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] [day] [month] [year] [list]
Message-ID: <20241108035546.2055996-2-elliot.ayrey@alliedtelesis.co.nz>
Date: Fri,  8 Nov 2024 16:55:43 +1300
From: Elliot Ayrey <elliot.ayrey@...iedtelesis.co.nz>
To: "David S . Miller" <davem@...emloft.net>,
	Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	Vladimir Oltean <olteanv@...il.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Roopa Prabhu <roopa@...dia.com>,
	Nikolay Aleksandrov <razor@...ckwall.org>,
	Simon Horman <horms@...nel.org>
Cc: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	bridge@...ts.linux.dev,
	Elliot Ayrey <elliot.ayrey@...iedtelesis.co.nz>
Subject: [RFC net-next (resend) 1/4] net: bridge: respect sticky flag on external learn

The fdb sticky flag is used to stop a host from roaming to another
port. However upon receiving a switchdev notification to update an fdb
entry the sticky flag is not respected and as long as the new entry is
not locked the host will be allowed to roam to the new port.

Fix this by considering the sticky flag before allowing an externally
learned host to roam.

Signed-off-by: Elliot Ayrey <elliot.ayrey@...iedtelesis.co.nz>
---
 net/bridge/br_fdb.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index 1cd7bade9b3b..72663ca824d3 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -1457,7 +1457,8 @@ int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 
 		fdb->updated = jiffies;
 
-		if (READ_ONCE(fdb->dst) != p) {
+		if (READ_ONCE(fdb->dst) != p &&
+		    !test_bit(BR_FDB_STICKY, &fdb->flags)) {
 			WRITE_ONCE(fdb->dst, p);
 			modified = true;
 		}

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ