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
9extern 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 */
17static __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	__stack_chk_guard = current->stack_canary;
28}
29#endif /* _ASM_RISCV_STACKPROTECTOR_H */
30