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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
9b5609fd IM |
2 | #ifndef _LINUX_STACKPROTECTOR_H |
3 | #define _LINUX_STACKPROTECTOR_H 1 | |
4 | ||
42059429 IM |
5 | #include <linux/compiler.h> |
6 | #include <linux/sched.h> | |
7 | #include <linux/random.h> | |
8 | ||
b3883a9a JD |
9 | /* |
10 | * On 64-bit architectures, protect against non-terminated C string overflows | |
11 | * by zeroing out the first byte of the canary; this leaves 56 bits of entropy. | |
12 | */ | |
13 | #ifdef CONFIG_64BIT | |
14 | # ifdef __LITTLE_ENDIAN | |
15 | # define CANARY_MASK 0xffffffffffffff00UL | |
16 | # else /* big endian, 64 bits: */ | |
17 | # define CANARY_MASK 0x00ffffffffffffffUL | |
18 | # endif | |
19 | #else /* 32 bits: */ | |
20 | # define CANARY_MASK 0xffffffffUL | |
21 | #endif | |
22 | ||
23 | static inline unsigned long get_random_canary(void) | |
24 | { | |
25 | return get_random_long() & CANARY_MASK; | |
26 | } | |
27 | ||
28321582 | 28 | #if defined(CONFIG_STACKPROTECTOR) || defined(CONFIG_ARM64_PTR_AUTH) |
9b5609fd | 29 | # include <asm/stackprotector.h> |
18aa8bb1 IM |
30 | #else |
31 | static inline void boot_init_stack_canary(void) | |
32 | { | |
33 | } | |
9b5609fd IM |
34 | #endif |
35 | ||
36 | #endif |