The patch titled
Subject: kasan: pass tagged pointers to kasan_save_alloc/free_info
has been added to the -mm mm-unstable branch. Its filename is
kasan-pass-tagged-pointers-to-kasan_save_alloc-free_info.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kasan-pass-tagged-pointers-to-kasan_save_alloc-free_info.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: pass tagged pointers to kasan_save_alloc/free_info
Date: Mon, 5 Sep 2022 23:05:34 +0200
Pass tagged pointers to kasan_save_alloc/free_info().
This is a preparatory patch to simplify other changes in the series.
Link: https://lkml.kernel.org/r/d5bc48cfcf0dca8269dc3ed863047e4d4d2030f1.1662411799.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 | 6 ++----
mm/kasan/generic.c | 3 +--
mm/kasan/kasan.h | 2 +-
mm/kasan/tags.c | 3 +--
4 files changed, 5 insertions(+), 9 deletions(-)
--- a/mm/kasan/common.c~kasan-pass-tagged-pointers-to-kasan_save_alloc-free_info
+++ a/mm/kasan/common.c
@@ -193,13 +193,11 @@ void * __must_check __kasan_init_slab_ob
static inline bool ____kasan_slab_free(struct kmem_cache *cache, void *object,
unsigned long ip, bool quarantine, bool init)
{
- u8 tag;
void *tagged_object;
if (!kasan_arch_is_ready())
return false;
- tag = get_tag(object);
tagged_object = object;
object = kasan_reset_tag(object);
@@ -228,7 +226,7 @@ static inline bool ____kasan_slab_free(s
return false;
if (kasan_stack_collection_enabled())
- kasan_save_free_info(cache, object, tag);
+ kasan_save_free_info(cache, tagged_object);
return kasan_quarantine_put(cache, object);
}
@@ -317,7 +315,7 @@ void * __must_check __kasan_slab_alloc(s
/* Save alloc info (if possible) for non-kmalloc() allocations. */
if (kasan_stack_collection_enabled() && !cache->kasan_info.is_kmalloc)
- kasan_save_alloc_info(cache, (void *)object, flags);
+ kasan_save_alloc_info(cache, tagged_object, flags);
return tagged_object;
}
--- a/mm/kasan/generic.c~kasan-pass-tagged-pointers-to-kasan_save_alloc-free_info
+++ a/mm/kasan/generic.c
@@ -500,8 +500,7 @@ void kasan_save_alloc_info(struct kmem_c
kasan_set_track(&alloc_meta->alloc_track, flags);
}
-void kasan_save_free_info(struct kmem_cache *cache,
- void *object, u8 tag)
+void kasan_save_free_info(struct kmem_cache *cache, void *object)
{
struct kasan_free_meta *free_meta;
--- a/mm/kasan/kasan.h~kasan-pass-tagged-pointers-to-kasan_save_alloc-free_info
+++ a/mm/kasan/kasan.h
@@ -309,7 +309,7 @@ static inline void kasan_init_object_met
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);
-void kasan_save_free_info(struct kmem_cache *cache, void *object, u8 tag);
+void kasan_save_free_info(struct kmem_cache *cache, void *object);
struct kasan_track *kasan_get_alloc_track(struct kmem_cache *cache,
void *object);
struct kasan_track *kasan_get_free_track(struct kmem_cache *cache,
--- a/mm/kasan/tags.c~kasan-pass-tagged-pointers-to-kasan_save_alloc-free_info
+++ a/mm/kasan/tags.c
@@ -21,8 +21,7 @@ void kasan_save_alloc_info(struct kmem_c
{
}
-void kasan_save_free_info(struct kmem_cache *cache,
- void *object, u8 tag)
+void kasan_save_free_info(struct kmem_cache *cache, void *object)
{
}
_
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
