[linux-block.git] / include / linux / stackleak.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_STACKLEAK_H
#define _LINUX_STACKLEAK_H

#include <linux/sched.h>
#include <linux/sched/task_stack.h>

/*
 * Check that the poison value points to the unused hole in the
 * virtual memory map for your platform.
 */
#define STACKLEAK_POISON -0xBEEF
#define STACKLEAK_SEARCH_DEPTH 128

#ifdef CONFIG_GCC_PLUGIN_STACKLEAK
#include <asm/stacktrace.h>

static inline void stackleak_task_init(struct task_struct *t)
{
	t->lowest_stack = (unsigned long)end_of_stack(t) + sizeof(unsigned long);
# ifdef CONFIG_STACKLEAK_METRICS
	t->prev_lowest_stack = t->lowest_stack;
# endif
}

#ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
int stack_erasing_sysctl(struct ctl_table *table, int write,
			void __user *buffer, size_t *lenp, loff_t *ppos);
#endif

#else /* !CONFIG_GCC_PLUGIN_STACKLEAK */
static inline void stackleak_task_init(struct task_struct *t) { }
#endif

#endif
Commit	Line	Data
afaef01c AP	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	#ifndef _LINUX_STACKLEAK_H
	3	#define _LINUX_STACKLEAK_H
	4
	5	#include <linux/sched.h>
	6	#include <linux/sched/task_stack.h>
	7
	8	/*
	9	* Check that the poison value points to the unused hole in the
	10	* virtual memory map for your platform.
	11	*/
	12	#define STACKLEAK_POISON -0xBEEF
	13	#define STACKLEAK_SEARCH_DEPTH 128
	14
	15	#ifdef CONFIG_GCC_PLUGIN_STACKLEAK
	16	#include <asm/stacktrace.h>
	17
	18	static inline void stackleak_task_init(struct task_struct *t)
	19	{
	20	t->lowest_stack = (unsigned long)end_of_stack(t) + sizeof(unsigned long);
c8d12627 AP	21	# ifdef CONFIG_STACKLEAK_METRICS
	22	t->prev_lowest_stack = t->lowest_stack;
	23	# endif
afaef01c	24	}
964c9dff AP	25
	26	#ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
	27	int stack_erasing_sysctl(struct ctl_table *table, int write,
	28	void __user buffer, size_t lenp, loff_t *ppos);
	29	#endif
	30
afaef01c AP	31	#else /* !CONFIG_GCC_PLUGIN_STACKLEAK */
	32	static inline void stackleak_task_init(struct task_struct *t) { }
	33	#endif
	34
	35	#endif