include/linux/kasan.h

   1 #ifndef _LINUX_KASAN_H
   2 #define _LINUX_KASAN_H
   3
   4 #include <linux/sched.h>
   5 #include <linux/types.h>
   6
   7 struct kmem_cache;
   8 struct page;
   9 struct vm_struct;
  10
  11 #ifdef CONFIG_KASAN
  12
  13 #define KASAN_SHADOW_SCALE_SHIFT 3
  14
  15 #include <asm/kasan.h>
  16 #include <asm/pgtable.h>
  17
  18 extern unsigned char kasan_zero_page[PAGE_SIZE];
  19 extern pte_t kasan_zero_pte[PTRS_PER_PTE];
  20 extern pmd_t kasan_zero_pmd[PTRS_PER_PMD];
  21 extern pud_t kasan_zero_pud[PTRS_PER_PUD];
  22
  23 void kasan_populate_zero_shadow(const void *shadow_start,
  24                                 const void *shadow_end);
  25
  26 static inline void *kasan_mem_to_shadow(const void *addr)
  27 {
  28         return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
  29                 + KASAN_SHADOW_OFFSET;
  30 }
  31
  32 /* Enable reporting bugs after kasan_disable_current() */
  33 static inline void kasan_enable_current(void)
  34 {
  35         current->kasan_depth++;
  36 }
  37
  38 /* Disable reporting bugs for current task */
  39 static inline void kasan_disable_current(void)
  40 {
  41         current->kasan_depth--;
  42 }
  43
  44 void kasan_unpoison_shadow(const void *address, size_t size);
  45
  46 void kasan_unpoison_task_stack(struct task_struct *task);
  47 void kasan_unpoison_stack_above_sp_to(const void *watermark);
  48
  49 void kasan_alloc_pages(struct page *page, unsigned int order);
  50 void kasan_free_pages(struct page *page, unsigned int order);
  51
  52 void kasan_cache_create(struct kmem_cache *cache, size_t *size,
  53                         unsigned long *flags);
  54 void kasan_cache_shrink(struct kmem_cache *cache);
  55 void kasan_cache_destroy(struct kmem_cache *cache);
  56
  57 void kasan_poison_slab(struct page *page);
  58 void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
  59 void kasan_poison_object_data(struct kmem_cache *cache, void *object);
  60 void kasan_init_slab_obj(struct kmem_cache *cache, const void *object);
  61
  62 void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags);
  63 void kasan_kfree_large(const void *ptr);
  64 void kasan_poison_kfree(void *ptr);
  65 void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size,
  66                   gfp_t flags);
  67 void kasan_krealloc(const void *object, size_t new_size, gfp_t flags);
  68
  69 void kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags);
  70 bool kasan_slab_free(struct kmem_cache *s, void *object);
  71
  72 struct kasan_cache {
  73         int alloc_meta_offset;
  74         int free_meta_offset;
  75 };
  76
  77 int kasan_module_alloc(void *addr, size_t size);
  78 void kasan_free_shadow(const struct vm_struct *vm);
  79
  80 size_t ksize(const void *);
  81 static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); }
  82 size_t kasan_metadata_size(struct kmem_cache *cache);
  83
  84 #else /* CONFIG_KASAN */
  85
  86 static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
  87
  88 static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
  89 static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {}
  90
  91 static inline void kasan_enable_current(void) {}
  92 static inline void kasan_disable_current(void) {}
  93
  94 static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
  95 static inline void kasan_free_pages(struct page *page, unsigned int order) {}
  96
  97 static inline void kasan_cache_create(struct kmem_cache *cache,
  98                                       size_t *size,
  99                                       unsigned long *flags) {}
 100 static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
 101 static inline void kasan_cache_destroy(struct kmem_cache *cache) {}
 102
 103 static inline void kasan_poison_slab(struct page *page) {}
 104 static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
 105                                         void *object) {}
 106 static inline void kasan_poison_object_data(struct kmem_cache *cache,
 107                                         void *object) {}
 108 static inline void kasan_init_slab_obj(struct kmem_cache *cache,
 109                                 const void *object) {}
 110
 111 static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {}
 112 static inline void kasan_kfree_large(const void *ptr) {}
 113 static inline void kasan_poison_kfree(void *ptr) {}
 114 static inline void kasan_kmalloc(struct kmem_cache *s, const void *object,
 115                                 size_t size, gfp_t flags) {}
 116 static inline void kasan_krealloc(const void *object, size_t new_size,
 117                                  gfp_t flags) {}
 118
 119 static inline void kasan_slab_alloc(struct kmem_cache *s, void *object,
 120                                    gfp_t flags) {}
 121 static inline bool kasan_slab_free(struct kmem_cache *s, void *object)
 122 {
 123         return false;
 124 }
 125
 126 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
 127 static inline void kasan_free_shadow(const struct vm_struct *vm) {}
 128
 129 static inline void kasan_unpoison_slab(const void *ptr) { }
 130 static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
 131
 132 #endif /* CONFIG_KASAN */
 133
 134 #endif /* LINUX_KASAN_H */