5958cc49ed
- drop now unneeded is_vmalloc_or_module() check; Laura Abbott - use enum instead of literals for stack frame API; Sahara -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: Kees Cook <kees@outflux.net> iQIcBAABCgAGBQJZB39WAAoJEIly9N/cbcAmVJ8QALC0teqysiyml1CuxruXoXNj wPfwOJMypdXTYtL70ZKqi6Mboqrg01HTBeSNZjoNDvpHtsePlPVLjgDZ9ehcgokb nTQ23zJguV0nOLn32yKSJ1KupuxGMzW9RtrjOWH6w8nixff42vCHANY8+j5/Nx4R L4uLEPhA2ay35ddMeJMaNE8MAw7YS/C4enWu15CDbAjv++bVPoKwvqUchBoIPRx5 ZNjEUlAdnsv8IfccUea0Xz8CrBshe0kN4SGQvPqvaff2Orsk2FDHoK5wk6MaNN8L Dx2yZI5vxPbe6JYVEhvUxxGevuhmouTXf3UxBShOaggc4++/nuJ75S/nDIBosGrs EzWkRGn2JLr0+mKTCrjhbxBocstOsEIW6XSfEE2Sx4bBdj4LkcGoR/cCmTC8vjoL 82VaUnCVWyhwRgkowi4yJzE6iG5yQ8r6NpAPZsfYkgeOLFQ9uAy6pSceFRa1w38q vrysB+e0Dof6HRCd3UvbvGo94+ev4yc8niS70nFsVGhntRQYgPxKPRrzW+HdyWVp zA49P0FJgZu8a5jAbHwgv/J7ff2pfeM+ZhEX5XqR2EaMjAqLFI5QPJTFheSfjz6q 2Nbpbnq8PuIR4f1dgp3xbC1a2Lj8mzq+ek+SLMGAskMK+su8Niw38JQT/WGncqWy H134mG6dbjGH2HhGOQjD =zkvy -----END PGP SIGNATURE----- Merge tag 'usercopy-v4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux Pull hardened usercopy updates from Kees Cook: "A couple hardened usercopy changes: - drop now unneeded is_vmalloc_or_module() check (Laura Abbott) - use enum instead of literals for stack frame API (Sahara)" * tag 'usercopy-v4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: mm/usercopy: Drop extra is_vmalloc_or_module() check usercopy: Move enum for arch_within_stack_frames()
123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
/* 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__
|
|
|
|
#ifdef CONFIG_DEBUG_STACK_USAGE
|
|
# 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 */
|
|
|
|
#ifndef arch_setup_new_exec
|
|
static inline void arch_setup_new_exec(void) { }
|
|
#endif
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _LINUX_THREAD_INFO_H */
|