LXR linux/arch/sh/include/asm/stackprotector.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __ASM_SH_STACKPROTECTOR_H
   3#define __ASM_SH_STACKPROTECTOR_H
   4
   5#include <linux/random.h>
   6#include <linux/version.h>
   7
   8extern unsigned long __stack_chk_guard;
   9
  10/*
  11 * Initialize the stackprotector canary value.
  12 *
  13 * NOTE: this must only be called from functions that never return,
  14 * and it must always be inlined.
  15 */
  16static __always_inline void boot_init_stack_canary(void)
  17{
  18        unsigned long canary;
  19
  20        /* Try to get a semi random initial value. */
  21        get_random_bytes(&canary, sizeof(canary));
  22        canary ^= LINUX_VERSION_CODE;
  23        canary &= CANARY_MASK;
  24
  25        current->stack_canary = canary;
  26        __stack_chk_guard = current->stack_canary;
  27}
  28
  29#endif /* __ASM_SH_STACKPROTECTOR_H */
  30