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
   8 extern 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  */
  16 static __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 */