On Ubuntu and Debian there is a sysctl which allows to block
clone(CLONE_NEWUSER) via "sysctl kernel.unprivileged_userns_clone=0"
for unprivileged users that do not have CAP_SYS_ADMIN.
See: https://lists.ubuntu.com/archives/kernel-team/2016-January/067926.html
The DockerSuite.TestRunSeccompUnconfinedCloneUserns testcase fails if
"kernel.unprivileged_userns_clone" is set to 0:
docker_cli_run_unix_test.go:1040:
c.Fatalf("expected clone userns with --security-opt seccomp=unconfined
to succeed, got %s: %v", out, err)
... Error: expected clone userns with --security-opt seccomp=unconfined
to succeed, got clone failed: Operation not permitted
: exit status 1
So add a check and skip the testcase if kernel.unprivileged_userns_clone is 0.
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Upstream-commit: 87e4e3af68741afcebf11499d1dcbc91b655b349
Component: engine
ca5f5427a8