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 */ 12 DECLARE_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 */ kasan_enabled(void)18static __always_inline bool kasan_enabled(void) 19 { 20 return static_branch_likely(&kasan_flag_enabled); 21 } 22 kasan_enable(void)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. */ kasan_enabled(void)29static __always_inline bool kasan_enabled(void) 30 { 31 return IS_ENABLED(CONFIG_KASAN); 32 } 33 kasan_enable(void)34static inline void kasan_enable(void) {} 35 #endif /* CONFIG_ARCH_DEFER_KASAN || CONFIG_KASAN_HW_TAGS */ 36 37 #ifdef CONFIG_KASAN_HW_TAGS kasan_hw_tags_enabled(void)38static inline bool kasan_hw_tags_enabled(void) 39 { 40 return kasan_enabled(); 41 } 42 #else kasan_hw_tags_enabled(void)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 */ 50