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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_KASAN_H #define _LINUX_KASAN_H #include <linux/types.h> struct kmem_cache; struct page; struct vm_struct; struct task_struct; #ifdef CONFIG_KASAN #include <asm/kasan.h> #include <asm/pgtable.h> extern unsigned char kasan_early_shadow_page[PAGE_SIZE]; extern pte_t kasan_early_shadow_pte[PTRS_PER_PTE]; extern pmd_t kasan_early_shadow_pmd[PTRS_PER_PMD]; extern pud_t kasan_early_shadow_pud[PTRS_PER_PUD]; extern p4d_t kasan_early_shadow_p4d[MAX_PTRS_PER_P4D]; int kasan_populate_early_shadow(const void *shadow_start, const void *shadow_end); static inline void *kasan_mem_to_shadow(const void *addr) { return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT) + KASAN_SHADOW_OFFSET; } /* Enable reporting bugs after kasan_disable_current() */ extern void kasan_enable_current(void); /* Disable reporting bugs for current task */ extern void kasan_disable_current(void); void kasan_unpoison_shadow(const void *address, size_t size); void kasan_unpoison_task_stack(struct task_struct *task); void kasan_unpoison_stack_above_sp_to(const void *watermark); void kasan_alloc_pages(struct page *page, unsigned int order); void kasan_free_pages(struct page *page, unsigned int order); void kasan_cache_create(struct kmem_cache *cache, unsigned int *size, slab_flags_t *flags); void kasan_poison_slab(struct page *page); void kasan_unpoison_object_data(struct kmem_cache *cache, void *object); void kasan_poison_object_data(struct kmem_cache *cache, void *object); void * __must_check kasan_init_slab_obj(struct kmem_cache *cache, const void *object); void * __must_check kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags); void kasan_kfree_large(void *ptr, unsigned long ip); void kasan_poison_kfree(void *ptr, unsigned long ip); void * __must_check kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size, gfp_t flags); void * __must_check kasan_krealloc(const void *object, size_t new_size, gfp_t flags); void * __must_check kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags); bool kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip); struct kasan_cache { int alloc_meta_offset; int free_meta_offset; }; int kasan_module_alloc(void *addr, size_t size); void kasan_free_shadow(const struct vm_struct *vm); int kasan_add_zero_shadow(void *start, unsigned long size); void kasan_remove_zero_shadow(void *start, unsigned long size); size_t __ksize(const void *); static inline void kasan_unpoison_slab(const void *ptr) { kasan_unpoison_shadow(ptr, __ksize(ptr)); } size_t kasan_metadata_size(struct kmem_cache *cache); bool kasan_save_enable_multi_shot(void); void kasan_restore_multi_shot(bool enabled); #else /* CONFIG_KASAN */ static inline void kasan_unpoison_shadow(const void *address, size_t size) {} static inline void kasan_unpoison_task_stack(struct task_struct *task) {} static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {} static inline void kasan_enable_current(void) {} static inline void kasan_disable_current(void) {} static inline void kasan_alloc_pages(struct page *page, unsigned int order) {} static inline void kasan_free_pages(struct page *page, unsigned int order) {} static inline void kasan_cache_create(struct kmem_cache *cache, unsigned int *size, slab_flags_t *flags) {} static inline void kasan_poison_slab(struct page *page) {} static inline void kasan_unpoison_object_data(struct kmem_cache *cache, void *object) {} static inline void kasan_poison_object_data(struct kmem_cache *cache, void *object) {} static inline void *kasan_init_slab_obj(struct kmem_cache *cache, const void *object) { return (void *)object; } static inline void *kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) { return ptr; } static inline void kasan_kfree_large(void *ptr, unsigned long ip) {} static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {} static inline void *kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size, gfp_t flags) { return (void *)object; } static inline void *kasan_krealloc(const void *object, size_t new_size, gfp_t flags) { return (void *)object; } static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags) { return object; } static inline bool kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip) { return false; } static inline int kasan_module_alloc(void *addr, size_t size) { return 0; } static inline void kasan_free_shadow(const struct vm_struct *vm) {} static inline int kasan_add_zero_shadow(void *start, unsigned long size) { return 0; } static inline void kasan_remove_zero_shadow(void *start, unsigned long size) {} static inline void kasan_unpoison_slab(const void *ptr) { } static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; } #endif /* CONFIG_KASAN */ #ifdef CONFIG_KASAN_GENERIC #define KASAN_SHADOW_INIT 0 void kasan_cache_shrink(struct kmem_cache *cache); void kasan_cache_shutdown(struct kmem_cache *cache); #else /* CONFIG_KASAN_GENERIC */ static inline void kasan_cache_shrink(struct kmem_cache *cache) {} static inline void kasan_cache_shutdown(struct kmem_cache *cache) {} #endif /* CONFIG_KASAN_GENERIC */ #ifdef CONFIG_KASAN_SW_TAGS #define KASAN_SHADOW_INIT 0xFF void kasan_init_tags(void); void *kasan_reset_tag(const void *addr); void kasan_report(unsigned long addr, size_t size, bool is_write, unsigned long ip); #else /* CONFIG_KASAN_SW_TAGS */ static inline void kasan_init_tags(void) { } static inline void *kasan_reset_tag(const void *addr) { return (void *)addr; } #endif /* CONFIG_KASAN_SW_TAGS */ #endif /* LINUX_KASAN_H */
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