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
  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);
  21 # ifdef CONFIG_STACKLEAK_METRICS
  22         t->prev_lowest_stack = t->lowest_stack;
  23 # endif
  24 }
  25
  26 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
  27 int 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 */
  32 static inline void stackleak_task_init(struct task_struct *t) { }
  33 #endif
  34
  35 #endif