1#ifndef __MM_KASAN_KASAN_H
2#define __MM_KASAN_KASAN_H
3
4#include <linux/kasan.h>
5
6#define KASAN_SHADOW_SCALE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT)
7#define KASAN_SHADOW_MASK       (KASAN_SHADOW_SCALE_SIZE - 1)
8
9#define KASAN_FREE_PAGE         0xFF  /* page was freed */
10#define KASAN_FREE_PAGE         0xFF  /* page was freed */
11#define KASAN_PAGE_REDZONE      0xFE  /* redzone for kmalloc_large allocations */
12#define KASAN_KMALLOC_REDZONE   0xFC  /* redzone inside slub object */
13#define KASAN_KMALLOC_FREE      0xFB  /* object was freed (kmem_cache_free/kfree) */
14#define KASAN_GLOBAL_REDZONE    0xFA  /* redzone for global variable */
15
16/*
17 * Stack redzone shadow values
18 * (Those are compiler's ABI, don't change them)
19 */
20#define KASAN_STACK_LEFT        0xF1
21#define KASAN_STACK_MID         0xF2
22#define KASAN_STACK_RIGHT       0xF3
23#define KASAN_STACK_PARTIAL     0xF4
24
25/* Don't break randconfig/all*config builds */
26#ifndef KASAN_ABI_VERSION
27#define KASAN_ABI_VERSION 1
28#endif
29
30struct kasan_access_info {
31	const void *access_addr;
32	const void *first_bad_addr;
33	size_t access_size;
34	bool is_write;
35	unsigned long ip;
36};
37
38/* The layout of struct dictated by compiler */
39struct kasan_source_location {
40	const char *filename;
41	int line_no;
42	int column_no;
43};
44
45/* The layout of struct dictated by compiler */
46struct kasan_global {
47	const void *beg;		/* Address of the beginning of the global variable. */
48	size_t size;			/* Size of the global variable. */
49	size_t size_with_redzone;	/* Size of the variable + size of the red zone. 32 bytes aligned */
50	const void *name;
51	const void *module_name;	/* Name of the module where the global variable is declared. */
52	unsigned long has_dynamic_init;	/* This needed for C++ */
53#if KASAN_ABI_VERSION >= 4
54	struct kasan_source_location *location;
55#endif
56};
57
58void kasan_report_error(struct kasan_access_info *info);
59void kasan_report_user_access(struct kasan_access_info *info);
60
61static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
62{
63	return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET)
64		<< KASAN_SHADOW_SCALE_SHIFT);
65}
66
67static inline bool kasan_enabled(void)
68{
69	return !current->kasan_depth;
70}
71
72void kasan_report(unsigned long addr, size_t size,
73		bool is_write, unsigned long ip);
74
75#endif
76