[PATCH] selftest: net: Improve IPV6_TCLASS/IPV6_HOPLIMIT tests apparmor compatibility

From: Andrei Gherzan <andrei.gherzan@canonical.com>
To: "David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	Shuah Khan <shuah@kernel.org>
Cc: Andrei Gherzan <andrei.gherzan@canonical.com>,
	netdev@vger.kernel.org, linux-kselftest@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH] selftest: net: Improve IPV6_TCLASS/IPV6_HOPLIMIT tests apparmor compatibility
Date: Thu, 26 Jan 2023 16:55:48 +0000	[thread overview]
Message-ID: <20230126165548.230453-1-andrei.gherzan@canonical.com> (raw)

"tcpdump" is used to capture traffic in these tests while using a random,
temporary and not suffixed file for it. This can interfere with apparmor
configuration where the tool is only allowed to read from files with
'known' extensions.

The MINE type application/vnd.tcpdump.pcap was registered with IANA for
pcap files and .pcap is the extension that is both most common but also
aligned with standard apparmor configurations. See TCPDUMP(8) for more
details.

This improves compatibility with standard apparmor configurations by
using ".pcap" as the file extension for the tests' temporary files.

Signed-off-by: Andrei Gherzan <andrei.gherzan@canonical.com>
---
 tools/testing/selftests/net/cmsg_ipv6.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/net/cmsg_ipv6.sh b/tools/testing/selftests/net/cmsg_ipv6.sh
index 2d89cb0ad288..330d0b1ceced 100755
--- a/tools/testing/selftests/net/cmsg_ipv6.sh
+++ b/tools/testing/selftests/net/cmsg_ipv6.sh
@@ -6,7 +6,7 @@ ksft_skip=4
 NS=ns
 IP6=2001:db8:1::1/64
 TGT6=2001:db8:1::2
-TMPF=`mktemp`
+TMPF=$(mktemp --suffix ".pcap")
 
 cleanup()
 {
-- 
2.34.1

