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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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b42090ae6f
Currently, the code responsible for initializing and poisoning memory in post_alloc_hook() is scattered across two locations: kasan_alloc_pages() hook for HW_TAGS KASAN and post_alloc_hook() itself. This is confusing. This and a few following patches combine the code from these two locations. Along the way, these patches do a step-by-step restructure the many performed checks to make them easier to follow. Replace the only caller of kasan_alloc_pages() with its implementation. As kasan_has_integrated_init() is only true when CONFIG_KASAN_HW_TAGS is enabled, moving the code does no functional changes. Also move init and init_tags variables definitions out of kasan_has_integrated_init() clause in post_alloc_hook(), as they have the same values regardless of what the if condition evaluates to. This patch is not useful by itself but makes the simplifications in the following patches easier to follow. Link: https://lkml.kernel.org/r/5ac7e0b30f5cbb177ec363ddd7878a3141289592.1643047180.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Acked-by: Marco Elver <elver@google.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Evgenii Stepanov <eugenis@google.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Peter Collingbourne <pcc@google.com> Cc: Vincenzo Frascino <vincenzo.frascino@arm.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
456 lines
13 KiB
C
456 lines
13 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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/* 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_found;
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};
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#endif
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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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struct kasan_cache {
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int alloc_meta_offset;
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int free_meta_offset;
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bool is_kmalloc;
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};
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slab_flags_t __kasan_never_merge(void);
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static __always_inline slab_flags_t kasan_never_merge(void)
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{
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if (kasan_enabled())
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return __kasan_never_merge();
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return 0;
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}
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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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void __kasan_unpoison_pages(struct page *page, unsigned int order, bool init);
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static __always_inline void 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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__kasan_unpoison_pages(page, order, init);
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}
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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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static __always_inline void kasan_cache_create(struct kmem_cache *cache,
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unsigned int *size, slab_flags_t *flags)
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{
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if (kasan_enabled())
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__kasan_cache_create(cache, size, flags);
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}
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void __kasan_cache_create_kmalloc(struct kmem_cache *cache);
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static __always_inline void kasan_cache_create_kmalloc(struct kmem_cache *cache)
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{
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if (kasan_enabled())
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__kasan_cache_create_kmalloc(cache);
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}
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size_t __kasan_metadata_size(struct kmem_cache *cache);
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static __always_inline size_t kasan_metadata_size(struct kmem_cache *cache)
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{
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if (kasan_enabled())
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return __kasan_metadata_size(cache);
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return 0;
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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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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 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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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 void kasan_unpoison_pages(struct page *page, unsigned int order,
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bool init) {}
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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_create_kmalloc(struct kmem_cache *cache) {}
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static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
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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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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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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(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 || 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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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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void kasan_populate_early_vm_area_shadow(void *start, unsigned long size);
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#else /* CONFIG_KASAN_VMALLOC */
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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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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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#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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* 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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int kasan_module_alloc(void *addr, size_t size, gfp_t gfp_mask);
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void kasan_free_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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static inline int kasan_module_alloc(void *addr, size_t size, gfp_t gfp_mask) { return 0; }
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static inline void kasan_free_shadow(const struct vm_struct *vm) {}
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#endif /* (CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) && !CONFIG_KASAN_VMALLOC */
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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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