License cleanup: add SPDX GPL-2.0 license identifier to files with no license
[linux-block.git] / arch / sh / include / asm / stackprotector.h
1 /* SPDX-License-Identifier: GPL-2.0 */
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;
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 */