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
   7 extern 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  */
  15 static __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 */