The patch titled
Subject: kasan: move kasan_get_*_meta to generic.c
has been added to the -mm mm-unstable branch. Its filename is
kasan-move-kasan_get__meta-to-genericc.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kasan-move-kasan_get__meta-to-genericc.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: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Subject: kasan: move kasan_get_*_meta to generic.c
Date: Mon, 5 Sep 2022 23:05:25 +0200
Move the implementations of kasan_get_alloc/free_meta() to generic.c, as
the common KASAN code does not use these functions anymore.
Also drop kasan_reset_tag() from the implementation, as the Generic mode
does not tag pointers.
Link: https://lkml.kernel.org/r/ffcfc0ad654d78a2ef4ca054c943ddb4e5ca477b.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>
---
mm/kasan/common.c | 19 -------------------
mm/kasan/generic.c | 17 +++++++++++++++++
mm/kasan/kasan.h | 14 +++++++-------
3 files changed, 24 insertions(+), 26 deletions(-)
--- a/mm/kasan/common.c~kasan-move-kasan_get__meta-to-genericc
+++ a/mm/kasan/common.c
@@ -229,25 +229,6 @@ size_t __kasan_metadata_size(struct kmem
sizeof(struct kasan_free_meta) : 0);
}
-struct kasan_alloc_meta *kasan_get_alloc_meta(struct kmem_cache *cache,
- const void *object)
-{
- if (!cache->kasan_info.alloc_meta_offset)
- return NULL;
- return kasan_reset_tag(object) + cache->kasan_info.alloc_meta_offset;
-}
-
-#ifdef CONFIG_KASAN_GENERIC
-struct kasan_free_meta *kasan_get_free_meta(struct kmem_cache *cache,
- const void *object)
-{
- BUILD_BUG_ON(sizeof(struct kasan_free_meta) > 32);
- if (cache->kasan_info.free_meta_offset == KASAN_NO_FREE_META)
- return NULL;
- return kasan_reset_tag(object) + cache->kasan_info.free_meta_offset;
-}
-#endif
-
void __kasan_poison_slab(struct slab *slab)
{
struct page *page = slab_page(slab);
--- a/mm/kasan/generic.c~kasan-move-kasan_get__meta-to-genericc
+++ a/mm/kasan/generic.c
@@ -328,6 +328,23 @@ DEFINE_ASAN_SET_SHADOW(f3);
DEFINE_ASAN_SET_SHADOW(f5);
DEFINE_ASAN_SET_SHADOW(f8);
+struct kasan_alloc_meta *kasan_get_alloc_meta(struct kmem_cache *cache,
+ const void *object)
+{
+ if (!cache->kasan_info.alloc_meta_offset)
+ return NULL;
+ return (void *)object + cache->kasan_info.alloc_meta_offset;
+}
+
+struct kasan_free_meta *kasan_get_free_meta(struct kmem_cache *cache,
+ const void *object)
+{
+ BUILD_BUG_ON(sizeof(struct kasan_free_meta) > 32);
+ if (cache->kasan_info.free_meta_offset == KASAN_NO_FREE_META)
+ return NULL;
+ return (void *)object + cache->kasan_info.free_meta_offset;
+}
+
void kasan_init_object_meta(struct kmem_cache *cache, const void *object)
{
struct kasan_alloc_meta *alloc_meta;
--- a/mm/kasan/kasan.h~kasan-move-kasan_get__meta-to-genericc
+++ a/mm/kasan/kasan.h
@@ -209,13 +209,6 @@ struct kunit_kasan_status {
};
#endif
-struct kasan_alloc_meta *kasan_get_alloc_meta(struct kmem_cache *cache,
- const void *object);
-#ifdef CONFIG_KASAN_GENERIC
-struct kasan_free_meta *kasan_get_free_meta(struct kmem_cache *cache,
- const void *object);
-#endif
-
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
@@ -281,6 +274,13 @@ struct slab *kasan_addr_to_slab(const vo
void kasan_init_object_meta(struct kmem_cache *cache, const void *object);
+#ifdef CONFIG_KASAN_GENERIC
+struct kasan_alloc_meta *kasan_get_alloc_meta(struct kmem_cache *cache,
+ const void *object);
+struct kasan_free_meta *kasan_get_free_meta(struct kmem_cache *cache,
+ const void *object);
+#endif
+
depot_stack_handle_t kasan_save_stack(gfp_t flags, bool can_alloc);
void kasan_set_track(struct kasan_track *track, gfp_t flags);
void kasan_save_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags);
_
Patches currently in -mm which might be from andreyknvl@xxxxxxxxxx are
kasan-check-kasan_no_free_meta-in-__kasan_metadata_size.patch
kasan-rename-kasan_set__info-to-kasan_save__info.patch
kasan-move-is_kmalloc-check-out-of-save_alloc_info.patch
kasan-split-save_alloc_info-implementations.patch
kasan-drop-config_kasan_tags_identify.patch
kasan-introduce-kasan_print_aux_stacks.patch
kasan-introduce-kasan_get_alloc_track.patch
kasan-introduce-kasan_init_object_meta.patch
kasan-clear-metadata-functions-for-tag-based-modes.patch
kasan-move-kasan_get__meta-to-genericc.patch
kasan-introduce-kasan_requires_meta.patch
kasan-introduce-kasan_init_cache_meta.patch
kasan-drop-config_kasan_generic-check-from-kasan_init_cache_meta.patch
kasan-only-define-kasan_metadata_size-for-generic-mode.patch
kasan-only-define-kasan_never_merge-for-generic-mode.patch
kasan-only-define-metadata-offsets-for-generic-mode.patch
kasan-only-define-metadata-structs-for-generic-mode.patch
kasan-only-define-kasan_cache_create-for-generic-mode.patch
kasan-pass-tagged-pointers-to-kasan_save_alloc-free_info.patch
kasan-move-kasan_get_alloc-free_track-definitions.patch
kasan-cosmetic-changes-in-reportc.patch
kasan-use-virt_addr_valid-in-kasan_addr_to_page-slab.patch
kasan-use-kasan_addr_to_slab-in-print_address_description.patch
kasan-make-kasan_addr_to_page-static.patch
kasan-simplify-print_report.patch
kasan-introduce-complete_report_info.patch
kasan-fill-in-cache-and-object-in-complete_report_info.patch
kasan-rework-function-arguments-in-reportc.patch
kasan-introduce-kasan_complete_mode_report_info.patch
kasan-implement-stack-ring-for-tag-based-modes.patch
kasan-support-kasanstacktrace-for-sw_tags.patch
kasan-dynamically-allocate-stack-ring-entries.patch
kasan-better-identify-bug-types-for-tag-based-modes.patch
kasan-add-another-use-after-free-test.patch
kasan-move-tests-to-mm-kasan.patch
