The quilt patch titled
Subject: kasan: only define kasan_never_merge for Generic mode
has been removed from the -mm tree. Its filename was
kasan-only-define-kasan_never_merge-for-generic-mode.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Subject: kasan: only define kasan_never_merge for Generic mode
Date: Mon, 5 Sep 2022 23:05:30 +0200
KASAN prevents merging of slab caches whose objects have per-object
metadata stored in redzones.
As now only the Generic mode uses per-object metadata, define
kasan_never_merge() only for this mode.
Link: https://lkml.kernel.org/r/81ed01f29ff3443580b7e2fe362a8b47b1e8006d.1662411799.git.andreyknvl@xxxxxxxxxx
Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Reviewed-by: Marco Elver <elver@xxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Evgenii Stepanov <eugenis@xxxxxxxxxx>
Cc: Peter Collingbourne <pcc@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/kasan.h | 18 ++++++------------
mm/kasan/common.c | 8 --------
mm/kasan/generic.c | 8 ++++++++
3 files changed, 14 insertions(+), 20 deletions(-)
--- a/include/linux/kasan.h~kasan-only-define-kasan_never_merge-for-generic-mode
+++ a/include/linux/kasan.h
@@ -103,14 +103,6 @@ struct kasan_cache {
bool is_kmalloc;
};
-slab_flags_t __kasan_never_merge(void);
-static __always_inline slab_flags_t kasan_never_merge(void)
-{
- if (kasan_enabled())
- return __kasan_never_merge();
- return 0;
-}
-
void __kasan_unpoison_range(const void *addr, size_t size);
static __always_inline void kasan_unpoison_range(const void *addr, size_t size)
{
@@ -261,10 +253,6 @@ static __always_inline bool kasan_check_
#else /* CONFIG_KASAN */
-static inline slab_flags_t kasan_never_merge(void)
-{
- return 0;
-}
static inline void kasan_unpoison_range(const void *address, size_t size) {}
static inline void kasan_poison_pages(struct page *page, unsigned int order,
bool init) {}
@@ -325,6 +313,7 @@ static inline void kasan_unpoison_task_s
#ifdef CONFIG_KASAN_GENERIC
size_t kasan_metadata_size(struct kmem_cache *cache);
+slab_flags_t kasan_never_merge(void);
void kasan_cache_shrink(struct kmem_cache *cache);
void kasan_cache_shutdown(struct kmem_cache *cache);
@@ -338,6 +327,11 @@ static inline size_t kasan_metadata_size
{
return 0;
}
+/* And thus nothing prevents cache merging. */
+static inline slab_flags_t kasan_never_merge(void)
+{
+ return 0;
+}
static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
--- a/mm/kasan/common.c~kasan-only-define-kasan_never_merge-for-generic-mode
+++ a/mm/kasan/common.c
@@ -88,14 +88,6 @@ asmlinkage void kasan_unpoison_task_stac
}
#endif /* CONFIG_KASAN_STACK */
-/* Only allow cache merging when no per-object metadata is present. */
-slab_flags_t __kasan_never_merge(void)
-{
- if (kasan_requires_meta())
- return SLAB_KASAN;
- return 0;
-}
-
void __kasan_unpoison_pages(struct page *page, unsigned int order, bool init)
{
u8 tag;
--- a/mm/kasan/generic.c~kasan-only-define-kasan_never_merge-for-generic-mode
+++ a/mm/kasan/generic.c
@@ -328,6 +328,14 @@ DEFINE_ASAN_SET_SHADOW(f3);
DEFINE_ASAN_SET_SHADOW(f5);
DEFINE_ASAN_SET_SHADOW(f8);
+/* Only allow cache merging when no per-object metadata is present. */
+slab_flags_t kasan_never_merge(void)
+{
+ if (!kasan_requires_meta())
+ return 0;
+ return SLAB_KASAN;
+}
+
/*
* Adaptive redzone policy taken from the userspace AddressSanitizer runtime.
* For larger allocations larger redzones are used.
_
Patches currently in -mm which might be from andreyknvl@xxxxxxxxxx are
kasan-fix-array-bounds-warnings-in-tests.patch
