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1 | #ifndef LINUX_KMEMCHECK_H |
2 | #define LINUX_KMEMCHECK_H |
3 | |
4 | #include <linux/mm_types.h> |
5 | #include <linux/types.h> |
6 | |
7 | #ifdef CONFIG_KMEMCHECK |
8 | extern int kmemcheck_enabled; |
9 | |
10 | /* The slab-related functions. */ |
11 | void kmemcheck_alloc_shadow(struct page *page, int order, gfp_t flags, int node); |
12 | void kmemcheck_free_shadow(struct page *page, int order); |
13 | void kmemcheck_slab_alloc(struct kmem_cache *s, gfp_t gfpflags, void *object, |
14 | size_t size); |
15 | void kmemcheck_slab_free(struct kmem_cache *s, void *object, size_t size); |
16 | |
17 | void kmemcheck_pagealloc_alloc(struct page *p, unsigned int order, |
18 | gfp_t gfpflags); |
19 | |
20 | void kmemcheck_show_pages(struct page *p, unsigned int n); |
21 | void kmemcheck_hide_pages(struct page *p, unsigned int n); |
22 | |
23 | bool kmemcheck_page_is_tracked(struct page *p); |
24 | |
25 | void kmemcheck_mark_unallocated(void *address, unsigned int n); |
26 | void kmemcheck_mark_uninitialized(void *address, unsigned int n); |
27 | void kmemcheck_mark_initialized(void *address, unsigned int n); |
28 | void kmemcheck_mark_freed(void *address, unsigned int n); |
29 | |
30 | void kmemcheck_mark_unallocated_pages(struct page *p, unsigned int n); |
31 | void kmemcheck_mark_uninitialized_pages(struct page *p, unsigned int n); |
32 | void kmemcheck_mark_initialized_pages(struct page *p, unsigned int n); |
33 | |
34 | int kmemcheck_show_addr(unsigned long address); |
35 | int kmemcheck_hide_addr(unsigned long address); |
36 | |
37 | bool kmemcheck_is_obj_initialized(unsigned long addr, size_t size); |
38 | |
39 | /* |
40 | * Bitfield annotations |
41 | * |
42 | * How to use: If you have a struct using bitfields, for example |
43 | * |
44 | * struct a { |
45 | * int x:8, y:8; |
46 | * }; |
47 | * |
48 | * then this should be rewritten as |
49 | * |
50 | * struct a { |
51 | * kmemcheck_bitfield_begin(flags); |
52 | * int x:8, y:8; |
53 | * kmemcheck_bitfield_end(flags); |
54 | * }; |
55 | * |
56 | * Now the "flags_begin" and "flags_end" members may be used to refer to the |
57 | * beginning and end, respectively, of the bitfield (and things like |
58 | * &x.flags_begin is allowed). As soon as the struct is allocated, the bit- |
59 | * fields should be annotated: |
60 | * |
61 | * struct a *a = kmalloc(sizeof(struct a), GFP_KERNEL); |
62 | * kmemcheck_annotate_bitfield(a, flags); |
63 | */ |
64 | #define kmemcheck_bitfield_begin(name) \ |
65 | int name##_begin[0]; |
66 | |
67 | #define kmemcheck_bitfield_end(name) \ |
68 | int name##_end[0]; |
69 | |
70 | #define kmemcheck_annotate_bitfield(ptr, name) \ |
71 | do { \ |
72 | int _n; \ |
73 | \ |
74 | if (!ptr) \ |
75 | break; \ |
76 | \ |
77 | _n = (long) &((ptr)->name##_end) \ |
78 | - (long) &((ptr)->name##_begin); \ |
79 | BUILD_BUG_ON(_n < 0); \ |
80 | \ |
81 | kmemcheck_mark_initialized(&((ptr)->name##_begin), _n); \ |
82 | } while (0) |
83 | |
84 | #define kmemcheck_annotate_variable(var) \ |
85 | do { \ |
86 | kmemcheck_mark_initialized(&(var), sizeof(var)); \ |
87 | } while (0) \ |
88 | |
89 | #else |
90 | #define kmemcheck_enabled 0 |
91 | |
92 | static inline void |
93 | kmemcheck_alloc_shadow(struct page *page, int order, gfp_t flags, int node) |
94 | { |
95 | } |
96 | |
97 | static inline void |
98 | kmemcheck_free_shadow(struct page *page, int order) |
99 | { |
100 | } |
101 | |
102 | static inline void |
103 | kmemcheck_slab_alloc(struct kmem_cache *s, gfp_t gfpflags, void *object, |
104 | size_t size) |
105 | { |
106 | } |
107 | |
108 | static inline void kmemcheck_slab_free(struct kmem_cache *s, void *object, |
109 | size_t size) |
110 | { |
111 | } |
112 | |
113 | static inline void kmemcheck_pagealloc_alloc(struct page *p, |
114 | unsigned int order, gfp_t gfpflags) |
115 | { |
116 | } |
117 | |
118 | static inline bool kmemcheck_page_is_tracked(struct page *p) |
119 | { |
120 | return false; |
121 | } |
122 | |
123 | static inline void kmemcheck_mark_unallocated(void *address, unsigned int n) |
124 | { |
125 | } |
126 | |
127 | static inline void kmemcheck_mark_uninitialized(void *address, unsigned int n) |
128 | { |
129 | } |
130 | |
131 | static inline void kmemcheck_mark_initialized(void *address, unsigned int n) |
132 | { |
133 | } |
134 | |
135 | static inline void kmemcheck_mark_freed(void *address, unsigned int n) |
136 | { |
137 | } |
138 | |
139 | static inline void kmemcheck_mark_unallocated_pages(struct page *p, |
140 | unsigned int n) |
141 | { |
142 | } |
143 | |
144 | static inline void kmemcheck_mark_uninitialized_pages(struct page *p, |
145 | unsigned int n) |
146 | { |
147 | } |
148 | |
149 | static inline void kmemcheck_mark_initialized_pages(struct page *p, |
150 | unsigned int n) |
151 | { |
152 | } |
153 | |
154 | static inline bool kmemcheck_is_obj_initialized(unsigned long addr, size_t size) |
155 | { |
156 | return true; |
157 | } |
158 | |
159 | #define kmemcheck_bitfield_begin(name) |
160 | #define kmemcheck_bitfield_end(name) |
161 | #define kmemcheck_annotate_bitfield(ptr, name) \ |
162 | do { \ |
163 | } while (0) |
164 | |
165 | #define kmemcheck_annotate_variable(var) \ |
166 | do { \ |
167 | } while (0) |
168 | |
169 | #endif /* CONFIG_KMEMCHECK */ |
170 | |
171 | #endif /* LINUX_KMEMCHECK_H */ |
172 |
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