diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/kasan.h | 89 | ||||
| -rw-r--r-- | include/linux/kernel.h | 2 |
2 files changed, 91 insertions, 0 deletions
diff --git a/include/linux/kasan.h b/include/linux/kasan.h new file mode 100644 index 0000000000..7c184cd0e2 --- /dev/null +++ b/include/linux/kasan.h @@ -0,0 +1,89 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_KASAN_H +#define _LINUX_KASAN_H + +#include <linux/types.h> + +/* + * On 64bit architectures tlsf aligns all allocations to a 64bit + * boundary, otherwise they are only 32bit aligned. + */ +#ifdef CONFIG_64BIT +#define KASAN_SHADOW_SCALE_SHIFT 3 +#else +#define KASAN_SHADOW_SCALE_SHIFT 2 +#endif + +#define KASAN_TAG_KERNEL 0xFF /* native kernel pointers tag */ +#define KASAN_TAG_INVALID 0xFE /* inaccessible memory tag */ +#define KASAN_TAG_MAX 0xFD /* maximum value for random tags */ + +#define KASAN_FREE_PAGE 0xFF /* page was freed */ +#define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocations */ +#define KASAN_KMALLOC_REDZONE 0xFC /* redzone inside slub object */ +#define KASAN_KMALLOC_FREE 0xFB /* object was freed (kmem_cache_free/kfree) */ +#define KASAN_KMALLOC_FREETRACK 0xFA /* object was freed and has free track set */ + +#define KASAN_GLOBAL_REDZONE 0xF9 /* redzone for global variable */ +#define KASAN_VMALLOC_INVALID 0xF8 /* unallocated space in vmapped page */ + +/* + * Stack redzone shadow values + * (Those are compiler's ABI, don't change them) + */ +#define KASAN_STACK_LEFT 0xF1 +#define KASAN_STACK_MID 0xF2 +#define KASAN_STACK_RIGHT 0xF3 +#define KASAN_STACK_PARTIAL 0xF4 + +/* + * alloca redzone shadow values + */ +#define KASAN_ALLOCA_LEFT 0xCA +#define KASAN_ALLOCA_RIGHT 0xCB + +#ifdef CONFIG_KASAN + +extern unsigned long kasan_shadow_start; +extern unsigned long kasan_shadow_base; + +static inline void *kasan_mem_to_shadow(const void *addr) +{ + unsigned long a = (unsigned long)addr; + + a -= kasan_shadow_start; + a >>= KASAN_SHADOW_SCALE_SHIFT; + a += kasan_shadow_base; + + return (void *)a; +} + +void kasan_init(unsigned long membase, unsigned long memsize, + unsigned long shadow_base); + +/* Enable reporting bugs after kasan_disable_current() */ +extern void kasan_enable_current(void); + +/* Disable reporting bugs for current task */ +extern void kasan_disable_current(void); + +void kasan_poison_shadow(const void *address, size_t size, u8 value); +void kasan_unpoison_shadow(const void *address, size_t size); + +bool kasan_save_enable_multi_shot(void); +void kasan_restore_multi_shot(bool enabled); + +#else /* CONFIG_KASAN */ + +static inline void kasan_poison_shadow(const void *address, size_t size, u8 value) {} +static inline void kasan_unpoison_shadow(const void *address, size_t size) {} + +static inline void kasan_enable_current(void) {} +static inline void kasan_disable_current(void) {} + +static inline void kasan_init(unsigned long membase, unsigned long memsize, + unsigned long shadow_base) {} + +#endif /* CONFIG_KASAN */ + +#endif /* LINUX_KASAN_H */ diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 23c23a73f5..787571a5a0 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -229,6 +229,8 @@ extern long long simple_strtoll(const char *,char **,unsigned int); } \ ) +#define _RET_IP_ (unsigned long)__builtin_return_address(0) + extern const char hex_asc[]; #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] |