include/linux/kasan.h

   1 #ifndef _LINUX_KASAN_H
   2 #define _LINUX_KASAN_H
   3
   4 #include <linux/types.h>
   5
   6 struct kmem_cache;
   7 struct page;
   8 struct vm_struct;
   9
  10 #ifdef CONFIG_KASAN
  11
  12 #define KASAN_SHADOW_SCALE_SHIFT 3
  13
  14 #include <asm/kasan.h>
  15 #include <asm/pgtable.h>
  16
  17 extern unsigned char kasan_zero_page[PAGE_SIZE];
  18 extern pte_t kasan_zero_pte[PTRS_PER_PTE];
  19 extern pmd_t kasan_zero_pmd[PTRS_PER_PMD];
  20 extern pud_t kasan_zero_pud[PTRS_PER_PUD];
  21
  22 void kasan_populate_zero_shadow(const void *shadow_start,
  23                                 const void *shadow_end);
  24
  25 static inline void *kasan_mem_to_shadow(const void *addr)
  26 {
  27         return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
  28                 + KASAN_SHADOW_OFFSET;
  29 }
  30
  31 /* Enable reporting bugs after kasan_disable_current() */
  32 extern void kasan_enable_current(void);
  33
  34 /* Disable reporting bugs for current task */
  35 extern void kasan_disable_current(void);
  36
  37 void kasan_unpoison_shadow(const void *address, size_t size);
  38
  39 void kasan_unpoison_task_stack(struct task_struct *task);
  40 void kasan_unpoison_stack_above_sp_to(const void *watermark);
  41
  42 void kasan_alloc_pages(struct page *page, unsigned int order);
  43 void kasan_free_pages(struct page *page, unsigned int order);
  44
  45 void kasan_cache_create(struct kmem_cache *cache, size_t *size,
  46                         unsigned long *flags);
  47 void kasan_cache_shrink(struct kmem_cache *cache);
  48 void kasan_cache_shutdown(struct kmem_cache *cache);
  49
  50 void kasan_poison_slab(struct page *page);
  51 void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
  52 void kasan_poison_object_data(struct kmem_cache *cache, void *object);
  53 void kasan_init_slab_obj(struct kmem_cache *cache, const void *object);
  54
  55 void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags);
  56 void kasan_kfree_large(const void *ptr);
  57 void kasan_poison_kfree(void *ptr);
  58 void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size,
  59                   gfp_t flags);
  60 void kasan_krealloc(const void *object, size_t new_size, gfp_t flags);
  61
  62 void kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags);
  63 bool kasan_slab_free(struct kmem_cache *s, void *object);
  64
  65 struct kasan_cache {
  66         int alloc_meta_offset;
  67         int free_meta_offset;
  68 };
  69
  70 int kasan_module_alloc(void *addr, size_t size);
  71 void kasan_free_shadow(const struct vm_struct *vm);
  72
  73 size_t ksize(const void *);
  74 static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); }
  75 size_t kasan_metadata_size(struct kmem_cache *cache);
  76
  77 #else /* CONFIG_KASAN */
  78
  79 static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
  80
  81 static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
  82 static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {}
  83
  84 static inline void kasan_enable_current(void) {}
  85 static inline void kasan_disable_current(void) {}
  86
  87 static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
  88 static inline void kasan_free_pages(struct page *page, unsigned int order) {}
  89
  90 static inline void kasan_cache_create(struct kmem_cache *cache,
  91                                       size_t *size,
  92                                       unsigned long *flags) {}
  93 static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
  94 static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
  95
  96 static inline void kasan_poison_slab(struct page *page) {}
  97 static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
  98                                         void *object) {}
  99 static inline void kasan_poison_object_data(struct kmem_cache *cache,
 100                                         void *object) {}
 101 static inline void kasan_init_slab_obj(struct kmem_cache *cache,
 102                                 const void *object) {}
 103
 104 static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {}
 105 static inline void kasan_kfree_large(const void *ptr) {}
 106 static inline void kasan_poison_kfree(void *ptr) {}
 107 static inline void kasan_kmalloc(struct kmem_cache *s, const void *object,
 108                                 size_t size, gfp_t flags) {}
 109 static inline void kasan_krealloc(const void *object, size_t new_size,
 110                                  gfp_t flags) {}
 111
 112 static inline void kasan_slab_alloc(struct kmem_cache *s, void *object,
 113                                    gfp_t flags) {}
 114 static inline bool kasan_slab_free(struct kmem_cache *s, void *object)
 115 {
 116         return false;
 117 }
 118
 119 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
 120 static inline void kasan_free_shadow(const struct vm_struct *vm) {}
 121
 122 static inline void kasan_unpoison_slab(const void *ptr) { }
 123 static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
 124
 125 #endif /* CONFIG_KASAN */
 126
 127 #endif /* LINUX_KASAN_H */