linux-kernel - Re: [PATCH v3 net 1/1] net: dsa: mv88e6xxx: Verify after ATU Load ops

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: <7b5c765e-c648-495f-99d2-6470a494923e@lunn.ch>
Date: Fri, 7 Mar 2025 17:29:49 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Joseph Huang <Joseph.Huang@...min.com>
Cc: netdev@...r.kernel.org, Joseph Huang <joseph.huang.2024@...il.com>,
	Vladimir Oltean <olteanv@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Guenter Roeck <linux@...ck-us.net>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 net 1/1] net: dsa: mv88e6xxx: Verify after ATU Load ops

On Thu, Mar 06, 2025 at 12:23:05PM -0500, Joseph Huang wrote:
> ATU Load operations could fail silently if there's not enough space
> on the device to hold the new entry. When this happens, the symptom
> depends on the unknown flood settings. If unknown multicast flood is
> disabled, the multicast packets are dropped when the ATU table is
> full. If unknown multicast flood is enabled, the multicast packets
> will be flooded to all ports. Either way, IGMP snooping is broken
> when the ATU Load operation fails silently.
> 
> Do a Read-After-Write verification after each fdb/mdb add operation
> to make sure that the operation was really successful, and return
> -ENOSPC otherwise.
> 
> Fixes: defb05b9b9b4 ("net: dsa: mv88e6xxx: Add support for fdb_add, fdb_del, and fdb_getnext")
> Signed-off-by: Joseph Huang <Joseph.Huang@...min.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew