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 #define KASAN_SHADOW_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
  14
  15 #include <asm/kasan.h>
  16 #include <linux/sched.h>
  17
  18 static inline void *kasan_mem_to_shadow(const void *addr)
  19 {
  20         return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
  21                 + KASAN_SHADOW_OFFSET;
  22 }
  23
  24 /* Enable reporting bugs after kasan_disable_current() */
  25 static inline void kasan_enable_current(void)
  26 {
  27         current->kasan_depth++;
  28 }
  29
  30 /* Disable reporting bugs for current task */
  31 static inline void kasan_disable_current(void)
  32 {
  33         current->kasan_depth--;
  34 }
  35
  36 void kasan_unpoison_shadow(const void *address, size_t size);
  37
  38 void kasan_alloc_pages(struct page *page, unsigned int order);
  39 void kasan_free_pages(struct page *page, unsigned int order);
  40
  41 void kasan_poison_slab(struct page *page);
  42 void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
  43 void kasan_poison_object_data(struct kmem_cache *cache, void *object);
  44
  45 void kasan_kmalloc_large(const void *ptr, size_t size);
  46 void kasan_kfree_large(const void *ptr);
  47 void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size);
  48 void kasan_krealloc(const void *object, size_t new_size);
  49
  50 void kasan_slab_alloc(struct kmem_cache *s, void *object);
  51 void kasan_slab_free(struct kmem_cache *s, void *object);
  52
  53 #define MODULE_ALIGN (PAGE_SIZE << KASAN_SHADOW_SCALE_SHIFT)
  54
  55 int kasan_module_alloc(void *addr, size_t size);
  56 void kasan_free_shadow(const struct vm_struct *vm);
  57
  58 #else /* CONFIG_KASAN */
  59
  60 #define MODULE_ALIGN 1
  61
  62 static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
  63
  64 static inline void kasan_enable_current(void) {}
  65 static inline void kasan_disable_current(void) {}
  66
  67 static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
  68 static inline void kasan_free_pages(struct page *page, unsigned int order) {}
  69
  70 static inline void kasan_poison_slab(struct page *page) {}
  71 static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
  72                                         void *object) {}
  73 static inline void kasan_poison_object_data(struct kmem_cache *cache,
  74                                         void *object) {}
  75
  76 static inline void kasan_kmalloc_large(void *ptr, size_t size) {}
  77 static inline void kasan_kfree_large(const void *ptr) {}
  78 static inline void kasan_kmalloc(struct kmem_cache *s, const void *object,
  79                                 size_t size) {}
  80 static inline void kasan_krealloc(const void *object, size_t new_size) {}
  81
  82 static inline void kasan_slab_alloc(struct kmem_cache *s, void *object) {}
  83 static inline void kasan_slab_free(struct kmem_cache *s, void *object) {}
  84
  85 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
  86 static inline void kasan_free_shadow(const struct vm_struct *vm) {}
  87
  88 #endif /* CONFIG_KASAN */
  89
  90 #endif /* LINUX_KASAN_H */