netdev - [PATCH net-next v7 20/26] selftests/vsock: avoid false-positives when checking dmesg

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: <20251021-vsock-vmtest-v7-20-0661b7b6f081@meta.com>
Date: Tue, 21 Oct 2025 16:47:03 -0700
From: Bobby Eshleman <bobbyeshleman@...il.com>
To: Stefano Garzarella <sgarzare@...hat.com>, Shuah Khan <shuah@...nel.org>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Simon Horman <horms@...nel.org>, Stefan Hajnoczi <stefanha@...hat.com>, 
 "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, 
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, 
 Eugenio Pérez <eperezma@...hat.com>, 
 "K. Y. Srinivasan" <kys@...rosoft.com>, 
 Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>, 
 Dexuan Cui <decui@...rosoft.com>, Bryan Tan <bryan-bt.tan@...adcom.com>, 
 Vishnu Dasa <vishnu.dasa@...adcom.com>, 
 Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, 
 Bobby Eshleman <bobbyeshleman@...il.com>
Cc: virtualization@...ts.linux.dev, netdev@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org, 
 kvm@...r.kernel.org, linux-hyperv@...r.kernel.org, berrange@...hat.com, 
 Bobby Eshleman <bobbyeshleman@...a.com>
Subject: [PATCH net-next v7 20/26] selftests/vsock: avoid false-positives
 when checking dmesg

From: Bobby Eshleman <bobbyeshleman@...a.com>

Sometimes VMs will have some intermittent dmesg warnings that are
unrelated to vsock. Change the dmesg parsing to filter on strings
containing 'vsock' to avoid false positive failures that are unrelated
to vsock. The downside is that it is possible for some vsock related
warnings to not contain the substring 'vsock', so those will be missed.

Fixes: a4a65c6fe08b ("selftests/vsock: add initial vmtest.sh for vsock")
Signed-off-by: Bobby Eshleman <bobbyeshleman@...a.com>
---
 tools/testing/selftests/vsock/vmtest.sh | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/vsock/vmtest.sh b/tools/testing/selftests/vsock/vmtest.sh
index 9afe8177167e..b129976e27fc 100755
--- a/tools/testing/selftests/vsock/vmtest.sh
+++ b/tools/testing/selftests/vsock/vmtest.sh
@@ -591,9 +591,9 @@ run_shared_vm_test() {
 	local rc

 	host_oops_cnt_before=$(dmesg | grep -c -i 'Oops')
-	host_warn_cnt_before=$(dmesg --level=warn | wc -l)
+	host_warn_cnt_before=$(dmesg --level=warn | grep -c -i 'vsock')
 	vm_oops_cnt_before=$(vm_ssh "init_ns" -- dmesg | grep -c -i 'Oops')
-	vm_warn_cnt_before=$(vm_ssh "init_ns" -- dmesg --level=warn | wc -l)
+	vm_warn_cnt_before=$(vm_ssh "init_ns" -- dmesg --level=warn | grep -c -i 'vsock')

 	name=$(echo "${1}" | awk '{ print $1 }')
 	eval test_"${name}"
@@ -605,7 +605,7 @@ run_shared_vm_test() {
 		rc=$KSFT_FAIL
 	fi

-	host_warn_cnt_after=$(dmesg --level=warn | wc -l)
+	host_warn_cnt_after=$(dmesg --level=warn | grep -c -i vsock)
 	if [[ ${host_warn_cnt_after} -gt ${host_warn_cnt_before} ]]; then
 		echo "FAIL: kernel warning detected on host" | log_host
 		rc=$KSFT_FAIL
@@ -617,7 +617,7 @@ run_shared_vm_test() {
 		rc=$KSFT_FAIL
 	fi

-	vm_warn_cnt_after=$(vm_ssh "init_ns" -- dmesg --level=warn | wc -l)
+	vm_warn_cnt_after=$(vm_ssh "init_ns" -- dmesg --level=warn | grep -c -i vsock)
 	if [[ ${vm_warn_cnt_after} -gt ${vm_warn_cnt_before} ]]; then
 		echo "FAIL: kernel warning detected on vm" | log_host
 		rc=$KSFT_FAIL

-- 
2.47.3