The patch titled
Subject: kasan: prevent compiler from optimizing away memset in tests
has been added to the -mm tree. Its filename is
kasan-disallow-compiler-to-optimize-away-memset-in-tests.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/kasan-disallow-compiler-to-optimize-away-memset-in-tests.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/kasan-disallow-compiler-to-optimize-away-memset-in-tests.patch
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------------------------------------------------------
From: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Subject: kasan: prevent compiler from optimizing away memset in tests
A compiler can optimize away memset calls by replacing them with mov
instructions. There are KASAN tests that specifically test that KASAN
correctly handles memset calls so we don't want this optimization to
happen.
The solution is to add -fno-builtin flag to test_kasan.ko
Link: http://lkml.kernel.org/r/105ec9a308b2abedb1a0d1fdced0c22d765e4732.1519924383.git.andreyknvl@xxxxxxxxxx
Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: Nick Terrell <terrelln@xxxxxx>
Cc: Chris Mason <clm@xxxxxx>
Cc: Yury Norov <ynorov@xxxxxxxxxxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: "Luis R . Rodriguez" <mcgrof@xxxxxxxxxx>
Cc: Palmer Dabbelt <palmer@xxxxxxxxxxx>
Cc: "Paul E . McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Jeff Layton <jlayton@xxxxxxxxxx>
Cc: "Jason A . Donenfeld" <Jason@xxxxxxxxx>
Cc: Kostya Serebryany <kcc@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/Makefile | 1 +
1 file changed, 1 insertion(+)
diff -puN lib/Makefile~kasan-disallow-compiler-to-optimize-away-memset-in-tests lib/Makefile
--- a/lib/Makefile~kasan-disallow-compiler-to-optimize-away-memset-in-tests
+++ a/lib/Makefile
@@ -52,6 +52,7 @@ obj-$(CONFIG_TEST_FIRMWARE) += test_firm
obj-$(CONFIG_TEST_SYSCTL) += test_sysctl.o
obj-$(CONFIG_TEST_HASH) += test_hash.o test_siphash.o
obj-$(CONFIG_TEST_KASAN) += test_kasan.o
+CFLAGS_test_kasan.o += -fno-builtin
obj-$(CONFIG_TEST_KSTRTOX) += test-kstrtox.o
obj-$(CONFIG_TEST_LIST_SORT) += test_list_sort.o
obj-$(CONFIG_TEST_LKM) += test_module.o
_
Patches currently in -mm which might be from andreyknvl@xxxxxxxxxx are
kasan-slub-fix-handling-of-kasan_slab_free-hook.patch
kasan-fix-invalid-free-test-crashing-the-kernel.patch
kasan-disallow-compiler-to-optimize-away-memset-in-tests.patch
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