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https://mirrors.bfsu.edu.cn/git/linux.git
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Merge branch 'slab/for-6.11/buckets' into slab/for-next
Merge all the slab patches previously collected on top of v6.10-rc1, over cleanups/fixes that had to be based on rc6.
This commit is contained in:
Vlastimil Babka
commit
436381eaf2
@ -145,7 +145,9 @@ smaller than page size.
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The address of a chunk allocated with `kmalloc` is aligned to at least
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ARCH_KMALLOC_MINALIGN bytes. For sizes which are a power of two, the
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alignment is also guaranteed to be at least the respective size.
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alignment is also guaranteed to be at least the respective size. For other
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sizes, the alignment is guaranteed to be at least the largest power-of-two
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divisor of the size.
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Chunks allocated with kmalloc() can be resized with krealloc(). Similarly
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to kmalloc_array(): a helper for resizing arrays is provided in the form of
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@ -1110,7 +1110,7 @@ static inline unsigned int compound_order(struct page *page)
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*
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* Return: The order of the folio.
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*/
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static inline unsigned int folio_order(struct folio *folio)
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static inline unsigned int folio_order(const struct folio *folio)
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{
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if (!folio_test_large(folio))
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return 0;
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@ -2150,7 +2150,7 @@ static inline struct folio *folio_next(struct folio *folio)
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* it from being split. It is not necessary for the folio to be locked.
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* Return: The base-2 logarithm of the size of this folio.
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*/
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static inline unsigned int folio_shift(struct folio *folio)
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static inline unsigned int folio_shift(const struct folio *folio)
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{
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return PAGE_SHIFT + folio_order(folio);
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}
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@ -2163,7 +2163,7 @@ static inline unsigned int folio_shift(struct folio *folio)
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* it from being split. It is not necessary for the folio to be locked.
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* Return: The number of bytes in this folio.
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*/
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static inline size_t folio_size(struct folio *folio)
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static inline size_t folio_size(const struct folio *folio)
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{
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return PAGE_SIZE << folio_order(folio);
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}
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@ -38,11 +38,8 @@
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* Magic nums for obj red zoning.
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* Placed in the first word before and the first word after an obj.
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*/
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#define RED_INACTIVE 0x09F911029D74E35BULL /* when obj is inactive */
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#define RED_ACTIVE 0xD84156C5635688C0ULL /* when obj is active */
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#define SLUB_RED_INACTIVE 0xbb
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#define SLUB_RED_ACTIVE 0xcc
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#define SLUB_RED_INACTIVE 0xbb /* when obj is inactive */
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#define SLUB_RED_ACTIVE 0xcc /* when obj is active */
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/* ...and for poisoning */
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#define POISON_INUSE 0x5a /* for use-uninitialised poisoning */
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@ -426,8 +426,9 @@ enum kmalloc_cache_type {
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NR_KMALLOC_TYPES
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};
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extern struct kmem_cache *
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kmalloc_caches[NR_KMALLOC_TYPES][KMALLOC_SHIFT_HIGH + 1];
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typedef struct kmem_cache * kmem_buckets[KMALLOC_SHIFT_HIGH + 1];
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extern kmem_buckets kmalloc_caches[NR_KMALLOC_TYPES];
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/*
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* Define gfp bits that should not be set for KMALLOC_NORMAL.
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@ -528,9 +529,6 @@ static_assert(PAGE_SHIFT <= 20);
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#include <linux/alloc_tag.h>
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void *__kmalloc_noprof(size_t size, gfp_t flags) __assume_kmalloc_alignment __alloc_size(1);
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#define __kmalloc(...) alloc_hooks(__kmalloc_noprof(__VA_ARGS__))
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/**
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* kmem_cache_alloc - Allocate an object
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* @cachep: The cache to allocate from.
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@ -551,6 +549,10 @@ void *kmem_cache_alloc_lru_noprof(struct kmem_cache *s, struct list_lru *lru,
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void kmem_cache_free(struct kmem_cache *s, void *objp);
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kmem_buckets *kmem_buckets_create(const char *name, slab_flags_t flags,
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unsigned int useroffset, unsigned int usersize,
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void (*ctor)(void *));
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/*
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* Bulk allocation and freeing operations. These are accelerated in an
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* allocator specific way to avoid taking locks repeatedly or building
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@ -568,31 +570,49 @@ static __always_inline void kfree_bulk(size_t size, void **p)
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kmem_cache_free_bulk(NULL, size, p);
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}
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void *__kmalloc_node_noprof(size_t size, gfp_t flags, int node) __assume_kmalloc_alignment
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__alloc_size(1);
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#define __kmalloc_node(...) alloc_hooks(__kmalloc_node_noprof(__VA_ARGS__))
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void *kmem_cache_alloc_node_noprof(struct kmem_cache *s, gfp_t flags,
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int node) __assume_slab_alignment __malloc;
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#define kmem_cache_alloc_node(...) alloc_hooks(kmem_cache_alloc_node_noprof(__VA_ARGS__))
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void *kmalloc_trace_noprof(struct kmem_cache *s, gfp_t flags, size_t size)
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/*
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* These macros allow declaring a kmem_buckets * parameter alongside size, which
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* can be compiled out with CONFIG_SLAB_BUCKETS=n so that a large number of call
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* sites don't have to pass NULL.
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*/
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#ifdef CONFIG_SLAB_BUCKETS
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#define DECL_BUCKET_PARAMS(_size, _b) size_t (_size), kmem_buckets *(_b)
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#define PASS_BUCKET_PARAMS(_size, _b) (_size), (_b)
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#define PASS_BUCKET_PARAM(_b) (_b)
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#else
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#define DECL_BUCKET_PARAMS(_size, _b) size_t (_size)
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#define PASS_BUCKET_PARAMS(_size, _b) (_size)
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#define PASS_BUCKET_PARAM(_b) NULL
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#endif
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/*
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* The following functions are not to be used directly and are intended only
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* for internal use from kmalloc() and kmalloc_node()
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* with the exception of kunit tests
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*/
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void *__kmalloc_noprof(size_t size, gfp_t flags)
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__assume_kmalloc_alignment __alloc_size(1);
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void *__kmalloc_node_noprof(DECL_BUCKET_PARAMS(size, b), gfp_t flags, int node)
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__assume_kmalloc_alignment __alloc_size(1);
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void *__kmalloc_cache_noprof(struct kmem_cache *s, gfp_t flags, size_t size)
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__assume_kmalloc_alignment __alloc_size(3);
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void *kmalloc_node_trace_noprof(struct kmem_cache *s, gfp_t gfpflags,
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int node, size_t size) __assume_kmalloc_alignment
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__alloc_size(4);
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#define kmalloc_trace(...) alloc_hooks(kmalloc_trace_noprof(__VA_ARGS__))
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void *__kmalloc_cache_node_noprof(struct kmem_cache *s, gfp_t gfpflags,
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int node, size_t size)
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__assume_kmalloc_alignment __alloc_size(4);
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#define kmalloc_node_trace(...) alloc_hooks(kmalloc_node_trace_noprof(__VA_ARGS__))
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void *__kmalloc_large_noprof(size_t size, gfp_t flags)
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__assume_page_alignment __alloc_size(1);
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void *kmalloc_large_noprof(size_t size, gfp_t flags) __assume_page_alignment
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__alloc_size(1);
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#define kmalloc_large(...) alloc_hooks(kmalloc_large_noprof(__VA_ARGS__))
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void *kmalloc_large_node_noprof(size_t size, gfp_t flags, int node) __assume_page_alignment
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__alloc_size(1);
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#define kmalloc_large_node(...) alloc_hooks(kmalloc_large_node_noprof(__VA_ARGS__))
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void *__kmalloc_large_node_noprof(size_t size, gfp_t flags, int node)
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__assume_page_alignment __alloc_size(1);
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/**
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* kmalloc - allocate kernel memory
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@ -604,7 +624,8 @@ void *kmalloc_large_node_noprof(size_t size, gfp_t flags, int node) __assume_pag
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*
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* The allocated object address is aligned to at least ARCH_KMALLOC_MINALIGN
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* bytes. For @size of power of two bytes, the alignment is also guaranteed
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* to be at least to the size.
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* to be at least to the size. For other sizes, the alignment is guaranteed to
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* be at least the largest power-of-two divisor of @size.
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*
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* The @flags argument may be one of the GFP flags defined at
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* include/linux/gfp_types.h and described at
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@ -654,10 +675,10 @@ static __always_inline __alloc_size(1) void *kmalloc_noprof(size_t size, gfp_t f
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unsigned int index;
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if (size > KMALLOC_MAX_CACHE_SIZE)
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return kmalloc_large_noprof(size, flags);
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return __kmalloc_large_noprof(size, flags);
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index = kmalloc_index(size);
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return kmalloc_trace_noprof(
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return __kmalloc_cache_noprof(
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kmalloc_caches[kmalloc_type(flags, _RET_IP_)][index],
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flags, size);
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}
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@ -665,20 +686,26 @@ static __always_inline __alloc_size(1) void *kmalloc_noprof(size_t size, gfp_t f
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}
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#define kmalloc(...) alloc_hooks(kmalloc_noprof(__VA_ARGS__))
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#define kmem_buckets_alloc(_b, _size, _flags) \
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alloc_hooks(__kmalloc_node_noprof(PASS_BUCKET_PARAMS(_size, _b), _flags, NUMA_NO_NODE))
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#define kmem_buckets_alloc_track_caller(_b, _size, _flags) \
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alloc_hooks(__kmalloc_node_track_caller_noprof(PASS_BUCKET_PARAMS(_size, _b), _flags, NUMA_NO_NODE, _RET_IP_))
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static __always_inline __alloc_size(1) void *kmalloc_node_noprof(size_t size, gfp_t flags, int node)
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{
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if (__builtin_constant_p(size) && size) {
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unsigned int index;
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if (size > KMALLOC_MAX_CACHE_SIZE)
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return kmalloc_large_node_noprof(size, flags, node);
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return __kmalloc_large_node_noprof(size, flags, node);
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index = kmalloc_index(size);
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return kmalloc_node_trace_noprof(
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return __kmalloc_cache_node_noprof(
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kmalloc_caches[kmalloc_type(flags, _RET_IP_)][index],
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flags, node, size);
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}
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return __kmalloc_node_noprof(size, flags, node);
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return __kmalloc_node_noprof(PASS_BUCKET_PARAMS(size, NULL), flags, node);
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}
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#define kmalloc_node(...) alloc_hooks(kmalloc_node_noprof(__VA_ARGS__))
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@ -729,8 +756,10 @@ static inline __realloc_size(2, 3) void * __must_check krealloc_array_noprof(voi
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*/
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#define kcalloc(n, size, flags) kmalloc_array(n, size, (flags) | __GFP_ZERO)
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void *kmalloc_node_track_caller_noprof(size_t size, gfp_t flags, int node,
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void *__kmalloc_node_track_caller_noprof(DECL_BUCKET_PARAMS(size, b), gfp_t flags, int node,
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unsigned long caller) __alloc_size(1);
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#define kmalloc_node_track_caller_noprof(size, flags, node, caller) \
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__kmalloc_node_track_caller_noprof(PASS_BUCKET_PARAMS(size, NULL), flags, node, caller)
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#define kmalloc_node_track_caller(...) \
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alloc_hooks(kmalloc_node_track_caller_noprof(__VA_ARGS__, _RET_IP_))
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@ -756,7 +785,7 @@ static inline __alloc_size(1, 2) void *kmalloc_array_node_noprof(size_t n, size_
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return NULL;
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if (__builtin_constant_p(n) && __builtin_constant_p(size))
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return kmalloc_node_noprof(bytes, flags, node);
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return __kmalloc_node_noprof(bytes, flags, node);
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return __kmalloc_node_noprof(PASS_BUCKET_PARAMS(bytes, NULL), flags, node);
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}
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#define kmalloc_array_node(...) alloc_hooks(kmalloc_array_node_noprof(__VA_ARGS__))
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@ -780,7 +809,9 @@ static inline __alloc_size(1) void *kzalloc_noprof(size_t size, gfp_t flags)
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#define kzalloc(...) alloc_hooks(kzalloc_noprof(__VA_ARGS__))
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#define kzalloc_node(_size, _flags, _node) kmalloc_node(_size, (_flags)|__GFP_ZERO, _node)
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extern void *kvmalloc_node_noprof(size_t size, gfp_t flags, int node) __alloc_size(1);
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void *__kvmalloc_node_noprof(DECL_BUCKET_PARAMS(size, b), gfp_t flags, int node) __alloc_size(1);
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#define kvmalloc_node_noprof(size, flags, node) \
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__kvmalloc_node_noprof(PASS_BUCKET_PARAMS(size, NULL), flags, node)
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#define kvmalloc_node(...) alloc_hooks(kvmalloc_node_noprof(__VA_ARGS__))
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#define kvmalloc(_size, _flags) kvmalloc_node(_size, _flags, NUMA_NO_NODE)
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@ -788,6 +819,8 @@ extern void *kvmalloc_node_noprof(size_t size, gfp_t flags, int node) __alloc_si
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#define kvzalloc(_size, _flags) kvmalloc(_size, (_flags)|__GFP_ZERO)
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#define kvzalloc_node(_size, _flags, _node) kvmalloc_node(_size, (_flags)|__GFP_ZERO, _node)
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#define kmem_buckets_valloc(_b, _size, _flags) \
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alloc_hooks(__kvmalloc_node_noprof(PASS_BUCKET_PARAMS(_size, _b), _flags, NUMA_NO_NODE))
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static inline __alloc_size(1, 2) void *
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kvmalloc_array_node_noprof(size_t n, size_t size, gfp_t flags, int node)
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@ -42,6 +42,17 @@ struct msg_msgseg {
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#define DATALEN_MSG ((size_t)PAGE_SIZE-sizeof(struct msg_msg))
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#define DATALEN_SEG ((size_t)PAGE_SIZE-sizeof(struct msg_msgseg))
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|
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static kmem_buckets *msg_buckets __ro_after_init;
|
||||
|
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static int __init init_msg_buckets(void)
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{
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msg_buckets = kmem_buckets_create("msg_msg", SLAB_ACCOUNT,
|
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sizeof(struct msg_msg),
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DATALEN_MSG, NULL);
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|
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return 0;
|
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}
|
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subsys_initcall(init_msg_buckets);
|
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|
||||
static struct msg_msg *alloc_msg(size_t len)
|
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{
|
||||
@ -50,7 +61,7 @@ static struct msg_msg *alloc_msg(size_t len)
|
||||
size_t alen;
|
||||
|
||||
alen = min(len, DATALEN_MSG);
|
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msg = kmalloc(sizeof(*msg) + alen, GFP_KERNEL_ACCOUNT);
|
||||
msg = kmem_buckets_alloc(msg_buckets, sizeof(*msg) + alen, GFP_KERNEL);
|
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if (msg == NULL)
|
||||
return NULL;
|
||||
|
||||
|
||||
@ -20,6 +20,7 @@ CONFIG_RANDOMIZE_MEMORY=y
|
||||
# Randomize allocator freelists, harden metadata.
|
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CONFIG_SLAB_FREELIST_RANDOM=y
|
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CONFIG_SLAB_FREELIST_HARDENED=y
|
||||
CONFIG_SLAB_BUCKETS=y
|
||||
CONFIG_SHUFFLE_PAGE_ALLOCATOR=y
|
||||
CONFIG_RANDOM_KMALLOC_CACHES=y
|
||||
|
||||
|
||||
@ -233,8 +233,6 @@ static void fortify_test_alloc_size_##allocator##_dynamic(struct kunit *test) \
|
||||
kfree(p)); \
|
||||
checker(expected_size, \
|
||||
kmalloc_array_node(alloc_size, 1, gfp, NUMA_NO_NODE), \
|
||||
kfree(p)); \
|
||||
checker(expected_size, __kmalloc(alloc_size, gfp), \
|
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kfree(p)); \
|
||||
\
|
||||
orig = kmalloc(alloc_size, gfp); \
|
||||
|
||||
@ -140,7 +140,7 @@ static void test_kmalloc_redzone_access(struct kunit *test)
|
||||
{
|
||||
struct kmem_cache *s = test_kmem_cache_create("TestSlub_RZ_kmalloc", 32,
|
||||
SLAB_KMALLOC|SLAB_STORE_USER|SLAB_RED_ZONE);
|
||||
u8 *p = kmalloc_trace(s, GFP_KERNEL, 18);
|
||||
u8 *p = __kmalloc_cache_noprof(s, GFP_KERNEL, 18);
|
||||
|
||||
kasan_disable_current();
|
||||
|
||||
|
||||
17
mm/Kconfig
17
mm/Kconfig
@ -273,6 +273,23 @@ config SLAB_FREELIST_HARDENED
|
||||
sacrifices to harden the kernel slab allocator against common
|
||||
freelist exploit methods.
|
||||
|
||||
config SLAB_BUCKETS
|
||||
bool "Support allocation from separate kmalloc buckets"
|
||||
depends on !SLUB_TINY
|
||||
default SLAB_FREELIST_HARDENED
|
||||
help
|
||||
Kernel heap attacks frequently depend on being able to create
|
||||
specifically-sized allocations with user-controlled contents
|
||||
that will be allocated into the same kmalloc bucket as a
|
||||
target object. To avoid sharing these allocation buckets,
|
||||
provide an explicitly separated set of buckets to be used for
|
||||
user-controlled allocations. This may very slightly increase
|
||||
memory fragmentation, though in practice it's only a handful
|
||||
of extra pages since the bulk of user-controlled allocations
|
||||
are relatively long-lived.
|
||||
|
||||
If unsure, say Y.
|
||||
|
||||
config SLUB_STATS
|
||||
default n
|
||||
bool "Enable performance statistics"
|
||||
|
||||
10
mm/slab.h
10
mm/slab.h
@ -168,7 +168,7 @@ static_assert(IS_ALIGNED(offsetof(struct slab, freelist), sizeof(freelist_aba_t)
|
||||
*/
|
||||
static inline bool slab_test_pfmemalloc(const struct slab *slab)
|
||||
{
|
||||
return folio_test_active((struct folio *)slab_folio(slab));
|
||||
return folio_test_active(slab_folio(slab));
|
||||
}
|
||||
|
||||
static inline void slab_set_pfmemalloc(struct slab *slab)
|
||||
@ -213,7 +213,7 @@ static inline struct slab *virt_to_slab(const void *addr)
|
||||
|
||||
static inline int slab_order(const struct slab *slab)
|
||||
{
|
||||
return folio_order((struct folio *)slab_folio(slab));
|
||||
return folio_order(slab_folio(slab));
|
||||
}
|
||||
|
||||
static inline size_t slab_size(const struct slab *slab)
|
||||
@ -405,16 +405,18 @@ static inline unsigned int size_index_elem(unsigned int bytes)
|
||||
* KMALLOC_MAX_CACHE_SIZE and the caller must check that.
|
||||
*/
|
||||
static inline struct kmem_cache *
|
||||
kmalloc_slab(size_t size, gfp_t flags, unsigned long caller)
|
||||
kmalloc_slab(size_t size, kmem_buckets *b, gfp_t flags, unsigned long caller)
|
||||
{
|
||||
unsigned int index;
|
||||
|
||||
if (!b)
|
||||
b = &kmalloc_caches[kmalloc_type(flags, caller)];
|
||||
if (size <= 192)
|
||||
index = kmalloc_size_index[size_index_elem(size)];
|
||||
else
|
||||
index = fls(size - 1);
|
||||
|
||||
return kmalloc_caches[kmalloc_type(flags, caller)][index];
|
||||
return (*b)[index];
|
||||
}
|
||||
|
||||
gfp_t kmalloc_fix_flags(gfp_t flags);
|
||||
|
||||
111
mm/slab_common.c
111
mm/slab_common.c
@ -392,6 +392,98 @@ kmem_cache_create(const char *name, unsigned int size, unsigned int align,
|
||||
}
|
||||
EXPORT_SYMBOL(kmem_cache_create);
|
||||
|
||||
static struct kmem_cache *kmem_buckets_cache __ro_after_init;
|
||||
|
||||
/**
|
||||
* kmem_buckets_create - Create a set of caches that handle dynamic sized
|
||||
* allocations via kmem_buckets_alloc()
|
||||
* @name: A prefix string which is used in /proc/slabinfo to identify this
|
||||
* cache. The individual caches with have their sizes as the suffix.
|
||||
* @flags: SLAB flags (see kmem_cache_create() for details).
|
||||
* @useroffset: Starting offset within an allocation that may be copied
|
||||
* to/from userspace.
|
||||
* @usersize: How many bytes, starting at @useroffset, may be copied
|
||||
* to/from userspace.
|
||||
* @ctor: A constructor for the objects, run when new allocations are made.
|
||||
*
|
||||
* Cannot be called within an interrupt, but can be interrupted.
|
||||
*
|
||||
* Return: a pointer to the cache on success, NULL on failure. When
|
||||
* CONFIG_SLAB_BUCKETS is not enabled, ZERO_SIZE_PTR is returned, and
|
||||
* subsequent calls to kmem_buckets_alloc() will fall back to kmalloc().
|
||||
* (i.e. callers only need to check for NULL on failure.)
|
||||
*/
|
||||
kmem_buckets *kmem_buckets_create(const char *name, slab_flags_t flags,
|
||||
unsigned int useroffset,
|
||||
unsigned int usersize,
|
||||
void (*ctor)(void *))
|
||||
{
|
||||
kmem_buckets *b;
|
||||
int idx;
|
||||
|
||||
/*
|
||||
* When the separate buckets API is not built in, just return
|
||||
* a non-NULL value for the kmem_buckets pointer, which will be
|
||||
* unused when performing allocations.
|
||||
*/
|
||||
if (!IS_ENABLED(CONFIG_SLAB_BUCKETS))
|
||||
return ZERO_SIZE_PTR;
|
||||
|
||||
if (WARN_ON(!kmem_buckets_cache))
|
||||
return NULL;
|
||||
|
||||
b = kmem_cache_alloc(kmem_buckets_cache, GFP_KERNEL|__GFP_ZERO);
|
||||
if (WARN_ON(!b))
|
||||
return NULL;
|
||||
|
||||
flags |= SLAB_NO_MERGE;
|
||||
|
||||
for (idx = 0; idx < ARRAY_SIZE(kmalloc_caches[KMALLOC_NORMAL]); idx++) {
|
||||
char *short_size, *cache_name;
|
||||
unsigned int cache_useroffset, cache_usersize;
|
||||
unsigned int size;
|
||||
|
||||
if (!kmalloc_caches[KMALLOC_NORMAL][idx])
|
||||
continue;
|
||||
|
||||
size = kmalloc_caches[KMALLOC_NORMAL][idx]->object_size;
|
||||
if (!size)
|
||||
continue;
|
||||
|
||||
short_size = strchr(kmalloc_caches[KMALLOC_NORMAL][idx]->name, '-');
|
||||
if (WARN_ON(!short_size))
|
||||
goto fail;
|
||||
|
||||
cache_name = kasprintf(GFP_KERNEL, "%s-%s", name, short_size + 1);
|
||||
if (WARN_ON(!cache_name))
|
||||
goto fail;
|
||||
|
||||
if (useroffset >= size) {
|
||||
cache_useroffset = 0;
|
||||
cache_usersize = 0;
|
||||
} else {
|
||||
cache_useroffset = useroffset;
|
||||
cache_usersize = min(size - cache_useroffset, usersize);
|
||||
}
|
||||
(*b)[idx] = kmem_cache_create_usercopy(cache_name, size,
|
||||
0, flags, cache_useroffset,
|
||||
cache_usersize, ctor);
|
||||
kfree(cache_name);
|
||||
if (WARN_ON(!(*b)[idx]))
|
||||
goto fail;
|
||||
}
|
||||
|
||||
return b;
|
||||
|
||||
fail:
|
||||
for (idx = 0; idx < ARRAY_SIZE(kmalloc_caches[KMALLOC_NORMAL]); idx++)
|
||||
kmem_cache_destroy((*b)[idx]);
|
||||
kfree(b);
|
||||
|
||||
return NULL;
|
||||
}
|
||||
EXPORT_SYMBOL(kmem_buckets_create);
|
||||
|
||||
#ifdef SLAB_SUPPORTS_SYSFS
|
||||
/*
|
||||
* For a given kmem_cache, kmem_cache_destroy() should only be called
|
||||
@ -617,11 +709,12 @@ void __init create_boot_cache(struct kmem_cache *s, const char *name,
|
||||
s->size = s->object_size = size;
|
||||
|
||||
/*
|
||||
* For power of two sizes, guarantee natural alignment for kmalloc
|
||||
* caches, regardless of SL*B debugging options.
|
||||
* kmalloc caches guarantee alignment of at least the largest
|
||||
* power-of-two divisor of the size. For power-of-two sizes,
|
||||
* it is the size itself.
|
||||
*/
|
||||
if (is_power_of_2(size))
|
||||
align = max(align, size);
|
||||
if (flags & SLAB_KMALLOC)
|
||||
align = max(align, 1U << (ffs(size) - 1));
|
||||
s->align = calculate_alignment(flags, align, size);
|
||||
|
||||
#ifdef CONFIG_HARDENED_USERCOPY
|
||||
@ -653,8 +746,7 @@ static struct kmem_cache *__init create_kmalloc_cache(const char *name,
|
||||
return s;
|
||||
}
|
||||
|
||||
struct kmem_cache *
|
||||
kmalloc_caches[NR_KMALLOC_TYPES][KMALLOC_SHIFT_HIGH + 1] __ro_after_init =
|
||||
kmem_buckets kmalloc_caches[NR_KMALLOC_TYPES] __ro_after_init =
|
||||
{ /* initialization for https://llvm.org/pr42570 */ };
|
||||
EXPORT_SYMBOL(kmalloc_caches);
|
||||
|
||||
@ -703,7 +795,7 @@ size_t kmalloc_size_roundup(size_t size)
|
||||
* The flags don't matter since size_index is common to all.
|
||||
* Neither does the caller for just getting ->object_size.
|
||||
*/
|
||||
return kmalloc_slab(size, GFP_KERNEL, 0)->object_size;
|
||||
return kmalloc_slab(size, NULL, GFP_KERNEL, 0)->object_size;
|
||||
}
|
||||
|
||||
/* Above the smaller buckets, size is a multiple of page size. */
|
||||
@ -932,6 +1024,11 @@ void __init create_kmalloc_caches(void)
|
||||
|
||||
/* Kmalloc array is now usable */
|
||||
slab_state = UP;
|
||||
|
||||
if (IS_ENABLED(CONFIG_SLAB_BUCKETS))
|
||||
kmem_buckets_cache = kmem_cache_create("kmalloc_buckets",
|
||||
sizeof(kmem_buckets),
|
||||
0, SLAB_NO_MERGE, NULL);
|
||||
}
|
||||
|
||||
/**
|
||||
|
||||
123
mm/slub.c
123
mm/slub.c
@ -788,8 +788,24 @@ static bool slab_add_kunit_errors(void)
|
||||
kunit_put_resource(resource);
|
||||
return true;
|
||||
}
|
||||
|
||||
static bool slab_in_kunit_test(void)
|
||||
{
|
||||
struct kunit_resource *resource;
|
||||
|
||||
if (!kunit_get_current_test())
|
||||
return false;
|
||||
|
||||
resource = kunit_find_named_resource(current->kunit_test, "slab_errors");
|
||||
if (!resource)
|
||||
return false;
|
||||
|
||||
kunit_put_resource(resource);
|
||||
return true;
|
||||
}
|
||||
#else
|
||||
static inline bool slab_add_kunit_errors(void) { return false; }
|
||||
static inline bool slab_in_kunit_test(void) { return false; }
|
||||
#endif
|
||||
|
||||
static inline unsigned int size_from_object(struct kmem_cache *s)
|
||||
@ -962,11 +978,9 @@ void print_tracking(struct kmem_cache *s, void *object)
|
||||
|
||||
static void print_slab_info(const struct slab *slab)
|
||||
{
|
||||
struct folio *folio = (struct folio *)slab_folio(slab);
|
||||
|
||||
pr_err("Slab 0x%p objects=%u used=%u fp=0x%p flags=%pGp\n",
|
||||
slab, slab->objects, slab->inuse, slab->freelist,
|
||||
folio_flags(folio, 0));
|
||||
&slab->__page_flags);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -1192,8 +1206,6 @@ static int check_bytes_and_report(struct kmem_cache *s, struct slab *slab,
|
||||
pr_err("0x%p-0x%p @offset=%tu. First byte 0x%x instead of 0x%x\n",
|
||||
fault, end - 1, fault - addr,
|
||||
fault[0], value);
|
||||
print_trailer(s, slab, object);
|
||||
add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);
|
||||
|
||||
skip_bug_print:
|
||||
restore_bytes(s, what, value, fault, end);
|
||||
@ -1216,8 +1228,8 @@ skip_bug_print:
|
||||
* Padding is extended by another word if Redzoning is enabled and
|
||||
* object_size == inuse.
|
||||
*
|
||||
* We fill with 0xbb (RED_INACTIVE) for inactive objects and with
|
||||
* 0xcc (RED_ACTIVE) for objects in use.
|
||||
* We fill with 0xbb (SLUB_RED_INACTIVE) for inactive objects and with
|
||||
* 0xcc (SLUB_RED_ACTIVE) for objects in use.
|
||||
*
|
||||
* object + s->inuse
|
||||
* Meta data starts here.
|
||||
@ -1302,15 +1314,16 @@ static int check_object(struct kmem_cache *s, struct slab *slab,
|
||||
u8 *p = object;
|
||||
u8 *endobject = object + s->object_size;
|
||||
unsigned int orig_size, kasan_meta_size;
|
||||
int ret = 1;
|
||||
|
||||
if (s->flags & SLAB_RED_ZONE) {
|
||||
if (!check_bytes_and_report(s, slab, object, "Left Redzone",
|
||||
object - s->red_left_pad, val, s->red_left_pad))
|
||||
return 0;
|
||||
ret = 0;
|
||||
|
||||
if (!check_bytes_and_report(s, slab, object, "Right Redzone",
|
||||
endobject, val, s->inuse - s->object_size))
|
||||
return 0;
|
||||
ret = 0;
|
||||
|
||||
if (slub_debug_orig_size(s) && val == SLUB_RED_ACTIVE) {
|
||||
orig_size = get_orig_size(s, object);
|
||||
@ -1319,14 +1332,15 @@ static int check_object(struct kmem_cache *s, struct slab *slab,
|
||||
!check_bytes_and_report(s, slab, object,
|
||||
"kmalloc Redzone", p + orig_size,
|
||||
val, s->object_size - orig_size)) {
|
||||
return 0;
|
||||
ret = 0;
|
||||
}
|
||||
}
|
||||
} else {
|
||||
if ((s->flags & SLAB_POISON) && s->object_size < s->inuse) {
|
||||
check_bytes_and_report(s, slab, p, "Alignment padding",
|
||||
if (!check_bytes_and_report(s, slab, p, "Alignment padding",
|
||||
endobject, POISON_INUSE,
|
||||
s->inuse - s->object_size);
|
||||
s->inuse - s->object_size))
|
||||
ret = 0;
|
||||
}
|
||||
}
|
||||
|
||||
@ -1342,27 +1356,25 @@ static int check_object(struct kmem_cache *s, struct slab *slab,
|
||||
!check_bytes_and_report(s, slab, p, "Poison",
|
||||
p + kasan_meta_size, POISON_FREE,
|
||||
s->object_size - kasan_meta_size - 1))
|
||||
return 0;
|
||||
ret = 0;
|
||||
if (kasan_meta_size < s->object_size &&
|
||||
!check_bytes_and_report(s, slab, p, "End Poison",
|
||||
p + s->object_size - 1, POISON_END, 1))
|
||||
return 0;
|
||||
ret = 0;
|
||||
}
|
||||
/*
|
||||
* check_pad_bytes cleans up on its own.
|
||||
*/
|
||||
check_pad_bytes(s, slab, p);
|
||||
if (!check_pad_bytes(s, slab, p))
|
||||
ret = 0;
|
||||
}
|
||||
|
||||
if (!freeptr_outside_object(s) && val == SLUB_RED_ACTIVE)
|
||||
/*
|
||||
* Object and freepointer overlap. Cannot check
|
||||
* freepointer while object is allocated.
|
||||
* Cannot check freepointer while object is allocated if
|
||||
* object and freepointer overlap.
|
||||
*/
|
||||
return 1;
|
||||
|
||||
/* Check free pointer validity */
|
||||
if (!check_valid_pointer(s, slab, get_freepointer(s, p))) {
|
||||
if ((freeptr_outside_object(s) || val != SLUB_RED_ACTIVE) &&
|
||||
!check_valid_pointer(s, slab, get_freepointer(s, p))) {
|
||||
object_err(s, slab, p, "Freepointer corrupt");
|
||||
/*
|
||||
* No choice but to zap it and thus lose the remainder
|
||||
@ -1370,9 +1382,15 @@ static int check_object(struct kmem_cache *s, struct slab *slab,
|
||||
* another error because the object count is now wrong.
|
||||
*/
|
||||
set_freepointer(s, p, NULL);
|
||||
return 0;
|
||||
ret = 0;
|
||||
}
|
||||
return 1;
|
||||
|
||||
if (!ret && !slab_in_kunit_test()) {
|
||||
print_trailer(s, slab, object);
|
||||
add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int check_slab(struct kmem_cache *s, struct slab *slab)
|
||||
@ -2554,7 +2572,7 @@ static void discard_slab(struct kmem_cache *s, struct slab *slab)
|
||||
*/
|
||||
static inline bool slab_test_node_partial(const struct slab *slab)
|
||||
{
|
||||
return folio_test_workingset((struct folio *)slab_folio(slab));
|
||||
return folio_test_workingset(slab_folio(slab));
|
||||
}
|
||||
|
||||
static inline void slab_set_node_partial(struct slab *slab)
|
||||
@ -4063,7 +4081,7 @@ EXPORT_SYMBOL(kmem_cache_alloc_node_noprof);
|
||||
* directly to the page allocator. We use __GFP_COMP, because we will need to
|
||||
* know the allocation order to free the pages properly in kfree.
|
||||
*/
|
||||
static void *__kmalloc_large_node(size_t size, gfp_t flags, int node)
|
||||
static void *___kmalloc_large_node(size_t size, gfp_t flags, int node)
|
||||
{
|
||||
struct folio *folio;
|
||||
void *ptr = NULL;
|
||||
@ -4088,35 +4106,35 @@ static void *__kmalloc_large_node(size_t size, gfp_t flags, int node)
|
||||
return ptr;
|
||||
}
|
||||
|
||||
void *kmalloc_large_noprof(size_t size, gfp_t flags)
|
||||
void *__kmalloc_large_noprof(size_t size, gfp_t flags)
|
||||
{
|
||||
void *ret = __kmalloc_large_node(size, flags, NUMA_NO_NODE);
|
||||
void *ret = ___kmalloc_large_node(size, flags, NUMA_NO_NODE);
|
||||
|
||||
trace_kmalloc(_RET_IP_, ret, size, PAGE_SIZE << get_order(size),
|
||||
flags, NUMA_NO_NODE);
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(kmalloc_large_noprof);
|
||||
EXPORT_SYMBOL(__kmalloc_large_noprof);
|
||||
|
||||
void *kmalloc_large_node_noprof(size_t size, gfp_t flags, int node)
|
||||
void *__kmalloc_large_node_noprof(size_t size, gfp_t flags, int node)
|
||||
{
|
||||
void *ret = __kmalloc_large_node(size, flags, node);
|
||||
void *ret = ___kmalloc_large_node(size, flags, node);
|
||||
|
||||
trace_kmalloc(_RET_IP_, ret, size, PAGE_SIZE << get_order(size),
|
||||
flags, node);
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(kmalloc_large_node_noprof);
|
||||
EXPORT_SYMBOL(__kmalloc_large_node_noprof);
|
||||
|
||||
static __always_inline
|
||||
void *__do_kmalloc_node(size_t size, gfp_t flags, int node,
|
||||
void *__do_kmalloc_node(size_t size, kmem_buckets *b, gfp_t flags, int node,
|
||||
unsigned long caller)
|
||||
{
|
||||
struct kmem_cache *s;
|
||||
void *ret;
|
||||
|
||||
if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) {
|
||||
ret = __kmalloc_large_node(size, flags, node);
|
||||
ret = __kmalloc_large_node_noprof(size, flags, node);
|
||||
trace_kmalloc(caller, ret, size,
|
||||
PAGE_SIZE << get_order(size), flags, node);
|
||||
return ret;
|
||||
@ -4125,34 +4143,34 @@ void *__do_kmalloc_node(size_t size, gfp_t flags, int node,
|
||||
if (unlikely(!size))
|
||||
return ZERO_SIZE_PTR;
|
||||
|
||||
s = kmalloc_slab(size, flags, caller);
|
||||
s = kmalloc_slab(size, b, flags, caller);
|
||||
|
||||
ret = slab_alloc_node(s, NULL, flags, node, caller, size);
|
||||
ret = kasan_kmalloc(s, ret, size, flags);
|
||||
trace_kmalloc(caller, ret, size, s->size, flags, node);
|
||||
return ret;
|
||||
}
|
||||
|
||||
void *__kmalloc_node_noprof(size_t size, gfp_t flags, int node)
|
||||
void *__kmalloc_node_noprof(DECL_BUCKET_PARAMS(size, b), gfp_t flags, int node)
|
||||
{
|
||||
return __do_kmalloc_node(size, flags, node, _RET_IP_);
|
||||
return __do_kmalloc_node(size, PASS_BUCKET_PARAM(b), flags, node, _RET_IP_);
|
||||
}
|
||||
EXPORT_SYMBOL(__kmalloc_node_noprof);
|
||||
|
||||
void *__kmalloc_noprof(size_t size, gfp_t flags)
|
||||
{
|
||||
return __do_kmalloc_node(size, flags, NUMA_NO_NODE, _RET_IP_);
|
||||
return __do_kmalloc_node(size, NULL, flags, NUMA_NO_NODE, _RET_IP_);
|
||||
}
|
||||
EXPORT_SYMBOL(__kmalloc_noprof);
|
||||
|
||||
void *kmalloc_node_track_caller_noprof(size_t size, gfp_t flags,
|
||||
void *__kmalloc_node_track_caller_noprof(DECL_BUCKET_PARAMS(size, b), gfp_t flags,
|
||||
int node, unsigned long caller)
|
||||
{
|
||||
return __do_kmalloc_node(size, flags, node, caller);
|
||||
}
|
||||
EXPORT_SYMBOL(kmalloc_node_track_caller_noprof);
|
||||
return __do_kmalloc_node(size, PASS_BUCKET_PARAM(b), flags, node, caller);
|
||||
|
||||
void *kmalloc_trace_noprof(struct kmem_cache *s, gfp_t gfpflags, size_t size)
|
||||
}
|
||||
EXPORT_SYMBOL(__kmalloc_node_track_caller_noprof);
|
||||
|
||||
void *__kmalloc_cache_noprof(struct kmem_cache *s, gfp_t gfpflags, size_t size)
|
||||
{
|
||||
void *ret = slab_alloc_node(s, NULL, gfpflags, NUMA_NO_NODE,
|
||||
_RET_IP_, size);
|
||||
@ -4162,9 +4180,9 @@ void *kmalloc_trace_noprof(struct kmem_cache *s, gfp_t gfpflags, size_t size)
|
||||
ret = kasan_kmalloc(s, ret, size, gfpflags);
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(kmalloc_trace_noprof);
|
||||
EXPORT_SYMBOL(__kmalloc_cache_noprof);
|
||||
|
||||
void *kmalloc_node_trace_noprof(struct kmem_cache *s, gfp_t gfpflags,
|
||||
void *__kmalloc_cache_node_noprof(struct kmem_cache *s, gfp_t gfpflags,
|
||||
int node, size_t size)
|
||||
{
|
||||
void *ret = slab_alloc_node(s, NULL, gfpflags, node, _RET_IP_, size);
|
||||
@ -4174,7 +4192,7 @@ void *kmalloc_node_trace_noprof(struct kmem_cache *s, gfp_t gfpflags,
|
||||
ret = kasan_kmalloc(s, ret, size, gfpflags);
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(kmalloc_node_trace_noprof);
|
||||
EXPORT_SYMBOL(__kmalloc_cache_node_noprof);
|
||||
|
||||
static noinline void free_to_partial_list(
|
||||
struct kmem_cache *s, struct slab *slab,
|
||||
@ -5159,10 +5177,9 @@ static int calculate_sizes(struct kmem_cache *s)
|
||||
*/
|
||||
s->inuse = size;
|
||||
|
||||
if (slub_debug_orig_size(s) ||
|
||||
(flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON)) ||
|
||||
((flags & SLAB_RED_ZONE) && s->object_size < sizeof(void *)) ||
|
||||
s->ctor) {
|
||||
if ((flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON)) || s->ctor ||
|
||||
((flags & SLAB_RED_ZONE) &&
|
||||
(s->object_size < sizeof(void *) || slub_debug_orig_size(s)))) {
|
||||
/*
|
||||
* Relocate free pointer after the object if it is not
|
||||
* permitted to overwrite the first word of the object on
|
||||
@ -5170,7 +5187,9 @@ static int calculate_sizes(struct kmem_cache *s)
|
||||
*
|
||||
* This is the case if we do RCU, have a constructor or
|
||||
* destructor, are poisoning the objects, or are
|
||||
* redzoning an object smaller than sizeof(void *).
|
||||
* redzoning an object smaller than sizeof(void *) or are
|
||||
* redzoning an object with slub_debug_orig_size() enabled,
|
||||
* in which case the right redzone may be extended.
|
||||
*
|
||||
* The assumption that s->offset >= s->inuse means free
|
||||
* pointer is outside of the object is used in the
|
||||
|
||||
23
mm/util.c
23
mm/util.c
@ -198,6 +198,16 @@ char *kmemdup_nul(const char *s, size_t len, gfp_t gfp)
|
||||
}
|
||||
EXPORT_SYMBOL(kmemdup_nul);
|
||||
|
||||
static kmem_buckets *user_buckets __ro_after_init;
|
||||
|
||||
static int __init init_user_buckets(void)
|
||||
{
|
||||
user_buckets = kmem_buckets_create("memdup_user", 0, 0, INT_MAX, NULL);
|
||||
|
||||
return 0;
|
||||
}
|
||||
subsys_initcall(init_user_buckets);
|
||||
|
||||
/**
|
||||
* memdup_user - duplicate memory region from user space
|
||||
*
|
||||
@ -211,7 +221,7 @@ void *memdup_user(const void __user *src, size_t len)
|
||||
{
|
||||
void *p;
|
||||
|
||||
p = kmalloc_track_caller(len, GFP_USER | __GFP_NOWARN);
|
||||
p = kmem_buckets_alloc_track_caller(user_buckets, len, GFP_USER | __GFP_NOWARN);
|
||||
if (!p)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
@ -237,7 +247,7 @@ void *vmemdup_user(const void __user *src, size_t len)
|
||||
{
|
||||
void *p;
|
||||
|
||||
p = kvmalloc(len, GFP_USER);
|
||||
p = kmem_buckets_valloc(user_buckets, len, GFP_USER);
|
||||
if (!p)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
@ -594,9 +604,10 @@ unsigned long vm_mmap(struct file *file, unsigned long addr,
|
||||
EXPORT_SYMBOL(vm_mmap);
|
||||
|
||||
/**
|
||||
* kvmalloc_node - attempt to allocate physically contiguous memory, but upon
|
||||
* __kvmalloc_node - attempt to allocate physically contiguous memory, but upon
|
||||
* failure, fall back to non-contiguous (vmalloc) allocation.
|
||||
* @size: size of the request.
|
||||
* @b: which set of kmalloc buckets to allocate from.
|
||||
* @flags: gfp mask for the allocation - must be compatible (superset) with GFP_KERNEL.
|
||||
* @node: numa node to allocate from
|
||||
*
|
||||
@ -609,7 +620,7 @@ EXPORT_SYMBOL(vm_mmap);
|
||||
*
|
||||
* Return: pointer to the allocated memory of %NULL in case of failure
|
||||
*/
|
||||
void *kvmalloc_node_noprof(size_t size, gfp_t flags, int node)
|
||||
void *__kvmalloc_node_noprof(DECL_BUCKET_PARAMS(size, b), gfp_t flags, int node)
|
||||
{
|
||||
gfp_t kmalloc_flags = flags;
|
||||
void *ret;
|
||||
@ -631,7 +642,7 @@ void *kvmalloc_node_noprof(size_t size, gfp_t flags, int node)
|
||||
kmalloc_flags &= ~__GFP_NOFAIL;
|
||||
}
|
||||
|
||||
ret = kmalloc_node_noprof(size, kmalloc_flags, node);
|
||||
ret = __kmalloc_node_noprof(PASS_BUCKET_PARAMS(size, b), kmalloc_flags, node);
|
||||
|
||||
/*
|
||||
* It doesn't really make sense to fallback to vmalloc for sub page
|
||||
@ -660,7 +671,7 @@ void *kvmalloc_node_noprof(size_t size, gfp_t flags, int node)
|
||||
flags, PAGE_KERNEL, VM_ALLOW_HUGE_VMAP,
|
||||
node, __builtin_return_address(0));
|
||||
}
|
||||
EXPORT_SYMBOL(kvmalloc_node_noprof);
|
||||
EXPORT_SYMBOL(__kvmalloc_node_noprof);
|
||||
|
||||
/**
|
||||
* kvfree() - Free memory.
|
||||
|
||||
@ -18,23 +18,16 @@ pub(crate) unsafe fn krealloc_aligned(ptr: *mut u8, new_layout: Layout, flags: F
|
||||
// Customized layouts from `Layout::from_size_align()` can have size < align, so pad first.
|
||||
let layout = new_layout.pad_to_align();
|
||||
|
||||
let mut size = layout.size();
|
||||
|
||||
if layout.align() > bindings::ARCH_SLAB_MINALIGN {
|
||||
// The alignment requirement exceeds the slab guarantee, thus try to enlarge the size
|
||||
// to use the "power-of-two" size/alignment guarantee (see comments in `kmalloc()` for
|
||||
// more information).
|
||||
//
|
||||
// Note that `layout.size()` (after padding) is guaranteed to be a multiple of
|
||||
// `layout.align()`, so `next_power_of_two` gives enough alignment guarantee.
|
||||
size = size.next_power_of_two();
|
||||
}
|
||||
// Note that `layout.size()` (after padding) is guaranteed to be a multiple of `layout.align()`
|
||||
// which together with the slab guarantees means the `krealloc` will return a properly aligned
|
||||
// object (see comments in `kmalloc()` for more information).
|
||||
let size = layout.size();
|
||||
|
||||
// SAFETY:
|
||||
// - `ptr` is either null or a pointer returned from a previous `k{re}alloc()` by the
|
||||
// function safety requirement.
|
||||
// - `size` is greater than 0 since it's either a `layout.size()` (which cannot be zero
|
||||
// according to the function safety requirement) or a result from `next_power_of_two()`.
|
||||
// - `size` is greater than 0 since it's from `layout.size()` (which cannot be zero according
|
||||
// to the function safety requirement)
|
||||
unsafe { bindings::krealloc(ptr as *const core::ffi::c_void, size, flags.0) as *mut u8 }
|
||||
}
|
||||
|
||||
|
||||
@ -1729,6 +1729,7 @@ sub dump_function($$) {
|
||||
$prototype =~ s/__printf\s*\(\s*\d*\s*,\s*\d*\s*\) +//;
|
||||
$prototype =~ s/__(?:re)?alloc_size\s*\(\s*\d+\s*(?:,\s*\d+\s*)?\) +//;
|
||||
$prototype =~ s/__diagnose_as\s*\(\s*\S+\s*(?:,\s*\d+\s*)*\) +//;
|
||||
$prototype =~ s/DECL_BUCKET_PARAMS\s*\(\s*(\S+)\s*,\s*(\S+)\s*\)/$1, $2/;
|
||||
my $define = $prototype =~ s/^#\s*define\s+//; #ak added
|
||||
$prototype =~ s/__attribute_const__ +//;
|
||||
$prototype =~ s/__attribute__\s*\(\(
|
||||
|
||||
@ -47,11 +47,8 @@
|
||||
* Magic nums for obj red zoning.
|
||||
* Placed in the first word before and the first word after an obj.
|
||||
*/
|
||||
#define RED_INACTIVE 0x09F911029D74E35BULL /* when obj is inactive */
|
||||
#define RED_ACTIVE 0xD84156C5635688C0ULL /* when obj is active */
|
||||
|
||||
#define SLUB_RED_INACTIVE 0xbb
|
||||
#define SLUB_RED_ACTIVE 0xcc
|
||||
#define SLUB_RED_INACTIVE 0xbb /* when obj is inactive */
|
||||
#define SLUB_RED_ACTIVE 0xcc /* when obj is active */
|
||||
|
||||
/* ...and for poisoning */
|
||||
#define POISON_INUSE 0x5a /* for use-uninitialised poisoning */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user