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From: andrey.konovalov@linux.dev
To: Marco Elver <elver@google.com>, Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Andrey Ryabinin <ryabinin.a.a@gmail.com>,
	kasan-dev@googlegroups.com, Peter Collingbourne <pcc@google.com>,
	Evgenii Stepanov <eugenis@google.com>,
	Florian Mayer <fmayer@google.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	Andrey Konovalov <andreyknvl@google.com>
Subject: [PATCH mm v2 15/33] kasan: only define kasan_never_merge for Generic mode
Date: Tue, 19 Jul 2022 02:09:55 +0200	[thread overview]
Message-ID: <8ae180159c3789ca75bc69857958c31d25ea96ee.1658189199.git.andreyknvl@google.com> (raw)
In-Reply-To: <cover.1658189199.git.andreyknvl@google.com>

From: Andrey Konovalov <andreyknvl@google.com>

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.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
 include/linux/kasan.h | 18 ++++++------------
 mm/kasan/common.c     |  8 --------
 mm/kasan/generic.c    |  8 ++++++++
 3 files changed, 14 insertions(+), 20 deletions(-)

diff --git a/include/linux/kasan.h b/include/linux/kasan.h
index 027df7599573..9743d4b3a918 100644
--- a/include/linux/kasan.h
+++ b/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_byte(const void *addr)
 
 #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_stack(struct task_struct *task) {}
 #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(struct kmem_cache *cache)
 {
 	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) {}
diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 0cef41f8a60d..e4ff0e4e7a9d 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -88,14 +88,6 @@ asmlinkage void kasan_unpoison_task_stack_below(const void *watermark)
 }
 #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;
diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c
index 806ab92032c3..25333bf3c99f 100644
--- a/mm/kasan/generic.c
+++ b/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.
-- 
2.25.1



  parent reply	other threads:[~2022-07-19  0:12 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-07-19  0:09 [PATCH mm v2 00/33] kasan: switch tag-based modes to stack ring from per-object metadata andrey.konovalov
2022-07-19  0:09 ` [PATCH mm v2 01/33] kasan: check KASAN_NO_FREE_META in __kasan_metadata_size andrey.konovalov
2022-07-19  0:09 ` [PATCH mm v2 02/33] kasan: rename kasan_set_*_info to kasan_save_*_info andrey.konovalov
2022-07-19  0:09 ` [PATCH mm v2 03/33] kasan: move is_kmalloc check out of save_alloc_info andrey.konovalov
2022-07-19  0:09 ` [PATCH mm v2 04/33] kasan: split save_alloc_info implementations andrey.konovalov
2022-07-19  0:09 ` [PATCH mm v2 05/33] kasan: drop CONFIG_KASAN_TAGS_IDENTIFY andrey.konovalov
2022-07-19  0:09 ` [PATCH mm v2 06/33] kasan: introduce kasan_print_aux_stacks andrey.konovalov
2022-07-19  0:09 ` [PATCH mm v2 07/33] kasan: introduce kasan_get_alloc_track andrey.konovalov
2022-07-19  0:09 ` [PATCH mm v2 08/33] kasan: introduce kasan_init_object_meta andrey.konovalov
2022-07-19  0:09 ` [PATCH mm v2 09/33] kasan: clear metadata functions for tag-based modes andrey.konovalov
2022-07-19  0:09 ` [PATCH mm v2 10/33] kasan: move kasan_get_*_meta to generic.c andrey.konovalov
2022-07-19  0:09 ` [PATCH mm v2 11/33] kasan: introduce kasan_requires_meta andrey.konovalov
2022-07-19  0:09 ` [PATCH mm v2 12/33] kasan: introduce kasan_init_cache_meta andrey.konovalov
2022-07-19  0:09 ` [PATCH mm v2 13/33] kasan: drop CONFIG_KASAN_GENERIC check from kasan_init_cache_meta andrey.konovalov
2022-07-19  0:09 ` [PATCH mm v2 14/33] kasan: only define kasan_metadata_size for Generic mode andrey.konovalov
2022-07-19  0:09 ` andrey.konovalov [this message]
2022-07-19  0:09 ` [PATCH mm v2 16/33] kasan: only define metadata offsets " andrey.konovalov
2022-07-19  0:09 ` [PATCH mm v2 17/33] kasan: only define metadata structs " andrey.konovalov
2022-07-19  0:09 ` [PATCH mm v2 18/33] kasan: only define kasan_cache_create " andrey.konovalov
2022-07-19  0:09 ` [PATCH mm v2 19/33] kasan: pass tagged pointers to kasan_save_alloc/free_info andrey.konovalov
2022-07-19  0:10 ` [PATCH mm v2 20/33] kasan: move kasan_get_alloc/free_track definitions andrey.konovalov
2022-07-19  0:10 ` [PATCH mm v2 21/33] kasan: cosmetic changes in report.c andrey.konovalov
2022-07-19  0:10 ` [PATCH mm v2 22/33] kasan: use virt_addr_valid in kasan_addr_to_page/slab andrey.konovalov
2022-07-19  0:10 ` [PATCH mm v2 23/33] kasan: use kasan_addr_to_slab in print_address_description andrey.konovalov
2022-07-19  0:10 ` [PATCH mm v2 24/33] kasan: make kasan_addr_to_page static andrey.konovalov
2022-07-19  0:10 ` [PATCH mm v2 25/33] kasan: simplify print_report andrey.konovalov
2022-07-19  0:10 ` [PATCH mm v2 26/33] kasan: introduce complete_report_info andrey.konovalov
2022-07-19  0:10 ` [PATCH mm v2 27/33] kasan: fill in cache and object in complete_report_info andrey.konovalov
2022-07-19  0:10 ` [PATCH mm v2 28/33] kasan: rework function arguments in report.c andrey.konovalov
2022-07-19  0:10 ` [PATCH mm v2 29/33] kasan: introduce kasan_complete_mode_report_info andrey.konovalov
2022-07-19  0:10 ` [PATCH mm v2 30/33] kasan: implement stack ring for tag-based modes andrey.konovalov
2022-07-19 11:41   ` Marco Elver
2022-07-21 20:41     ` Andrey Konovalov
2022-08-02 20:45       ` Andrey Konovalov
2022-08-03 20:28         ` Marco Elver
2022-09-05 20:40           ` Andrey Konovalov
2022-07-19  0:10 ` [PATCH mm v2 31/33] kasan: support kasan.stacktrace for SW_TAGS andrey.konovalov
2022-07-19  0:10 ` [PATCH mm v2 32/33] kasan: dynamically allocate stack ring entries andrey.konovalov
2022-08-03 20:09   ` Marco Elver
2022-09-05 20:34     ` Andrey Konovalov
2022-07-19  0:10 ` [PATCH mm v2 33/33] kasan: better identify bug types for tag-based modes andrey.konovalov

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