The patch titled
Subject: mm/kasan: simplify and refine kasan_cache code
has been added to the -mm mm-unstable branch. Its filename is
mm-kasan-simplify-and-refine-kasan_cache-code.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-kasan-simplify-and-refine-kasan_cache-code.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Feng Tang <feng.tang@xxxxxxxxx>
Subject: mm/kasan: simplify and refine kasan_cache code
Date: Wed, 4 Jan 2023 14:06:05 +0800
struct 'kasan_cache' has a member 'is_kmalloc' indicating whether its host
kmem_cache is a kmalloc cache. With newly introduced is_kmalloc_cache()
helper, 'is_kmalloc' and its related function can be replaced and removed.
Also 'kasan_cache' is only needed by KASAN generic mode, and not by SW/HW
tag modes, so refine its protection macro accordingly, suggested by Andrey
Konoval.
Link: https://lkml.kernel.org/r/20230104060605.930910-2-feng.tang@xxxxxxxxx
Signed-off-by: Feng Tang <feng.tang@xxxxxxxxx>
Reviewed-by: Andrey Konovalov <andreyknvl@xxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Cc: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/kasan.h | 22 +++++-----------------
include/linux/slab_def.h | 2 +-
include/linux/slub_def.h | 2 +-
mm/kasan/common.c | 9 ++-------
mm/slab_common.c | 1 -
5 files changed, 9 insertions(+), 27 deletions(-)
--- a/include/linux/kasan.h~mm-kasan-simplify-and-refine-kasan_cache-code
+++ a/include/linux/kasan.h
@@ -96,15 +96,6 @@ static inline bool kasan_has_integrated_
}
#ifdef CONFIG_KASAN
-
-struct kasan_cache {
-#ifdef CONFIG_KASAN_GENERIC
- int alloc_meta_offset;
- int free_meta_offset;
-#endif
- bool is_kmalloc;
-};
-
void __kasan_unpoison_range(const void *addr, size_t size);
static __always_inline void kasan_unpoison_range(const void *addr, size_t size)
{
@@ -129,13 +120,6 @@ static __always_inline bool kasan_unpois
return false;
}
-void __kasan_cache_create_kmalloc(struct kmem_cache *cache);
-static __always_inline void kasan_cache_create_kmalloc(struct kmem_cache *cache)
-{
- if (kasan_enabled())
- __kasan_cache_create_kmalloc(cache);
-}
-
void __kasan_poison_slab(struct slab *slab);
static __always_inline void kasan_poison_slab(struct slab *slab)
{
@@ -255,7 +239,6 @@ static inline bool kasan_unpoison_pages(
{
return false;
}
-static inline void kasan_cache_create_kmalloc(struct kmem_cache *cache) {}
static inline void kasan_poison_slab(struct slab *slab) {}
static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
void *object) {}
@@ -306,6 +289,11 @@ static inline void kasan_unpoison_task_s
#ifdef CONFIG_KASAN_GENERIC
+struct kasan_cache {
+ int alloc_meta_offset;
+ int free_meta_offset;
+};
+
size_t kasan_metadata_size(struct kmem_cache *cache, bool in_object);
slab_flags_t kasan_never_merge(void);
void kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
--- a/include/linux/slab_def.h~mm-kasan-simplify-and-refine-kasan_cache-code
+++ a/include/linux/slab_def.h
@@ -72,7 +72,7 @@ struct kmem_cache {
int obj_offset;
#endif /* CONFIG_DEBUG_SLAB */
-#ifdef CONFIG_KASAN
+#ifdef CONFIG_KASAN_GENERIC
struct kasan_cache kasan_info;
#endif
--- a/include/linux/slub_def.h~mm-kasan-simplify-and-refine-kasan_cache-code
+++ a/include/linux/slub_def.h
@@ -136,7 +136,7 @@ struct kmem_cache {
unsigned int *random_seq;
#endif
-#ifdef CONFIG_KASAN
+#ifdef CONFIG_KASAN_GENERIC
struct kasan_cache kasan_info;
#endif
--- a/mm/kasan/common.c~mm-kasan-simplify-and-refine-kasan_cache-code
+++ a/mm/kasan/common.c
@@ -122,11 +122,6 @@ void __kasan_poison_pages(struct page *p
KASAN_PAGE_FREE, init);
}
-void __kasan_cache_create_kmalloc(struct kmem_cache *cache)
-{
- cache->kasan_info.is_kmalloc = true;
-}
-
void __kasan_poison_slab(struct slab *slab)
{
struct page *page = slab_page(slab);
@@ -326,7 +321,7 @@ void * __must_check __kasan_slab_alloc(s
kasan_unpoison(tagged_object, cache->object_size, init);
/* Save alloc info (if possible) for non-kmalloc() allocations. */
- if (kasan_stack_collection_enabled() && !cache->kasan_info.is_kmalloc)
+ if (kasan_stack_collection_enabled() && !is_kmalloc_cache(cache))
kasan_save_alloc_info(cache, tagged_object, flags);
return tagged_object;
@@ -372,7 +367,7 @@ static inline void *____kasan_kmalloc(st
* Save alloc info (if possible) for kmalloc() allocations.
* This also rewrites the alloc info when called from kasan_krealloc().
*/
- if (kasan_stack_collection_enabled() && cache->kasan_info.is_kmalloc)
+ if (kasan_stack_collection_enabled() && is_kmalloc_cache(cache))
kasan_save_alloc_info(cache, (void *)object, flags);
/* Keep the tag that was set by kasan_slab_alloc(). */
--- a/mm/slab_common.c~mm-kasan-simplify-and-refine-kasan_cache-code
+++ a/mm/slab_common.c
@@ -670,7 +670,6 @@ struct kmem_cache *__init create_kmalloc
create_boot_cache(s, name, size, flags | SLAB_KMALLOC, useroffset,
usersize);
- kasan_cache_create_kmalloc(s);
list_add(&s->list, &slab_caches);
s->refcount = 1;
return s;
_
Patches currently in -mm which might be from feng.tang@xxxxxxxxx are
mm-slab-add-is_kmalloc_cache-helper-function.patch
mm-kasan-simplify-and-refine-kasan_cache-code.patch
