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