LXR linux/include/linux/stackleak.h

   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 *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