1 /* SPDX-License-Identifier: GPL-2.0 */
2 
3 #ifndef _ASM_RISCV_STACKPROTECTOR_H
4 #define _ASM_RISCV_STACKPROTECTOR_H
5 
6 #include <linux/random.h>
7 #include <linux/version.h>
8 
9 extern unsigned long __stack_chk_guard;
10 
11 /*
12  * Initialize the stackprotector canary value.
13  *
14  * NOTE: this must only be called from functions that never return,
15  * and it must always be inlined.
16  */
17 static __always_inline void boot_init_stack_canary(void)
18 {
19 	unsigned long canary;
20 
21 	/* Try to get a semi random initial value. */
22 	get_random_bytes(&canary, sizeof(canary));
23 	canary ^= LINUX_VERSION_CODE;
24 	canary &= CANARY_MASK;
25 
26 	current->stack_canary = canary;
27 	if (!IS_ENABLED(CONFIG_STACKPROTECTOR_PER_TASK))
28 		__stack_chk_guard = current->stack_canary;
29 }
30 #endif /* _ASM_RISCV_STACKPROTECTOR_H */
31