linux-kernel - [PATCH v4 5/7] kselftests: cgroup: don't fail on cg_kill_all() error in cg

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

Message-Id: <20181130234745.6756-6-guro@fb.com>
Date:   Fri, 30 Nov 2018 15:47:43 -0800
From:   Roman Gushchin <guroan@...il.com>
To:     Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        cgroups@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...com,
        Roman Gushchin <guro@...com>, Shuah Khan <shuah@...nel.org>,
        linux-kselftest@...r.kernel.org
Subject: [PATCH v4 5/7] kselftests: cgroup: don't fail on cg_kill_all() error in cg_destroy()

If the cgroup destruction races with an exit() of a belonging
process(es), cg_kill_all() may fail. It's not a good reason to make
cg_destroy() fail and leave the cgroup in place, potentially causing
next test runs to fail.

Signed-off-by: Roman Gushchin <guro@...com>
Cc: Shuah Khan <shuah@...nel.org>
Cc: Tejun Heo <tj@...nel.org>
Cc: kernel-team@...com
Cc: linux-kselftest@...r.kernel.org
---
 tools/testing/selftests/cgroup/cgroup_util.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/tools/testing/selftests/cgroup/cgroup_util.c b/tools/testing/selftests/cgroup/cgroup_util.c
index 14c9fe284806..eba06f94433b 100644
--- a/tools/testing/selftests/cgroup/cgroup_util.c
+++ b/tools/testing/selftests/cgroup/cgroup_util.c
@@ -227,9 +227,7 @@ int cg_destroy(const char *cgroup)
 retry:
 	ret = rmdir(cgroup);
 	if (ret && errno == EBUSY) {
-		ret = cg_killall(cgroup);
-		if (ret)
-			return ret;
+		cg_killall(cgroup);
 		usleep(100);
 		goto retry;
 	}
-- 
2.17.2