From: Qian Cai <cai@xxxxxx> Subject: mm/Makefile: disable KCSAN for kmemleak Kmemleak could scan task stacks while plain writes happens to those stack variables which could results in data races. For example, in sys_rt_sigaction and do_sigaction(), it could have plain writes in a 32-byte size. Since the kmemleak does not care about the actual values of a non-pointer and all do_sigaction() call sites only copy to stack variables, just disable KCSAN for kmemleak to avoid annotating anything outside Kmemleak just because Kmemleak scans everything. Link: http://lkml.kernel.org/r/1583263716-25150-1-git-send-email-cai@xxxxxx Signed-off-by: Qian Cai <cai@xxxxxx> Suggested-by: Marco Elver <elver@xxxxxxxxxx> Acked-by: Marco Elver <elver@xxxxxxxxxx> Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/Makefile | 1 + 1 file changed, 1 insertion(+) --- a/mm/Makefile~mm-disable-kcsan-for-kmemleak +++ a/mm/Makefile @@ -6,6 +6,7 @@ KASAN_SANITIZE_slab_common.o := n KASAN_SANITIZE_slab.o := n KASAN_SANITIZE_slub.o := n +KCSAN_SANITIZE_kmemleak.o := n # These files are disabled because they produce non-interesting and/or # flaky coverage that is not a function of syscall inputs. E.g. slab is out of _
