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1#ifndef __MM_KASAN_KASAN_H
2#define __MM_KASAN_KASAN_H
3
4#include <linux/kasan.h>
5#include <linux/stackdepot.h>
6
7#define KASAN_SHADOW_SCALE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT)
8#define KASAN_SHADOW_MASK (KASAN_SHADOW_SCALE_SIZE - 1)
9
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
58/**
59 * Structures to keep alloc and free tracks *
60 */
61
62enum kasan_state {
63 KASAN_STATE_INIT,
64 KASAN_STATE_ALLOC,
65 KASAN_STATE_FREE
66};
67
68#define KASAN_STACK_DEPTH 64
69
70struct kasan_track {
71 u32 pid;
72 depot_stack_handle_t stack;
73};
74
75struct kasan_alloc_meta {
76 struct kasan_track track;
77 u32 state : 2; /* enum kasan_state */
78 u32 alloc_size : 30;
79 u32 reserved;
80};
81
82struct kasan_free_meta {
83 /* Allocator freelist pointer, unused by KASAN. */
84 void **freelist;
85 struct kasan_track track;
86};
87
88struct kasan_alloc_meta *get_alloc_info(struct kmem_cache *cache,
89 const void *object);
90struct kasan_free_meta *get_free_info(struct kmem_cache *cache,
91 const void *object);
92
93
94static 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
100static inline bool kasan_report_enabled(void)
101{
102 return !current->kasan_depth;
103}
104
105void kasan_report(unsigned long addr, size_t size,
106 bool is_write, unsigned long ip);
107
108#endif
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __MM_KASAN_KASAN_H
3#define __MM_KASAN_KASAN_H
4
5#include <linux/kasan.h>
6#include <linux/stackdepot.h>
7
8#define KASAN_SHADOW_SCALE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT)
9#define KASAN_SHADOW_MASK (KASAN_SHADOW_SCALE_SIZE - 1)
10
11#define KASAN_TAG_KERNEL 0xFF /* native kernel pointers tag */
12#define KASAN_TAG_INVALID 0xFE /* inaccessible memory tag */
13#define KASAN_TAG_MAX 0xFD /* maximum value for random tags */
14
15#ifdef CONFIG_KASAN_GENERIC
16#define KASAN_FREE_PAGE 0xFF /* page was freed */
17#define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocations */
18#define KASAN_KMALLOC_REDZONE 0xFC /* redzone inside slub object */
19#define KASAN_KMALLOC_FREE 0xFB /* object was freed (kmem_cache_free/kfree) */
20#define KASAN_KMALLOC_FREETRACK 0xFA /* object was freed and has free track set */
21#else
22#define KASAN_FREE_PAGE KASAN_TAG_INVALID
23#define KASAN_PAGE_REDZONE KASAN_TAG_INVALID
24#define KASAN_KMALLOC_REDZONE KASAN_TAG_INVALID
25#define KASAN_KMALLOC_FREE KASAN_TAG_INVALID
26#define KASAN_KMALLOC_FREETRACK KASAN_TAG_INVALID
27#endif
28
29#define KASAN_GLOBAL_REDZONE 0xF9 /* redzone for global variable */
30#define KASAN_VMALLOC_INVALID 0xF8 /* unallocated space in vmapped page */
31
32/*
33 * Stack redzone shadow values
34 * (Those are compiler's ABI, don't change them)
35 */
36#define KASAN_STACK_LEFT 0xF1
37#define KASAN_STACK_MID 0xF2
38#define KASAN_STACK_RIGHT 0xF3
39#define KASAN_STACK_PARTIAL 0xF4
40
41/*
42 * alloca redzone shadow values
43 */
44#define KASAN_ALLOCA_LEFT 0xCA
45#define KASAN_ALLOCA_RIGHT 0xCB
46
47#define KASAN_ALLOCA_REDZONE_SIZE 32
48
49/*
50 * Stack frame marker (compiler ABI).
51 */
52#define KASAN_CURRENT_STACK_FRAME_MAGIC 0x41B58AB3
53
54/* Don't break randconfig/all*config builds */
55#ifndef KASAN_ABI_VERSION
56#define KASAN_ABI_VERSION 1
57#endif
58
59struct kasan_access_info {
60 const void *access_addr;
61 const void *first_bad_addr;
62 size_t access_size;
63 bool is_write;
64 unsigned long ip;
65};
66
67/* The layout of struct dictated by compiler */
68struct kasan_source_location {
69 const char *filename;
70 int line_no;
71 int column_no;
72};
73
74/* The layout of struct dictated by compiler */
75struct kasan_global {
76 const void *beg; /* Address of the beginning of the global variable. */
77 size_t size; /* Size of the global variable. */
78 size_t size_with_redzone; /* Size of the variable + size of the red zone. 32 bytes aligned */
79 const void *name;
80 const void *module_name; /* Name of the module where the global variable is declared. */
81 unsigned long has_dynamic_init; /* This needed for C++ */
82#if KASAN_ABI_VERSION >= 4
83 struct kasan_source_location *location;
84#endif
85#if KASAN_ABI_VERSION >= 5
86 char *odr_indicator;
87#endif
88};
89
90/**
91 * Structures to keep alloc and free tracks *
92 */
93
94#define KASAN_STACK_DEPTH 64
95
96struct kasan_track {
97 u32 pid;
98 depot_stack_handle_t stack;
99};
100
101#ifdef CONFIG_KASAN_SW_TAGS_IDENTIFY
102#define KASAN_NR_FREE_STACKS 5
103#else
104#define KASAN_NR_FREE_STACKS 1
105#endif
106
107struct kasan_alloc_meta {
108 struct kasan_track alloc_track;
109#ifdef CONFIG_KASAN_GENERIC
110 /*
111 * call_rcu() call stack is stored into struct kasan_alloc_meta.
112 * The free stack is stored into struct kasan_free_meta.
113 */
114 depot_stack_handle_t aux_stack[2];
115#else
116 struct kasan_track free_track[KASAN_NR_FREE_STACKS];
117#endif
118#ifdef CONFIG_KASAN_SW_TAGS_IDENTIFY
119 u8 free_pointer_tag[KASAN_NR_FREE_STACKS];
120 u8 free_track_idx;
121#endif
122};
123
124struct qlist_node {
125 struct qlist_node *next;
126};
127struct kasan_free_meta {
128 /* This field is used while the object is in the quarantine.
129 * Otherwise it might be used for the allocator freelist.
130 */
131 struct qlist_node quarantine_link;
132#ifdef CONFIG_KASAN_GENERIC
133 struct kasan_track free_track;
134#endif
135};
136
137struct kasan_alloc_meta *get_alloc_info(struct kmem_cache *cache,
138 const void *object);
139struct kasan_free_meta *get_free_info(struct kmem_cache *cache,
140 const void *object);
141
142static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
143{
144 return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET)
145 << KASAN_SHADOW_SCALE_SHIFT);
146}
147
148static inline bool addr_has_shadow(const void *addr)
149{
150 return (addr >= kasan_shadow_to_mem((void *)KASAN_SHADOW_START));
151}
152
153void kasan_poison_shadow(const void *address, size_t size, u8 value);
154
155/**
156 * check_memory_region - Check memory region, and report if invalid access.
157 * @addr: the accessed address
158 * @size: the accessed size
159 * @write: true if access is a write access
160 * @ret_ip: return address
161 * @return: true if access was valid, false if invalid
162 */
163bool check_memory_region(unsigned long addr, size_t size, bool write,
164 unsigned long ret_ip);
165
166void *find_first_bad_addr(void *addr, size_t size);
167const char *get_bug_type(struct kasan_access_info *info);
168
169bool kasan_report(unsigned long addr, size_t size,
170 bool is_write, unsigned long ip);
171void kasan_report_invalid_free(void *object, unsigned long ip);
172
173struct page *kasan_addr_to_page(const void *addr);
174
175depot_stack_handle_t kasan_save_stack(gfp_t flags);
176void kasan_set_track(struct kasan_track *track, gfp_t flags);
177void kasan_set_free_info(struct kmem_cache *cache, void *object, u8 tag);
178struct kasan_track *kasan_get_free_track(struct kmem_cache *cache,
179 void *object, u8 tag);
180
181#if defined(CONFIG_KASAN_GENERIC) && \
182 (defined(CONFIG_SLAB) || defined(CONFIG_SLUB))
183void quarantine_put(struct kasan_free_meta *info, struct kmem_cache *cache);
184void quarantine_reduce(void);
185void quarantine_remove_cache(struct kmem_cache *cache);
186#else
187static inline void quarantine_put(struct kasan_free_meta *info,
188 struct kmem_cache *cache) { }
189static inline void quarantine_reduce(void) { }
190static inline void quarantine_remove_cache(struct kmem_cache *cache) { }
191#endif
192
193#ifdef CONFIG_KASAN_SW_TAGS
194
195void print_tags(u8 addr_tag, const void *addr);
196
197u8 random_tag(void);
198
199#else
200
201static inline void print_tags(u8 addr_tag, const void *addr) { }
202
203static inline u8 random_tag(void)
204{
205 return 0;
206}
207
208#endif
209
210#ifndef arch_kasan_set_tag
211static inline const void *arch_kasan_set_tag(const void *addr, u8 tag)
212{
213 return addr;
214}
215#endif
216#ifndef arch_kasan_reset_tag
217#define arch_kasan_reset_tag(addr) ((void *)(addr))
218#endif
219#ifndef arch_kasan_get_tag
220#define arch_kasan_get_tag(addr) 0
221#endif
222
223#define set_tag(addr, tag) ((void *)arch_kasan_set_tag((addr), (tag)))
224#define reset_tag(addr) ((void *)arch_kasan_reset_tag(addr))
225#define get_tag(addr) arch_kasan_get_tag(addr)
226
227/*
228 * Exported functions for interfaces called from assembly or from generated
229 * code. Declarations here to avoid warning about missing declarations.
230 */
231asmlinkage void kasan_unpoison_task_stack_below(const void *watermark);
232void __asan_register_globals(struct kasan_global *globals, size_t size);
233void __asan_unregister_globals(struct kasan_global *globals, size_t size);
234void __asan_handle_no_return(void);
235void __asan_alloca_poison(unsigned long addr, size_t size);
236void __asan_allocas_unpoison(const void *stack_top, const void *stack_bottom);
237
238void __asan_load1(unsigned long addr);
239void __asan_store1(unsigned long addr);
240void __asan_load2(unsigned long addr);
241void __asan_store2(unsigned long addr);
242void __asan_load4(unsigned long addr);
243void __asan_store4(unsigned long addr);
244void __asan_load8(unsigned long addr);
245void __asan_store8(unsigned long addr);
246void __asan_load16(unsigned long addr);
247void __asan_store16(unsigned long addr);
248void __asan_loadN(unsigned long addr, size_t size);
249void __asan_storeN(unsigned long addr, size_t size);
250
251void __asan_load1_noabort(unsigned long addr);
252void __asan_store1_noabort(unsigned long addr);
253void __asan_load2_noabort(unsigned long addr);
254void __asan_store2_noabort(unsigned long addr);
255void __asan_load4_noabort(unsigned long addr);
256void __asan_store4_noabort(unsigned long addr);
257void __asan_load8_noabort(unsigned long addr);
258void __asan_store8_noabort(unsigned long addr);
259void __asan_load16_noabort(unsigned long addr);
260void __asan_store16_noabort(unsigned long addr);
261void __asan_loadN_noabort(unsigned long addr, size_t size);
262void __asan_storeN_noabort(unsigned long addr, size_t size);
263
264void __asan_report_load1_noabort(unsigned long addr);
265void __asan_report_store1_noabort(unsigned long addr);
266void __asan_report_load2_noabort(unsigned long addr);
267void __asan_report_store2_noabort(unsigned long addr);
268void __asan_report_load4_noabort(unsigned long addr);
269void __asan_report_store4_noabort(unsigned long addr);
270void __asan_report_load8_noabort(unsigned long addr);
271void __asan_report_store8_noabort(unsigned long addr);
272void __asan_report_load16_noabort(unsigned long addr);
273void __asan_report_store16_noabort(unsigned long addr);
274void __asan_report_load_n_noabort(unsigned long addr, size_t size);
275void __asan_report_store_n_noabort(unsigned long addr, size_t size);
276
277void __asan_set_shadow_00(const void *addr, size_t size);
278void __asan_set_shadow_f1(const void *addr, size_t size);
279void __asan_set_shadow_f2(const void *addr, size_t size);
280void __asan_set_shadow_f3(const void *addr, size_t size);
281void __asan_set_shadow_f5(const void *addr, size_t size);
282void __asan_set_shadow_f8(const void *addr, size_t size);
283
284void __hwasan_load1_noabort(unsigned long addr);
285void __hwasan_store1_noabort(unsigned long addr);
286void __hwasan_load2_noabort(unsigned long addr);
287void __hwasan_store2_noabort(unsigned long addr);
288void __hwasan_load4_noabort(unsigned long addr);
289void __hwasan_store4_noabort(unsigned long addr);
290void __hwasan_load8_noabort(unsigned long addr);
291void __hwasan_store8_noabort(unsigned long addr);
292void __hwasan_load16_noabort(unsigned long addr);
293void __hwasan_store16_noabort(unsigned long addr);
294void __hwasan_loadN_noabort(unsigned long addr, size_t size);
295void __hwasan_storeN_noabort(unsigned long addr, size_t size);
296
297void __hwasan_tag_memory(unsigned long addr, u8 tag, unsigned long size);
298
299#endif