Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /* thread_info.h: common low-level thread information accessors |
3 | * | |
4 | * Copyright (C) 2002 David Howells (dhowells@redhat.com) | |
5 | * - Incorporating suggestions made by Linus Torvalds | |
6 | */ | |
7 | ||
8 | #ifndef _LINUX_THREAD_INFO_H | |
9 | #define _LINUX_THREAD_INFO_H | |
10 | ||
ce6bd420 | 11 | #include <linux/types.h> |
edd63a27 | 12 | #include <linux/bug.h> |
53d74d05 | 13 | #include <linux/restart_block.h> |
a332d86d | 14 | |
c65eacbe | 15 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
dc3d2a67 MR |
16 | /* |
17 | * For CONFIG_THREAD_INFO_IN_TASK kernels we need <asm/current.h> for the | |
18 | * definition of current, but for !CONFIG_THREAD_INFO_IN_TASK kernels, | |
19 | * including <asm/current.h> can cause a circular dependency on some platforms. | |
20 | */ | |
21 | #include <asm/current.h> | |
c65eacbe AL |
22 | #define current_thread_info() ((struct thread_info *)current) |
23 | #endif | |
24 | ||
1da177e4 | 25 | #include <linux/bitops.h> |
96dc4f9f S |
26 | |
27 | /* | |
28 | * For per-arch arch_within_stack_frames() implementations, defined in | |
29 | * asm/thread_info.h. | |
30 | */ | |
31 | enum { | |
32 | BAD_STACK = -1, | |
33 | NOT_STACK = 0, | |
34 | GOOD_FRAME, | |
35 | GOOD_STACK, | |
36 | }; | |
37 | ||
1da177e4 LT |
38 | #include <asm/thread_info.h> |
39 | ||
40 | #ifdef __KERNEL__ | |
41 | ||
48ac3c18 MR |
42 | #ifndef THREAD_ALIGN |
43 | #define THREAD_ALIGN THREAD_SIZE | |
44 | #endif | |
45 | ||
e01e8063 | 46 | #define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_ZERO) |
2889f608 | 47 | |
1da177e4 LT |
48 | /* |
49 | * flag set/clear/test wrappers | |
50 | * - pass TIF_xxxx constants to these functions | |
51 | */ | |
52 | ||
1da177e4 LT |
53 | static inline void set_ti_thread_flag(struct thread_info *ti, int flag) |
54 | { | |
5548fecd | 55 | set_bit(flag, (unsigned long *)&ti->flags); |
1da177e4 LT |
56 | } |
57 | ||
58 | static inline void clear_ti_thread_flag(struct thread_info *ti, int flag) | |
59 | { | |
5548fecd | 60 | clear_bit(flag, (unsigned long *)&ti->flags); |
1da177e4 LT |
61 | } |
62 | ||
93ee37c2 DM |
63 | static inline void update_ti_thread_flag(struct thread_info *ti, int flag, |
64 | bool value) | |
65 | { | |
66 | if (value) | |
67 | set_ti_thread_flag(ti, flag); | |
68 | else | |
69 | clear_ti_thread_flag(ti, flag); | |
70 | } | |
71 | ||
1da177e4 LT |
72 | static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag) |
73 | { | |
5548fecd | 74 | return test_and_set_bit(flag, (unsigned long *)&ti->flags); |
1da177e4 LT |
75 | } |
76 | ||
77 | static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag) | |
78 | { | |
5548fecd | 79 | return test_and_clear_bit(flag, (unsigned long *)&ti->flags); |
1da177e4 LT |
80 | } |
81 | ||
82 | static inline int test_ti_thread_flag(struct thread_info *ti, int flag) | |
83 | { | |
5548fecd | 84 | return test_bit(flag, (unsigned long *)&ti->flags); |
1da177e4 LT |
85 | } |
86 | ||
3b66a1ed RZ |
87 | #define set_thread_flag(flag) \ |
88 | set_ti_thread_flag(current_thread_info(), flag) | |
89 | #define clear_thread_flag(flag) \ | |
90 | clear_ti_thread_flag(current_thread_info(), flag) | |
93ee37c2 DM |
91 | #define update_thread_flag(flag, value) \ |
92 | update_ti_thread_flag(current_thread_info(), flag, value) | |
3b66a1ed RZ |
93 | #define test_and_set_thread_flag(flag) \ |
94 | test_and_set_ti_thread_flag(current_thread_info(), flag) | |
95 | #define test_and_clear_thread_flag(flag) \ | |
96 | test_and_clear_ti_thread_flag(current_thread_info(), flag) | |
97 | #define test_thread_flag(flag) \ | |
98 | test_ti_thread_flag(current_thread_info(), flag) | |
99 | ||
ea811747 PZ |
100 | #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED) |
101 | ||
0f60a8ef KC |
102 | #ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES |
103 | static inline int arch_within_stack_frames(const void * const stack, | |
104 | const void * const stackend, | |
105 | const void *obj, unsigned long len) | |
106 | { | |
107 | return 0; | |
108 | } | |
109 | #endif | |
110 | ||
f5509cc1 KC |
111 | #ifdef CONFIG_HARDENED_USERCOPY |
112 | extern void __check_object_size(const void *ptr, unsigned long n, | |
113 | bool to_user); | |
114 | ||
a85d6b82 KC |
115 | static __always_inline void check_object_size(const void *ptr, unsigned long n, |
116 | bool to_user) | |
f5509cc1 | 117 | { |
81409e9e KC |
118 | if (!__builtin_constant_p(n)) |
119 | __check_object_size(ptr, n, to_user); | |
f5509cc1 KC |
120 | } |
121 | #else | |
122 | static inline void check_object_size(const void *ptr, unsigned long n, | |
123 | bool to_user) | |
124 | { } | |
125 | #endif /* CONFIG_HARDENED_USERCOPY */ | |
126 | ||
b0377fed AV |
127 | extern void __compiletime_error("copy source size is too small") |
128 | __bad_copy_from(void); | |
129 | extern void __compiletime_error("copy destination size is too small") | |
130 | __bad_copy_to(void); | |
131 | ||
132 | static inline void copy_overflow(int size, unsigned long count) | |
133 | { | |
134 | WARN(1, "Buffer overflow detected (%d < %lu)!\n", size, count); | |
135 | } | |
136 | ||
137 | static __always_inline bool | |
138 | check_copy_size(const void *addr, size_t bytes, bool is_source) | |
139 | { | |
140 | int sz = __compiletime_object_size(addr); | |
141 | if (unlikely(sz >= 0 && sz < bytes)) { | |
142 | if (!__builtin_constant_p(bytes)) | |
143 | copy_overflow(sz, bytes); | |
144 | else if (is_source) | |
145 | __bad_copy_from(); | |
146 | else | |
147 | __bad_copy_to(); | |
148 | return false; | |
149 | } | |
150 | check_object_size(addr, bytes, is_source); | |
151 | return true; | |
152 | } | |
153 | ||
e9ea1e7f KH |
154 | #ifndef arch_setup_new_exec |
155 | static inline void arch_setup_new_exec(void) { } | |
156 | #endif | |
157 | ||
4e4c22c7 | 158 | #endif /* __KERNEL__ */ |
1da177e4 LT |
159 | |
160 | #endif /* _LINUX_THREAD_INFO_H */ |