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227 lines
6.5 KiB
227 lines
6.5 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* thread_info.h: common low-level thread information accessors |
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* |
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* Copyright (C) 2002 David Howells ([email protected]) |
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* - Incorporating suggestions made by Linus Torvalds |
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*/ |
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#ifndef _LINUX_THREAD_INFO_H |
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#define _LINUX_THREAD_INFO_H |
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#include <linux/types.h> |
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#include <linux/bug.h> |
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#include <linux/restart_block.h> |
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#include <linux/errno.h> |
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#ifdef CONFIG_THREAD_INFO_IN_TASK |
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/* |
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* For CONFIG_THREAD_INFO_IN_TASK kernels we need <asm/current.h> for the |
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* definition of current, but for !CONFIG_THREAD_INFO_IN_TASK kernels, |
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* including <asm/current.h> can cause a circular dependency on some platforms. |
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*/ |
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#include <asm/current.h> |
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#define current_thread_info() ((struct thread_info *)current) |
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#endif |
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#include <linux/bitops.h> |
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/* |
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* For per-arch arch_within_stack_frames() implementations, defined in |
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* asm/thread_info.h. |
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*/ |
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enum { |
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BAD_STACK = -1, |
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NOT_STACK = 0, |
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GOOD_FRAME, |
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GOOD_STACK, |
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}; |
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#ifdef CONFIG_GENERIC_ENTRY |
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enum syscall_work_bit { |
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SYSCALL_WORK_BIT_SECCOMP, |
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SYSCALL_WORK_BIT_SYSCALL_TRACEPOINT, |
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SYSCALL_WORK_BIT_SYSCALL_TRACE, |
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SYSCALL_WORK_BIT_SYSCALL_EMU, |
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SYSCALL_WORK_BIT_SYSCALL_AUDIT, |
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SYSCALL_WORK_BIT_SYSCALL_USER_DISPATCH, |
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SYSCALL_WORK_BIT_SYSCALL_EXIT_TRAP, |
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}; |
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#define SYSCALL_WORK_SECCOMP BIT(SYSCALL_WORK_BIT_SECCOMP) |
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#define SYSCALL_WORK_SYSCALL_TRACEPOINT BIT(SYSCALL_WORK_BIT_SYSCALL_TRACEPOINT) |
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#define SYSCALL_WORK_SYSCALL_TRACE BIT(SYSCALL_WORK_BIT_SYSCALL_TRACE) |
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#define SYSCALL_WORK_SYSCALL_EMU BIT(SYSCALL_WORK_BIT_SYSCALL_EMU) |
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#define SYSCALL_WORK_SYSCALL_AUDIT BIT(SYSCALL_WORK_BIT_SYSCALL_AUDIT) |
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#define SYSCALL_WORK_SYSCALL_USER_DISPATCH BIT(SYSCALL_WORK_BIT_SYSCALL_USER_DISPATCH) |
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#define SYSCALL_WORK_SYSCALL_EXIT_TRAP BIT(SYSCALL_WORK_BIT_SYSCALL_EXIT_TRAP) |
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#endif |
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#include <asm/thread_info.h> |
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#ifdef __KERNEL__ |
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#ifndef arch_set_restart_data |
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#define arch_set_restart_data(restart) do { } while (0) |
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#endif |
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static inline long set_restart_fn(struct restart_block *restart, |
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long (*fn)(struct restart_block *)) |
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{ |
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restart->fn = fn; |
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arch_set_restart_data(restart); |
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return -ERESTART_RESTARTBLOCK; |
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} |
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#ifndef THREAD_ALIGN |
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#define THREAD_ALIGN THREAD_SIZE |
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#endif |
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#define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_ZERO) |
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/* |
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* flag set/clear/test wrappers |
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* - pass TIF_xxxx constants to these functions |
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*/ |
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static inline void set_ti_thread_flag(struct thread_info *ti, int flag) |
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{ |
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set_bit(flag, (unsigned long *)&ti->flags); |
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} |
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static inline void clear_ti_thread_flag(struct thread_info *ti, int flag) |
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{ |
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clear_bit(flag, (unsigned long *)&ti->flags); |
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} |
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static inline void update_ti_thread_flag(struct thread_info *ti, int flag, |
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bool value) |
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{ |
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if (value) |
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set_ti_thread_flag(ti, flag); |
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else |
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clear_ti_thread_flag(ti, flag); |
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} |
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static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag) |
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{ |
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return test_and_set_bit(flag, (unsigned long *)&ti->flags); |
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} |
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static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag) |
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{ |
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return test_and_clear_bit(flag, (unsigned long *)&ti->flags); |
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} |
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static inline int test_ti_thread_flag(struct thread_info *ti, int flag) |
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{ |
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return test_bit(flag, (unsigned long *)&ti->flags); |
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} |
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#define set_thread_flag(flag) \ |
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set_ti_thread_flag(current_thread_info(), flag) |
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#define clear_thread_flag(flag) \ |
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clear_ti_thread_flag(current_thread_info(), flag) |
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#define update_thread_flag(flag, value) \ |
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update_ti_thread_flag(current_thread_info(), flag, value) |
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#define test_and_set_thread_flag(flag) \ |
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test_and_set_ti_thread_flag(current_thread_info(), flag) |
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#define test_and_clear_thread_flag(flag) \ |
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test_and_clear_ti_thread_flag(current_thread_info(), flag) |
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#define test_thread_flag(flag) \ |
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test_ti_thread_flag(current_thread_info(), flag) |
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#ifdef CONFIG_GENERIC_ENTRY |
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#define set_syscall_work(fl) \ |
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set_bit(SYSCALL_WORK_BIT_##fl, ¤t_thread_info()->syscall_work) |
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#define test_syscall_work(fl) \ |
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test_bit(SYSCALL_WORK_BIT_##fl, ¤t_thread_info()->syscall_work) |
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#define clear_syscall_work(fl) \ |
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clear_bit(SYSCALL_WORK_BIT_##fl, ¤t_thread_info()->syscall_work) |
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#define set_task_syscall_work(t, fl) \ |
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set_bit(SYSCALL_WORK_BIT_##fl, &task_thread_info(t)->syscall_work) |
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#define test_task_syscall_work(t, fl) \ |
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test_bit(SYSCALL_WORK_BIT_##fl, &task_thread_info(t)->syscall_work) |
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#define clear_task_syscall_work(t, fl) \ |
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clear_bit(SYSCALL_WORK_BIT_##fl, &task_thread_info(t)->syscall_work) |
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#else /* CONFIG_GENERIC_ENTRY */ |
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#define set_syscall_work(fl) \ |
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set_ti_thread_flag(current_thread_info(), TIF_##fl) |
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#define test_syscall_work(fl) \ |
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test_ti_thread_flag(current_thread_info(), TIF_##fl) |
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#define clear_syscall_work(fl) \ |
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clear_ti_thread_flag(current_thread_info(), TIF_##fl) |
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#define set_task_syscall_work(t, fl) \ |
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set_ti_thread_flag(task_thread_info(t), TIF_##fl) |
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#define test_task_syscall_work(t, fl) \ |
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test_ti_thread_flag(task_thread_info(t), TIF_##fl) |
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#define clear_task_syscall_work(t, fl) \ |
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clear_ti_thread_flag(task_thread_info(t), TIF_##fl) |
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#endif /* !CONFIG_GENERIC_ENTRY */ |
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#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED) |
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#ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES |
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static inline int arch_within_stack_frames(const void * const stack, |
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const void * const stackend, |
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const void *obj, unsigned long len) |
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{ |
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return 0; |
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} |
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#endif |
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#ifdef CONFIG_HARDENED_USERCOPY |
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extern void __check_object_size(const void *ptr, unsigned long n, |
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bool to_user); |
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static __always_inline void check_object_size(const void *ptr, unsigned long n, |
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bool to_user) |
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{ |
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if (!__builtin_constant_p(n)) |
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__check_object_size(ptr, n, to_user); |
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} |
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#else |
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static inline void check_object_size(const void *ptr, unsigned long n, |
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bool to_user) |
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{ } |
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#endif /* CONFIG_HARDENED_USERCOPY */ |
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extern void __compiletime_error("copy source size is too small") |
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__bad_copy_from(void); |
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extern void __compiletime_error("copy destination size is too small") |
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__bad_copy_to(void); |
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static inline void copy_overflow(int size, unsigned long count) |
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{ |
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WARN(1, "Buffer overflow detected (%d < %lu)!\n", size, count); |
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} |
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static __always_inline __must_check bool |
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check_copy_size(const void *addr, size_t bytes, bool is_source) |
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{ |
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int sz = __compiletime_object_size(addr); |
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if (unlikely(sz >= 0 && sz < bytes)) { |
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if (!__builtin_constant_p(bytes)) |
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copy_overflow(sz, bytes); |
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else if (is_source) |
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__bad_copy_from(); |
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else |
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__bad_copy_to(); |
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return false; |
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} |
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if (WARN_ON_ONCE(bytes > INT_MAX)) |
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return false; |
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check_object_size(addr, bytes, is_source); |
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return true; |
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} |
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#ifndef arch_setup_new_exec |
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static inline void arch_setup_new_exec(void) { } |
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#endif |
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#endif /* __KERNEL__ */ |
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#endif /* _LINUX_THREAD_INFO_H */
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