602 lines
19 KiB
C
602 lines
19 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/bug.h>
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#include <linux/kasan-enabled.h>
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#include <linux/kasan-tags.h>
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#include <linux/kernel.h>
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#include <linux/static_key.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 slab;
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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/linkage.h>
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#include <asm/kasan.h>
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#endif
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typedef unsigned int __bitwise kasan_vmalloc_flags_t;
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#define KASAN_VMALLOC_NONE ((__force kasan_vmalloc_flags_t)0x00u)
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#define KASAN_VMALLOC_INIT ((__force kasan_vmalloc_flags_t)0x01u)
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#define KASAN_VMALLOC_VM_ALLOC ((__force kasan_vmalloc_flags_t)0x02u)
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#define KASAN_VMALLOC_PROT_NORMAL ((__force kasan_vmalloc_flags_t)0x04u)
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#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
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#include <linux/pgtable.h>
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/* Software KASAN implementations use shadow memory. */
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#ifdef CONFIG_KASAN_SW_TAGS
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/* This matches KASAN_TAG_INVALID. */
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#define KASAN_SHADOW_INIT 0xFE
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#else
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#define KASAN_SHADOW_INIT 0
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#endif
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#ifndef PTE_HWTABLE_PTRS
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#define PTE_HWTABLE_PTRS 0
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#endif
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extern unsigned char kasan_early_shadow_page[PAGE_SIZE];
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extern pte_t kasan_early_shadow_pte[MAX_PTRS_PER_PTE + PTE_HWTABLE_PTRS];
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extern pmd_t kasan_early_shadow_pmd[MAX_PTRS_PER_PMD];
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extern pud_t kasan_early_shadow_pud[MAX_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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#ifndef kasan_mem_to_shadow
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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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#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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/* 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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#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
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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_enable_current(void) {}
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static inline void kasan_disable_current(void) {}
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#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
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#ifdef CONFIG_KASAN_HW_TAGS
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#else /* CONFIG_KASAN_HW_TAGS */
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#endif /* CONFIG_KASAN_HW_TAGS */
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static inline bool kasan_has_integrated_init(void)
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{
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return kasan_hw_tags_enabled();
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}
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#ifdef CONFIG_KASAN
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void __kasan_unpoison_range(const void *addr, size_t size);
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static __always_inline void kasan_unpoison_range(const void *addr, size_t size)
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{
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if (kasan_enabled())
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__kasan_unpoison_range(addr, size);
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}
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void __kasan_poison_pages(struct page *page, unsigned int order, bool init);
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static __always_inline void kasan_poison_pages(struct page *page,
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unsigned int order, bool init)
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{
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if (kasan_enabled())
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__kasan_poison_pages(page, order, init);
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}
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bool __kasan_unpoison_pages(struct page *page, unsigned int order, bool init);
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static __always_inline bool kasan_unpoison_pages(struct page *page,
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unsigned int order, bool init)
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{
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if (kasan_enabled())
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return __kasan_unpoison_pages(page, order, init);
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return false;
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}
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void __kasan_poison_slab(struct slab *slab);
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static __always_inline void kasan_poison_slab(struct slab *slab)
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{
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if (kasan_enabled())
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__kasan_poison_slab(slab);
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}
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void __kasan_unpoison_new_object(struct kmem_cache *cache, void *object);
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/**
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* kasan_unpoison_new_object - Temporarily unpoison a new slab object.
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* @cache: Cache the object belong to.
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* @object: Pointer to the object.
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*
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* This function is intended for the slab allocator's internal use. It
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* temporarily unpoisons an object from a newly allocated slab without doing
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* anything else. The object must later be repoisoned by
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* kasan_poison_new_object().
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*/
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static __always_inline void kasan_unpoison_new_object(struct kmem_cache *cache,
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void *object)
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{
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if (kasan_enabled())
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__kasan_unpoison_new_object(cache, object);
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}
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void __kasan_poison_new_object(struct kmem_cache *cache, void *object);
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/**
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* kasan_unpoison_new_object - Repoison a new slab object.
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* @cache: Cache the object belong to.
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* @object: Pointer to the object.
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*
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* This function is intended for the slab allocator's internal use. It
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* repoisons an object that was previously unpoisoned by
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* kasan_unpoison_new_object() without doing anything else.
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*/
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static __always_inline void kasan_poison_new_object(struct kmem_cache *cache,
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void *object)
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{
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if (kasan_enabled())
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__kasan_poison_new_object(cache, object);
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}
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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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static __always_inline void * __must_check kasan_init_slab_obj(
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struct kmem_cache *cache, const void *object)
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{
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if (kasan_enabled())
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return __kasan_init_slab_obj(cache, object);
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return (void *)object;
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}
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bool __kasan_slab_free(struct kmem_cache *s, void *object,
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unsigned long ip, bool init);
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static __always_inline bool kasan_slab_free(struct kmem_cache *s,
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void *object, bool init)
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{
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if (kasan_enabled())
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return __kasan_slab_free(s, object, _RET_IP_, init);
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return false;
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}
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void __kasan_kfree_large(void *ptr, unsigned long ip);
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static __always_inline void kasan_kfree_large(void *ptr)
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{
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if (kasan_enabled())
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__kasan_kfree_large(ptr, _RET_IP_);
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}
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void * __must_check __kasan_slab_alloc(struct kmem_cache *s,
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void *object, gfp_t flags, bool init);
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static __always_inline void * __must_check kasan_slab_alloc(
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struct kmem_cache *s, void *object, gfp_t flags, bool init)
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{
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if (kasan_enabled())
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return __kasan_slab_alloc(s, object, flags, init);
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return object;
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}
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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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static __always_inline void * __must_check kasan_kmalloc(struct kmem_cache *s,
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const void *object, size_t size, gfp_t flags)
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{
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if (kasan_enabled())
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return __kasan_kmalloc(s, object, size, flags);
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return (void *)object;
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}
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void * __must_check __kasan_kmalloc_large(const void *ptr,
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size_t size, gfp_t flags);
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static __always_inline void * __must_check kasan_kmalloc_large(const void *ptr,
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size_t size, gfp_t flags)
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{
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if (kasan_enabled())
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return __kasan_kmalloc_large(ptr, size, flags);
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return (void *)ptr;
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}
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void * __must_check __kasan_krealloc(const void *object,
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size_t new_size, gfp_t flags);
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static __always_inline void * __must_check kasan_krealloc(const void *object,
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size_t new_size, gfp_t flags)
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{
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if (kasan_enabled())
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return __kasan_krealloc(object, new_size, flags);
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return (void *)object;
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}
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bool __kasan_mempool_poison_pages(struct page *page, unsigned int order,
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unsigned long ip);
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/**
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* kasan_mempool_poison_pages - Check and poison a mempool page allocation.
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* @page: Pointer to the page allocation.
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* @order: Order of the allocation.
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*
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* This function is intended for kernel subsystems that cache page allocations
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* to reuse them instead of freeing them back to page_alloc (e.g. mempool).
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*
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* This function is similar to kasan_mempool_poison_object() but operates on
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* page allocations.
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*
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* Before the poisoned allocation can be reused, it must be unpoisoned via
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* kasan_mempool_unpoison_pages().
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*
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* Return: true if the allocation can be safely reused; false otherwise.
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*/
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static __always_inline bool kasan_mempool_poison_pages(struct page *page,
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unsigned int order)
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{
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if (kasan_enabled())
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return __kasan_mempool_poison_pages(page, order, _RET_IP_);
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return true;
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}
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void __kasan_mempool_unpoison_pages(struct page *page, unsigned int order,
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unsigned long ip);
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/**
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* kasan_mempool_unpoison_pages - Unpoison a mempool page allocation.
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* @page: Pointer to the page allocation.
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* @order: Order of the allocation.
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*
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* This function is intended for kernel subsystems that cache page allocations
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* to reuse them instead of freeing them back to page_alloc (e.g. mempool).
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*
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* This function unpoisons a page allocation that was previously poisoned by
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* kasan_mempool_poison_pages() without zeroing the allocation's memory. For
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* the tag-based modes, this function assigns a new tag to the allocation.
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*/
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static __always_inline void kasan_mempool_unpoison_pages(struct page *page,
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unsigned int order)
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{
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if (kasan_enabled())
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__kasan_mempool_unpoison_pages(page, order, _RET_IP_);
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}
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bool __kasan_mempool_poison_object(void *ptr, unsigned long ip);
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/**
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* kasan_mempool_poison_object - Check and poison a mempool slab allocation.
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* @ptr: Pointer to the slab allocation.
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*
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* This function is intended for kernel subsystems that cache slab allocations
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* to reuse them instead of freeing them back to the slab allocator (e.g.
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* mempool).
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*
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* This function poisons a slab allocation and saves a free stack trace for it
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* without initializing the allocation's memory and without putting it into the
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* quarantine (for the Generic mode).
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*
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* This function also performs checks to detect double-free and invalid-free
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* bugs and reports them. The caller can use the return value of this function
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* to find out if the allocation is buggy.
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*
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* Before the poisoned allocation can be reused, it must be unpoisoned via
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* kasan_mempool_unpoison_object().
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*
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* This function operates on all slab allocations including large kmalloc
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* allocations (the ones returned by kmalloc_large() or by kmalloc() with the
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* size > KMALLOC_MAX_SIZE).
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*
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* Return: true if the allocation can be safely reused; false otherwise.
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*/
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static __always_inline bool kasan_mempool_poison_object(void *ptr)
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{
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if (kasan_enabled())
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return __kasan_mempool_poison_object(ptr, _RET_IP_);
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return true;
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}
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void __kasan_mempool_unpoison_object(void *ptr, size_t size, unsigned long ip);
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/**
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* kasan_mempool_unpoison_object - Unpoison a mempool slab allocation.
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* @ptr: Pointer to the slab allocation.
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* @size: Size to be unpoisoned.
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*
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* This function is intended for kernel subsystems that cache slab allocations
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* to reuse them instead of freeing them back to the slab allocator (e.g.
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* mempool).
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*
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* This function unpoisons a slab allocation that was previously poisoned via
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* kasan_mempool_poison_object() and saves an alloc stack trace for it without
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* initializing the allocation's memory. For the tag-based modes, this function
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* does not assign a new tag to the allocation and instead restores the
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* original tags based on the pointer value.
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*
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* This function operates on all slab allocations including large kmalloc
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* allocations (the ones returned by kmalloc_large() or by kmalloc() with the
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* size > KMALLOC_MAX_SIZE).
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*/
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static __always_inline void kasan_mempool_unpoison_object(void *ptr,
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size_t size)
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{
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if (kasan_enabled())
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__kasan_mempool_unpoison_object(ptr, size, _RET_IP_);
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}
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/*
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* Unlike kasan_check_read/write(), kasan_check_byte() is performed even for
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* the hardware tag-based mode that doesn't rely on compiler instrumentation.
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*/
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bool __kasan_check_byte(const void *addr, unsigned long ip);
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static __always_inline bool kasan_check_byte(const void *addr)
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{
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if (kasan_enabled())
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return __kasan_check_byte(addr, _RET_IP_);
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return true;
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}
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#else /* CONFIG_KASAN */
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static inline void kasan_unpoison_range(const void *address, size_t size) {}
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static inline void kasan_poison_pages(struct page *page, unsigned int order,
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bool init) {}
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static inline bool kasan_unpoison_pages(struct page *page, unsigned int order,
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bool init)
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{
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return false;
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}
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static inline void kasan_poison_slab(struct slab *slab) {}
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static inline void kasan_unpoison_new_object(struct kmem_cache *cache,
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void *object) {}
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static inline void kasan_poison_new_object(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 bool kasan_slab_free(struct kmem_cache *s, void *object, bool init)
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{
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return false;
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}
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static inline void kasan_kfree_large(void *ptr) {}
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static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object,
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gfp_t flags, bool init)
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{
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return object;
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}
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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_kmalloc_large(const void *ptr, size_t size, gfp_t flags)
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{
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return (void *)ptr;
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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 bool kasan_mempool_poison_pages(struct page *page, unsigned int order)
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{
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return true;
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}
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static inline void kasan_mempool_unpoison_pages(struct page *page, unsigned int order) {}
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static inline bool kasan_mempool_poison_object(void *ptr)
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{
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return true;
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}
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static inline void kasan_mempool_unpoison_object(void *ptr, size_t size) {}
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static inline bool kasan_check_byte(const void *address)
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{
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return true;
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}
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#endif /* CONFIG_KASAN */
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#if defined(CONFIG_KASAN) && defined(CONFIG_KASAN_STACK)
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void kasan_unpoison_task_stack(struct task_struct *task);
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asmlinkage void kasan_unpoison_task_stack_below(const void *watermark);
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#else
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static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
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static inline void kasan_unpoison_task_stack_below(const void *watermark) {}
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#endif
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#ifdef CONFIG_KASAN_GENERIC
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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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size_t kasan_metadata_size(struct kmem_cache *cache, bool in_object);
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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_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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void kasan_record_aux_stack_noalloc(void *ptr);
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#else /* CONFIG_KASAN_GENERIC */
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/* Tag-based KASAN modes do not use per-object metadata. */
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static inline size_t kasan_metadata_size(struct kmem_cache *cache,
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bool in_object)
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{
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return 0;
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}
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/* And no cache-related metadata initialization is required. */
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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_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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static inline void kasan_record_aux_stack_noalloc(void *ptr) {}
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#endif /* CONFIG_KASAN_GENERIC */
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#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
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static inline void *kasan_reset_tag(const void *addr)
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{
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return (void *)arch_kasan_reset_tag(addr);
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}
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/**
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* kasan_report - print a report about a bad memory access detected by KASAN
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* @addr: address of the bad access
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* @size: size of the bad access
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* @is_write: whether the bad access is a write or a read
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* @ip: instruction pointer for the accessibility check or the bad access itself
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*/
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bool kasan_report(const void *addr, size_t size,
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bool is_write, unsigned long ip);
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|
|
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#else /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */
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|
|
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static inline void *kasan_reset_tag(const void *addr)
|
|
{
|
|
return (void *)addr;
|
|
}
|
|
|
|
#endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS*/
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|
|
|
#ifdef CONFIG_KASAN_HW_TAGS
|
|
|
|
void kasan_report_async(void);
|
|
|
|
#endif /* CONFIG_KASAN_HW_TAGS */
|
|
|
|
#ifdef CONFIG_KASAN_SW_TAGS
|
|
void __init kasan_init_sw_tags(void);
|
|
#else
|
|
static inline void kasan_init_sw_tags(void) { }
|
|
#endif
|
|
|
|
#ifdef CONFIG_KASAN_HW_TAGS
|
|
void kasan_init_hw_tags_cpu(void);
|
|
void __init kasan_init_hw_tags(void);
|
|
#else
|
|
static inline void kasan_init_hw_tags_cpu(void) { }
|
|
static inline void kasan_init_hw_tags(void) { }
|
|
#endif
|
|
|
|
#ifdef CONFIG_KASAN_VMALLOC
|
|
|
|
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
|
|
|
|
void kasan_populate_early_vm_area_shadow(void *start, unsigned long size);
|
|
int kasan_populate_vmalloc(unsigned long addr, unsigned long size);
|
|
void kasan_release_vmalloc(unsigned long start, unsigned long end,
|
|
unsigned long free_region_start,
|
|
unsigned long free_region_end);
|
|
|
|
#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
|
|
|
|
static inline void kasan_populate_early_vm_area_shadow(void *start,
|
|
unsigned long size)
|
|
{ }
|
|
static inline int kasan_populate_vmalloc(unsigned long start,
|
|
unsigned long size)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void kasan_release_vmalloc(unsigned long start,
|
|
unsigned long end,
|
|
unsigned long free_region_start,
|
|
unsigned long free_region_end) { }
|
|
|
|
#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
|
|
|
|
void *__kasan_unpoison_vmalloc(const void *start, unsigned long size,
|
|
kasan_vmalloc_flags_t flags);
|
|
static __always_inline void *kasan_unpoison_vmalloc(const void *start,
|
|
unsigned long size,
|
|
kasan_vmalloc_flags_t flags)
|
|
{
|
|
if (kasan_enabled())
|
|
return __kasan_unpoison_vmalloc(start, size, flags);
|
|
return (void *)start;
|
|
}
|
|
|
|
void __kasan_poison_vmalloc(const void *start, unsigned long size);
|
|
static __always_inline void kasan_poison_vmalloc(const void *start,
|
|
unsigned long size)
|
|
{
|
|
if (kasan_enabled())
|
|
__kasan_poison_vmalloc(start, size);
|
|
}
|
|
|
|
#else /* CONFIG_KASAN_VMALLOC */
|
|
|
|
static inline void kasan_populate_early_vm_area_shadow(void *start,
|
|
unsigned long size) { }
|
|
static inline int kasan_populate_vmalloc(unsigned long start,
|
|
unsigned long size)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void kasan_release_vmalloc(unsigned long start,
|
|
unsigned long end,
|
|
unsigned long free_region_start,
|
|
unsigned long free_region_end) { }
|
|
|
|
static inline void *kasan_unpoison_vmalloc(const void *start,
|
|
unsigned long size,
|
|
kasan_vmalloc_flags_t flags)
|
|
{
|
|
return (void *)start;
|
|
}
|
|
static inline void kasan_poison_vmalloc(const void *start, unsigned long size)
|
|
{ }
|
|
|
|
#endif /* CONFIG_KASAN_VMALLOC */
|
|
|
|
#if (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) && \
|
|
!defined(CONFIG_KASAN_VMALLOC)
|
|
|
|
/*
|
|
* These functions allocate and free shadow memory for kernel modules.
|
|
* They are only required when KASAN_VMALLOC is not supported, as otherwise
|
|
* shadow memory is allocated by the generic vmalloc handlers.
|
|
*/
|
|
int kasan_alloc_module_shadow(void *addr, size_t size, gfp_t gfp_mask);
|
|
void kasan_free_module_shadow(const struct vm_struct *vm);
|
|
|
|
#else /* (CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) && !CONFIG_KASAN_VMALLOC */
|
|
|
|
static inline int kasan_alloc_module_shadow(void *addr, size_t size, gfp_t gfp_mask) { return 0; }
|
|
static inline void kasan_free_module_shadow(const struct vm_struct *vm) {}
|
|
|
|
#endif /* (CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) && !CONFIG_KASAN_VMALLOC */
|
|
|
|
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
|
|
void kasan_non_canonical_hook(unsigned long addr);
|
|
#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
|
|
static inline void kasan_non_canonical_hook(unsigned long addr) { }
|
|
#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
|
|
|
|
#endif /* LINUX_KASAN_H */
|