summaryrefslogtreecommitdiffstats
path: root/lib/Makefile
diff options
context:
space:
mode:
authorAndrey Konovalov2018-04-11 01:30:39 +0200
committerLinus Torvalds2018-04-11 19:28:32 +0200
commit69ca372c100fba99c78ef826a1795aa86e4f01a8 (patch)
tree4417bd26e5d066f21716baebcb02db34af21c5d1 /lib/Makefile
parentkasan: fix invalid-free test crashing the kernel (diff)
downloadkernel-qcow2-linux-69ca372c100fba99c78ef826a1795aa86e4f01a8.tar.gz
kernel-qcow2-linux-69ca372c100fba99c78ef826a1795aa86e4f01a8.tar.xz
kernel-qcow2-linux-69ca372c100fba99c78ef826a1795aa86e4f01a8.zip
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@google.com Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Nick Terrell <terrelln@fb.com> Cc: Chris Mason <clm@fb.com> Cc: Yury Norov <ynorov@caviumnetworks.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: "Luis R . Rodriguez" <mcgrof@kernel.org> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: "Paul E . McKenney" <paulmck@linux.vnet.ibm.com> Cc: Jeff Layton <jlayton@redhat.com> Cc: "Jason A . Donenfeld" <Jason@zx2c4.com> Cc: Kostya Serebryany <kcc@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/Makefile')
-rw-r--r--lib/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/Makefile b/lib/Makefile
index 8fc0d3a9b34f..6200f978740d 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -53,6 +53,7 @@ obj-$(CONFIG_TEST_FIRMWARE) += test_firmware.o
obj-$(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