From: Andrey Konovalov <[email protected]> commit 69ca372c100fba99c78ef826a1795aa86e4f01a8 upstream.
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.andreyk...@google.com Signed-off-by: Andrey Konovalov <[email protected]> Acked-by: Andrey Ryabinin <[email protected]> Cc: Alexander Potapenko <[email protected]> Cc: Dmitry Vyukov <[email protected]> Cc: Geert Uytterhoeven <[email protected]> Cc: Nick Terrell <[email protected]> Cc: Chris Mason <[email protected]> Cc: Yury Norov <[email protected]> Cc: Al Viro <[email protected]> Cc: "Luis R . Rodriguez" <[email protected]> Cc: Palmer Dabbelt <[email protected]> Cc: "Paul E . McKenney" <[email protected]> Cc: Jeff Layton <[email protected]> Cc: "Jason A . Donenfeld" <[email protected]> Cc: Kostya Serebryany <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> Signed-off-by: Andrey Konovalov <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- lib/Makefile | 1 + 1 file changed, 1 insertion(+) --- a/lib/Makefile +++ b/lib/Makefile @@ -50,6 +50,7 @@ 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
