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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
5d920bb9 FA |
2 | #ifndef __ASM_SH_STACKPROTECTOR_H |
3 | #define __ASM_SH_STACKPROTECTOR_H | |
4 | ||
5 | #include <linux/random.h> | |
6 | #include <linux/version.h> | |
7 | ||
8 | extern 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 | */ | |
16 | static __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; | |
2c8340ed | 23 | canary &= CANARY_MASK; |
5d920bb9 FA |
24 | |
25 | current->stack_canary = canary; | |
26 | __stack_chk_guard = current->stack_canary; | |
27 | } | |
28 | ||
29 | #endif /* __ASM_SH_STACKPROTECTOR_H */ |