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mm/Makefile: disable KCSAN for kmemleak

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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.

Suggested-by: Marco Elver <elver@google.com>
Signed-off-by: Qian Cai <cai@lca.pw>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Marco Elver <elver@google.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: http://lkml.kernel.org/r/1583263716-25150-1-git-send-email-cai@lca.pw
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Qian Cai 2020-04-01 21:04:37 -07:00 committed by Linus Torvalds
parent b0d14fc43d
commit 5f2d5026be
1 changed files with 1 additions and 0 deletions
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mm/Makefile
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@ -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