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#ifndef _LINUX_SAFESTACK_H
#define _LINUX_SAFESTACK_H
#ifdef CONFIG_SAFESTACK
#include <asm/safestack.h>
#define UNSAFE_STACK_END_MAGIC 0x5A78A200
extern void init_unsafe_stack_cache(void);
extern int alloc_unsafe_stack(struct task_struct *tsk, int node);
extern void free_unsafe_stack(struct task_struct *tsk);
static inline void set_unsafe_stack_end_magic(struct task_struct *tsk)
{
*(unsigned long *)tsk->unsafe_stack = UNSAFE_STACK_END_MAGIC;
}
static inline bool unsafe_stack_corrupted(struct task_struct *tsk)
{
return *(unsigned long *)tsk->unsafe_stack != UNSAFE_STACK_END_MAGIC;
}
static inline bool object_is_on_unsafe_stack(void *obj)
{
void *stack = current->unsafe_stack;
return obj >= stack && obj < (stack + UNSAFE_STACK_SIZE);
}
#ifdef CONFIG_DEBUG_STACK_USAGE
static inline unsigned long unsafe_stack_not_used(struct task_struct *tsk)
{
unsigned long *n = tsk->unsafe_stack;
unsigned long *end = tsk->unsafe_stack + UNSAFE_STACK_SIZE;
do { /* Skip over canary */
n++;
} while (n < end && !*n);
return (unsigned long)n - (unsigned long)tsk->unsafe_stack;
}
#endif
#else /* CONFIG_SAFESTACK */
#define UNSAFE_STACK_SIZE THREAD_SIZE
static inline void init_unsafe_stack_cache(void)
{
}
static inline int alloc_unsafe_stack(struct task_struct *tsk, int node)
{
return 0;
}
static inline void free_unsafe_stack(struct task_struct *tsk)
{
}
static inline void set_unsafe_stack_end_magic(struct task_struct *tsk)
{
}
static inline bool unsafe_stack_corrupted(struct task_struct *tsk)
{
return false;
}
static inline bool object_is_on_unsafe_stack(void *obj)
{
return false;
}
#ifdef CONFIG_DEBUG_STACK_USAGE
static inline unsigned long unsafe_stack_not_used(struct task_struct *tsk)
{
return UNSAFE_STACK_SIZE;
}
#endif
#endif /* CONFIG_SAFESTACK */
#endif /* _LINUX_SAFESTACK_H */
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