Release 4.14 include/linux/thread_info.h
/* 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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 25 | 83.33% | 1 | 50.00% |
| Jeremy Fitzhardinge | 5 | 16.67% | 1 | 50.00% |
| Total | 30 | 100.00% | 2 | 100.00% |
static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
{
clear_bit(flag, (unsigned long *)&ti->flags);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 25 | 83.33% | 1 | 50.00% |
| Jeremy Fitzhardinge | 5 | 16.67% | 1 | 50.00% |
| Total | 30 | 100.00% | 2 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 26 | 83.87% | 1 | 50.00% |
| Jeremy Fitzhardinge | 5 | 16.13% | 1 | 50.00% |
| Total | 31 | 100.00% | 2 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 26 | 83.87% | 1 | 50.00% |
| Jeremy Fitzhardinge | 5 | 16.13% | 1 | 50.00% |
| Total | 31 | 100.00% | 2 | 100.00% |
static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
{
return test_bit(flag, (unsigned long *)&ti->flags);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 26 | 83.87% | 1 | 50.00% |
| Jeremy Fitzhardinge | 5 | 16.13% | 1 | 50.00% |
| Total | 31 | 100.00% | 2 | 100.00% |
#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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Kees Cook | 31 | 100.00% | 1 | 100.00% |
| Total | 31 | 100.00% | 1 | 100.00% |
#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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Kees Cook | 36 | 100.00% | 3 | 100.00% |
| Total | 36 | 100.00% | 3 | 100.00% |
#else
static inline void check_object_size(const void *ptr, unsigned long n,
bool to_user)
{ }
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Kees Cook | 18 | 100.00% | 1 | 100.00% |
| Total | 18 | 100.00% | 1 | 100.00% |
#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);
}
Contributors
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| Al Viro | 25 | 100.00% | 1 | 100.00% |
| Total | 25 | 100.00% | 1 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Al Viro | 83 | 100.00% | 1 | 100.00% |
| Total | 83 | 100.00% | 1 | 100.00% |
#ifndef arch_setup_new_exec
static inline void arch_setup_new_exec(void) { }
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Kyle Huey | 8 | 100.00% | 1 | 100.00% |
| Total | 8 | 100.00% | 1 | 100.00% |
#endif
#endif /* __KERNEL__ */
#endif /* _LINUX_THREAD_INFO_H */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 150 | 27.17% | 1 | 4.35% |
| Al Viro | 133 | 24.09% | 2 | 8.70% |
| Kees Cook | 115 | 20.83% | 4 | 17.39% |
| Roman Zippel | 36 | 6.52% | 1 | 4.35% |
| Jeremy Fitzhardinge | 25 | 4.53% | 1 | 4.35% |
| Keun-o Park | 17 | 3.08% | 1 | 4.35% |
| Mark Rutland | 16 | 2.90% | 3 | 13.04% |
| Kyle Huey | 13 | 2.36% | 1 | 4.35% |
| Thomas Gleixner | 11 | 1.99% | 1 | 4.35% |
| Andrew Lutomirski | 10 | 1.81% | 1 | 4.35% |
| Konstantin Khlebnikov | 10 | 1.81% | 1 | 4.35% |
| Peter Zijlstra | 5 | 0.91% | 1 | 4.35% |
| Steven Rostedt | 3 | 0.54% | 1 | 4.35% |
| Roland McGrath | 3 | 0.54% | 1 | 4.35% |
| Vladimir Davydov | 2 | 0.36% | 1 | 4.35% |
| Hirofumi Ogawa | 2 | 0.36% | 1 | 4.35% |
| Greg Kroah-Hartman | 1 | 0.18% | 1 | 4.35% |
| Total | 552 | 100.00% | 23 | 100.00% |
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