244 lines
7.2 KiB
C
244 lines
7.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_KASAN_H
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#define _LINUX_KASAN_H
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#include <linux/types.h>
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struct kmem_cache;
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struct page;
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struct vm_struct;
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struct task_struct;
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#ifdef CONFIG_KASAN
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#include <linux/pgtable.h>
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#include <asm/kasan.h>
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/* kasan_data struct is used in KUnit tests for KASAN expected failures */
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struct kunit_kasan_expectation {
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bool report_expected;
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bool report_found;
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};
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extern unsigned char kasan_early_shadow_page[PAGE_SIZE];
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extern pte_t kasan_early_shadow_pte[PTRS_PER_PTE];
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extern pmd_t kasan_early_shadow_pmd[PTRS_PER_PMD];
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extern pud_t kasan_early_shadow_pud[PTRS_PER_PUD];
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extern p4d_t kasan_early_shadow_p4d[MAX_PTRS_PER_P4D];
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int kasan_populate_early_shadow(const void *shadow_start,
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const void *shadow_end);
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static inline void *kasan_mem_to_shadow(const void *addr)
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{
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return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
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+ KASAN_SHADOW_OFFSET;
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}
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/* Enable reporting bugs after kasan_disable_current() */
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extern void kasan_enable_current(void);
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/* Disable reporting bugs for current task */
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extern void kasan_disable_current(void);
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void kasan_unpoison_shadow(const void *address, size_t size);
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void kasan_unpoison_task_stack(struct task_struct *task);
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void kasan_alloc_pages(struct page *page, unsigned int order);
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void kasan_free_pages(struct page *page, unsigned int order);
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void kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
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slab_flags_t *flags);
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void kasan_poison_slab(struct page *page);
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void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
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void kasan_poison_object_data(struct kmem_cache *cache, void *object);
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void * __must_check kasan_init_slab_obj(struct kmem_cache *cache,
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const void *object);
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void * __must_check kasan_kmalloc_large(const void *ptr, size_t size,
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gfp_t flags);
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void kasan_kfree_large(void *ptr, unsigned long ip);
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void kasan_poison_kfree(void *ptr, unsigned long ip);
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void * __must_check kasan_kmalloc(struct kmem_cache *s, const void *object,
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size_t size, gfp_t flags);
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void * __must_check kasan_krealloc(const void *object, size_t new_size,
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gfp_t flags);
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void * __must_check kasan_slab_alloc(struct kmem_cache *s, void *object,
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gfp_t flags);
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bool kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip);
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struct kasan_cache {
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int alloc_meta_offset;
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int free_meta_offset;
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};
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/*
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* These functions provide a special case to support backing module
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* allocations with real shadow memory. With KASAN vmalloc, the special
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* case is unnecessary, as the work is handled in the generic case.
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*/
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#ifndef CONFIG_KASAN_VMALLOC
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int kasan_module_alloc(void *addr, size_t size);
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void kasan_free_shadow(const struct vm_struct *vm);
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#else
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static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
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static inline void kasan_free_shadow(const struct vm_struct *vm) {}
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#endif
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int kasan_add_zero_shadow(void *start, unsigned long size);
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void kasan_remove_zero_shadow(void *start, unsigned long size);
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size_t __ksize(const void *);
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static inline void kasan_unpoison_slab(const void *ptr)
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{
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kasan_unpoison_shadow(ptr, __ksize(ptr));
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}
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size_t kasan_metadata_size(struct kmem_cache *cache);
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bool kasan_save_enable_multi_shot(void);
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void kasan_restore_multi_shot(bool enabled);
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#else /* CONFIG_KASAN */
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static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
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static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
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static inline void kasan_enable_current(void) {}
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static inline void kasan_disable_current(void) {}
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static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
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static inline void kasan_free_pages(struct page *page, unsigned int order) {}
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static inline void kasan_cache_create(struct kmem_cache *cache,
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unsigned int *size,
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slab_flags_t *flags) {}
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static inline void kasan_poison_slab(struct page *page) {}
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static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
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void *object) {}
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static inline void kasan_poison_object_data(struct kmem_cache *cache,
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void *object) {}
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static inline void *kasan_init_slab_obj(struct kmem_cache *cache,
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const void *object)
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{
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return (void *)object;
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}
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static inline void *kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags)
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{
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return ptr;
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}
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static inline void kasan_kfree_large(void *ptr, unsigned long ip) {}
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static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {}
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static inline void *kasan_kmalloc(struct kmem_cache *s, const void *object,
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size_t size, gfp_t flags)
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{
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return (void *)object;
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}
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static inline void *kasan_krealloc(const void *object, size_t new_size,
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gfp_t flags)
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{
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return (void *)object;
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}
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static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object,
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gfp_t flags)
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{
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return object;
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}
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static inline bool kasan_slab_free(struct kmem_cache *s, void *object,
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unsigned long ip)
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{
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return false;
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}
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static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
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static inline void kasan_free_shadow(const struct vm_struct *vm) {}
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static inline int kasan_add_zero_shadow(void *start, unsigned long size)
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{
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return 0;
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}
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static inline void kasan_remove_zero_shadow(void *start,
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unsigned long size)
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{}
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static inline void kasan_unpoison_slab(const void *ptr) { }
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static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
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#endif /* CONFIG_KASAN */
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#ifdef CONFIG_KASAN_GENERIC
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#define KASAN_SHADOW_INIT 0
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void kasan_cache_shrink(struct kmem_cache *cache);
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void kasan_cache_shutdown(struct kmem_cache *cache);
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void kasan_record_aux_stack(void *ptr);
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#else /* CONFIG_KASAN_GENERIC */
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static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
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static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
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static inline void kasan_record_aux_stack(void *ptr) {}
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#endif /* CONFIG_KASAN_GENERIC */
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#ifdef CONFIG_KASAN_SW_TAGS
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#define KASAN_SHADOW_INIT 0xFF
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void kasan_init_tags(void);
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void *kasan_reset_tag(const void *addr);
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bool kasan_report(unsigned long addr, size_t size,
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bool is_write, unsigned long ip);
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#else /* CONFIG_KASAN_SW_TAGS */
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static inline void kasan_init_tags(void) { }
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static inline void *kasan_reset_tag(const void *addr)
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{
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return (void *)addr;
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}
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#endif /* CONFIG_KASAN_SW_TAGS */
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#ifdef CONFIG_KASAN_VMALLOC
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int kasan_populate_vmalloc(unsigned long addr, unsigned long size);
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void kasan_poison_vmalloc(const void *start, unsigned long size);
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void kasan_unpoison_vmalloc(const void *start, unsigned long size);
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void kasan_release_vmalloc(unsigned long start, unsigned long end,
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unsigned long free_region_start,
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unsigned long free_region_end);
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#else
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static inline int kasan_populate_vmalloc(unsigned long start,
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unsigned long size)
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{
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return 0;
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}
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static inline void kasan_poison_vmalloc(const void *start, unsigned long size)
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{ }
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static inline void kasan_unpoison_vmalloc(const void *start, unsigned long size)
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{ }
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static inline void kasan_release_vmalloc(unsigned long start,
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unsigned long end,
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unsigned long free_region_start,
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unsigned long free_region_end) {}
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#endif
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#ifdef CONFIG_KASAN_INLINE
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void kasan_non_canonical_hook(unsigned long addr);
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#else /* CONFIG_KASAN_INLINE */
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static inline void kasan_non_canonical_hook(unsigned long addr) { }
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#endif /* CONFIG_KASAN_INLINE */
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#endif /* LINUX_KASAN_H */
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