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Tue, 17 Mar 2026 15:09:44 -0700 (PDT) From: Bobby Eshleman Date: Tue, 17 Mar 2026 15:09:36 -0700 Subject: [PATCH net-next v2 2/2] selftests/vsock: fix vsock_test path shadowing in nested VMs Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260317-vsock-vmtest-nested-fixes-v2-2-0b3f53b80a0f@meta.com> References: <20260317-vsock-vmtest-nested-fixes-v2-0-0b3f53b80a0f@meta.com> In-Reply-To: <20260317-vsock-vmtest-nested-fixes-v2-0-0b3f53b80a0f@meta.com> To: Stefano Garzarella , Shuah Khan Cc: virtualization@lists.linux.dev, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Jakub Kicinski , Bobby Eshleman X-Mailer: b4 0.14.3 From: Bobby Eshleman The /root mount introduced for nested VM support shadows any host paths under /root. This breaks systems where the outer VM runs as root and the vsock_test binary path is something like: /root/linux/tools/testing/selftests/vsock/vsock_test Fix this by copying vsock_test into the temporary home directory that gets mounted as /root in the guest, and using a relative path to invoke it. Signed-off-by: Bobby Eshleman --- tools/testing/selftests/vsock/vmtest.sh | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/vsock/vmtest.sh b/tools/testing/selfte= sts/vsock/vmtest.sh index a4b56322ce9b..30c06544f2e5 100755 --- a/tools/testing/selftests/vsock/vmtest.sh +++ b/tools/testing/selftests/vsock/vmtest.sh @@ -393,6 +393,7 @@ handle_build() { setup_home() { mkdir -p "$(dirname "${SSH_KEY_PATH}")" ssh-keygen -t ed25519 -f "${SSH_KEY_PATH}" -N "" -q + cp "${VSOCK_TEST}" "${TEST_HOME}"/vsock_test } =20 create_pidfile() { @@ -601,7 +602,7 @@ vm_vsock_test() { # log output and use pipefail to respect vsock_test errors set -o pipefail if [[ "${host}" !=3D server ]]; then - vm_ssh "${ns}" -- "${VSOCK_TEST}" \ + vm_ssh "${ns}" -- ./vsock_test \ --mode=3Dclient \ --control-host=3D"${host}" \ --peer-cid=3D"${cid}" \ @@ -609,7 +610,7 @@ vm_vsock_test() { 2>&1 | log_guest rc=3D$? else - vm_ssh "${ns}" -- "${VSOCK_TEST}" \ + vm_ssh "${ns}" -- ./vsock_test \ --mode=3Dserver \ --peer-cid=3D"${cid}" \ --control-port=3D"${port}" \ --=20 2.52.0