linux-kernel - [PATCH -next 1/2] mm: disable KCSAN for kmemleak

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Tue,  3 Mar 2020 14:28:35 -0500
From:   Qian Cai <cai@....pw>
To:     akpm@...ux-foundation.org
Cc:     elver@...gle.com, catalin.marinas@....com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Qian Cai <cai@....pw>
Subject: [PATCH -next 1/2] mm: 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.

Suggested-by: Marco Elver <elver@...gle.com>
Signed-off-by: Qian Cai <cai@....pw>
---
 mm/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/Makefile b/mm/Makefile
index 946754cc66b6..6e263045f0c2 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -14,6 +14,7 @@ KCSAN_SANITIZE_slab_common.o := n
 KCSAN_SANITIZE_slab.o := n
 KCSAN_SANITIZE_slub.o := n
 KCSAN_SANITIZE_page_alloc.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
-- 
1.8.3.1