include/linux/kasan.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_KASAN_H
   3 #define _LINUX_KASAN_H
   4
   5 #include <linux/types.h>
   6
   7 struct kmem_cache;
   8 struct page;
   9 struct vm_struct;
  10 struct task_struct;
  11
  12 #ifdef CONFIG_KASAN
  13
  14 #define KASAN_SHADOW_SCALE_SHIFT 3
  15
  16 #include <asm/kasan.h>
  17 #include <asm/pgtable.h>
  18
  19 extern unsigned char kasan_zero_page[PAGE_SIZE];
  20 extern pte_t kasan_zero_pte[PTRS_PER_PTE];
  21 extern pmd_t kasan_zero_pmd[PTRS_PER_PMD];
  22 extern pud_t kasan_zero_pud[PTRS_PER_PUD];
  23 extern p4d_t kasan_zero_p4d[PTRS_PER_P4D];
  24
  25 void kasan_populate_zero_shadow(const void *shadow_start,
  26                                 const void *shadow_end);
  27
  28 static inline void *kasan_mem_to_shadow(const void *addr)
  29 {
  30         return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
  31                 + KASAN_SHADOW_OFFSET;
  32 }
  33
  34 /* Enable reporting bugs after kasan_disable_current() */
  35 extern void kasan_enable_current(void);
  36
  37 /* Disable reporting bugs for current task */
  38 extern void kasan_disable_current(void);
  39
  40 void kasan_unpoison_shadow(const void *address, size_t size);
  41
  42 void kasan_unpoison_task_stack(struct task_struct *task);
  43 void kasan_unpoison_stack_above_sp_to(const void *watermark);
  44
  45 void kasan_alloc_pages(struct page *page, unsigned int order);
  46 void kasan_free_pages(struct page *page, unsigned int order);
  47
  48 void kasan_cache_create(struct kmem_cache *cache, size_t *size,
  49                         slab_flags_t *flags);
  50 void kasan_cache_shrink(struct kmem_cache *cache);
  51 void kasan_cache_shutdown(struct kmem_cache *cache);
  52
  53 void kasan_poison_slab(struct page *page);
  54 void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
  55 void kasan_poison_object_data(struct kmem_cache *cache, void *object);
  56 void kasan_init_slab_obj(struct kmem_cache *cache, const void *object);
  57
  58 void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags);
  59 void kasan_kfree_large(const void *ptr);
  60 void kasan_poison_kfree(void *ptr);
  61 void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size,
  62                   gfp_t flags);
  63 void kasan_krealloc(const void *object, size_t new_size, gfp_t flags);
  64
  65 void kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags);
  66 bool kasan_slab_free(struct kmem_cache *s, void *object);
  67
  68 struct kasan_cache {
  69         int alloc_meta_offset;
  70         int free_meta_offset;
  71 };
  72
  73 int kasan_module_alloc(void *addr, size_t size);
  74 void kasan_free_shadow(const struct vm_struct *vm);
  75
  76 size_t ksize(const void *);
  77 static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); }
  78 size_t kasan_metadata_size(struct kmem_cache *cache);
  79
  80 bool kasan_save_enable_multi_shot(void);
  81 void kasan_restore_multi_shot(bool enabled);
  82
  83 #else /* CONFIG_KASAN */
  84
  85 static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
  86
  87 static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
  88 static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {}
  89
  90 static inline void kasan_enable_current(void) {}
  91 static inline void kasan_disable_current(void) {}
  92
  93 static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
  94 static inline void kasan_free_pages(struct page *page, unsigned int order) {}
  95
  96 static inline void kasan_cache_create(struct kmem_cache *cache,
  97                                       size_t *size,
  98                                       slab_flags_t *flags) {}
  99 static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
 100 static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
 101
 102 static inline void kasan_poison_slab(struct page *page) {}
 103 static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
 104                                         void *object) {}
 105 static inline void kasan_poison_object_data(struct kmem_cache *cache,
 106                                         void *object) {}
 107 static inline void kasan_init_slab_obj(struct kmem_cache *cache,
 108                                 const void *object) {}
 109
 110 static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {}
 111 static inline void kasan_kfree_large(const void *ptr) {}
 112 static inline void kasan_poison_kfree(void *ptr) {}
 113 static inline void kasan_kmalloc(struct kmem_cache *s, const void *object,
 114                                 size_t size, gfp_t flags) {}
 115 static inline void kasan_krealloc(const void *object, size_t new_size,
 116                                  gfp_t flags) {}
 117
 118 static inline void kasan_slab_alloc(struct kmem_cache *s, void *object,
 119                                    gfp_t flags) {}
 120 static inline bool kasan_slab_free(struct kmem_cache *s, void *object)
 121 {
 122         return false;
 123 }
 124
 125 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
 126 static inline void kasan_free_shadow(const struct vm_struct *vm) {}
 127
 128 static inline void kasan_unpoison_slab(const void *ptr) { }
 129 static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
 130
 131 #endif /* CONFIG_KASAN */
 132
 133 #endif /* LINUX_KASAN_H */