[PATCH nf] selftests: netfilter: skip br_netfilter queue tests if kernel is tainted

[Florian Westphal <fw@strlen.de>]

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>
---
 tools/testing/selftests/net/netfilter/br_netfilter.sh      | 7 +++++++
 .../testing/selftests/net/netfilter/br_netfilter_queue.sh  | 7 +++++++
 tools/testing/selftests/net/netfilter/nft_queue.sh         | 1 +
 3 files changed, 15 insertions(+)

diff --git a/tools/testing/selftests/net/netfilter/br_netfilter.sh b/tools/testing/selftests/net/netfilter/br_netfilter.sh
index c28379a965d8..1559ba275105 100755
--- a/tools/testing/selftests/net/netfilter/br_netfilter.sh
+++ b/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 $ksft_skip
+fi
+
 cleanup() {
 	cleanup_all_ns
 }
@@ -165,6 +171,7 @@ if [ "$t" -eq 0 ];then
 	echo PASS: kernel not tainted
 else
 	echo ERROR: kernel is tainted
+	dmesg
 	ret=1
 fi
 
diff --git a/tools/testing/selftests/net/netfilter/br_netfilter_queue.sh b/tools/testing/selftests/net/netfilter/br_netfilter_queue.sh
index 6a764d70ab06..4788641717d9 100755
--- a/tools/testing/selftests/net/netfilter/br_netfilter_queue.sh
+++ b/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
 
diff --git a/tools/testing/selftests/net/netfilter/nft_queue.sh b/tools/testing/selftests/net/netfilter/nft_queue.sh
index 785e3875a6da..784d1b46912b 100755
--- a/tools/testing/selftests/net/netfilter/nft_queue.sh
+++ b/tools/testing/selftests/net/netfilter/nft_queue.sh
@@ -593,6 +593,7 @@ EOF
 		echo "PASS: queue program exiting while packets queued"
 	else
 		echo "TAINT: queue program exiting while packets queued"
+		dmesg
 		ret=1
 	fi
 }
-- 
2.45.3