From: Bobby Eshleman bobbyeshleman@meta.com

Add tests to verify CID collision rules across different vsock namespace modes.

1. Two VMs with the same CID cannot start in different global namespaces (ns_global_same_cid_fails) 2. Two VMs with the same CID can start in different local namespaces (ns_local_same_cid_ok) 3. VMs with the same CID can coexist when one is in a global namespace and another is in a local namespace (ns_global_local_same_cid_ok and ns_local_global_same_cid_ok)

The tests ns_global_local_same_cid_ok and ns_local_global_same_cid_ok make sure that ordering does not matter.

The tests use a shared helper function namespaces_can_boot_same_cid() that attempts to start two VMs with identical CIDs in the specified namespaces and verifies whether VM initialization failed or succeeded.

Reviewed-by: Stefano Garzarella sgarzare@redhat.com Signed-off-by: Bobby Eshleman bobbyeshleman@meta.com --- Changes in v11: - check vm_start() rc in namespaces_can_boot_same_cid() (Stefano) - fix ns_local_same_cid_ok() to use local0 and local1 instead of reusing local0 twice. This check should pass, ensuring local namespaces do not collide (Stefano) --- tools/testing/selftests/vsock/vmtest.sh | 78 +++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+)

diff --git a/tools/testing/selftests/vsock/vmtest.sh b/tools/testing/selftests/vsock/vmtest.sh index 38785a102236..1bf537410ea6 100755 --- a/tools/testing/selftests/vsock/vmtest.sh +++ b/tools/testing/selftests/vsock/vmtest.sh @@ -50,6 +50,10 @@ readonly TEST_NAMES=( vm_loopback ns_host_vsock_ns_mode_ok ns_host_vsock_child_ns_mode_ok + ns_global_same_cid_fails + ns_local_same_cid_ok + ns_global_local_same_cid_ok + ns_local_global_same_cid_ok ) readonly TEST_DESCS=( # vm_server_host_client @@ -66,6 +70,18 @@ readonly TEST_DESCS=(

# ns_host_vsock_child_ns_mode_ok "Check /proc/sys/net/vsock/ns_mode is read-only and child_ns_mode is writable." + + # ns_global_same_cid_fails + "Check QEMU fails to start two VMs with same CID in two different global namespaces." + + # ns_local_same_cid_ok + "Check QEMU successfully starts two VMs with same CID in two different local namespaces." + + # ns_global_local_same_cid_ok + "Check QEMU successfully starts one VM in a global ns and then another VM in a local ns with the same CID." + + # ns_local_global_same_cid_ok + "Check QEMU successfully starts one VM in a local ns and then another VM in a global ns with the same CID." )

readonly USE_SHARED_VM=( @@ -577,6 +593,68 @@ test_ns_host_vsock_ns_mode_ok() { return "${KSFT_PASS}" }

+namespaces_can_boot_same_cid() { + local ns0=$1 + local ns1=$2 + local pidfile1 pidfile2 + local rc + + pidfile1="$(create_pidfile)" + + # The first VM should be able to start. If it can't then we have + # problems and need to return non-zero. + if ! vm_start "${pidfile1}" "${ns0}"; then + return 1 + fi + + pidfile2="$(create_pidfile)" + vm_start "${pidfile2}" "${ns1}" + rc=$? + terminate_pidfiles "${pidfile1}" "${pidfile2}" + + return "${rc}" +} + +test_ns_global_same_cid_fails() { + init_namespaces + + if namespaces_can_boot_same_cid "global0" "global1"; then + return "${KSFT_FAIL}" + fi + + return "${KSFT_PASS}" +} + +test_ns_local_global_same_cid_ok() { + init_namespaces + + if namespaces_can_boot_same_cid "local0" "global0"; then + return "${KSFT_PASS}" + fi + + return "${KSFT_FAIL}" +} + +test_ns_global_local_same_cid_ok() { + init_namespaces + + if namespaces_can_boot_same_cid "global0" "local0"; then + return "${KSFT_PASS}" + fi + + return "${KSFT_FAIL}" +} + +test_ns_local_same_cid_ok() { + init_namespaces + + if namespaces_can_boot_same_cid "local0" "local1"; then + return "${KSFT_PASS}" + fi + + return "${KSFT_FAIL}" +} + test_ns_host_vsock_child_ns_mode_ok() { local orig_mode local rc