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 #include <linux/sched.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_alloc_pages(struct page *page, unsigned int order);
  47 void kasan_free_pages(struct page *page, unsigned int order);
  48
  49 void kasan_poison_slab(struct page *page);
  50 void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
  51 void kasan_poison_object_data(struct kmem_cache *cache, void *object);
  52
  53 void kasan_kmalloc_large(const void *ptr, size_t size);
  54 void kasan_kfree_large(const void *ptr);
  55 void kasan_kfree(void *ptr);
  56 void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size);
  57 void kasan_krealloc(const void *object, size_t new_size);
  58
  59 void kasan_slab_alloc(struct kmem_cache *s, void *object);
  60 void kasan_slab_free(struct kmem_cache *s, void *object);
  61
  62 int kasan_module_alloc(void *addr, size_t size);
  63 void kasan_free_shadow(const struct vm_struct *vm);
  64
  65 #else /* CONFIG_KASAN */
  66
  67 static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
  68
  69 static inline void kasan_enable_current(void) {}
  70 static inline void kasan_disable_current(void) {}
  71
  72 static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
  73 static inline void kasan_free_pages(struct page *page, unsigned int order) {}
  74
  75 static inline void kasan_poison_slab(struct page *page) {}
  76 static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
  77                                         void *object) {}
  78 static inline void kasan_poison_object_data(struct kmem_cache *cache,
  79                                         void *object) {}
  80
  81 static inline void kasan_kmalloc_large(void *ptr, size_t size) {}
  82 static inline void kasan_kfree_large(const void *ptr) {}
  83 static inline void kasan_kfree(void *ptr) {}
  84 static inline void kasan_kmalloc(struct kmem_cache *s, const void *object,
  85                                 size_t size) {}
  86 static inline void kasan_krealloc(const void *object, size_t new_size) {}
  87
  88 static inline void kasan_slab_alloc(struct kmem_cache *s, void *object) {}
  89 static inline void kasan_slab_free(struct kmem_cache *s, void *object) {}
  90
  91 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
  92 static inline void kasan_free_shadow(const struct vm_struct *vm) {}
  93
  94 #endif /* CONFIG_KASAN */
  95
  96 #endif /* LINUX_KASAN_H */