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 #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 extern p4d_t kasan_zero_p4d[PTRS_PER_P4D];
  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 extern void kasan_enable_current(void);
  34
  35 /* Disable reporting bugs for current task */
  36 extern void kasan_disable_current(void);
  37
  38 void kasan_unpoison_shadow(const void *address, size_t size);
  39
  40 void kasan_unpoison_task_stack(struct task_struct *task);
  41 void kasan_unpoison_stack_above_sp_to(const void *watermark);
  42
  43 void kasan_alloc_pages(struct page *page, unsigned int order);
  44 void kasan_free_pages(struct page *page, unsigned int order);
  45
  46 void kasan_cache_create(struct kmem_cache *cache, size_t *size,
  47                         slab_flags_t *flags);
  48 void kasan_cache_shrink(struct kmem_cache *cache);
  49 void kasan_cache_shutdown(struct kmem_cache *cache);
  50
  51 void kasan_poison_slab(struct page *page);
  52 void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
  53 void kasan_poison_object_data(struct kmem_cache *cache, void *object);
  54 void kasan_init_slab_obj(struct kmem_cache *cache, const void *object);
  55
  56 void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags);
  57 void kasan_kfree_large(void *ptr, unsigned long ip);
  58 void kasan_poison_kfree(void *ptr, unsigned long ip);
  59 void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size,
  60                   gfp_t flags);
  61 void kasan_krealloc(const void *object, size_t new_size, gfp_t flags);
  62
  63 void kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags);
  64 bool kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip);
  65
  66 struct kasan_cache {
  67         int alloc_meta_offset;
  68         int free_meta_offset;
  69 };
  70
  71 int kasan_module_alloc(void *addr, size_t size);
  72 void kasan_free_shadow(const struct vm_struct *vm);
  73
  74 size_t ksize(const void *);
  75 static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); }
  76 size_t kasan_metadata_size(struct kmem_cache *cache);
  77
  78 bool kasan_save_enable_multi_shot(void);
  79 void kasan_restore_multi_shot(bool enabled);
  80
  81 #else /* CONFIG_KASAN */
  82
  83 static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
  84
  85 static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
  86 static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {}
  87
  88 static inline void kasan_enable_current(void) {}
  89 static inline void kasan_disable_current(void) {}
  90
  91 static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
  92 static inline void kasan_free_pages(struct page *page, unsigned int order) {}
  93
  94 static inline void kasan_cache_create(struct kmem_cache *cache,
  95                                       size_t *size,
  96                                       slab_flags_t *flags) {}
  97 static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
  98 static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
  99
 100 static inline void kasan_poison_slab(struct page *page) {}
 101 static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
 102                                         void *object) {}
 103 static inline void kasan_poison_object_data(struct kmem_cache *cache,
 104                                         void *object) {}
 105 static inline void kasan_init_slab_obj(struct kmem_cache *cache,
 106                                 const void *object) {}
 107
 108 static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {}
 109 static inline void kasan_kfree_large(void *ptr, unsigned long ip) {}
 110 static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {}
 111 static inline void kasan_kmalloc(struct kmem_cache *s, const void *object,
 112                                 size_t size, gfp_t flags) {}
 113 static inline void kasan_krealloc(const void *object, size_t new_size,
 114                                  gfp_t flags) {}
 115
 116 static inline void kasan_slab_alloc(struct kmem_cache *s, void *object,
 117                                    gfp_t flags) {}
 118 static inline bool kasan_slab_free(struct kmem_cache *s, void *object,
 119                                    unsigned long ip)
 120 {
 121         return false;
 122 }
 123
 124 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
 125 static inline void kasan_free_shadow(const struct vm_struct *vm) {}
 126
 127 static inline void kasan_unpoison_slab(const void *ptr) { }
 128 static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
 129
 130 #endif /* CONFIG_KASAN */
 131
 132 #endif /* LINUX_KASAN_H */