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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> |
5abbe51a | 14 | #include <linux/errno.h> |
a332d86d | 15 | |
c65eacbe | 16 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
dc3d2a67 MR |
17 | /* |
18 | * For CONFIG_THREAD_INFO_IN_TASK kernels we need <asm/current.h> for the | |
19 | * definition of current, but for !CONFIG_THREAD_INFO_IN_TASK kernels, | |
20 | * including <asm/current.h> can cause a circular dependency on some platforms. | |
21 | */ | |
22 | #include <asm/current.h> | |
c65eacbe AL |
23 | #define current_thread_info() ((struct thread_info *)current) |
24 | #endif | |
25 | ||
1da177e4 | 26 | #include <linux/bitops.h> |
96dc4f9f S |
27 | |
28 | /* | |
29 | * For per-arch arch_within_stack_frames() implementations, defined in | |
30 | * asm/thread_info.h. | |
31 | */ | |
32 | enum { | |
33 | BAD_STACK = -1, | |
34 | NOT_STACK = 0, | |
35 | GOOD_FRAME, | |
36 | GOOD_STACK, | |
37 | }; | |
38 | ||
5903f61e | 39 | #ifdef CONFIG_GENERIC_ENTRY |
23d67a54 GKB |
40 | enum syscall_work_bit { |
41 | SYSCALL_WORK_BIT_SECCOMP, | |
524666cb | 42 | SYSCALL_WORK_BIT_SYSCALL_TRACEPOINT, |
64c19ba2 | 43 | SYSCALL_WORK_BIT_SYSCALL_TRACE, |
64eb35f7 | 44 | SYSCALL_WORK_BIT_SYSCALL_EMU, |
785dc4eb | 45 | SYSCALL_WORK_BIT_SYSCALL_AUDIT, |
1446e1df | 46 | SYSCALL_WORK_BIT_SYSCALL_USER_DISPATCH, |
6342adca | 47 | SYSCALL_WORK_BIT_SYSCALL_EXIT_TRAP, |
23d67a54 GKB |
48 | }; |
49 | ||
50 | #define SYSCALL_WORK_SECCOMP BIT(SYSCALL_WORK_BIT_SECCOMP) | |
524666cb | 51 | #define SYSCALL_WORK_SYSCALL_TRACEPOINT BIT(SYSCALL_WORK_BIT_SYSCALL_TRACEPOINT) |
64c19ba2 | 52 | #define SYSCALL_WORK_SYSCALL_TRACE BIT(SYSCALL_WORK_BIT_SYSCALL_TRACE) |
64eb35f7 | 53 | #define SYSCALL_WORK_SYSCALL_EMU BIT(SYSCALL_WORK_BIT_SYSCALL_EMU) |
785dc4eb | 54 | #define SYSCALL_WORK_SYSCALL_AUDIT BIT(SYSCALL_WORK_BIT_SYSCALL_AUDIT) |
1446e1df | 55 | #define SYSCALL_WORK_SYSCALL_USER_DISPATCH BIT(SYSCALL_WORK_BIT_SYSCALL_USER_DISPATCH) |
6342adca | 56 | #define SYSCALL_WORK_SYSCALL_EXIT_TRAP BIT(SYSCALL_WORK_BIT_SYSCALL_EXIT_TRAP) |
5903f61e | 57 | #endif |
23d67a54 | 58 | |
1da177e4 LT |
59 | #include <asm/thread_info.h> |
60 | ||
61 | #ifdef __KERNEL__ | |
62 | ||
5abbe51a ON |
63 | #ifndef arch_set_restart_data |
64 | #define arch_set_restart_data(restart) do { } while (0) | |
65 | #endif | |
66 | ||
67 | static inline long set_restart_fn(struct restart_block *restart, | |
68 | long (*fn)(struct restart_block *)) | |
69 | { | |
70 | restart->fn = fn; | |
71 | arch_set_restart_data(restart); | |
72 | return -ERESTART_RESTARTBLOCK; | |
73 | } | |
74 | ||
48ac3c18 MR |
75 | #ifndef THREAD_ALIGN |
76 | #define THREAD_ALIGN THREAD_SIZE | |
77 | #endif | |
78 | ||
e01e8063 | 79 | #define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_ZERO) |
2889f608 | 80 | |
1da177e4 LT |
81 | /* |
82 | * flag set/clear/test wrappers | |
83 | * - pass TIF_xxxx constants to these functions | |
84 | */ | |
85 | ||
1da177e4 LT |
86 | static inline void set_ti_thread_flag(struct thread_info *ti, int flag) |
87 | { | |
5548fecd | 88 | set_bit(flag, (unsigned long *)&ti->flags); |
1da177e4 LT |
89 | } |
90 | ||
91 | static inline void clear_ti_thread_flag(struct thread_info *ti, int flag) | |
92 | { | |
5548fecd | 93 | clear_bit(flag, (unsigned long *)&ti->flags); |
1da177e4 LT |
94 | } |
95 | ||
93ee37c2 DM |
96 | static inline void update_ti_thread_flag(struct thread_info *ti, int flag, |
97 | bool value) | |
98 | { | |
99 | if (value) | |
100 | set_ti_thread_flag(ti, flag); | |
101 | else | |
102 | clear_ti_thread_flag(ti, flag); | |
103 | } | |
104 | ||
1da177e4 LT |
105 | static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag) |
106 | { | |
5548fecd | 107 | return test_and_set_bit(flag, (unsigned long *)&ti->flags); |
1da177e4 LT |
108 | } |
109 | ||
110 | static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag) | |
111 | { | |
5548fecd | 112 | return test_and_clear_bit(flag, (unsigned long *)&ti->flags); |
1da177e4 LT |
113 | } |
114 | ||
115 | static inline int test_ti_thread_flag(struct thread_info *ti, int flag) | |
116 | { | |
5548fecd | 117 | return test_bit(flag, (unsigned long *)&ti->flags); |
1da177e4 LT |
118 | } |
119 | ||
3b66a1ed RZ |
120 | #define set_thread_flag(flag) \ |
121 | set_ti_thread_flag(current_thread_info(), flag) | |
122 | #define clear_thread_flag(flag) \ | |
123 | clear_ti_thread_flag(current_thread_info(), flag) | |
93ee37c2 DM |
124 | #define update_thread_flag(flag, value) \ |
125 | update_ti_thread_flag(current_thread_info(), flag, value) | |
3b66a1ed RZ |
126 | #define test_and_set_thread_flag(flag) \ |
127 | test_and_set_ti_thread_flag(current_thread_info(), flag) | |
128 | #define test_and_clear_thread_flag(flag) \ | |
129 | test_and_clear_ti_thread_flag(current_thread_info(), flag) | |
130 | #define test_thread_flag(flag) \ | |
131 | test_ti_thread_flag(current_thread_info(), flag) | |
132 | ||
3136b93c GKB |
133 | #ifdef CONFIG_GENERIC_ENTRY |
134 | #define set_syscall_work(fl) \ | |
135 | set_bit(SYSCALL_WORK_BIT_##fl, ¤t_thread_info()->syscall_work) | |
136 | #define test_syscall_work(fl) \ | |
137 | test_bit(SYSCALL_WORK_BIT_##fl, ¤t_thread_info()->syscall_work) | |
138 | #define clear_syscall_work(fl) \ | |
139 | clear_bit(SYSCALL_WORK_BIT_##fl, ¤t_thread_info()->syscall_work) | |
140 | ||
141 | #define set_task_syscall_work(t, fl) \ | |
142 | set_bit(SYSCALL_WORK_BIT_##fl, &task_thread_info(t)->syscall_work) | |
143 | #define test_task_syscall_work(t, fl) \ | |
144 | test_bit(SYSCALL_WORK_BIT_##fl, &task_thread_info(t)->syscall_work) | |
145 | #define clear_task_syscall_work(t, fl) \ | |
146 | clear_bit(SYSCALL_WORK_BIT_##fl, &task_thread_info(t)->syscall_work) | |
147 | ||
148 | #else /* CONFIG_GENERIC_ENTRY */ | |
149 | ||
150 | #define set_syscall_work(fl) \ | |
5903f61e | 151 | set_ti_thread_flag(current_thread_info(), TIF_##fl) |
3136b93c | 152 | #define test_syscall_work(fl) \ |
5903f61e | 153 | test_ti_thread_flag(current_thread_info(), TIF_##fl) |
3136b93c | 154 | #define clear_syscall_work(fl) \ |
5903f61e | 155 | clear_ti_thread_flag(current_thread_info(), TIF_##fl) |
3136b93c GKB |
156 | |
157 | #define set_task_syscall_work(t, fl) \ | |
158 | set_ti_thread_flag(task_thread_info(t), TIF_##fl) | |
159 | #define test_task_syscall_work(t, fl) \ | |
160 | test_ti_thread_flag(task_thread_info(t), TIF_##fl) | |
161 | #define clear_task_syscall_work(t, fl) \ | |
162 | clear_ti_thread_flag(task_thread_info(t), TIF_##fl) | |
163 | #endif /* !CONFIG_GENERIC_ENTRY */ | |
164 | ||
ea811747 PZ |
165 | #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED) |
166 | ||
0f60a8ef KC |
167 | #ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES |
168 | static inline int arch_within_stack_frames(const void * const stack, | |
169 | const void * const stackend, | |
170 | const void *obj, unsigned long len) | |
171 | { | |
172 | return 0; | |
173 | } | |
174 | #endif | |
175 | ||
f5509cc1 KC |
176 | #ifdef CONFIG_HARDENED_USERCOPY |
177 | extern void __check_object_size(const void *ptr, unsigned long n, | |
178 | bool to_user); | |
179 | ||
a85d6b82 KC |
180 | static __always_inline void check_object_size(const void *ptr, unsigned long n, |
181 | bool to_user) | |
f5509cc1 | 182 | { |
81409e9e KC |
183 | if (!__builtin_constant_p(n)) |
184 | __check_object_size(ptr, n, to_user); | |
f5509cc1 KC |
185 | } |
186 | #else | |
187 | static inline void check_object_size(const void *ptr, unsigned long n, | |
188 | bool to_user) | |
189 | { } | |
190 | #endif /* CONFIG_HARDENED_USERCOPY */ | |
191 | ||
b0377fed AV |
192 | extern void __compiletime_error("copy source size is too small") |
193 | __bad_copy_from(void); | |
194 | extern void __compiletime_error("copy destination size is too small") | |
195 | __bad_copy_to(void); | |
196 | ||
197 | static inline void copy_overflow(int size, unsigned long count) | |
198 | { | |
199 | WARN(1, "Buffer overflow detected (%d < %lu)!\n", size, count); | |
200 | } | |
201 | ||
9dd819a1 | 202 | static __always_inline __must_check bool |
b0377fed AV |
203 | check_copy_size(const void *addr, size_t bytes, bool is_source) |
204 | { | |
205 | int sz = __compiletime_object_size(addr); | |
206 | if (unlikely(sz >= 0 && sz < bytes)) { | |
207 | if (!__builtin_constant_p(bytes)) | |
208 | copy_overflow(sz, bytes); | |
209 | else if (is_source) | |
210 | __bad_copy_from(); | |
211 | else | |
212 | __bad_copy_to(); | |
213 | return false; | |
214 | } | |
6d13de14 KC |
215 | if (WARN_ON_ONCE(bytes > INT_MAX)) |
216 | return false; | |
b0377fed AV |
217 | check_object_size(addr, bytes, is_source); |
218 | return true; | |
219 | } | |
220 | ||
e9ea1e7f KH |
221 | #ifndef arch_setup_new_exec |
222 | static inline void arch_setup_new_exec(void) { } | |
223 | #endif | |
224 | ||
4e4c22c7 | 225 | #endif /* __KERNEL__ */ |
1da177e4 LT |
226 | |
227 | #endif /* _LINUX_THREAD_INFO_H */ |