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
18static inline void stackleak_task_init(struct task_struct *t)
19{
20 t->lowest_stack = (unsigned long)end_of_stack(t) + sizeof(unsigned long);
21# ifdef CONFIG_STACKLEAK_METRICS
22 t->prev_lowest_stack = t->lowest_stack;
23# endif
24}
25
26#ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
27int stack_erasing_sysctl(struct ctl_table *table, int write,
28 void __user *buffer, size_t *lenp, loff_t *ppos);
29#endif
30
31#else /* !CONFIG_GCC_PLUGIN_STACKLEAK */
32static inline void stackleak_task_init(struct task_struct *t) { }
33#endif
34
35#endif
36