| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* thread_info.h: common low-level thread information accessors |
| * |
| * Copyright (C) 2002 David Howells (dhowells@redhat.com) |
| * - Incorporating suggestions made by Linus Torvalds |
| */ |
| |
| #ifndef _LINUX_THREAD_INFO_H |
| #define _LINUX_THREAD_INFO_H |
| |
| #include <linux/types.h> |
| #include <linux/bug.h> |
| #include <linux/restart_block.h> |
| |
| #ifdef CONFIG_THREAD_INFO_IN_TASK |
| /* |
| * For CONFIG_THREAD_INFO_IN_TASK kernels we need <asm/current.h> for the |
| * definition of current, but for !CONFIG_THREAD_INFO_IN_TASK kernels, |
| * including <asm/current.h> can cause a circular dependency on some platforms. |
| */ |
| #include <asm/current.h> |
| #define current_thread_info() ((struct thread_info *)current) |
| #endif |
| |
| #include <linux/bitops.h> |
| |
| /* |
| * For per-arch arch_within_stack_frames() implementations, defined in |
| * asm/thread_info.h. |
| */ |
| enum { |
| BAD_STACK = -1, |
| NOT_STACK = 0, |
| GOOD_FRAME, |
| GOOD_STACK, |
| }; |
| |
| #include <asm/thread_info.h> |
| |
| #ifdef __KERNEL__ |
| |
| #ifndef THREAD_ALIGN |
| #define THREAD_ALIGN THREAD_SIZE |
| #endif |
| |
| #if IS_ENABLED(CONFIG_DEBUG_STACK_USAGE) || IS_ENABLED(CONFIG_DEBUG_KMEMLEAK) |
| # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | \ |
| __GFP_ZERO) |
| #else |
| # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK) |
| #endif |
| |
| /* |
| * flag set/clear/test wrappers |
| * - pass TIF_xxxx constants to these functions |
| */ |
| |
| static inline void set_ti_thread_flag(struct thread_info *ti, int flag) |
| { |
| set_bit(flag, (unsigned long *)&ti->flags); |
| } |
| |
| static inline void clear_ti_thread_flag(struct thread_info *ti, int flag) |
| { |
| clear_bit(flag, (unsigned long *)&ti->flags); |
| } |
| |
| static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag) |
| { |
| return test_and_set_bit(flag, (unsigned long *)&ti->flags); |
| } |
| |
| static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag) |
| { |
| return test_and_clear_bit(flag, (unsigned long *)&ti->flags); |
| } |
| |
| static inline int test_ti_thread_flag(struct thread_info *ti, int flag) |
| { |
| return test_bit(flag, (unsigned long *)&ti->flags); |
| } |
| |
| #define set_thread_flag(flag) \ |
| set_ti_thread_flag(current_thread_info(), flag) |
| #define clear_thread_flag(flag) \ |
| clear_ti_thread_flag(current_thread_info(), flag) |
| #define test_and_set_thread_flag(flag) \ |
| test_and_set_ti_thread_flag(current_thread_info(), flag) |
| #define test_and_clear_thread_flag(flag) \ |
| test_and_clear_ti_thread_flag(current_thread_info(), flag) |
| #define test_thread_flag(flag) \ |
| test_ti_thread_flag(current_thread_info(), flag) |
| |
| #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED) |
| |
| #ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES |
| static inline int arch_within_stack_frames(const void * const stack, |
| const void * const stackend, |
| const void *obj, unsigned long len) |
| { |
| return 0; |
| } |
| #endif |
| |
| #ifdef CONFIG_HARDENED_USERCOPY |
| extern void __check_object_size(const void *ptr, unsigned long n, |
| bool to_user); |
| |
| static __always_inline void check_object_size(const void *ptr, unsigned long n, |
| bool to_user) |
| { |
| if (!__builtin_constant_p(n)) |
| __check_object_size(ptr, n, to_user); |
| } |
| #else |
| static inline void check_object_size(const void *ptr, unsigned long n, |
| bool to_user) |
| { } |
| #endif /* CONFIG_HARDENED_USERCOPY */ |
| |
| extern void __compiletime_error("copy source size is too small") |
| __bad_copy_from(void); |
| extern void __compiletime_error("copy destination size is too small") |
| __bad_copy_to(void); |
| |
| static inline void copy_overflow(int size, unsigned long count) |
| { |
| WARN(1, "Buffer overflow detected (%d < %lu)!\n", size, count); |
| } |
| |
| static __always_inline bool |
| check_copy_size(const void *addr, size_t bytes, bool is_source) |
| { |
| int sz = __compiletime_object_size(addr); |
| if (unlikely(sz >= 0 && sz < bytes)) { |
| if (!__builtin_constant_p(bytes)) |
| copy_overflow(sz, bytes); |
| else if (is_source) |
| __bad_copy_from(); |
| else |
| __bad_copy_to(); |
| return false; |
| } |
| check_object_size(addr, bytes, is_source); |
| return true; |
| } |
| |
| #ifndef arch_setup_new_exec |
| static inline void arch_setup_new_exec(void) { } |
| #endif |
| |
| #endif /* __KERNEL__ */ |
| |
| #endif /* _LINUX_THREAD_INFO_H */ |