
  64  * Structures to keep alloc and free tracks *
  65  */
  66
  67 #define KASAN_STACK_DEPTH 64
  68
  69 struct kasan_track {
  70         u32 pid;
  71         depot_stack_handle_t stack;
  72 };
  73
  74 struct kasan_alloc_meta {
  75         struct kasan_track alloc_track;
  76         struct kasan_track free_track;
  77 };
  78
  79 struct qlist_node {
  80         struct qlist_node *next;
  81 };
  82 struct kasan_free_meta {
  83         /* This field is used while the object is in the quarantine.
  84          * Otherwise it might be used for the allocator freelist.
  85          */
  86         struct qlist_node quarantine_link;
  87 };
  88
  89 struct kasan_alloc_meta *get_alloc_info(struct kmem_cache *cache,
  90                                         const void *object);
  91 struct kasan_free_meta *get_free_info(struct kmem_cache *cache,
  92                                         const void *object);
  93
  94 static 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
 100 void kasan_report(unsigned long addr, size_t size,
 101                 bool is_write, unsigned long ip);
 102 void kasan_report_double_free(struct kmem_cache *cache, void *object,
 103                                         void *ip);
 104
 105 #if defined(CONFIG_SLAB) || defined(CONFIG_SLUB)
 106 void quarantine_put(struct kasan_free_meta *info, struct kmem_cache *cache);
 107 void quarantine_reduce(void);
 108 void quarantine_remove_cache(struct kmem_cache *cache);
 109 #else
 110 static inline void quarantine_put(struct kasan_free_meta *info,
 111                                 struct kmem_cache *cache) { }
 112 static inline void quarantine_reduce(void) { }
 113 static inline void quarantine_remove_cache(struct kmem_cache *cache) { }
 114 #endif
 115
 116 #endif