linux-kernel - [PATCH 10/32] kasan: move kasan_get_*

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Message-Id: <cb77ebceeb6da2a721989ec2031dac2186f8b7b4.1655150842.git.andreyknvl@google.com>
Date:   Mon, 13 Jun 2022 22:14:01 +0200
From:   andrey.konovalov@...ux.dev
To:     Marco Elver <elver@...gle.com>,
        Alexander Potapenko <glider@...gle.com>
Cc:     Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        kasan-dev@...glegroups.com, Peter Collingbourne <pcc@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Florian Mayer <fmayer@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH 10/32] kasan: move kasan_get_*_meta to generic.c

From: Andrey Konovalov <andreyknvl@...gle.com>

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.

Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
 mm/kasan/common.c  | 19 -------------------
 mm/kasan/generic.c | 17 +++++++++++++++++
 mm/kasan/kasan.h   | 14 +++++++-------
 3 files changed, 24 insertions(+), 26 deletions(-)

diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index f0ee1c1b4b3c..226eaa714da2 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -228,25 +228,6 @@ size_t __kasan_metadata_size(struct kmem_cache *cache)
 		 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);
diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c
index 5462ddbc21e6..fa654cb96a0d 100644
--- a/mm/kasan/generic.c
+++ b/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;
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index 751c3b17749a..ff7a1597aa51 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -208,13 +208,6 @@ 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)
@@ -280,6 +273,13 @@ struct slab *kasan_addr_to_slab(const void *addr);
 
 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);
-- 
2.25.1