[PATCH v3 2/6] mm/slab: Plumb kmem_buckets into __do_kmalloc_node()

Kees Cook
2024-04-24T21:41:09Z

To be able to choose which buckets to allocate from, make the buckets
available to the lower level kmalloc interfaces by adding them as the
first argument. Where the bucket is not available, pass NULL, which means
"use the default system kmalloc bucket set" (the prior existing behavior),
as implemented in kmalloc_slab().

Signed-off-by: Kees Cook <keescook@chromium.org>
---
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: linux-mm@kvack.org
Cc: linux-hardening@vger.kernel.org
---
include/linux/slab.h | 16 ++++++++--------
lib/fortify_kunit.c | 2 +-
mm/slab.h | 6 ++++--
mm/slab_common.c | 4 ++--
mm/slub.c | 14 +++++++-------
mm/util.c | 2 +-
6 files changed, 23 insertions(+), 21 deletions(-)

diff --git a/include/linux/slab.h b/include/linux/slab.h
index c8164d5db420..07373b680894 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -569,8 +569,8 @@ static __always_inline void kfree_bulk(size_t size, void **p)
kmem_cache_free_bulk(NULL, size, p);
}

-void *__kmalloc_node_noprof(size_t size, gfp_t flags, int node) __assume_kmalloc_alignment
- __alloc_size(1);
+void *__kmalloc_node_noprof(kmem_buckets *b, size_t size, gfp_t flags, int node)
+ __assume_kmalloc_alignment __alloc_size(2);
#define __kmalloc_node(...) alloc_hooks(__kmalloc_node_noprof(__VA_ARGS__))

void *kmem_cache_alloc_node_noprof(struct kmem_cache *s, gfp_t flags,
@@ -679,7 +679,7 @@ static __always_inline __alloc_size(1) void *kmalloc_node_noprof(size_t size, gf
kmalloc_caches[kmalloc_type(flags, _RET_IP_)][index],
flags, node, size);
}
- return __kmalloc_node_noprof(size, flags, node);
+ return __kmalloc_node_noprof(NULL, size, flags, node);
}
#define kmalloc_node(...) alloc_hooks(kmalloc_node_noprof(__VA_ARGS__))

@@ -730,10 +730,10 @@ 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(size_t size, gfp_t flags, int node,
- unsigned long caller) __alloc_size(1);
+void *kmalloc_node_track_caller_noprof(kmem_buckets *b, size_t size, gfp_t flags, int node,
+ unsigned long caller) __alloc_size(2);
#define kmalloc_node_track_caller(...) \
- alloc_hooks(kmalloc_node_track_caller_noprof(__VA_ARGS__, _RET_IP_))
+ alloc_hooks(kmalloc_node_track_caller_noprof(NULL, __VA_ARGS__, _RET_IP_))

/*
* kmalloc_track_caller is a special version of kmalloc that records the
@@ -746,7 +746,7 @@ void *kmalloc_node_track_caller_noprof(size_t size, gfp_t flags, int node,
#define kmalloc_track_caller(...) kmalloc_node_track_caller(__VA_ARGS__, NUMA_NO_NODE)

#define kmalloc_track_caller_noprof(...) \
- kmalloc_node_track_caller_noprof(__VA_ARGS__, NUMA_NO_NODE, _RET_IP_)
+ kmalloc_node_track_caller_noprof(NULL, __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)
@@ -757,7 +757,7 @@ static inline __alloc_size(1, 2) void *kmalloc_array_node_noprof(size_t n, size_
return NULL;
if (__builtin_constant_p(n) && __builtin_constant_p(size))
return kmalloc_node_noprof(bytes, flags, node);
- return __kmalloc_node_noprof(bytes, flags, node);
+ return __kmalloc_node_noprof(NULL, bytes, flags, node);
}
#define kmalloc_array_node(...) alloc_hooks(kmalloc_array_node_noprof(__VA_ARGS__))

diff --git a/lib/fortify_kunit.c b/lib/fortify_kunit.c
index 493ec02dd5b3..ff059d88d455 100644
--- a/lib/fortify_kunit.c
+++ b/lib/fortify_kunit.c
@@ -220,7 +220,7 @@ static void alloc_size_##allocator##_dynamic_test(struct kunit *test) \
checker(expected_size, __kmalloc(alloc_size, gfp), \
kfree(p)); \
checker(expected_size, \
- __kmalloc_node(alloc_size, gfp, NUMA_NO_NODE), \
+ __kmalloc_node(NULL, alloc_size, gfp, NUMA_NO_NODE), \
kfree(p)); \
\
orig = kmalloc(alloc_size, gfp); \
diff --git a/mm/slab.h b/mm/slab.h
index 5f8f47c5bee0..f459cd338852 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -403,16 +403,18 @@ 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(kmem_buckets *b, size_t size, 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);
diff --git a/mm/slab_common.c b/mm/slab_common.c
index db9e1b15efd5..7cb4e8fd1275 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -702,7 +702,7 @@ 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(NULL, size, GFP_KERNEL, 0)->object_size;
}

/* Above the smaller buckets, size is a multiple of page size. */
@@ -1186,7 +1186,7 @@ __do_krealloc(const void *p, size_t new_size, gfp_t flags)
return (void *)p;
}

- ret = kmalloc_node_track_caller_noprof(new_size, flags, NUMA_NO_NODE, _RET_IP_);
+ ret = kmalloc_node_track_caller_noprof(NULL, new_size, flags, NUMA_NO_NODE, _RET_IP_);
if (ret && p) {
/* Disable KASAN checks as the object's redzone is accessed. */
kasan_disable_current();
diff --git a/mm/slub.c b/mm/slub.c
index 23bc0d236c26..a94a0507e19c 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4093,7 +4093,7 @@ void *kmalloc_large_node_noprof(size_t size, gfp_t flags, int node)
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(kmem_buckets *b, size_t size, gfp_t flags, int node,
unsigned long caller)
{
struct kmem_cache *s;
@@ -4109,7 +4109,7 @@ 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(b, size, flags, caller);

ret = slab_alloc_node(s, NULL, flags, node, caller, size);
ret = kasan_kmalloc(s, ret, size, flags);
@@ -4117,22 +4117,22 @@ void *__do_kmalloc_node(size_t size, gfp_t flags, int node,
return ret;
}

-void *__kmalloc_node_noprof(size_t size, gfp_t flags, int node)
+void *__kmalloc_node_noprof(kmem_buckets *b, size_t size, gfp_t flags, int node)
{
- return __do_kmalloc_node(size, flags, node, _RET_IP_);
+ return __do_kmalloc_node(b, size, 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(NULL, size, 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(kmem_buckets *b, size_t size, gfp_t flags,
int node, unsigned long caller)
{
- return __do_kmalloc_node(size, flags, node, caller);
+ return __do_kmalloc_node(b, size, flags, node, caller);
}
EXPORT_SYMBOL(kmalloc_node_track_caller_noprof);

diff --git a/mm/util.c b/mm/util.c
index c9e519e6811f..80430e5ba981 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -128,7 +128,7 @@ void *kmemdup_noprof(const void *src, size_t len, gfp_t gfp)
{
void *p;

- p = kmalloc_node_track_caller_noprof(len, gfp, NUMA_NO_NODE, _RET_IP_);
+ p = kmalloc_node_track_caller_noprof(NULL, len, gfp, NUMA_NO_NODE, _RET_IP_);
if (p)
memcpy(p, src, len);
return p;
--
2.34.1