From: Kees Cook <keescook@chromium.org>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: "Kees Cook" <keescook@chromium.org>,
"Andrey Ryabinin" <ryabinin.a.a@gmail.com>,
"Alexander Potapenko" <glider@google.com>,
"Andrey Konovalov" <andreyknvl@gmail.com>,
"Dmitry Vyukov" <dvyukov@google.com>,
"Vincenzo Frascino" <vincenzo.frascino@arm.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
kasan-dev@googlegroups.com, linux-mm@kvack.org, "Ruhl,
Michael J" <michael.j.ruhl@intel.com>,
"Hyeonggon Yoo" <42.hyeyoo@gmail.com>,
"Christoph Lameter" <cl@linux.com>,
"Pekka Enberg" <penberg@kernel.org>,
"David Rientjes" <rientjes@google.com>,
"Joonsoo Kim" <iamjoonsoo.kim@lge.com>,
"David S. Miller" <davem@davemloft.net>,
"Eric Dumazet" <edumazet@google.com>,
"Jakub Kicinski" <kuba@kernel.org>,
"Paolo Abeni" <pabeni@redhat.com>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Nick Desaulniers" <ndesaulniers@google.com>,
"Alex Elder" <elder@kernel.org>,
"Josef Bacik" <josef@toxicpanda.com>,
"David Sterba" <dsterba@suse.com>,
"Sumit Semwal" <sumit.semwal@linaro.org>,
"Christian König" <christian.koenig@amd.com>,
"Jesse Brandeburg" <jesse.brandeburg@intel.com>,
"Daniel Micay" <danielmicay@gmail.com>,
"Yonghong Song" <yhs@fb.com>, "Marco Elver" <elver@google.com>,
"Miguel Ojeda" <ojeda@kernel.org>,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
linux-btrfs@vger.kernel.org, linux-media@vger.kernel.org,
dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org,
linux-fsdevel@vger.kernel.org, intel-wired-lan@lists.osuosl.org,
dev@openvswitch.org, x86@kernel.org, llvm@lists.linux.dev,
linux-hardening@vger.kernel.org
Subject: [PATCH v2 14/16] kasan: Remove ksize()-related tests
Date: Fri, 23 Sep 2022 13:28:20 -0700 [thread overview]
Message-ID: <20220923202822.2667581-15-keescook@chromium.org> (raw)
In-Reply-To: <20220923202822.2667581-1-keescook@chromium.org>
In preparation for no longer unpoisoning in ksize(), remove the behavioral
self-tests for ksize().
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: kasan-dev@googlegroups.com
Cc: linux-mm@kvack.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
lib/test_kasan.c | 42 ------------------------------------------
mm/kasan/shadow.c | 4 +---
2 files changed, 1 insertion(+), 45 deletions(-)
diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index 58c1b01ccfe2..bdd0ced8f8d7 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -753,46 +753,6 @@ static void kasan_global_oob_left(struct kunit *test)
KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p);
}
-/* Check that ksize() makes the whole object accessible. */
-static void ksize_unpoisons_memory(struct kunit *test)
-{
- char *ptr;
- size_t size = 123, real_size;
-
- ptr = kmalloc(size, GFP_KERNEL);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
- real_size = ksize(ptr);
-
- OPTIMIZER_HIDE_VAR(ptr);
-
- /* This access shouldn't trigger a KASAN report. */
- ptr[size] = 'x';
-
- /* This one must. */
- KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[real_size]);
-
- kfree(ptr);
-}
-
-/*
- * Check that a use-after-free is detected by ksize() and via normal accesses
- * after it.
- */
-static void ksize_uaf(struct kunit *test)
-{
- char *ptr;
- int size = 128 - KASAN_GRANULE_SIZE;
-
- ptr = kmalloc(size, GFP_KERNEL);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
- kfree(ptr);
-
- OPTIMIZER_HIDE_VAR(ptr);
- KUNIT_EXPECT_KASAN_FAIL(test, ksize(ptr));
- KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]);
- KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[size]);
-}
-
static void kasan_stack_oob(struct kunit *test)
{
char stack_array[10];
@@ -1392,8 +1352,6 @@ static struct kunit_case kasan_kunit_test_cases[] = {
KUNIT_CASE(kasan_stack_oob),
KUNIT_CASE(kasan_alloca_oob_left),
KUNIT_CASE(kasan_alloca_oob_right),
- KUNIT_CASE(ksize_unpoisons_memory),
- KUNIT_CASE(ksize_uaf),
KUNIT_CASE(kmem_cache_double_free),
KUNIT_CASE(kmem_cache_invalid_free),
KUNIT_CASE(kmem_cache_double_destroy),
diff --git a/mm/kasan/shadow.c b/mm/kasan/shadow.c
index 0e3648b603a6..0895c73e9b69 100644
--- a/mm/kasan/shadow.c
+++ b/mm/kasan/shadow.c
@@ -124,9 +124,7 @@ void kasan_unpoison(const void *addr, size_t size, bool init)
addr = kasan_reset_tag(addr);
/*
- * Skip KFENCE memory if called explicitly outside of sl*b. Also note
- * that calls to ksize(), where size is not a multiple of machine-word
- * size, would otherwise poison the invalid portion of the word.
+ * Skip KFENCE memory if called explicitly outside of sl*b.
*/
if (is_kfence_address(addr))
return;
--
2.34.1
next prev parent reply other threads:[~2022-09-23 20:28 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-23 20:28 [PATCH v2 00/16] slab: Introduce kmalloc_size_roundup() Kees Cook
2022-09-23 20:28 ` [PATCH v2 01/16] slab: Remove __malloc attribute from realloc functions Kees Cook
2022-09-28 7:26 ` Geert Uytterhoeven
2022-09-28 16:27 ` Vlastimil Babka
2022-09-28 17:13 ` Kees Cook
2022-09-28 21:39 ` Vlastimil Babka
2022-09-29 8:36 ` Michael Ellerman
2022-09-29 9:00 ` Geert Uytterhoeven
2022-10-01 16:09 ` Hyeonggon Yoo
2022-09-23 20:28 ` [PATCH v2 02/16] slab: Introduce kmalloc_size_roundup() Kees Cook
2022-09-26 13:15 ` Vlastimil Babka
2022-09-26 17:50 ` Kees Cook
2022-10-01 16:28 ` Hyeonggon Yoo
2022-09-23 20:28 ` [PATCH v2 03/16] skbuff: Proactively round up to kmalloc bucket size Kees Cook
2022-09-24 9:11 ` Kees Cook
2022-09-23 20:28 ` [PATCH v2 05/16] net: ipa: " Kees Cook
2022-09-23 20:28 ` [PATCH v2 06/16] igb: " Kees Cook
2022-09-26 15:49 ` Ruhl, Michael J
2022-09-23 20:28 ` [PATCH v2 07/16] btrfs: send: " Kees Cook
2022-09-23 20:28 ` [PATCH v2 08/16] dma-buf: " Kees Cook
2022-09-26 9:29 ` [Linaro-mm-sig] " Christian König
2022-09-23 20:28 ` [PATCH v2 09/16] coredump: " Kees Cook
2022-09-23 20:28 ` [PATCH v2 10/16] openvswitch: Use kmalloc_size_roundup() to match ksize() usage Kees Cook
2022-09-23 20:28 ` [PATCH v2 11/16] bpf: " Kees Cook
2022-09-23 20:28 ` [PATCH v2 12/16] devres: " Kees Cook
2022-09-23 20:28 ` [PATCH v2 13/16] mempool: " Kees Cook
2022-09-26 13:50 ` Vlastimil Babka
2022-09-26 18:24 ` Kees Cook
2022-09-23 20:28 ` Kees Cook [this message]
2022-09-24 8:15 ` [PATCH v2 14/16] kasan: Remove ksize()-related tests Dmitry Vyukov
2022-09-26 0:38 ` Kees Cook
2022-09-23 20:28 ` [PATCH v2 15/16] mm: Make ksize() a reporting-only function Kees Cook
2022-09-23 20:28 ` [PATCH v2 16/16] slab: Restore __alloc_size attribute to __kmalloc_track_caller Kees Cook
[not found] ` <20220923202822.2667581-5-keescook@chromium.org>
2022-09-25 7:17 ` [PATCH v2 04/16] skbuff: Phase out ksize() fallback for frag_size Paolo Abeni
2022-09-26 0:41 ` Kees Cook
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