linux-kernel - [PATCH 03/32] kasan: move is_kmalloc check out of save_alloc

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Message-Id: <ad7b6cfa3fbe10d2d9c4d15a9d30c2db9a41362c.1655150842.git.andreyknvl@google.com>
Date:   Mon, 13 Jun 2022 22:13:54 +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 03/32] kasan: move is_kmalloc check out of save_alloc_info

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

Move kasan_info.is_kmalloc check out of save_alloc_info().

This is a preparatory change that simplifies the following patches
in this series.

Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
 mm/kasan/common.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 753775b894b6..a6107e8375e0 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -423,15 +423,10 @@ void __kasan_slab_free_mempool(void *ptr, unsigned long ip)
 	}
 }
 
-static void save_alloc_info(struct kmem_cache *cache, void *object,
-				gfp_t flags, bool is_kmalloc)
+static void save_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags)
 {
 	struct kasan_alloc_meta *alloc_meta;
 
-	/* Don't save alloc info for kmalloc caches in kasan_slab_alloc(). */
-	if (cache->kasan_info.is_kmalloc && !is_kmalloc)
-		return;
-
 	alloc_meta = kasan_get_alloc_meta(cache, object);
 	if (alloc_meta)
 		kasan_set_track(&alloc_meta->alloc_track, flags);
@@ -466,8 +461,8 @@ void * __must_check __kasan_slab_alloc(struct kmem_cache *cache,
 	kasan_unpoison(tagged_object, cache->object_size, init);
 
 	/* Save alloc info (if possible) for non-kmalloc() allocations. */
-	if (kasan_stack_collection_enabled())
-		save_alloc_info(cache, (void *)object, flags, false);
+	if (kasan_stack_collection_enabled() && !cache->kasan_info.is_kmalloc)
+		save_alloc_info(cache, (void *)object, flags);
 
 	return tagged_object;
 }
@@ -512,8 +507,8 @@ static inline void *____kasan_kmalloc(struct kmem_cache *cache,
 	 * Save alloc info (if possible) for kmalloc() allocations.
 	 * This also rewrites the alloc info when called from kasan_krealloc().
 	 */
-	if (kasan_stack_collection_enabled())
-		save_alloc_info(cache, (void *)object, flags, true);
+	if (kasan_stack_collection_enabled() && cache->kasan_info.is_kmalloc)
+		save_alloc_info(cache, (void *)object, flags);
 
 	/* Keep the tag that was set by kasan_slab_alloc(). */
 	return (void *)object;
-- 
2.25.1