1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* thread_info.h: common low-level thread information accessors
4 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
5 * - Incorporating suggestions made by Linus Torvalds
8 #ifndef _LINUX_THREAD_INFO_H
9 #define _LINUX_THREAD_INFO_H
11 #include <linux/types.h>
12 #include <linux/limits.h>
13 #include <linux/bug.h>
14 #include <linux/restart_block.h>
15 #include <linux/errno.h>
17 #ifdef CONFIG_THREAD_INFO_IN_TASK
19 * For CONFIG_THREAD_INFO_IN_TASK kernels we need <asm/current.h> for the
20 * definition of current, but for !CONFIG_THREAD_INFO_IN_TASK kernels,
21 * including <asm/current.h> can cause a circular dependency on some platforms.
23 #include <asm/current.h>
24 #define current_thread_info() ((struct thread_info *)current)
27 #include <linux/bitops.h>
30 * For per-arch arch_within_stack_frames() implementations, defined in
40 #ifdef CONFIG_GENERIC_ENTRY
41 enum syscall_work_bit
{
42 SYSCALL_WORK_BIT_SECCOMP
,
43 SYSCALL_WORK_BIT_SYSCALL_TRACEPOINT
,
44 SYSCALL_WORK_BIT_SYSCALL_TRACE
,
45 SYSCALL_WORK_BIT_SYSCALL_EMU
,
46 SYSCALL_WORK_BIT_SYSCALL_AUDIT
,
47 SYSCALL_WORK_BIT_SYSCALL_USER_DISPATCH
,
48 SYSCALL_WORK_BIT_SYSCALL_EXIT_TRAP
,
51 #define SYSCALL_WORK_SECCOMP BIT(SYSCALL_WORK_BIT_SECCOMP)
52 #define SYSCALL_WORK_SYSCALL_TRACEPOINT BIT(SYSCALL_WORK_BIT_SYSCALL_TRACEPOINT)
53 #define SYSCALL_WORK_SYSCALL_TRACE BIT(SYSCALL_WORK_BIT_SYSCALL_TRACE)
54 #define SYSCALL_WORK_SYSCALL_EMU BIT(SYSCALL_WORK_BIT_SYSCALL_EMU)
55 #define SYSCALL_WORK_SYSCALL_AUDIT BIT(SYSCALL_WORK_BIT_SYSCALL_AUDIT)
56 #define SYSCALL_WORK_SYSCALL_USER_DISPATCH BIT(SYSCALL_WORK_BIT_SYSCALL_USER_DISPATCH)
57 #define SYSCALL_WORK_SYSCALL_EXIT_TRAP BIT(SYSCALL_WORK_BIT_SYSCALL_EXIT_TRAP)
60 #include <asm/thread_info.h>
64 #ifndef arch_set_restart_data
65 #define arch_set_restart_data(restart) do { } while (0)
68 static inline long set_restart_fn(struct restart_block
*restart
,
69 long (*fn
)(struct restart_block
*))
72 arch_set_restart_data(restart
);
73 return -ERESTART_RESTARTBLOCK
;
77 #define THREAD_ALIGN THREAD_SIZE
80 #define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_ZERO)
83 * flag set/clear/test wrappers
84 * - pass TIF_xxxx constants to these functions
87 static inline void set_ti_thread_flag(struct thread_info
*ti
, int flag
)
89 set_bit(flag
, (unsigned long *)&ti
->flags
);
92 static inline void clear_ti_thread_flag(struct thread_info
*ti
, int flag
)
94 clear_bit(flag
, (unsigned long *)&ti
->flags
);
97 static inline void update_ti_thread_flag(struct thread_info
*ti
, int flag
,
101 set_ti_thread_flag(ti
, flag
);
103 clear_ti_thread_flag(ti
, flag
);
106 static inline int test_and_set_ti_thread_flag(struct thread_info
*ti
, int flag
)
108 return test_and_set_bit(flag
, (unsigned long *)&ti
->flags
);
111 static inline int test_and_clear_ti_thread_flag(struct thread_info
*ti
, int flag
)
113 return test_and_clear_bit(flag
, (unsigned long *)&ti
->flags
);
116 static inline int test_ti_thread_flag(struct thread_info
*ti
, int flag
)
118 return test_bit(flag
, (unsigned long *)&ti
->flags
);
121 #define set_thread_flag(flag) \
122 set_ti_thread_flag(current_thread_info(), flag)
123 #define clear_thread_flag(flag) \
124 clear_ti_thread_flag(current_thread_info(), flag)
125 #define update_thread_flag(flag, value) \
126 update_ti_thread_flag(current_thread_info(), flag, value)
127 #define test_and_set_thread_flag(flag) \
128 test_and_set_ti_thread_flag(current_thread_info(), flag)
129 #define test_and_clear_thread_flag(flag) \
130 test_and_clear_ti_thread_flag(current_thread_info(), flag)
131 #define test_thread_flag(flag) \
132 test_ti_thread_flag(current_thread_info(), flag)
134 #ifdef CONFIG_GENERIC_ENTRY
135 #define set_syscall_work(fl) \
136 set_bit(SYSCALL_WORK_BIT_##fl, ¤t_thread_info()->syscall_work)
137 #define test_syscall_work(fl) \
138 test_bit(SYSCALL_WORK_BIT_##fl, ¤t_thread_info()->syscall_work)
139 #define clear_syscall_work(fl) \
140 clear_bit(SYSCALL_WORK_BIT_##fl, ¤t_thread_info()->syscall_work)
142 #define set_task_syscall_work(t, fl) \
143 set_bit(SYSCALL_WORK_BIT_##fl, &task_thread_info(t)->syscall_work)
144 #define test_task_syscall_work(t, fl) \
145 test_bit(SYSCALL_WORK_BIT_##fl, &task_thread_info(t)->syscall_work)
146 #define clear_task_syscall_work(t, fl) \
147 clear_bit(SYSCALL_WORK_BIT_##fl, &task_thread_info(t)->syscall_work)
149 #else /* CONFIG_GENERIC_ENTRY */
151 #define set_syscall_work(fl) \
152 set_ti_thread_flag(current_thread_info(), TIF_##fl)
153 #define test_syscall_work(fl) \
154 test_ti_thread_flag(current_thread_info(), TIF_##fl)
155 #define clear_syscall_work(fl) \
156 clear_ti_thread_flag(current_thread_info(), TIF_##fl)
158 #define set_task_syscall_work(t, fl) \
159 set_ti_thread_flag(task_thread_info(t), TIF_##fl)
160 #define test_task_syscall_work(t, fl) \
161 test_ti_thread_flag(task_thread_info(t), TIF_##fl)
162 #define clear_task_syscall_work(t, fl) \
163 clear_ti_thread_flag(task_thread_info(t), TIF_##fl)
164 #endif /* !CONFIG_GENERIC_ENTRY */
166 #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
168 #ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES
169 static inline int arch_within_stack_frames(const void * const stack
,
170 const void * const stackend
,
171 const void *obj
, unsigned long len
)
177 #ifdef CONFIG_HARDENED_USERCOPY
178 extern void __check_object_size(const void *ptr
, unsigned long n
,
181 static __always_inline
void check_object_size(const void *ptr
, unsigned long n
,
184 if (!__builtin_constant_p(n
))
185 __check_object_size(ptr
, n
, to_user
);
188 static inline void check_object_size(const void *ptr
, unsigned long n
,
191 #endif /* CONFIG_HARDENED_USERCOPY */
193 extern void __compiletime_error("copy source size is too small")
194 __bad_copy_from(void);
195 extern void __compiletime_error("copy destination size is too small")
198 static inline void copy_overflow(int size
, unsigned long count
)
200 WARN(1, "Buffer overflow detected (%d < %lu)!\n", size
, count
);
203 static __always_inline __must_check
bool
204 check_copy_size(const void *addr
, size_t bytes
, bool is_source
)
206 int sz
= __compiletime_object_size(addr
);
207 if (unlikely(sz
>= 0 && sz
< bytes
)) {
208 if (!__builtin_constant_p(bytes
))
209 copy_overflow(sz
, bytes
);
216 if (WARN_ON_ONCE(bytes
> INT_MAX
))
218 check_object_size(addr
, bytes
, is_source
);
222 #ifndef arch_setup_new_exec
223 static inline void arch_setup_new_exec(void) { }
226 #endif /* __KERNEL__ */
228 #endif /* _LINUX_THREAD_INFO_H */