| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef _LINUX_KASAN_ENABLED_H |
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| 3 | #define _LINUX_KASAN_ENABLED_H |
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| 4 | |
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| 5 | #include <linux/static_key.h> |
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| 6 | |
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| 7 | #if defined(CONFIG_ARCH_DEFER_KASAN) || defined(CONFIG_KASAN_HW_TAGS) |
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| 8 | /* |
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| 9 | * Global runtime flag for KASAN modes that need runtime control. |
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| 10 | * Used by ARCH_DEFER_KASAN architectures and HW_TAGS mode. |
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| 11 | */ |
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| 12 | DECLARE_STATIC_KEY_FALSE(kasan_flag_enabled); |
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| 13 | |
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| 14 | /* |
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| 15 | * Runtime control for shadow memory initialization or HW_TAGS mode. |
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| 16 | * Uses static key for architectures that need deferred KASAN or HW_TAGS. |
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| 17 | */ |
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| 18 | static __always_inline bool kasan_enabled(void) |
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| 19 | { |
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| 20 | return static_branch_likely(&kasan_flag_enabled); |
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| 21 | } |
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| 22 | |
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| 23 | static inline void kasan_enable(void) |
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| 24 | { |
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| 25 | static_branch_enable(&kasan_flag_enabled); |
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| 26 | } |
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| 27 | #else |
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| 28 | /* For architectures that can enable KASAN early, use compile-time check. */ |
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| 29 | static __always_inline bool kasan_enabled(void) |
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| 30 | { |
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| 31 | return IS_ENABLED(CONFIG_KASAN); |
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| 32 | } |
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| 33 | |
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| 34 | static inline void kasan_enable(void) {} |
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| 35 | #endif /* CONFIG_ARCH_DEFER_KASAN || CONFIG_KASAN_HW_TAGS */ |
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| 36 | |
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| 37 | #ifdef CONFIG_KASAN_HW_TAGS |
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| 38 | static inline bool kasan_hw_tags_enabled(void) |
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| 39 | { |
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| 40 | return kasan_enabled(); |
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| 41 | } |
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| 42 | #else |
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| 43 | static inline bool kasan_hw_tags_enabled(void) |
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| 44 | { |
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| 45 | return false; |
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| 46 | } |
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| 47 | #endif /* CONFIG_KASAN_HW_TAGS */ |
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| 48 | |
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| 49 | #endif /* LINUX_KASAN_ENABLED_H */ |
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| 50 | |
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