From: andrey.konovalov@linux.dev
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Andrey Konovalov <andreyknvl@gmail.com>,
Marco Elver <elver@google.com>,
Alexander Potapenko <glider@google.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>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Andrey Konovalov <andreyknvl@google.com>
Subject: [PATCH mm v3 14/34] kasan: only define kasan_metadata_size for Generic mode
Date: Mon, 5 Sep 2022 23:05:29 +0200 [thread overview]
Message-ID: <8f81d4938b80446bc72538a08217009f328a3e23.1662411799.git.andreyknvl@google.com> (raw)
In-Reply-To: <cover.1662411799.git.andreyknvl@google.com>
From: Andrey Konovalov <andreyknvl@google.com>
KASAN provides a helper for calculating the size of per-object metadata
stored in the redzone.
As now only the Generic mode uses per-object metadata, only define
kasan_metadata_size() for this mode.
Reviewed-by: Marco Elver <elver@google.com>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
include/linux/kasan.h | 17 ++++++++---------
mm/kasan/common.c | 11 -----------
mm/kasan/generic.c | 11 +++++++++++
3 files changed, 19 insertions(+), 20 deletions(-)
diff --git a/include/linux/kasan.h b/include/linux/kasan.h
index b092277bf48d..027df7599573 100644
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -150,14 +150,6 @@ static __always_inline void kasan_cache_create_kmalloc(struct kmem_cache *cache)
__kasan_cache_create_kmalloc(cache);
}
-size_t __kasan_metadata_size(struct kmem_cache *cache);
-static __always_inline size_t kasan_metadata_size(struct kmem_cache *cache)
-{
- if (kasan_enabled())
- return __kasan_metadata_size(cache);
- return 0;
-}
-
void __kasan_poison_slab(struct slab *slab);
static __always_inline void kasan_poison_slab(struct slab *slab)
{
@@ -282,7 +274,6 @@ static inline void kasan_cache_create(struct kmem_cache *cache,
unsigned int *size,
slab_flags_t *flags) {}
static inline void kasan_cache_create_kmalloc(struct kmem_cache *cache) {}
-static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
static inline void kasan_poison_slab(struct slab *slab) {}
static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
void *object) {}
@@ -333,6 +324,8 @@ static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
#ifdef CONFIG_KASAN_GENERIC
+size_t kasan_metadata_size(struct kmem_cache *cache);
+
void kasan_cache_shrink(struct kmem_cache *cache);
void kasan_cache_shutdown(struct kmem_cache *cache);
void kasan_record_aux_stack(void *ptr);
@@ -340,6 +333,12 @@ void kasan_record_aux_stack_noalloc(void *ptr);
#else /* CONFIG_KASAN_GENERIC */
+/* Tag-based KASAN modes do not use per-object metadata. */
+static inline size_t kasan_metadata_size(struct kmem_cache *cache)
+{
+ return 0;
+}
+
static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
static inline void kasan_record_aux_stack(void *ptr) {}
diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index b6a74fe5e740..7c79c560315d 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -139,17 +139,6 @@ void __kasan_cache_create_kmalloc(struct kmem_cache *cache)
cache->kasan_info.is_kmalloc = true;
}
-size_t __kasan_metadata_size(struct kmem_cache *cache)
-{
- if (!kasan_requires_meta())
- return 0;
- return (cache->kasan_info.alloc_meta_offset ?
- sizeof(struct kasan_alloc_meta) : 0) +
- ((cache->kasan_info.free_meta_offset &&
- cache->kasan_info.free_meta_offset != KASAN_NO_FREE_META) ?
- sizeof(struct kasan_free_meta) : 0);
-}
-
void __kasan_poison_slab(struct slab *slab)
{
struct page *page = slab_page(slab);
diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c
index 5125fad76f70..806ab92032c3 100644
--- a/mm/kasan/generic.c
+++ b/mm/kasan/generic.c
@@ -427,6 +427,17 @@ void kasan_init_object_meta(struct kmem_cache *cache, const void *object)
__memset(alloc_meta, 0, sizeof(*alloc_meta));
}
+size_t kasan_metadata_size(struct kmem_cache *cache)
+{
+ if (!kasan_requires_meta())
+ return 0;
+ return (cache->kasan_info.alloc_meta_offset ?
+ sizeof(struct kasan_alloc_meta) : 0) +
+ ((cache->kasan_info.free_meta_offset &&
+ cache->kasan_info.free_meta_offset != KASAN_NO_FREE_META) ?
+ sizeof(struct kasan_free_meta) : 0);
+}
+
static void __kasan_record_aux_stack(void *addr, bool can_alloc)
{
struct slab *slab = kasan_addr_to_slab(addr);
--
2.25.1
next prev parent reply other threads:[~2022-09-05 21:08 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-05 21:05 [PATCH mm v3 00/34] kasan: switch tag-based modes to stack ring from per-object metadata andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 01/34] kasan: check KASAN_NO_FREE_META in __kasan_metadata_size andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 02/34] kasan: rename kasan_set_*_info to kasan_save_*_info andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 03/34] kasan: move is_kmalloc check out of save_alloc_info andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 04/34] kasan: split save_alloc_info implementations andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 05/34] kasan: drop CONFIG_KASAN_TAGS_IDENTIFY andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 06/34] kasan: introduce kasan_print_aux_stacks andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 07/34] kasan: introduce kasan_get_alloc_track andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 08/34] kasan: introduce kasan_init_object_meta andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 09/34] kasan: clear metadata functions for tag-based modes andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 10/34] kasan: move kasan_get_*_meta to generic.c andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 11/34] kasan: introduce kasan_requires_meta andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 12/34] kasan: introduce kasan_init_cache_meta andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 13/34] kasan: drop CONFIG_KASAN_GENERIC check from kasan_init_cache_meta andrey.konovalov
2022-09-05 21:05 ` andrey.konovalov [this message]
2022-09-05 21:05 ` [PATCH mm v3 15/34] kasan: only define kasan_never_merge for Generic mode andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 16/34] kasan: only define metadata offsets " andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 17/34] kasan: only define metadata structs " andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 18/34] kasan: only define kasan_cache_create " andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 19/34] kasan: pass tagged pointers to kasan_save_alloc/free_info andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 20/34] kasan: move kasan_get_alloc/free_track definitions andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 21/34] kasan: cosmetic changes in report.c andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 22/34] kasan: use virt_addr_valid in kasan_addr_to_page/slab andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 23/34] kasan: use kasan_addr_to_slab in print_address_description andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 24/34] kasan: make kasan_addr_to_page static andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 25/34] kasan: simplify print_report andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 26/34] kasan: introduce complete_report_info andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 27/34] kasan: fill in cache and object in complete_report_info andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 28/34] kasan: rework function arguments in report.c andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 29/34] kasan: introduce kasan_complete_mode_report_info andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 30/34] kasan: implement stack ring for tag-based modes andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 31/34] kasan: support kasan.stacktrace for SW_TAGS andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 32/34] kasan: dynamically allocate stack ring entries andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 33/34] kasan: better identify bug types for tag-based modes andrey.konovalov
2022-09-05 21:05 ` [PATCH mm v3 34/34] kasan: add another use-after-free test andrey.konovalov
2022-09-11 11:50 ` [PATCH mm v3 00/34] kasan: switch tag-based modes to stack ring from per-object metadata Andrey Konovalov
2022-09-12 9:39 ` Marco Elver
2022-09-12 20:06 ` Andrew Morton
2022-09-19 8:07 ` Yu Zhao
2022-09-20 18:59 ` Andrey Konovalov
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