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
   9 #ifdef CONFIG_KASAN
  10
  11 #define KASAN_SHADOW_SCALE_SHIFT 3
  12 #define KASAN_SHADOW_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
  13
  14 #include <asm/kasan.h>
  15 #include <linux/sched.h>
  16
  17 static inline void *kasan_mem_to_shadow(const void *addr)
  18 {
  19         return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
  20                 + KASAN_SHADOW_OFFSET;
  21 }
  22
  23 /* Enable reporting bugs after kasan_disable_current() */
  24 static inline void kasan_enable_current(void)
  25 {
  26         current->kasan_depth++;
  27 }
  28
  29 /* Disable reporting bugs for current task */
  30 static inline void kasan_disable_current(void)
  31 {
  32         current->kasan_depth--;
  33 }
  34
  35 void kasan_unpoison_shadow(const void *address, size_t size);
  36
  37 void kasan_alloc_pages(struct page *page, unsigned int order);
  38 void kasan_free_pages(struct page *page, unsigned int order);
  39
  40 #else /* CONFIG_KASAN */
  41
  42 static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
  43
  44 static inline void kasan_enable_current(void) {}
  45 static inline void kasan_disable_current(void) {}
  46
  47 static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
  48 static inline void kasan_free_pages(struct page *page, unsigned int order) {}
  49
  50 #endif /* CONFIG_KASAN */
  51
  52 #endif /* LINUX_KASAN_H */