Rework the general infrastructure around RANDOM_KMALLOC_CACHES into more flexible KMALLOC_PARTITION_CACHES, with the former being a partitioning mode of the latter.
Introduce a new mode, KMALLOC_PARTITION_TYPED, which leverages a feature available in Clang 22 and later, called "allocation tokens" via __builtin_infer_alloc_token() [1]. Unlike KMALLOC_PARTITION_RANDOM (formerly RANDOM_KMALLOC_CACHES), this mode deterministically assigns a slab cache to an allocation of type T, regardless of allocation site. The builtin __builtin_infer_alloc_token(<malloc-args>, ...) instructs the compiler to infer an allocation type from arguments commonly passed to memory-allocating functions and returns a type-derived token ID. The implementation passes kmalloc-args to the builtin: the compiler performs best-effort type inference, and then recognizes common patterns such as `kmalloc(sizeof(T), ...)`, `kmalloc(sizeof(T) * n, ...)`, but also `(T *)kmalloc(...)`. Where the compiler fails to infer a type the fallback token (default: 0) is chosen. Note: kmalloc_obj(..) APIs fix the pattern how size and result type are expressed, and therefore ensures there's not much drift in which patterns the compiler needs to recognize. Specifically, kmalloc_obj() and friends expand to `(TYPE *)KMALLOC(__obj_size, GFP)`, which the compiler recognizes via the cast to TYPE*. Clang's default token ID calculation is described as [1]: typehashpointersplit: This mode assigns a token ID based on the hash of the allocated type's name, where the top half ID-space is reserved for types that contain pointers and the bottom half for types that do not contain pointers. Separating pointer-containing objects from pointerless objects and data allocations can help mitigate certain classes of memory corruption exploits [2]: attackers who gains a buffer overflow on a primitive buffer cannot use it to directly corrupt pointers or other critical metadata in an object residing in a different, isolated heap region. It is important to note that heap isolation strategies offer a best-effort approach, and do not provide a 100% security guarantee, albeit achievable at relatively low performance cost. Note that this also does not prevent cross-cache attacks: while waiting for future features like SLAB_VIRTUAL [3] to provide physical page isolation, this feature should be deployed alongside SHUFFLE_PAGE_ALLOCATOR and init_on_free=1 to mitigate cross-cache attacks and page-reuse attacks as much as possible today. With all that, my kernel (x86 defconfig) shows me a histogram of slab cache object distribution per /proc/slabinfo (after boot): <slab cache> <objs> <hist> kmalloc-part-15 1465 ++++++++++++++ kmalloc-part-14 2988 +++++++++++++++++++++++++++++ kmalloc-part-13 1656 ++++++++++++++++ kmalloc-part-12 1045 ++++++++++ kmalloc-part-11 1697 ++++++++++++++++ kmalloc-part-10 1489 ++++++++++++++ kmalloc-part-09 965 +++++++++ kmalloc-part-08 710 +++++++ kmalloc-part-07 100 + kmalloc-part-06 217 ++ kmalloc-part-05 105 + kmalloc-part-04 4047 ++++++++++++++++++++++++++++++++++++++++ kmalloc-part-03 183 + kmalloc-part-02 283 ++ kmalloc-part-01 316 +++ kmalloc 1422 ++++++++++++++ The above /proc/slabinfo snapshot shows me there are 6673 allocated objects (slabs 00 - 07) that the compiler claims contain no pointers or it was unable to infer the type of, and 12015 objects that contain pointers (slabs 08 - 15). On a whole, this looks relatively sane. Additionally, when I compile my kernel with -Rpass=alloc-token, which provides diagnostics where (after dead-code elimination) type inference failed, I see 186 allocation sites where the compiler failed to identify a type (down from 966 when I sent the RFC [4]). Some initial review confirms these are mostly variable sized buffers, but also include structs with trailing flexible length arrays. Link: https://clang.llvm.org/docs/AllocToken.html [1] Link: https://blog.dfsec.com/ios/2025/05/30/blasting-past-ios-18/ [2] Link: https://lwn.net/Articles/944647/ [3] Link: https://lore.kernel.org/all/[email protected]/ [4] Link: https://discourse.llvm.org/t/rfc-a-framework-for-allocator-partitioning-hints/87434 Acked-by: GONG Ruiqi <[email protected]> Co-developed-by: Harry Yoo (Oracle) <[email protected]> Signed-off-by: Harry Yoo (Oracle) <[email protected]> Signed-off-by: Marco Elver <[email protected]> --- v3: * Introduce DECL_TOKEN_PARAMS / PASS_TOKEN_PARAMS (suggested-by Harry). * Rename {RANDOM,TYPED}_KMALLOC_CACHES to KMALLOC_PARTITION_{RANDOM,TYPED}, so it's more easily searchable and consistent with the top-level name with the variant at the end of the CONFIG phrase (reported-by Kees). * Make KMALLOC_PARTITION_TYPED default if available (suggested-by Kees). * Add RANDOM_KMALLOC_CACHES transitional option (suggested-by Kees). * Add CC_HAS_ALLOC_TOKEN and use it (reported-by Kees). v2: https://lore.kernel.org/all/[email protected]/ * Avoid empty function argument if !KMALLOC_PARTITION_CACHES (co-developed-by Harry). While Clang does optimize out the empty struct argument (and generated code is identical to before if KMALLOC_PARTITION_CACHES is disabled), GCC doesn't do so. So we need to fully remove the argument if not actually required. * Cover krealloc() which was missed before, resulting in ~100 additional objects in the pointer-containing caches in above histogram. * Unify kmalloc_token_t definition. * Expand Kconfig help text. v1: https://lore.kernel.org/all/[email protected]/ * Rebase and switch to builtin name that was released in Clang 22. * Keep RANDOM_KMALLOC_CACHES the default. RFC: https://lore.kernel.org/all/[email protected]/ --- Makefile | 5 ++ include/linux/percpu.h | 2 +- include/linux/slab.h | 136 +++++++++++++++++++++----------- init/Kconfig | 3 + kernel/configs/hardening.config | 2 +- mm/Kconfig | 73 ++++++++++++++--- mm/kfence/kfence_test.c | 4 +- mm/slab.h | 4 +- mm/slab_common.c | 52 ++++++------ mm/slub.c | 54 +++++++------ 10 files changed, 220 insertions(+), 115 deletions(-) diff --git a/Makefile b/Makefile index 54e1ae602000..afe663bdb9c0 100644 --- a/Makefile +++ b/Makefile @@ -989,6 +989,11 @@ KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) endif endif +ifdef CONFIG_KMALLOC_PARTITION_TYPED +# KMALLOC_PARTITION_CACHES_NR + 1 +KBUILD_CFLAGS += -falloc-token-max=16 +endif + ifdef CONFIG_CC_IS_CLANG ifdef CONFIG_CC_HAS_COUNTED_BY_PTR KBUILD_CFLAGS += -fexperimental-late-parse-attributes diff --git a/include/linux/percpu.h b/include/linux/percpu.h index 85bf8dd9f087..bdb721dac0e3 100644 --- a/include/linux/percpu.h +++ b/include/linux/percpu.h @@ -36,7 +36,7 @@ #define PCPU_BITMAP_BLOCK_BITS (PCPU_BITMAP_BLOCK_SIZE >> \ PCPU_MIN_ALLOC_SHIFT) -#ifdef CONFIG_RANDOM_KMALLOC_CACHES +#ifdef CONFIG_KMALLOC_PARTITION_CACHES # if defined(CONFIG_LOCKDEP) && !defined(CONFIG_PAGE_SIZE_4KB) # define PERCPU_DYNAMIC_SIZE_SHIFT 13 # else diff --git a/include/linux/slab.h b/include/linux/slab.h index 15a60b501b95..c232f8a10af6 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -499,14 +499,38 @@ int kmem_cache_shrink(struct kmem_cache *s); .usersize = sizeof_field(struct __struct, __field), \ }, (__flags)) +#ifdef CONFIG_KMALLOC_PARTITION_CACHES +typedef struct { unsigned long v; } kmalloc_token_t; +#ifdef CONFIG_KMALLOC_PARTITION_RANDOM +extern unsigned long random_kmalloc_seed; +#define __kmalloc_token(...) ((kmalloc_token_t){ .v = _RET_IP_ }) +#elif defined(CONFIG_KMALLOC_PARTITION_TYPED) +#define __kmalloc_token(...) ((kmalloc_token_t){ .v = __builtin_infer_alloc_token(__VA_ARGS__) }) +#endif +#define DECL_TOKEN_PARAM(_token) , kmalloc_token_t (_token) +#define _PASS_TOKEN_PARAM(_token) , (_token) +#define PASS_TOKEN_PARAM(_token) (_token) +#define DECL_TOKEN_PARAMS(_size, _token) size_t (_size), kmalloc_token_t (_token) +#define PASS_TOKEN_PARAMS(_size, _token) (_size), (_token) +#else /* !CONFIG_KMALLOC_PARTITION_CACHES */ +typedef struct {} kmalloc_token_t; +#define __kmalloc_token(...) ((kmalloc_token_t){}) /* no-op */ +#define DECL_TOKEN_PARAM(_token) +#define _PASS_TOKEN_PARAM(_token) +#define PASS_TOKEN_PARAM(_token) ((kmalloc_token_t){}) +#define DECL_TOKEN_PARAMS(_size, _token) size_t (_size) +#define PASS_TOKEN_PARAMS(_size, _token) (_size) +#endif /* CONFIG_KMALLOC_PARTITION_CACHES */ + /* * Common kmalloc functions provided by all allocators */ -void * __must_check krealloc_node_align_noprof(const void *objp, size_t new_size, +void * __must_check krealloc_node_align_noprof(const void *objp, + DECL_TOKEN_PARAMS(new_size, token), unsigned long align, gfp_t flags, int nid) __realloc_size(2); -#define krealloc_noprof(_o, _s, _f) krealloc_node_align_noprof(_o, _s, 1, _f, NUMA_NO_NODE) -#define krealloc_node_align(...) alloc_hooks(krealloc_node_align_noprof(__VA_ARGS__)) +#define krealloc_noprof(_o, _s, _f) krealloc_node_align_noprof(_o, PASS_TOKEN_PARAMS(_s, __kmalloc_token(_s)), 1, _f, NUMA_NO_NODE) +#define krealloc_node_align(_o, _s, _a, _f, _n) alloc_hooks(krealloc_node_align_noprof(_o, PASS_TOKEN_PARAMS(_s, __kmalloc_token(_s)), _a, _f, _n)) #define krealloc_node(_o, _s, _f, _n) krealloc_node_align(_o, _s, 1, _f, _n) #define krealloc(...) krealloc_node(__VA_ARGS__, NUMA_NO_NODE) @@ -612,10 +636,10 @@ static inline unsigned int arch_slab_minalign(void) #define SLAB_OBJ_MIN_SIZE (KMALLOC_MIN_SIZE < 16 ? \ (KMALLOC_MIN_SIZE) : 16) -#ifdef CONFIG_RANDOM_KMALLOC_CACHES -#define RANDOM_KMALLOC_CACHES_NR 15 // # of cache copies +#ifdef CONFIG_KMALLOC_PARTITION_CACHES +#define KMALLOC_PARTITION_CACHES_NR 15 // # of cache copies #else -#define RANDOM_KMALLOC_CACHES_NR 0 +#define KMALLOC_PARTITION_CACHES_NR 0 #endif /* @@ -634,8 +658,8 @@ enum kmalloc_cache_type { #ifndef CONFIG_MEMCG KMALLOC_CGROUP = KMALLOC_NORMAL, #endif - KMALLOC_RANDOM_START = KMALLOC_NORMAL, - KMALLOC_RANDOM_END = KMALLOC_RANDOM_START + RANDOM_KMALLOC_CACHES_NR, + KMALLOC_PARTITION_START = KMALLOC_NORMAL, + KMALLOC_PARTITION_END = KMALLOC_PARTITION_START + KMALLOC_PARTITION_CACHES_NR, #ifdef CONFIG_SLUB_TINY KMALLOC_RECLAIM = KMALLOC_NORMAL, #else @@ -662,19 +686,19 @@ extern kmem_buckets kmalloc_caches[NR_KMALLOC_TYPES]; (IS_ENABLED(CONFIG_ZONE_DMA) ? __GFP_DMA : 0) | \ (IS_ENABLED(CONFIG_MEMCG) ? __GFP_ACCOUNT : 0)) -extern unsigned long random_kmalloc_seed; - -static __always_inline enum kmalloc_cache_type kmalloc_type(gfp_t flags, unsigned long caller) +static __always_inline enum kmalloc_cache_type kmalloc_type(gfp_t flags, kmalloc_token_t token) { /* * The most common case is KMALLOC_NORMAL, so test for it * with a single branch for all the relevant flags. */ if (likely((flags & KMALLOC_NOT_NORMAL_BITS) == 0)) -#ifdef CONFIG_RANDOM_KMALLOC_CACHES - /* RANDOM_KMALLOC_CACHES_NR (=15) copies + the KMALLOC_NORMAL */ - return KMALLOC_RANDOM_START + hash_64(caller ^ random_kmalloc_seed, - ilog2(RANDOM_KMALLOC_CACHES_NR + 1)); +#ifdef CONFIG_KMALLOC_PARTITION_RANDOM + /* KMALLOC_PARTITION_CACHES_NR (=15) copies + the KMALLOC_NORMAL */ + return KMALLOC_PARTITION_START + hash_64(token.v ^ random_kmalloc_seed, + ilog2(KMALLOC_PARTITION_CACHES_NR + 1)); +#elif defined(CONFIG_KMALLOC_PARTITION_TYPED) + return KMALLOC_PARTITION_START + token.v; #else return KMALLOC_NORMAL; #endif @@ -858,16 +882,22 @@ unsigned int kmem_cache_sheaf_size(struct slab_sheaf *sheaf); #define PASS_BUCKET_PARAM(_b) NULL #endif +#define DECL_KMALLOC_PARAMS(_size, _b, _token) DECL_BUCKET_PARAMS(_size, _b) \ + DECL_TOKEN_PARAM(_token) + +#define PASS_KMALLOC_PARAMS(_size, _b, _token) PASS_BUCKET_PARAMS(_size, _b) \ + _PASS_TOKEN_PARAM(_token) + /* * The following functions are not to be used directly and are intended only * for internal use from kmalloc() and kmalloc_node() * with the exception of kunit tests */ -void *__kmalloc_noprof(size_t size, gfp_t flags) +void *__kmalloc_noprof(DECL_KMALLOC_PARAMS(size, b, token), gfp_t flags) __assume_kmalloc_alignment __alloc_size(1); -void *__kmalloc_node_noprof(DECL_BUCKET_PARAMS(size, b), gfp_t flags, int node) +void *__kmalloc_node_noprof(DECL_KMALLOC_PARAMS(size, b, token), gfp_t flags, int node) __assume_kmalloc_alignment __alloc_size(1); void *__kmalloc_cache_noprof(struct kmem_cache *s, gfp_t flags, size_t size) @@ -938,7 +968,7 @@ void *__kmalloc_large_node_noprof(size_t size, gfp_t flags, int node) * Try really hard to succeed the allocation but fail * eventually. */ -static __always_inline __alloc_size(1) void *kmalloc_noprof(size_t size, gfp_t flags) +static __always_inline __alloc_size(1) void *_kmalloc_noprof(size_t size, gfp_t flags, kmalloc_token_t token) { if (__builtin_constant_p(size) && size) { unsigned int index; @@ -948,14 +978,16 @@ static __always_inline __alloc_size(1) void *kmalloc_noprof(size_t size, gfp_t f index = kmalloc_index(size); return __kmalloc_cache_noprof( - kmalloc_caches[kmalloc_type(flags, _RET_IP_)][index], + kmalloc_caches[kmalloc_type(flags, token)][index], flags, size); } - return __kmalloc_noprof(size, flags); + return __kmalloc_noprof(PASS_KMALLOC_PARAMS(size, NULL, token), flags); } +#define kmalloc_noprof(...) _kmalloc_noprof(__VA_ARGS__, __kmalloc_token(__VA_ARGS__)) #define kmalloc(...) alloc_hooks(kmalloc_noprof(__VA_ARGS__)) -void *kmalloc_nolock_noprof(size_t size, gfp_t gfp_flags, int node); +void *_kmalloc_nolock_noprof(DECL_TOKEN_PARAMS(size, token), gfp_t gfp_flags, int node); +#define kmalloc_nolock_noprof(_s, _f, _n) _kmalloc_nolock_noprof(PASS_TOKEN_PARAMS(_s, __kmalloc_token(_s)), _f, _n) #define kmalloc_nolock(...) alloc_hooks(kmalloc_nolock_noprof(__VA_ARGS__)) /** @@ -1060,12 +1092,12 @@ void *kmalloc_nolock_noprof(size_t size, gfp_t gfp_flags, int node); __alloc_flex(kvzalloc, default_gfp(__VA_ARGS__), typeof(P), FAM, COUNT) #define kmem_buckets_alloc(_b, _size, _flags) \ - alloc_hooks(__kmalloc_node_noprof(PASS_BUCKET_PARAMS(_size, _b), _flags, NUMA_NO_NODE)) + alloc_hooks(__kmalloc_node_noprof(PASS_KMALLOC_PARAMS(_size, _b, __kmalloc_token(_size)), _flags, NUMA_NO_NODE)) #define kmem_buckets_alloc_track_caller(_b, _size, _flags) \ - alloc_hooks(__kmalloc_node_track_caller_noprof(PASS_BUCKET_PARAMS(_size, _b), _flags, NUMA_NO_NODE, _RET_IP_)) + alloc_hooks(__kmalloc_node_track_caller_noprof(PASS_KMALLOC_PARAMS(_size, _b, __kmalloc_token(_size)), _flags, NUMA_NO_NODE, _RET_IP_)) -static __always_inline __alloc_size(1) void *kmalloc_node_noprof(size_t size, gfp_t flags, int node) +static __always_inline __alloc_size(1) void *_kmalloc_node_noprof(size_t size, gfp_t flags, int node, kmalloc_token_t token) { if (__builtin_constant_p(size) && size) { unsigned int index; @@ -1075,11 +1107,12 @@ static __always_inline __alloc_size(1) void *kmalloc_node_noprof(size_t size, gf index = kmalloc_index(size); return __kmalloc_cache_node_noprof( - kmalloc_caches[kmalloc_type(flags, _RET_IP_)][index], + kmalloc_caches[kmalloc_type(flags, token)][index], flags, node, size); } - return __kmalloc_node_noprof(PASS_BUCKET_PARAMS(size, NULL), flags, node); + return __kmalloc_node_noprof(PASS_KMALLOC_PARAMS(size, NULL, token), flags, node); } +#define kmalloc_node_noprof(...) _kmalloc_node_noprof(__VA_ARGS__, __kmalloc_token(__VA_ARGS__)) #define kmalloc_node(...) alloc_hooks(kmalloc_node_noprof(__VA_ARGS__)) /** @@ -1088,14 +1121,15 @@ static __always_inline __alloc_size(1) void *kmalloc_node_noprof(size_t size, gf * @size: element size. * @flags: the type of memory to allocate (see kmalloc). */ -static inline __alloc_size(1, 2) void *kmalloc_array_noprof(size_t n, size_t size, gfp_t flags) +static inline __alloc_size(1, 2) void *_kmalloc_array_noprof(size_t n, size_t size, gfp_t flags, kmalloc_token_t token) { size_t bytes; if (unlikely(check_mul_overflow(n, size, &bytes))) return NULL; - return kmalloc_noprof(bytes, flags); + return _kmalloc_noprof(bytes, flags, token); } +#define kmalloc_array_noprof(...) _kmalloc_array_noprof(__VA_ARGS__, __kmalloc_token(__VA_ARGS__)) #define kmalloc_array(...) alloc_hooks(kmalloc_array_noprof(__VA_ARGS__)) /** @@ -1115,18 +1149,19 @@ static inline __alloc_size(1, 2) void *kmalloc_array_noprof(size_t n, size_t siz * In any case, the contents of the object pointed to are preserved up to the * lesser of the new and old sizes. */ -static inline __realloc_size(2, 3) void * __must_check krealloc_array_noprof(void *p, +static inline __realloc_size(2, 3) void * __must_check _krealloc_array_noprof(void *p, size_t new_n, size_t new_size, - gfp_t flags) + gfp_t flags, kmalloc_token_t token) { size_t bytes; if (unlikely(check_mul_overflow(new_n, new_size, &bytes))) return NULL; - return krealloc_noprof(p, bytes, flags); + return krealloc_node_align_noprof(p, PASS_TOKEN_PARAMS(bytes, token), 1, flags, NUMA_NO_NODE); } +#define krealloc_array_noprof(...) _krealloc_array_noprof(__VA_ARGS__, __kmalloc_token(__VA_ARGS__)) #define krealloc_array(...) alloc_hooks(krealloc_array_noprof(__VA_ARGS__)) /** @@ -1137,10 +1172,10 @@ static inline __realloc_size(2, 3) void * __must_check krealloc_array_noprof(voi */ #define kcalloc(n, size, flags) kmalloc_array(n, size, (flags) | __GFP_ZERO) -void *__kmalloc_node_track_caller_noprof(DECL_BUCKET_PARAMS(size, b), gfp_t flags, int node, +void *__kmalloc_node_track_caller_noprof(DECL_KMALLOC_PARAMS(size, b, token), gfp_t flags, int node, unsigned long caller) __alloc_size(1); #define kmalloc_node_track_caller_noprof(size, flags, node, caller) \ - __kmalloc_node_track_caller_noprof(PASS_BUCKET_PARAMS(size, NULL), flags, node, caller) + __kmalloc_node_track_caller_noprof(PASS_KMALLOC_PARAMS(size, NULL, __kmalloc_token(size)), flags, node, caller) #define kmalloc_node_track_caller(...) \ alloc_hooks(kmalloc_node_track_caller_noprof(__VA_ARGS__, _RET_IP_)) @@ -1157,17 +1192,18 @@ void *__kmalloc_node_track_caller_noprof(DECL_BUCKET_PARAMS(size, b), gfp_t flag #define kmalloc_track_caller_noprof(...) \ kmalloc_node_track_caller_noprof(__VA_ARGS__, NUMA_NO_NODE, _RET_IP_) -static inline __alloc_size(1, 2) void *kmalloc_array_node_noprof(size_t n, size_t size, gfp_t flags, - int node) +static inline __alloc_size(1, 2) void *_kmalloc_array_node_noprof(size_t n, size_t size, gfp_t flags, + int node, kmalloc_token_t token) { size_t bytes; if (unlikely(check_mul_overflow(n, size, &bytes))) return NULL; if (__builtin_constant_p(n) && __builtin_constant_p(size)) - return kmalloc_node_noprof(bytes, flags, node); - return __kmalloc_node_noprof(PASS_BUCKET_PARAMS(bytes, NULL), flags, node); + return _kmalloc_node_noprof(bytes, flags, node, token); + return __kmalloc_node_noprof(PASS_KMALLOC_PARAMS(bytes, NULL, token), flags, node); } +#define kmalloc_array_node_noprof(...) _kmalloc_array_node_noprof(__VA_ARGS__, __kmalloc_token(__VA_ARGS__)) #define kmalloc_array_node(...) alloc_hooks(kmalloc_array_node_noprof(__VA_ARGS__)) #define kcalloc_node(_n, _size, _flags, _node) \ @@ -1183,39 +1219,43 @@ static inline __alloc_size(1, 2) void *kmalloc_array_node_noprof(size_t n, size_ * @size: how many bytes of memory are required. * @flags: the type of memory to allocate (see kmalloc). */ -static inline __alloc_size(1) void *kzalloc_noprof(size_t size, gfp_t flags) +static inline __alloc_size(1) void *_kzalloc_noprof(size_t size, gfp_t flags, kmalloc_token_t token) { - return kmalloc_noprof(size, flags | __GFP_ZERO); + return _kmalloc_noprof(size, flags | __GFP_ZERO, token); } +#define kzalloc_noprof(...) _kzalloc_noprof(__VA_ARGS__, __kmalloc_token(__VA_ARGS__)) #define kzalloc(...) alloc_hooks(kzalloc_noprof(__VA_ARGS__)) #define kzalloc_node(_size, _flags, _node) kmalloc_node(_size, (_flags)|__GFP_ZERO, _node) -void *__kvmalloc_node_noprof(DECL_BUCKET_PARAMS(size, b), unsigned long align, +void *__kvmalloc_node_noprof(DECL_KMALLOC_PARAMS(size, b, token), unsigned long align, gfp_t flags, int node) __alloc_size(1); #define kvmalloc_node_align_noprof(_size, _align, _flags, _node) \ - __kvmalloc_node_noprof(PASS_BUCKET_PARAMS(_size, NULL), _align, _flags, _node) + __kvmalloc_node_noprof(PASS_KMALLOC_PARAMS(_size, NULL, __kmalloc_token(_size)), _align, _flags, _node) #define kvmalloc_node_align(...) \ alloc_hooks(kvmalloc_node_align_noprof(__VA_ARGS__)) #define kvmalloc_node(_s, _f, _n) kvmalloc_node_align(_s, 1, _f, _n) +#define kvmalloc_node_noprof(size, flags, node) \ + kvmalloc_node_align_noprof(size, 1, flags, node) #define kvmalloc(...) kvmalloc_node(__VA_ARGS__, NUMA_NO_NODE) +#define kvmalloc_noprof(_size, _flags) kvmalloc_node_noprof(_size, _flags, NUMA_NO_NODE) #define kvzalloc(_size, _flags) kvmalloc(_size, (_flags)|__GFP_ZERO) #define kvzalloc_node(_size, _flags, _node) kvmalloc_node(_size, (_flags)|__GFP_ZERO, _node) #define kmem_buckets_valloc(_b, _size, _flags) \ - alloc_hooks(__kvmalloc_node_noprof(PASS_BUCKET_PARAMS(_size, _b), 1, _flags, NUMA_NO_NODE)) + alloc_hooks(__kvmalloc_node_noprof(PASS_KMALLOC_PARAMS(_size, _b, __kmalloc_token(_size)), 1, _flags, NUMA_NO_NODE)) static inline __alloc_size(1, 2) void * -kvmalloc_array_node_noprof(size_t n, size_t size, gfp_t flags, int node) +_kvmalloc_array_node_noprof(size_t n, size_t size, gfp_t flags, int node, kmalloc_token_t token) { size_t bytes; if (unlikely(check_mul_overflow(n, size, &bytes))) return NULL; - return kvmalloc_node_align_noprof(bytes, 1, flags, node); + return __kvmalloc_node_noprof(PASS_KMALLOC_PARAMS(bytes, NULL, token), 1, flags, node); } - +#define kvmalloc_array_node_noprof(...) _kvmalloc_array_node_noprof(__VA_ARGS__, __kmalloc_token(__VA_ARGS__)) #define kvmalloc_array_noprof(...) kvmalloc_array_node_noprof(__VA_ARGS__, NUMA_NO_NODE) #define kvcalloc_node_noprof(_n,_s,_f,_node) kvmalloc_array_node_noprof(_n,_s,(_f)|__GFP_ZERO,_node) #define kvcalloc_noprof(...) kvcalloc_node_noprof(__VA_ARGS__, NUMA_NO_NODE) @@ -1224,10 +1264,10 @@ kvmalloc_array_node_noprof(size_t n, size_t size, gfp_t flags, int node) #define kvcalloc_node(...) alloc_hooks(kvcalloc_node_noprof(__VA_ARGS__)) #define kvcalloc(...) alloc_hooks(kvcalloc_noprof(__VA_ARGS__)) -void *kvrealloc_node_align_noprof(const void *p, size_t size, unsigned long align, +void *kvrealloc_node_align_noprof(const void *p, DECL_TOKEN_PARAMS(size, token), unsigned long align, gfp_t flags, int nid) __realloc_size(2); -#define kvrealloc_node_align(...) \ - alloc_hooks(kvrealloc_node_align_noprof(__VA_ARGS__)) +#define kvrealloc_node_align(_p, _s, _a, _f, _n) \ + alloc_hooks(kvrealloc_node_align_noprof(_p, PASS_TOKEN_PARAMS(_s, __kmalloc_token(_s)), _a, _f, _n)) #define kvrealloc_node(_p, _s, _f, _n) kvrealloc_node_align(_p, _s, 1, _f, _n) #define kvrealloc(...) kvrealloc_node(__VA_ARGS__, NUMA_NO_NODE) diff --git a/init/Kconfig b/init/Kconfig index 2937c4d308ae..dba97bc8e2ce 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -170,6 +170,9 @@ config CC_HAS_BROKEN_COUNTED_BY_REF # https://github.com/llvm/llvm-project/issues/182575 default y if CC_IS_CLANG && CLANG_VERSION < 220100 +config CC_HAS_ALLOC_TOKEN + def_bool $(cc-option,-falloc-token-max=123) + config CC_HAS_MULTIDIMENSIONAL_NONSTRING def_bool $(success,echo 'char tag[][4] __attribute__((__nonstring__)) = { };' | $(CC) $(CLANG_FLAGS) -x c - -c -o /dev/null -Werror) diff --git a/kernel/configs/hardening.config b/kernel/configs/hardening.config index 7c3924614e01..26831a2a5739 100644 --- a/kernel/configs/hardening.config +++ b/kernel/configs/hardening.config @@ -22,7 +22,7 @@ CONFIG_SLAB_FREELIST_RANDOM=y CONFIG_SLAB_FREELIST_HARDENED=y CONFIG_SLAB_BUCKETS=y CONFIG_SHUFFLE_PAGE_ALLOCATOR=y -CONFIG_RANDOM_KMALLOC_CACHES=y +CONFIG_KMALLOC_PARTITION_CACHES=y # Sanity check userspace page table mappings. CONFIG_PAGE_TABLE_CHECK=y diff --git a/mm/Kconfig b/mm/Kconfig index e8bf1e9e6ad9..4f187b07eb48 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -248,22 +248,75 @@ config SLUB_STATS out which slabs are relevant to a particular load. Try running: slabinfo -DA -config RANDOM_KMALLOC_CACHES - default n +config KMALLOC_PARTITION_CACHES depends on !SLUB_TINY - bool "Randomize slab caches for normal kmalloc" + bool "Partitioned slab caches for normal kmalloc" + default RANDOM_KMALLOC_CACHES help - A hardening feature that creates multiple copies of slab caches for - normal kmalloc allocation and makes kmalloc randomly pick one based - on code address, which makes the attackers more difficult to spray - vulnerable memory objects on the heap for the purpose of exploiting - memory vulnerabilities. + A hardening feature that creates multiple isolated copies of slab + caches for normal kmalloc allocations. This makes it more difficult + to exploit memory-safety vulnerabilities by attacking vulnerable + co-located memory objects. Several modes are provided. Currently the number of copies is set to 16, a reasonably large value that effectively diverges the memory objects allocated for different subsystems or modules into different caches, at the expense of a - limited degree of memory and CPU overhead that relates to hardware and - system workload. + limited degree of memory and CPU overhead that relates to hardware + and system workload. + +choice + prompt "Partitioned slab cache mode" + depends on KMALLOC_PARTITION_CACHES + default KMALLOC_PARTITION_TYPED if CC_HAS_ALLOC_TOKEN + default KMALLOC_PARTITION_RANDOM + help + Selects the slab cache partitioning mode. + +config KMALLOC_PARTITION_RANDOM + bool "Randomize slab caches for normal kmalloc" + help + Randomly pick a slab cache based on code address and a per-boot + random seed. + + This makes it harder for attackers to predict object co-location. + The placement is random: while attackers don't know which kmalloc + cache an object will be allocated from, they might circumvent + the randomization by retrying attacks across multiple machines until + the target objects are co-located. + +config KMALLOC_PARTITION_TYPED + bool "Type based slab cache selection for normal kmalloc" + depends on CC_HAS_ALLOC_TOKEN + help + Rely on Clang's allocation tokens to choose a slab cache, where token + IDs are derived from the allocated type. + + Unlike KMALLOC_PARTITION_RANDOM, cache assignment is deterministic based + on type, which guarantees that objects of certain types are not + placed in the same cache. This effectively mitigates certain classes + of exploits that probabilistic defenses like KMALLOC_PARTITION_RANDOM + only make harder but not impossible. However, this also means the + cache assignment is predictable. + + Clang's default token ID calculation returns a bounded hash with + disjoint ranges for pointer-containing and pointerless objects: when + used as the slab cache index, this prevents buffer overflows on + primitive buffers from directly corrupting pointer-containing + objects. + + The current effectiveness of Clang's type inference can be judged by + -Rpass=alloc-token, which provides diagnostics where (after dead-code + elimination) type inference failed. + + Requires Clang 22 or later. + +endchoice + +config RANDOM_KMALLOC_CACHES + bool + transitional + help + Transitional config for migration to KMALLOC_PARTITION_CACHES. endmenu # Slab allocator options diff --git a/mm/kfence/kfence_test.c b/mm/kfence/kfence_test.c index 5725a367246d..8807ea8ed0d3 100644 --- a/mm/kfence/kfence_test.c +++ b/mm/kfence/kfence_test.c @@ -214,7 +214,7 @@ static void test_cache_destroy(void) static inline size_t kmalloc_cache_alignment(size_t size) { /* just to get ->align so no need to pass in the real caller */ - enum kmalloc_cache_type type = kmalloc_type(GFP_KERNEL, 0); + enum kmalloc_cache_type type = kmalloc_type(GFP_KERNEL, __kmalloc_token(0)); return kmalloc_caches[type][__kmalloc_index(size, false)]->align; } @@ -285,7 +285,7 @@ static void *test_alloc(struct kunit *test, size_t size, gfp_t gfp, enum allocat if (is_kfence_address(alloc)) { struct slab *slab = virt_to_slab(alloc); - enum kmalloc_cache_type type = kmalloc_type(GFP_KERNEL, _RET_IP_); + enum kmalloc_cache_type type = kmalloc_type(GFP_KERNEL, __kmalloc_token(size)); struct kmem_cache *s = test_cache ?: kmalloc_caches[type][__kmalloc_index(size, false)]; diff --git a/mm/slab.h b/mm/slab.h index bf2f87acf5e3..1bf9c3021ae3 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -362,12 +362,12 @@ 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, kmem_buckets *b, gfp_t flags, unsigned long caller) +kmalloc_slab(size_t size, kmem_buckets *b, gfp_t flags, kmalloc_token_t token) { unsigned int index; if (!b) - b = &kmalloc_caches[kmalloc_type(flags, caller)]; + b = &kmalloc_caches[kmalloc_type(flags, token)]; if (size <= 192) index = kmalloc_size_index[size_index_elem(size)]; else diff --git a/mm/slab_common.c b/mm/slab_common.c index d5a70a831a2a..388eb5980859 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -742,7 +742,7 @@ kmem_buckets kmalloc_caches[NR_KMALLOC_TYPES] __ro_after_init = { /* initialization for https://llvm.org/pr42570 */ }; EXPORT_SYMBOL(kmalloc_caches); -#ifdef CONFIG_RANDOM_KMALLOC_CACHES +#ifdef CONFIG_KMALLOC_PARTITION_RANDOM unsigned long random_kmalloc_seed __ro_after_init; EXPORT_SYMBOL(random_kmalloc_seed); #endif @@ -787,7 +787,7 @@ 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, NULL, GFP_KERNEL, 0)->object_size; + return kmalloc_slab(size, NULL, GFP_KERNEL, __kmalloc_token(0))->object_size; } /* Above the smaller buckets, size is a multiple of page size. */ @@ -821,26 +821,26 @@ EXPORT_SYMBOL(kmalloc_size_roundup); #define KMALLOC_RCL_NAME(sz) #endif -#ifdef CONFIG_RANDOM_KMALLOC_CACHES -#define __KMALLOC_RANDOM_CONCAT(a, b) a ## b -#define KMALLOC_RANDOM_NAME(N, sz) __KMALLOC_RANDOM_CONCAT(KMA_RAND_, N)(sz) -#define KMA_RAND_1(sz) .name[KMALLOC_RANDOM_START + 1] = "kmalloc-rnd-01-" #sz, -#define KMA_RAND_2(sz) KMA_RAND_1(sz) .name[KMALLOC_RANDOM_START + 2] = "kmalloc-rnd-02-" #sz, -#define KMA_RAND_3(sz) KMA_RAND_2(sz) .name[KMALLOC_RANDOM_START + 3] = "kmalloc-rnd-03-" #sz, -#define KMA_RAND_4(sz) KMA_RAND_3(sz) .name[KMALLOC_RANDOM_START + 4] = "kmalloc-rnd-04-" #sz, -#define KMA_RAND_5(sz) KMA_RAND_4(sz) .name[KMALLOC_RANDOM_START + 5] = "kmalloc-rnd-05-" #sz, -#define KMA_RAND_6(sz) KMA_RAND_5(sz) .name[KMALLOC_RANDOM_START + 6] = "kmalloc-rnd-06-" #sz, -#define KMA_RAND_7(sz) KMA_RAND_6(sz) .name[KMALLOC_RANDOM_START + 7] = "kmalloc-rnd-07-" #sz, -#define KMA_RAND_8(sz) KMA_RAND_7(sz) .name[KMALLOC_RANDOM_START + 8] = "kmalloc-rnd-08-" #sz, -#define KMA_RAND_9(sz) KMA_RAND_8(sz) .name[KMALLOC_RANDOM_START + 9] = "kmalloc-rnd-09-" #sz, -#define KMA_RAND_10(sz) KMA_RAND_9(sz) .name[KMALLOC_RANDOM_START + 10] = "kmalloc-rnd-10-" #sz, -#define KMA_RAND_11(sz) KMA_RAND_10(sz) .name[KMALLOC_RANDOM_START + 11] = "kmalloc-rnd-11-" #sz, -#define KMA_RAND_12(sz) KMA_RAND_11(sz) .name[KMALLOC_RANDOM_START + 12] = "kmalloc-rnd-12-" #sz, -#define KMA_RAND_13(sz) KMA_RAND_12(sz) .name[KMALLOC_RANDOM_START + 13] = "kmalloc-rnd-13-" #sz, -#define KMA_RAND_14(sz) KMA_RAND_13(sz) .name[KMALLOC_RANDOM_START + 14] = "kmalloc-rnd-14-" #sz, -#define KMA_RAND_15(sz) KMA_RAND_14(sz) .name[KMALLOC_RANDOM_START + 15] = "kmalloc-rnd-15-" #sz, -#else // CONFIG_RANDOM_KMALLOC_CACHES -#define KMALLOC_RANDOM_NAME(N, sz) +#ifdef CONFIG_KMALLOC_PARTITION_CACHES +#define __KMALLOC_PARTITION_CONCAT(a, b) a ## b +#define KMALLOC_PARTITION_NAME(N, sz) __KMALLOC_PARTITION_CONCAT(KMA_PART_, N)(sz) +#define KMA_PART_1(sz) .name[KMALLOC_PARTITION_START + 1] = "kmalloc-part-01-" #sz, +#define KMA_PART_2(sz) KMA_PART_1(sz) .name[KMALLOC_PARTITION_START + 2] = "kmalloc-part-02-" #sz, +#define KMA_PART_3(sz) KMA_PART_2(sz) .name[KMALLOC_PARTITION_START + 3] = "kmalloc-part-03-" #sz, +#define KMA_PART_4(sz) KMA_PART_3(sz) .name[KMALLOC_PARTITION_START + 4] = "kmalloc-part-04-" #sz, +#define KMA_PART_5(sz) KMA_PART_4(sz) .name[KMALLOC_PARTITION_START + 5] = "kmalloc-part-05-" #sz, +#define KMA_PART_6(sz) KMA_PART_5(sz) .name[KMALLOC_PARTITION_START + 6] = "kmalloc-part-06-" #sz, +#define KMA_PART_7(sz) KMA_PART_6(sz) .name[KMALLOC_PARTITION_START + 7] = "kmalloc-part-07-" #sz, +#define KMA_PART_8(sz) KMA_PART_7(sz) .name[KMALLOC_PARTITION_START + 8] = "kmalloc-part-08-" #sz, +#define KMA_PART_9(sz) KMA_PART_8(sz) .name[KMALLOC_PARTITION_START + 9] = "kmalloc-part-09-" #sz, +#define KMA_PART_10(sz) KMA_PART_9(sz) .name[KMALLOC_PARTITION_START + 10] = "kmalloc-part-10-" #sz, +#define KMA_PART_11(sz) KMA_PART_10(sz) .name[KMALLOC_PARTITION_START + 11] = "kmalloc-part-11-" #sz, +#define KMA_PART_12(sz) KMA_PART_11(sz) .name[KMALLOC_PARTITION_START + 12] = "kmalloc-part-12-" #sz, +#define KMA_PART_13(sz) KMA_PART_12(sz) .name[KMALLOC_PARTITION_START + 13] = "kmalloc-part-13-" #sz, +#define KMA_PART_14(sz) KMA_PART_13(sz) .name[KMALLOC_PARTITION_START + 14] = "kmalloc-part-14-" #sz, +#define KMA_PART_15(sz) KMA_PART_14(sz) .name[KMALLOC_PARTITION_START + 15] = "kmalloc-part-15-" #sz, +#else // CONFIG_KMALLOC_PARTITION_CACHES +#define KMALLOC_PARTITION_NAME(N, sz) #endif #define INIT_KMALLOC_INFO(__size, __short_size) \ @@ -849,7 +849,7 @@ EXPORT_SYMBOL(kmalloc_size_roundup); KMALLOC_RCL_NAME(__short_size) \ KMALLOC_CGROUP_NAME(__short_size) \ KMALLOC_DMA_NAME(__short_size) \ - KMALLOC_RANDOM_NAME(RANDOM_KMALLOC_CACHES_NR, __short_size) \ + KMALLOC_PARTITION_NAME(KMALLOC_PARTITION_CACHES_NR, __short_size) \ .size = __size, \ } @@ -961,8 +961,8 @@ new_kmalloc_cache(int idx, enum kmalloc_cache_type type) flags |= SLAB_CACHE_DMA; } -#ifdef CONFIG_RANDOM_KMALLOC_CACHES - if (type >= KMALLOC_RANDOM_START && type <= KMALLOC_RANDOM_END) +#ifdef CONFIG_KMALLOC_PARTITION_CACHES + if (type >= KMALLOC_PARTITION_START && type <= KMALLOC_PARTITION_END) flags |= SLAB_NO_MERGE; #endif @@ -1010,7 +1010,7 @@ void __init create_kmalloc_caches(void) for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++) new_kmalloc_cache(i, type); } -#ifdef CONFIG_RANDOM_KMALLOC_CACHES +#ifdef CONFIG_KMALLOC_PARTITION_RANDOM random_kmalloc_seed = get_random_u64(); #endif diff --git a/mm/slub.c b/mm/slub.c index 161079ac5ba1..ccb208cfbecd 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2129,11 +2129,11 @@ static inline size_t obj_exts_alloc_size(struct kmem_cache *s, if (!is_kmalloc_normal(s)) return sz; - obj_exts_cache = kmalloc_slab(sz, NULL, gfp, 0); + obj_exts_cache = kmalloc_slab(sz, NULL, gfp, __kmalloc_token(0)); /* - * We can't simply compare s with obj_exts_cache, because random kmalloc - * caches have multiple caches per size, selected by caller address. - * Since caller address may differ between kmalloc_slab() and actual + * We can't simply compare s with obj_exts_cache, because partitioned kmalloc + * caches have multiple caches per size, selected by caller address or type. + * Since caller address or type may differ between kmalloc_slab() and actual * allocation, bump size when sizes are equal. */ if (s->object_size == obj_exts_cache->object_size) @@ -5274,7 +5274,7 @@ EXPORT_SYMBOL(__kmalloc_large_node_noprof); static __always_inline void *__do_kmalloc_node(size_t size, kmem_buckets *b, gfp_t flags, int node, - unsigned long caller) + unsigned long caller, kmalloc_token_t token) { struct kmem_cache *s; void *ret; @@ -5289,22 +5289,24 @@ void *__do_kmalloc_node(size_t size, kmem_buckets *b, gfp_t flags, int node, if (unlikely(!size)) return ZERO_SIZE_PTR; - s = kmalloc_slab(size, b, flags, caller); + s = kmalloc_slab(size, b, flags, token); 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(DECL_BUCKET_PARAMS(size, b), gfp_t flags, int node) +void *__kmalloc_node_noprof(DECL_KMALLOC_PARAMS(size, b, token), gfp_t flags, int node) { - return __do_kmalloc_node(size, PASS_BUCKET_PARAM(b), flags, node, _RET_IP_); + return __do_kmalloc_node(size, PASS_BUCKET_PARAM(b), flags, node, + _RET_IP_, PASS_TOKEN_PARAM(token)); } EXPORT_SYMBOL(__kmalloc_node_noprof); -void *__kmalloc_noprof(size_t size, gfp_t flags) +void *__kmalloc_noprof(DECL_KMALLOC_PARAMS(size, b, token), gfp_t flags) { - return __do_kmalloc_node(size, NULL, flags, NUMA_NO_NODE, _RET_IP_); + return __do_kmalloc_node(size, PASS_BUCKET_PARAM(b), flags, + NUMA_NO_NODE, _RET_IP_, PASS_TOKEN_PARAM(token)); } EXPORT_SYMBOL(__kmalloc_noprof); @@ -5319,7 +5321,7 @@ EXPORT_SYMBOL(__kmalloc_noprof); * NULL does not mean EBUSY or EAGAIN. It means ENOMEM. * There is no reason to call it again and expect !NULL. */ -void *kmalloc_nolock_noprof(size_t size, gfp_t gfp_flags, int node) +void *_kmalloc_nolock_noprof(DECL_TOKEN_PARAMS(size, token), gfp_t gfp_flags, int node) { gfp_t alloc_gfp = __GFP_NOWARN | __GFP_NOMEMALLOC | gfp_flags; struct kmem_cache *s; @@ -5342,7 +5344,7 @@ void *kmalloc_nolock_noprof(size_t size, gfp_t gfp_flags, int node) retry: if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) return NULL; - s = kmalloc_slab(size, NULL, alloc_gfp, _RET_IP_); + s = kmalloc_slab(size, NULL, alloc_gfp, PASS_TOKEN_PARAM(token)); if (!(s->flags & __CMPXCHG_DOUBLE) && !kmem_cache_debug(s)) /* @@ -5395,12 +5397,13 @@ void *kmalloc_nolock_noprof(size_t size, gfp_t gfp_flags, int node) ret = kasan_kmalloc(s, ret, size, alloc_gfp); return ret; } -EXPORT_SYMBOL_GPL(kmalloc_nolock_noprof); +EXPORT_SYMBOL_GPL(_kmalloc_nolock_noprof); -void *__kmalloc_node_track_caller_noprof(DECL_BUCKET_PARAMS(size, b), gfp_t flags, +void *__kmalloc_node_track_caller_noprof(DECL_KMALLOC_PARAMS(size, b, token), gfp_t flags, int node, unsigned long caller) { - return __do_kmalloc_node(size, PASS_BUCKET_PARAM(b), flags, node, caller); + return __do_kmalloc_node(size, PASS_BUCKET_PARAM(b), flags, node, + caller, PASS_TOKEN_PARAM(token)); } EXPORT_SYMBOL(__kmalloc_node_track_caller_noprof); @@ -6631,7 +6634,7 @@ void kfree_nolock(const void *object) EXPORT_SYMBOL_GPL(kfree_nolock); static __always_inline __realloc_size(2) void * -__do_krealloc(const void *p, size_t new_size, unsigned long align, gfp_t flags, int nid) +__do_krealloc(const void *p, size_t new_size, unsigned long align, gfp_t flags, int nid, kmalloc_token_t token) { void *ret; size_t ks = 0; @@ -6703,7 +6706,7 @@ __do_krealloc(const void *p, size_t new_size, unsigned long align, gfp_t flags, return (void *)p; alloc_new: - ret = kmalloc_node_track_caller_noprof(new_size, flags, nid, _RET_IP_); + ret = __kmalloc_node_track_caller_noprof(PASS_KMALLOC_PARAMS(new_size, NULL, token), flags, nid, _RET_IP_); if (ret && p) { /* Disable KASAN checks as the object's redzone is accessed. */ kasan_disable_current(); @@ -6752,7 +6755,7 @@ __do_krealloc(const void *p, size_t new_size, unsigned long align, gfp_t flags, * * Return: pointer to the allocated memory or %NULL in case of error */ -void *krealloc_node_align_noprof(const void *p, size_t new_size, unsigned long align, +void *krealloc_node_align_noprof(const void *p, DECL_TOKEN_PARAMS(new_size, token), unsigned long align, gfp_t flags, int nid) { void *ret; @@ -6762,7 +6765,7 @@ void *krealloc_node_align_noprof(const void *p, size_t new_size, unsigned long a return ZERO_SIZE_PTR; } - ret = __do_krealloc(p, new_size, align, flags, nid); + ret = __do_krealloc(p, new_size, align, flags, nid, PASS_TOKEN_PARAM(token)); if (ret && kasan_reset_tag(p) != kasan_reset_tag(ret)) kfree(p); @@ -6799,6 +6802,7 @@ static gfp_t kmalloc_gfp_adjust(gfp_t flags, size_t size) * failure, fall back to non-contiguous (vmalloc) allocation. * @size: size of the request. * @b: which set of kmalloc buckets to allocate from. + * @token: allocation token. * @align: desired alignment. * @flags: gfp mask for the allocation - must be compatible (superset) with GFP_KERNEL. * @node: numa node to allocate from @@ -6815,7 +6819,7 @@ static gfp_t kmalloc_gfp_adjust(gfp_t flags, size_t size) * * Return: pointer to the allocated memory of %NULL in case of failure */ -void *__kvmalloc_node_noprof(DECL_BUCKET_PARAMS(size, b), unsigned long align, +void *__kvmalloc_node_noprof(DECL_KMALLOC_PARAMS(size, b, token), unsigned long align, gfp_t flags, int node) { bool allow_block; @@ -6827,7 +6831,7 @@ void *__kvmalloc_node_noprof(DECL_BUCKET_PARAMS(size, b), unsigned long align, */ ret = __do_kmalloc_node(size, PASS_BUCKET_PARAM(b), kmalloc_gfp_adjust(flags, size), - node, _RET_IP_); + node, _RET_IP_, PASS_TOKEN_PARAM(token)); if (ret || size <= PAGE_SIZE) return ret; @@ -6923,7 +6927,7 @@ EXPORT_SYMBOL(kvfree_sensitive); * * Return: pointer to the allocated memory or %NULL in case of error */ -void *kvrealloc_node_align_noprof(const void *p, size_t size, unsigned long align, +void *kvrealloc_node_align_noprof(const void *p, DECL_TOKEN_PARAMS(size, token), unsigned long align, gfp_t flags, int nid) { void *n; @@ -6931,10 +6935,10 @@ void *kvrealloc_node_align_noprof(const void *p, size_t size, unsigned long alig if (is_vmalloc_addr(p)) return vrealloc_node_align_noprof(p, size, align, flags, nid); - n = krealloc_node_align_noprof(p, size, align, kmalloc_gfp_adjust(flags, size), nid); + n = krealloc_node_align_noprof(p, PASS_TOKEN_PARAMS(size, token), align, kmalloc_gfp_adjust(flags, size), nid); if (!n) { /* We failed to krealloc(), fall back to kvmalloc(). */ - n = kvmalloc_node_align_noprof(size, align, flags, nid); + n = __kvmalloc_node_noprof(PASS_KMALLOC_PARAMS(size, NULL, token), align, flags, nid); if (!n) return NULL; @@ -8449,7 +8453,7 @@ static void __init bootstrap_kmalloc_sheaves(void) { enum kmalloc_cache_type type; - for (type = KMALLOC_NORMAL; type <= KMALLOC_RANDOM_END; type++) { + for (type = KMALLOC_NORMAL; type <= KMALLOC_PARTITION_END; type++) { for (int idx = 0; idx < KMALLOC_SHIFT_HIGH + 1; idx++) { if (kmalloc_caches[type][idx]) bootstrap_cache_sheaves(kmalloc_caches[type][idx]); -- 2.54.0.545.g6539524ca2-goog
