Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_KASAN_ENABLED_H
3#define _LINUX_KASAN_ENABLED_H
4
5#include <linux/static_key.h>
6
7#if defined(CONFIG_ARCH_DEFER_KASAN) || defined(CONFIG_KASAN_HW_TAGS)
8/*
9 * Global runtime flag for KASAN modes that need runtime control.
10 * Used by ARCH_DEFER_KASAN architectures and HW_TAGS mode.
11 */
12DECLARE_STATIC_KEY_FALSE(kasan_flag_enabled);
13
14/*
15 * Runtime control for shadow memory initialization or HW_TAGS mode.
16 * Uses static key for architectures that need deferred KASAN or HW_TAGS.
17 */
18static __always_inline bool kasan_enabled(void)
19{
20 return static_branch_likely(&kasan_flag_enabled);
21}
22
23static inline void kasan_enable(void)
24{
25 static_branch_enable(&kasan_flag_enabled);
26}
27#else
28/* For architectures that can enable KASAN early, use compile-time check. */
29static __always_inline bool kasan_enabled(void)
30{
31 return IS_ENABLED(CONFIG_KASAN);
32}
33
34static inline void kasan_enable(void) {}
35#endif /* CONFIG_ARCH_DEFER_KASAN || CONFIG_KASAN_HW_TAGS */
36
37#ifdef CONFIG_KASAN_HW_TAGS
38static inline bool kasan_hw_tags_enabled(void)
39{
40 return kasan_enabled();
41}
42#else
43static inline bool kasan_hw_tags_enabled(void)
44{
45 return false;
46}
47#endif /* CONFIG_KASAN_HW_TAGS */
48
49#endif /* LINUX_KASAN_ENABLED_H */