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>
15 #ifdef CONFIG_THREAD_INFO_IN_TASK
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.
21 #include <asm/current.h>
22 #define current_thread_info() ((struct thread_info *)current)
25 #include <linux/bitops.h>
28 * For per-arch arch_within_stack_frames() implementations, defined in
38 #ifdef CONFIG_GENERIC_ENTRY
39 enum syscall_work_bit {
40 SYSCALL_WORK_BIT_SECCOMP,
41 SYSCALL_WORK_BIT_SYSCALL_TRACEPOINT,
42 SYSCALL_WORK_BIT_SYSCALL_TRACE,
43 SYSCALL_WORK_BIT_SYSCALL_EMU,
44 SYSCALL_WORK_BIT_SYSCALL_AUDIT,
45 SYSCALL_WORK_BIT_SYSCALL_USER_DISPATCH,
48 #define SYSCALL_WORK_SECCOMP BIT(SYSCALL_WORK_BIT_SECCOMP)
49 #define SYSCALL_WORK_SYSCALL_TRACEPOINT BIT(SYSCALL_WORK_BIT_SYSCALL_TRACEPOINT)
50 #define SYSCALL_WORK_SYSCALL_TRACE BIT(SYSCALL_WORK_BIT_SYSCALL_TRACE)
51 #define SYSCALL_WORK_SYSCALL_EMU BIT(SYSCALL_WORK_BIT_SYSCALL_EMU)
52 #define SYSCALL_WORK_SYSCALL_AUDIT BIT(SYSCALL_WORK_BIT_SYSCALL_AUDIT)
53 #define SYSCALL_WORK_SYSCALL_USER_DISPATCH BIT(SYSCALL_WORK_BIT_SYSCALL_USER_DISPATCH)
56 #include <asm/thread_info.h>
61 #define THREAD_ALIGN THREAD_SIZE
64 #define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_ZERO)
67 * flag set/clear/test wrappers
68 * - pass TIF_xxxx constants to these functions
71 static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
73 set_bit(flag, (unsigned long *)&ti->flags);
76 static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
78 clear_bit(flag, (unsigned long *)&ti->flags);
81 static inline void update_ti_thread_flag(struct thread_info *ti, int flag,
85 set_ti_thread_flag(ti, flag);
87 clear_ti_thread_flag(ti, flag);
90 static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
92 return test_and_set_bit(flag, (unsigned long *)&ti->flags);
95 static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
97 return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
100 static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
102 return test_bit(flag, (unsigned long *)&ti->flags);
105 #define set_thread_flag(flag) \
106 set_ti_thread_flag(current_thread_info(), flag)
107 #define clear_thread_flag(flag) \
108 clear_ti_thread_flag(current_thread_info(), flag)
109 #define update_thread_flag(flag, value) \
110 update_ti_thread_flag(current_thread_info(), flag, value)
111 #define test_and_set_thread_flag(flag) \
112 test_and_set_ti_thread_flag(current_thread_info(), flag)
113 #define test_and_clear_thread_flag(flag) \
114 test_and_clear_ti_thread_flag(current_thread_info(), flag)
115 #define test_thread_flag(flag) \
116 test_ti_thread_flag(current_thread_info(), flag)
118 #ifdef CONFIG_GENERIC_ENTRY
119 #define set_syscall_work(fl) \
120 set_bit(SYSCALL_WORK_BIT_##fl, ¤t_thread_info()->syscall_work)
121 #define test_syscall_work(fl) \
122 test_bit(SYSCALL_WORK_BIT_##fl, ¤t_thread_info()->syscall_work)
123 #define clear_syscall_work(fl) \
124 clear_bit(SYSCALL_WORK_BIT_##fl, ¤t_thread_info()->syscall_work)
126 #define set_task_syscall_work(t, fl) \
127 set_bit(SYSCALL_WORK_BIT_##fl, &task_thread_info(t)->syscall_work)
128 #define test_task_syscall_work(t, fl) \
129 test_bit(SYSCALL_WORK_BIT_##fl, &task_thread_info(t)->syscall_work)
130 #define clear_task_syscall_work(t, fl) \
131 clear_bit(SYSCALL_WORK_BIT_##fl, &task_thread_info(t)->syscall_work)
133 #else /* CONFIG_GENERIC_ENTRY */
135 #define set_syscall_work(fl) \
136 set_ti_thread_flag(current_thread_info(), TIF_##fl)
137 #define test_syscall_work(fl) \
138 test_ti_thread_flag(current_thread_info(), TIF_##fl)
139 #define clear_syscall_work(fl) \
140 clear_ti_thread_flag(current_thread_info(), TIF_##fl)
142 #define set_task_syscall_work(t, fl) \
143 set_ti_thread_flag(task_thread_info(t), TIF_##fl)
144 #define test_task_syscall_work(t, fl) \
145 test_ti_thread_flag(task_thread_info(t), TIF_##fl)
146 #define clear_task_syscall_work(t, fl) \
147 clear_ti_thread_flag(task_thread_info(t), TIF_##fl)
148 #endif /* !CONFIG_GENERIC_ENTRY */
150 #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
152 #ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES
153 static inline int arch_within_stack_frames(const void * const stack,
154 const void * const stackend,
155 const void *obj, unsigned long len)
161 #ifdef CONFIG_HARDENED_USERCOPY
162 extern void __check_object_size(const void *ptr, unsigned long n,
165 static __always_inline void check_object_size(const void *ptr, unsigned long n,
168 if (!__builtin_constant_p(n))
169 __check_object_size(ptr, n, to_user);
172 static inline void check_object_size(const void *ptr, unsigned long n,
175 #endif /* CONFIG_HARDENED_USERCOPY */
177 extern void __compiletime_error("copy source size is too small")
178 __bad_copy_from(void);
179 extern void __compiletime_error("copy destination size is too small")
182 static inline void copy_overflow(int size, unsigned long count)
184 WARN(1, "Buffer overflow detected (%d < %lu)!\n", size, count);
187 static __always_inline __must_check bool
188 check_copy_size(const void *addr, size_t bytes, bool is_source)
190 int sz = __compiletime_object_size(addr);
191 if (unlikely(sz >= 0 && sz < bytes)) {
192 if (!__builtin_constant_p(bytes))
193 copy_overflow(sz, bytes);
200 if (WARN_ON_ONCE(bytes > INT_MAX))
202 check_object_size(addr, bytes, is_source);
206 #ifndef arch_setup_new_exec
207 static inline void arch_setup_new_exec(void) { }
210 #endif /* __KERNEL__ */
212 #endif /* _LINUX_THREAD_INFO_H */