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/*
* 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 */
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