netdev - Re: [Kernel][NET] Bug report on packet defragmenting

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]

Date:   Wed, 7 Nov 2018 17:43:09 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     soukjin.bae@...sung.com,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [Kernel][NET] Bug report on packet defragmenting

On 11/07/2018 05:29 PM, 배석진 wrote:

> If ipv6_defrag hook is not excuted simultaneously, then it's ok.
> ipv6_defrag hook can handle that. [exam 3]

This seems wrong.

This is the root cause, we should not try to work around it but fix it.

There is no guarantee that RSS/RPS/RFS can help here, packets can sit in per-cpu
backlogs long enough to reproduce the issue, if RX queues interrupts are spread
over many cpus.