1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_STACKPROTECTOR_H
3#define _ASM_STACKPROTECTOR_H 1
4
5#include <linux/random.h>
6#include <linux/version.h>
7
8extern 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 */
16static __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 */
30