| /* |
| * Shadow Call Stack support. |
| * |
| * Copyright (C) 2018 Google LLC |
| */ |
| |
| #ifndef _LINUX_SCS_H |
| #define _LINUX_SCS_H |
| |
| #ifdef CONFIG_SHADOW_CALL_STACK |
| |
| #include <linux/gfp.h> |
| #include <linux/sched.h> |
| #include <asm/page.h> |
| |
| #define SCS_SIZE 1024 |
| #define SCS_GFP (GFP_KERNEL | __GFP_ZERO) |
| |
| extern unsigned long init_shadow_call_stack[]; |
| |
| static inline void *task_scs(struct task_struct *tsk) |
| { |
| return task_thread_info(tsk)->shadow_call_stack; |
| } |
| |
| static inline void task_set_scs(struct task_struct *tsk, void *s) |
| { |
| task_thread_info(tsk)->shadow_call_stack = s; |
| } |
| |
| extern void scs_set_init_magic(struct task_struct *tsk); |
| extern void scs_task_init(struct task_struct *tsk); |
| extern void scs_task_reset(struct task_struct *tsk); |
| extern int scs_prepare(struct task_struct *tsk, int node); |
| extern bool scs_corrupted(struct task_struct *tsk); |
| extern void scs_release(struct task_struct *tsk); |
| |
| #else /* CONFIG_SHADOW_CALL_STACK */ |
| |
| static inline void *task_scs(struct task_struct *tsk) |
| { |
| return 0; |
| } |
| |
| static inline void task_set_scs(struct task_struct *tsk, void *s) |
| { |
| } |
| |
| static inline void scs_set_init_magic(struct task_struct *tsk) |
| { |
| } |
| |
| static inline void scs_task_init(struct task_struct *tsk) |
| { |
| } |
| |
| static inline void scs_task_reset(struct task_struct *tsk) |
| { |
| } |
| |
| static inline int scs_prepare(struct task_struct *tsk, int node) |
| { |
| return 0; |
| } |
| |
| static inline bool scs_corrupted(struct task_struct *tsk) |
| { |
| return false; |
| } |
| |
| static inline void scs_release(struct task_struct *tsk) |
| { |
| } |
| |
| #endif /* CONFIG_SHADOW_CALL_STACK */ |
| |
| #endif /* _LINUX_SCS_H */ |
