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 #include <asm/thread_info.h>
43 #define THREAD_ALIGN THREAD_SIZE
46 #if IS_ENABLED(CONFIG_DEBUG_STACK_USAGE) || IS_ENABLED(CONFIG_DEBUG_KMEMLEAK)
47 # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | \
50 # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK)
54 * flag set/clear/test wrappers
55 * - pass TIF_xxxx constants to these functions
58 static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
60 set_bit(flag, (unsigned long *)&ti->flags);
63 static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
65 clear_bit(flag, (unsigned long *)&ti->flags);
68 static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
70 return test_and_set_bit(flag, (unsigned long *)&ti->flags);
73 static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
75 return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
78 static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
80 return test_bit(flag, (unsigned long *)&ti->flags);
83 #define set_thread_flag(flag) \
84 set_ti_thread_flag(current_thread_info(), flag)
85 #define clear_thread_flag(flag) \
86 clear_ti_thread_flag(current_thread_info(), flag)
87 #define test_and_set_thread_flag(flag) \
88 test_and_set_ti_thread_flag(current_thread_info(), flag)
89 #define test_and_clear_thread_flag(flag) \
90 test_and_clear_ti_thread_flag(current_thread_info(), flag)
91 #define test_thread_flag(flag) \
92 test_ti_thread_flag(current_thread_info(), flag)
94 #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
96 #ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES
97 static inline int arch_within_stack_frames(const void * const stack,
98 const void * const stackend,
99 const void *obj, unsigned long len)
105 #ifdef CONFIG_HARDENED_USERCOPY
106 extern void __check_object_size(const void *ptr, unsigned long n,
109 static __always_inline void check_object_size(const void *ptr, unsigned long n,
112 if (!__builtin_constant_p(n))
113 __check_object_size(ptr, n, to_user);
116 static inline void check_object_size(const void *ptr, unsigned long n,
119 #endif /* CONFIG_HARDENED_USERCOPY */
121 extern void __compiletime_error("copy source size is too small")
122 __bad_copy_from(void);
123 extern void __compiletime_error("copy destination size is too small")
126 static inline void copy_overflow(int size, unsigned long count)
128 WARN(1, "Buffer overflow detected (%d < %lu)!\n", size, count);
131 static __always_inline bool
132 check_copy_size(const void *addr, size_t bytes, bool is_source)
134 int sz = __compiletime_object_size(addr);
135 if (unlikely(sz >= 0 && sz < bytes)) {
136 if (!__builtin_constant_p(bytes))
137 copy_overflow(sz, bytes);
144 check_object_size(addr, bytes, is_source);
148 #ifndef arch_setup_new_exec
149 static inline void arch_setup_new_exec(void) { }
152 #endif /* __KERNEL__ */
154 #endif /* _LINUX_THREAD_INFO_H */