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bb6e04a173
gcc-13 warns about function definitions for builtin interfaces that have a different prototype, e.g.: In file included from kasan_test.c:31: kasan.h:574:6: error: conflicting types for built-in function '__asan_register_globals'; expected 'void(void *, long int)' [-Werror=builtin-declaration-mismatch] 574 | void __asan_register_globals(struct kasan_global *globals, size_t size); kasan.h:577:6: error: conflicting types for built-in function '__asan_alloca_poison'; expected 'void(void *, long int)' [-Werror=builtin-declaration-mismatch] 577 | void __asan_alloca_poison(unsigned long addr, size_t size); kasan.h:580:6: error: conflicting types for built-in function '__asan_load1'; expected 'void(void *)' [-Werror=builtin-declaration-mismatch] 580 | void __asan_load1(unsigned long addr); kasan.h:581:6: error: conflicting types for built-in function '__asan_store1'; expected 'void(void *)' [-Werror=builtin-declaration-mismatch] 581 | void __asan_store1(unsigned long addr); kasan.h:643:6: error: conflicting types for built-in function '__hwasan_tag_memory'; expected 'void(void *, unsigned char, long int)' [-Werror=builtin-declaration-mismatch] 643 | void __hwasan_tag_memory(unsigned long addr, u8 tag, unsigned long size); The two problems are: - Addresses are passes as 'unsigned long' in the kernel, but gcc-13 expects a 'void *'. - sizes meant to use a signed ssize_t rather than size_t. Change all the prototypes to match these. Using 'void *' consistently for addresses gets rid of a couple of type casts, so push that down to the leaf functions where possible. This now passes all randconfig builds on arm, arm64 and x86, but I have not tested it on the other architectures that support kasan, since they tend to fail randconfig builds in other ways. This might fail if any of the 32-bit architectures expect a 'long' instead of 'int' for the size argument. The __asan_allocas_unpoison() function prototype is somewhat weird, since it uses a pointer for 'stack_top' and an size_t for 'stack_bottom'. This looks like it is meant to be 'addr' and 'size' like the others, but the implementation clearly treats them as 'top' and 'bottom'. Link: https://lkml.kernel.org/r/20230509145735.9263-2-arnd@kernel.org Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Konovalov <andreyknvl@gmail.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Marco Elver <elver@google.com> Cc: Vincenzo Frascino <vincenzo.frascino@arm.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
473 lines
14 KiB
C
473 lines
14 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/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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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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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_object_data(struct kmem_cache *cache, void *object);
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static __always_inline void kasan_unpoison_object_data(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_object_data(cache, object);
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}
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void __kasan_poison_object_data(struct kmem_cache *cache, void *object);
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static __always_inline void kasan_poison_object_data(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_object_data(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 __kasan_slab_free_mempool(void *ptr, unsigned long ip);
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static __always_inline void kasan_slab_free_mempool(void *ptr)
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{
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if (kasan_enabled())
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__kasan_slab_free_mempool(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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/*
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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_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 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_free_mempool(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_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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#else
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static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
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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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slab_flags_t kasan_never_merge(void);
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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 thus nothing prevents cache merging. */
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static inline slab_flags_t kasan_never_merge(void)
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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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#else /* CONFIG_KASAN_SW_TAGS || 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 *)addr;
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}
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#endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS*/
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#ifdef CONFIG_KASAN_HW_TAGS
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void kasan_report_async(void);
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#endif /* CONFIG_KASAN_HW_TAGS */
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#ifdef CONFIG_KASAN_SW_TAGS
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void __init kasan_init_sw_tags(void);
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#else
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static inline void kasan_init_sw_tags(void) { }
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#endif
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#ifdef CONFIG_KASAN_HW_TAGS
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void kasan_init_hw_tags_cpu(void);
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void __init kasan_init_hw_tags(void);
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#else
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static inline void kasan_init_hw_tags_cpu(void) { }
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static inline void kasan_init_hw_tags(void) { }
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#endif
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#ifdef CONFIG_KASAN_VMALLOC
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#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
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void kasan_populate_early_vm_area_shadow(void *start, unsigned long size);
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int kasan_populate_vmalloc(unsigned long addr, 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 /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
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static inline void kasan_populate_early_vm_area_shadow(void *start,
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unsigned long size)
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{ }
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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_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 /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
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void *__kasan_unpoison_vmalloc(const void *start, unsigned long size,
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kasan_vmalloc_flags_t flags);
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static __always_inline void *kasan_unpoison_vmalloc(const void *start,
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unsigned long size,
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kasan_vmalloc_flags_t flags)
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{
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if (kasan_enabled())
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return __kasan_unpoison_vmalloc(start, size, flags);
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return (void *)start;
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}
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void __kasan_poison_vmalloc(const void *start, unsigned long size);
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static __always_inline void kasan_poison_vmalloc(const void *start,
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unsigned long size)
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{
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if (kasan_enabled())
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__kasan_poison_vmalloc(start, size);
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}
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#else /* CONFIG_KASAN_VMALLOC */
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static inline void kasan_populate_early_vm_area_shadow(void *start,
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unsigned long size) { }
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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_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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static inline void *kasan_unpoison_vmalloc(const void *start,
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unsigned long size,
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kasan_vmalloc_flags_t flags)
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{
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return (void *)start;
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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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#endif /* CONFIG_KASAN_VMALLOC */
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#if (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) && \
|
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!defined(CONFIG_KASAN_VMALLOC)
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|
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/*
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* These functions allocate and free shadow memory for kernel modules.
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* They are only required when KASAN_VMALLOC is not supported, as otherwise
|
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* shadow memory is allocated by the generic vmalloc handlers.
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|
*/
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int kasan_alloc_module_shadow(void *addr, size_t size, gfp_t gfp_mask);
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void kasan_free_module_shadow(const struct vm_struct *vm);
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#else /* (CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) && !CONFIG_KASAN_VMALLOC */
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|
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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) {}
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|
|
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#endif /* (CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) && !CONFIG_KASAN_VMALLOC */
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|
|
|
#ifdef CONFIG_KASAN_INLINE
|
|
void kasan_non_canonical_hook(unsigned long addr);
|
|
#else /* CONFIG_KASAN_INLINE */
|
|
static inline void kasan_non_canonical_hook(unsigned long addr) { }
|
|
#endif /* CONFIG_KASAN_INLINE */
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|
|
|
#endif /* LINUX_KASAN_H */
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