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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001/* SPDX-License-Identifier: GPL-2.0 */
Andrey Ryabinin0b24bec2015-02-13 14:39:17 -08002#ifndef __MM_KASAN_KASAN_H
3#define __MM_KASAN_KASAN_H
4
5#include <linux/kasan.h>
Alexander Potapenkocd110162016-03-25 14:22:08 -07006#include <linux/stackdepot.h>
Andrey Ryabinin0b24bec2015-02-13 14:39:17 -08007
8#define KASAN_SHADOW_SCALE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT)
9#define KASAN_SHADOW_MASK (KASAN_SHADOW_SCALE_SIZE - 1)
10
Andrey Ryabininb8c73fc2015-02-13 14:39:28 -080011#define KASAN_FREE_PAGE 0xFF /* page was freed */
Andrey Ryabinin0316bec2015-02-13 14:39:42 -080012#define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocations */
13#define KASAN_KMALLOC_REDZONE 0xFC /* redzone inside slub object */
14#define KASAN_KMALLOC_FREE 0xFB /* object was freed (kmem_cache_free/kfree) */
Andrey Ryabininbebf56a2015-02-13 14:40:17 -080015#define KASAN_GLOBAL_REDZONE 0xFA /* redzone for global variable */
Andrey Ryabinin0316bec2015-02-13 14:39:42 -080016
Andrey Ryabininc420f162015-02-13 14:39:59 -080017/*
18 * Stack redzone shadow values
19 * (Those are compiler's ABI, don't change them)
20 */
21#define KASAN_STACK_LEFT 0xF1
22#define KASAN_STACK_MID 0xF2
23#define KASAN_STACK_RIGHT 0xF3
24#define KASAN_STACK_PARTIAL 0xF4
Dmitry Vyukov828347f2016-11-30 15:54:16 -080025#define KASAN_USE_AFTER_SCOPE 0xF8
Andrey Ryabininc420f162015-02-13 14:39:59 -080026
Andrey Ryabininbebf56a2015-02-13 14:40:17 -080027/* Don't break randconfig/all*config builds */
28#ifndef KASAN_ABI_VERSION
29#define KASAN_ABI_VERSION 1
30#endif
Andrey Ryabininb8c73fc2015-02-13 14:39:28 -080031
Andrey Ryabinin0b24bec2015-02-13 14:39:17 -080032struct kasan_access_info {
33 const void *access_addr;
34 const void *first_bad_addr;
35 size_t access_size;
36 bool is_write;
37 unsigned long ip;
38};
39
Andrey Ryabininbebf56a2015-02-13 14:40:17 -080040/* The layout of struct dictated by compiler */
41struct kasan_source_location {
42 const char *filename;
43 int line_no;
44 int column_no;
45};
46
47/* The layout of struct dictated by compiler */
48struct kasan_global {
49 const void *beg; /* Address of the beginning of the global variable. */
50 size_t size; /* Size of the global variable. */
51 size_t size_with_redzone; /* Size of the variable + size of the red zone. 32 bytes aligned */
52 const void *name;
53 const void *module_name; /* Name of the module where the global variable is declared. */
54 unsigned long has_dynamic_init; /* This needed for C++ */
55#if KASAN_ABI_VERSION >= 4
56 struct kasan_source_location *location;
57#endif
Dmitry Vyukov045d5992016-11-30 15:54:13 -080058#if KASAN_ABI_VERSION >= 5
59 char *odr_indicator;
60#endif
Andrey Ryabininbebf56a2015-02-13 14:40:17 -080061};
62
Alexander Potapenko7ed2f9e2016-03-25 14:21:59 -070063/**
64 * Structures to keep alloc and free tracks *
65 */
66
Alexander Potapenkocd110162016-03-25 14:22:08 -070067#define KASAN_STACK_DEPTH 64
68
Alexander Potapenko7ed2f9e2016-03-25 14:21:59 -070069struct kasan_track {
Alexander Potapenkocd110162016-03-25 14:22:08 -070070 u32 pid;
71 depot_stack_handle_t stack;
Alexander Potapenko7ed2f9e2016-03-25 14:21:59 -070072};
73
74struct kasan_alloc_meta {
Andrey Ryabininb3cbd9b2016-08-02 14:02:52 -070075 struct kasan_track alloc_track;
76 struct kasan_track free_track;
Alexander Potapenko7ed2f9e2016-03-25 14:21:59 -070077};
78
Alexander Potapenko55834c52016-05-20 16:59:11 -070079struct qlist_node {
80 struct qlist_node *next;
81};
Alexander Potapenko7ed2f9e2016-03-25 14:21:59 -070082struct kasan_free_meta {
Alexander Potapenko55834c52016-05-20 16:59:11 -070083 /* This field is used while the object is in the quarantine.
84 * Otherwise it might be used for the allocator freelist.
85 */
86 struct qlist_node quarantine_link;
Alexander Potapenko7ed2f9e2016-03-25 14:21:59 -070087};
88
89struct kasan_alloc_meta *get_alloc_info(struct kmem_cache *cache,
90 const void *object);
91struct kasan_free_meta *get_free_info(struct kmem_cache *cache,
92 const void *object);
93
Andrey Ryabinin0b24bec2015-02-13 14:39:17 -080094static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
95{
96 return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET)
97 << KASAN_SHADOW_SCALE_SHIFT);
98}
99
Andrey Ryabinin0b24bec2015-02-13 14:39:17 -0800100void kasan_report(unsigned long addr, size_t size,
101 bool is_write, unsigned long ip);
Andrey Ryabinin7e088972016-08-02 14:02:55 -0700102void kasan_report_double_free(struct kmem_cache *cache, void *object,
Andrey Konovalov5ab6d912017-05-03 14:56:47 -0700103 void *ip);
Andrey Ryabinin0b24bec2015-02-13 14:39:17 -0800104
Alexander Potapenko80a92012016-07-28 15:49:07 -0700105#if defined(CONFIG_SLAB) || defined(CONFIG_SLUB)
Alexander Potapenko55834c52016-05-20 16:59:11 -0700106void quarantine_put(struct kasan_free_meta *info, struct kmem_cache *cache);
107void quarantine_reduce(void);
108void quarantine_remove_cache(struct kmem_cache *cache);
109#else
110static inline void quarantine_put(struct kasan_free_meta *info,
111 struct kmem_cache *cache) { }
112static inline void quarantine_reduce(void) { }
113static inline void quarantine_remove_cache(struct kmem_cache *cache) { }
114#endif
115
Andrey Ryabinin0b24bec2015-02-13 14:39:17 -0800116#endif