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/bug.h>
13 #include <linux/restart_block.h>
14 #include <linux/errno.h>
16 #ifdef CONFIG_THREAD_INFO_IN_TASK
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.
22 #include <asm/current.h>
23 #define current_thread_info() ((struct thread_info *)current)
26 #include <linux/bitops.h>
29 * For per-arch arch_within_stack_frames() implementations, defined in
39 #ifdef CONFIG_GENERIC_ENTRY
40 enum syscall_work_bit
{
41 SYSCALL_WORK_BIT_SECCOMP
,
42 SYSCALL_WORK_BIT_SYSCALL_TRACEPOINT
,
43 SYSCALL_WORK_BIT_SYSCALL_TRACE
,
44 SYSCALL_WORK_BIT_SYSCALL_EMU
,
45 SYSCALL_WORK_BIT_SYSCALL_AUDIT
,
46 SYSCALL_WORK_BIT_SYSCALL_USER_DISPATCH
,
47 SYSCALL_WORK_BIT_SYSCALL_EXIT_TRAP
,
50 #define SYSCALL_WORK_SECCOMP BIT(SYSCALL_WORK_BIT_SECCOMP)
51 #define SYSCALL_WORK_SYSCALL_TRACEPOINT BIT(SYSCALL_WORK_BIT_SYSCALL_TRACEPOINT)
52 #define SYSCALL_WORK_SYSCALL_TRACE BIT(SYSCALL_WORK_BIT_SYSCALL_TRACE)
53 #define SYSCALL_WORK_SYSCALL_EMU BIT(SYSCALL_WORK_BIT_SYSCALL_EMU)
54 #define SYSCALL_WORK_SYSCALL_AUDIT BIT(SYSCALL_WORK_BIT_SYSCALL_AUDIT)
55 #define SYSCALL_WORK_SYSCALL_USER_DISPATCH BIT(SYSCALL_WORK_BIT_SYSCALL_USER_DISPATCH)
56 #define SYSCALL_WORK_SYSCALL_EXIT_TRAP BIT(SYSCALL_WORK_BIT_SYSCALL_EXIT_TRAP)
59 #include <asm/thread_info.h>
63 #ifndef arch_set_restart_data
64 #define arch_set_restart_data(restart) do { } while (0)
67 static inline long set_restart_fn(struct restart_block
*restart
,
68 long (*fn
)(struct restart_block
*))
71 arch_set_restart_data(restart
);
72 return -ERESTART_RESTARTBLOCK
;
76 #define THREAD_ALIGN THREAD_SIZE
79 #define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_ZERO)
82 * flag set/clear/test wrappers
83 * - pass TIF_xxxx constants to these functions
86 static inline void set_ti_thread_flag(struct thread_info
*ti
, int flag
)
88 set_bit(flag
, (unsigned long *)&ti
->flags
);
91 static inline void clear_ti_thread_flag(struct thread_info
*ti
, int flag
)
93 clear_bit(flag
, (unsigned long *)&ti
->flags
);
96 static inline void update_ti_thread_flag(struct thread_info
*ti
, int flag
,
100 set_ti_thread_flag(ti
, flag
);
102 clear_ti_thread_flag(ti
, flag
);
105 static inline int test_and_set_ti_thread_flag(struct thread_info
*ti
, int flag
)
107 return test_and_set_bit(flag
, (unsigned long *)&ti
->flags
);
110 static inline int test_and_clear_ti_thread_flag(struct thread_info
*ti
, int flag
)
112 return test_and_clear_bit(flag
, (unsigned long *)&ti
->flags
);
115 static inline int test_ti_thread_flag(struct thread_info
*ti
, int flag
)
117 return test_bit(flag
, (unsigned long *)&ti
->flags
);
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)
124 #define update_thread_flag(flag, value) \
125 update_ti_thread_flag(current_thread_info(), flag, value)
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)
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)
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)
148 #else /* CONFIG_GENERIC_ENTRY */
150 #define set_syscall_work(fl) \
151 set_ti_thread_flag(current_thread_info(), TIF_##fl)
152 #define test_syscall_work(fl) \
153 test_ti_thread_flag(current_thread_info(), TIF_##fl)
154 #define clear_syscall_work(fl) \
155 clear_ti_thread_flag(current_thread_info(), TIF_##fl)
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 */
165 #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
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
)
176 #ifdef CONFIG_HARDENED_USERCOPY
177 extern void __check_object_size(const void *ptr
, unsigned long n
,
180 static __always_inline
void check_object_size(const void *ptr
, unsigned long n
,
183 if (!__builtin_constant_p(n
))
184 __check_object_size(ptr
, n
, to_user
);
187 static inline void check_object_size(const void *ptr
, unsigned long n
,
190 #endif /* CONFIG_HARDENED_USERCOPY */
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")
197 static inline void copy_overflow(int size
, unsigned long count
)
199 WARN(1, "Buffer overflow detected (%d < %lu)!\n", size
, count
);
202 static __always_inline __must_check
bool
203 check_copy_size(const void *addr
, size_t bytes
, bool is_source
)
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
);
215 if (WARN_ON_ONCE(bytes
> INT_MAX
))
217 check_object_size(addr
, bytes
, is_source
);
221 #ifndef arch_setup_new_exec
222 static inline void arch_setup_new_exec(void) { }
225 #endif /* __KERNEL__ */
227 #endif /* _LINUX_THREAD_INFO_H */