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 */ 28