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/* 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 */
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