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

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