selftests: netfilter: skip br_netfilter queue tests if kernel is tainted

JIRA: https://issues.redhat.com/browse/RHEL-107520

commit c21b02f
Author: Florian Westphal <fw@strlen.de>
Date:   Tue, 11 Mar 2025 12:52:45 +0100

    selftests: netfilter: skip br_netfilter queue tests if kernel is tainted

    These scripts fail if the kernel is tainted which leads to wrong test
    failure reports in CI environments when an unrelated test triggers some
    splat.

    Check taint state at start of script and SKIP if its already dodgy.

    Signed-off-by: Florian Westphal <fw@strlen.de>
    Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

Signed-off-by: Waiman Long <longman@redhat.com>

Author: Waiman-Long

tools/testing/selftests/net/netfilter/br_netfilter.sh

@@ -13,6 +13,12 @@ source lib.sh
 
 checktool "nft --version" "run test without nft tool"
 
+read t < /proc/sys/kernel/tainted
+if [ "$t" -ne 0 ];then
+	echo SKIP: kernel is tainted
+	exit $ksft_skip
+fi
+
 cleanup() {
 	cleanup_all_ns
 }
@@ -161,6 +167,7 @@ if [ "$t" -eq 0 ];then
 	echo PASS: kernel not tainted
 else
 	echo ERROR: kernel is tainted
+	dmesg
 	ret=1
 fi
 

tools/testing/selftests/net/netfilter/br_netfilter_queue.sh

@@ -4,6 +4,12 @@ source lib.sh
 
 checktool "nft --version" "run test without nft tool"
 
+read t < /proc/sys/kernel/tainted
+if [ "$t" -ne 0 ];then
+	echo SKIP: kernel is tainted
+	exit $ksft_skip
+fi
+
 cleanup() {
 	cleanup_all_ns
 }
@@ -72,6 +78,7 @@ if [ "$t" -eq 0 ];then
 	echo PASS: kernel not tainted
 else
 	echo ERROR: kernel is tainted
+	dmesg
 	exit 1
 fi
 

tools/testing/selftests/net/netfilter/nft_queue.sh

@@ -407,6 +407,7 @@ EOF
 		echo "PASS: queue program exiting while packets queued"
 	else
 		echo "TAINT: queue program exiting while packets queued"
+		dmesg
 		ret=1
 	fi
 }