shstk.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _ASM_X86_SHSTK_H
 3#define _ASM_X86_SHSTK_H
 4
 5#ifndef __ASSEMBLER__
 6#include <linux/types.h>
 7
 8struct task_struct;
 9struct ksignal;
10
11#ifdef CONFIG_X86_USER_SHADOW_STACK
12struct thread_shstk {
13	u64	base;
14	u64	size;
15};
16
17long shstk_prctl(struct task_struct *task, int option, unsigned long arg2);
18void reset_thread_features(void);
19unsigned long shstk_alloc_thread_stack(struct task_struct *p, u64 clone_flags,
20				       unsigned long stack_size);
21void shstk_free(struct task_struct *p);
22int setup_signal_shadow_stack(struct ksignal *ksig);
23int restore_signal_shadow_stack(void);
24int shstk_update_last_frame(unsigned long val);
25bool shstk_is_enabled(void);
26int shstk_pop(u64 *val);
27int shstk_push(u64 val);
28#else
29static inline long shstk_prctl(struct task_struct *task, int option,
30			       unsigned long arg2) { return -EINVAL; }
31static inline void reset_thread_features(void) {}
32static inline unsigned long shstk_alloc_thread_stack(struct task_struct *p,
33						     u64 clone_flags,
34						     unsigned long stack_size) { return 0; }
35static inline void shstk_free(struct task_struct *p) {}
36static inline int setup_signal_shadow_stack(struct ksignal *ksig) { return 0; }
37static inline int restore_signal_shadow_stack(void) { return 0; }
38static inline int shstk_update_last_frame(unsigned long val) { return 0; }
39static inline bool shstk_is_enabled(void) { return false; }
40static inline int shstk_pop(u64 *val) { return -ENOTSUPP; }
41static inline int shstk_push(u64 val) { return -ENOTSUPP; }
42#endif /* CONFIG_X86_USER_SHADOW_STACK */
43
44#endif /* __ASSEMBLER__ */
45
46#endif /* _ASM_X86_SHSTK_H */