blob: 68d4be9e125471562869d85b9973533ed534300d [file] [log] [blame]
/* SPDX-License-Identifier: GPL-2.0 */
* GCC stack protector support.
* (This is directly adopted from the ARM implementation)
* Stack protector works by putting predefined pattern at the start of
* the stack frame and verifying that it hasn't been overwritten when
* returning from the function. The pattern is called stack canary
* and gcc expects it to be defined by a global variable called
* "__stack_chk_guard" on MIPS. This unfortunately means that on SMP
* we cannot have a different canary value per task.
#include <linux/random.h>
#include <linux/version.h>
extern unsigned long __stack_chk_guard;
* Initialize the stackprotector canary value.
* NOTE: this must only be called from functions that never return,
* and it must always be inlined.
static __always_inline void boot_init_stack_canary(void)
unsigned long canary;
/* Try to get a semi random initial value. */
get_random_bytes(&canary, sizeof(canary));
current->stack_canary = canary;
__stack_chk_guard = current->stack_canary;