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From: Andrey Konovalov <andreyknvl@google.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	Vincenzo Frascino <vincenzo.frascino@arm.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Alexander Potapenko <glider@google.com>,
	Marco Elver <elver@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>,
	Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Branislav Rankov <Branislav.Rankov@arm.com>,
	Kevin Brodsky <kevin.brodsky@arm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	kasan-dev@googlegroups.com, linux-arm-kernel@lists.infradead.org,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	Andrey Konovalov <andreyknvl@google.com>
Subject: [PATCH 13/20] kasan: simplify kasan_poison_kfree
Date: Thu,  5 Nov 2020 01:02:23 +0100	[thread overview]
Message-ID: <d21347b0bdbae6f0afe95b5015fcf9ea8aefb64c.1604534322.git.andreyknvl@google.com> (raw)
In-Reply-To: <cover.1604534322.git.andreyknvl@google.com>

kasan_poison_kfree() is currently only called for mempool allocations
that are backed by either kmem_cache_alloc() or kmalloc(). Therefore, the
page passed to kasan_poison_kfree() is always PageSlab() and there's no
need to do the check. Remove it.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Link: https://linux-review.googlesource.com/id/If31f88726745da8744c6bea96fb32584e6c2778c
---
 mm/kasan/common.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 385863eaec2c..819403548f2e 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -432,16 +432,7 @@ void __kasan_poison_kfree(void *ptr, unsigned long ip)
 	struct page *page;
 
 	page = virt_to_head_page(ptr);
-
-	if (unlikely(!PageSlab(page))) {
-		if (ptr != page_address(page)) {
-			kasan_report_invalid_free(ptr, ip);
-			return;
-		}
-		kasan_poison_memory(ptr, page_size(page), KASAN_FREE_PAGE);
-	} else {
-		____kasan_slab_free(page->slab_cache, ptr, ip, false);
-	}
+	____kasan_slab_free(page->slab_cache, ptr, ip, false);
 }
 
 void __kasan_kfree_large(void *ptr, unsigned long ip)
-- 
2.29.1.341.ge80a0c044ae-goog


WARNING: multiple messages have this Message-ID (diff)
From: Andrey Konovalov <andreyknvl@google.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	 Vincenzo Frascino <vincenzo.frascino@arm.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	 Alexander Potapenko <glider@google.com>,
	Marco Elver <elver@google.com>
Cc: Branislav Rankov <Branislav.Rankov@arm.com>,
	Andrey Konovalov <andreyknvl@google.com>,
	Kevin Brodsky <kevin.brodsky@arm.com>,
	linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com,
	linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org,
	Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Evgenii Stepanov <eugenis@google.com>
Subject: [PATCH 13/20] kasan: simplify kasan_poison_kfree
Date: Thu,  5 Nov 2020 01:02:23 +0100	[thread overview]
Message-ID: <d21347b0bdbae6f0afe95b5015fcf9ea8aefb64c.1604534322.git.andreyknvl@google.com> (raw)
In-Reply-To: <cover.1604534322.git.andreyknvl@google.com>

kasan_poison_kfree() is currently only called for mempool allocations
that are backed by either kmem_cache_alloc() or kmalloc(). Therefore, the
page passed to kasan_poison_kfree() is always PageSlab() and there's no
need to do the check. Remove it.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Link: https://linux-review.googlesource.com/id/If31f88726745da8744c6bea96fb32584e6c2778c
---
 mm/kasan/common.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 385863eaec2c..819403548f2e 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -432,16 +432,7 @@ void __kasan_poison_kfree(void *ptr, unsigned long ip)
 	struct page *page;
 
 	page = virt_to_head_page(ptr);
-
-	if (unlikely(!PageSlab(page))) {
-		if (ptr != page_address(page)) {
-			kasan_report_invalid_free(ptr, ip);
-			return;
-		}
-		kasan_poison_memory(ptr, page_size(page), KASAN_FREE_PAGE);
-	} else {
-		____kasan_slab_free(page->slab_cache, ptr, ip, false);
-	}
+	____kasan_slab_free(page->slab_cache, ptr, ip, false);
 }
 
 void __kasan_kfree_large(void *ptr, unsigned long ip)
-- 
2.29.1.341.ge80a0c044ae-goog


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  parent reply	other threads:[~2020-11-05  0:04 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-05  0:02 [PATCH 00/20] kasan: boot parameters for hardware tag-based mode Andrey Konovalov
2020-11-05  0:02 ` Andrey Konovalov
2020-11-05  0:02 ` [PATCH 01/20] kasan: simplify quarantine_put call site Andrey Konovalov
2020-11-05  0:02   ` Andrey Konovalov
2020-11-05  0:02 ` [PATCH 02/20] kasan: rename get_alloc/free_info Andrey Konovalov
2020-11-05  0:02   ` Andrey Konovalov
2020-11-05  0:02 ` [PATCH 03/20] kasan: introduce set_alloc_info Andrey Konovalov
2020-11-05  0:02   ` Andrey Konovalov
2020-11-05  0:02 ` [PATCH 04/20] kasan, arm64: unpoison stack only with CONFIG_KASAN_STACK Andrey Konovalov
2020-11-05  0:02   ` Andrey Konovalov
2020-11-05  0:02 ` [PATCH 05/20] kasan: allow VMAP_STACK for HW_TAGS mode Andrey Konovalov
2020-11-05  0:02   ` Andrey Konovalov
2020-11-05  0:02 ` [PATCH 06/20] kasan: remove __kasan_unpoison_stack Andrey Konovalov
2020-11-05  0:02   ` Andrey Konovalov
2020-11-05  0:02 ` [PATCH 07/20] kasan: inline kasan_reset_tag for tag-based modes Andrey Konovalov
2020-11-05  0:02   ` Andrey Konovalov
2020-11-05  0:02 ` [PATCH 08/20] kasan: inline random_tag for HW_TAGS Andrey Konovalov
2020-11-05  0:02   ` Andrey Konovalov
2020-11-05  0:02 ` [PATCH 09/20] kasan: inline kasan_poison_memory and check_invalid_free Andrey Konovalov
2020-11-05  0:02   ` Andrey Konovalov
2020-11-05  0:02 ` [PATCH 10/20] kasan: inline and rename kasan_unpoison_memory Andrey Konovalov
2020-11-05  0:02   ` Andrey Konovalov
2020-11-05  0:02 ` [PATCH 11/20] kasan: add and integrate kasan boot parameters Andrey Konovalov
2020-11-05  0:02   ` Andrey Konovalov
2020-11-05  0:02 ` [PATCH 12/20] kasan, mm: check kasan_enabled in annotations Andrey Konovalov
2020-11-05  0:02   ` Andrey Konovalov
2020-11-05  0:02 ` Andrey Konovalov [this message]
2020-11-05  0:02   ` [PATCH 13/20] kasan: simplify kasan_poison_kfree Andrey Konovalov
2020-11-05  0:02 ` [PATCH 14/20] kasan, mm: rename kasan_poison_kfree Andrey Konovalov
2020-11-05  0:02   ` Andrey Konovalov
2020-11-05  0:02 ` [PATCH 15/20] kasan: don't round_up too much Andrey Konovalov
2020-11-05  0:02   ` Andrey Konovalov
2020-11-05  0:02 ` [PATCH 16/20] kasan: simplify assign_tag and set_tag calls Andrey Konovalov
2020-11-05  0:02   ` Andrey Konovalov
2020-11-05  0:02 ` [PATCH 17/20] kasan: clarify comment in __kasan_kfree_large Andrey Konovalov
2020-11-05  0:02   ` Andrey Konovalov
2020-11-05  0:02 ` [PATCH 18/20] kasan: clean up metadata allocation and usage Andrey Konovalov
2020-11-05  0:02   ` Andrey Konovalov
2020-11-05  0:02 ` [PATCH 19/20] kasan, mm: allow cache merging with no metadata Andrey Konovalov
2020-11-05  0:02   ` Andrey Konovalov
2020-11-05  0:02 ` [PATCH 20/20] kasan: update documentation Andrey Konovalov
2020-11-05  0:02   ` Andrey Konovalov
2020-11-05 20:49 ` [PATCH 00/20] kasan: boot parameters for hardware tag-based mode Evgenii Stepanov
2020-11-05 20:49   ` Evgenii Stepanov
2020-11-05 20:49   ` Evgenii Stepanov
2020-11-05 20:55   ` Andrey Konovalov
2020-11-05 20:55     ` Andrey Konovalov
2020-11-05 20:55     ` Andrey Konovalov
2020-11-05 22:19     ` Evgenii Stepanov
2020-11-05 22:19       ` Evgenii Stepanov
2020-11-05 22:19       ` Evgenii Stepanov

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