Linux kernel mirror (for testing)
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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 if (!IS_ENABLED(CONFIG_STACKPROTECTOR_PER_TASK))
28 __stack_chk_guard = current->stack_canary;
29}
30#endif /* _ASM_RISCV_STACKPROTECTOR_H */