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  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]
Date:   Mon, 03 Aug 2020 15:58:35 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH net v2] net: bridge: clear skb private space on bridge
 dev xmit

From: Nikolay Aleksandrov <>
Date: Sun,  2 Aug 2020 15:50:39 +0300

> We need to clear all of the bridge private skb variables as they can be
> stale due to the packet having skb->cb initialized earlier and then
> transmitted through the bridge device. Similar memset is already done on
> bridge's input. We've seen cases where proxyarp_replied was 1 on routed
> multicast packets transmitted through the bridge to ports with neigh
> suppress and were getting dropped. Same thing can in theory happen with the
> port isolation bit as well. We clear only the struct part after the bridge
> pointer (currently 8 bytes) since the pointer is always set later.
> We can now remove the redundant zeroing of frag_max_size.
> Also add a BUILD_BUG_ON to make sure we catch any movement of the bridge
> dev pointer.
> Fixes: 821f1b21cabb ("bridge: add new BR_NEIGH_SUPPRESS port flag to suppress arp and nd flood")
> Signed-off-by: Nikolay Aleksandrov <>

Nikolay, I applied v1 already as I'm not at all against the full clear.

Powered by blists - more mailing lists