netdev - Re: [PATCH net-next 0/2] veth: a couple of fixes

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: <eebf1c5ae11db046256eeb1aa287a0019adc3606.camel@redhat.com>
Date:   Mon, 21 Nov 2022 11:11:05 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     Heng Qi <hengqi@...ux.alibaba.com>,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>,
        John Fastabend <john.fastabend@...il.com>
Subject: Re: [PATCH net-next 0/2] veth: a couple of fixes

On Mon, 2022-11-21 at 11:55 +0800, Heng Qi wrote:
> 在 2022/11/21 上午11:33, Xuan Zhuo 写道:
> > On Fri, 18 Nov 2022 09:41:05 +0100, Paolo Abeni <pabeni@...hat.com> wrote:
> > > On Fri, 2022-11-18 at 00:33 +0100, Paolo Abeni wrote:
> > > > Recent changes in the veth driver caused a few regressions
> > > > this series addresses a couple of them, causing oops.
> > > > 
> > > > Paolo Abeni (2):
> > > >    veth: fix uninitialized napi disable
> > > >    veth: fix double napi enable
> > > > 
> > > >   drivers/net/veth.c | 6 ++++--
> > > >   1 file changed, 4 insertions(+), 2 deletions(-)
> > > @Xuan Zhuo: another option would be reverting 2e0de6366ac1 ("veth:
> > > Avoid drop packets when xdp_redirect performs") and its follow-up
> > > 5e5dc33d5dac ("bpf: veth driver panics when xdp prog attached before
> > > veth_open").
> > >  option would be possibly safer, because I feel there are other
> > > issues with 2e0de6366ac1, and would offer the opportunity to refactor
> > > its logic a bit: the napi enable/disable condition is quite complex and
> > > not used consistently mixing and alternating the gro/xdp/peer xdp check
> > > with the napi ptr dereference.
> > > 
> > > Ideally it would be better to have an helper alike
> > > napi_should_be_enabled(), use it everywhere, and pair the new code with
> > > some selftests, extending the existing ones.
> > > 
> > > WDYT?
> > I take your point.
> 
> I'll rewrite a patch as soon as possible and resubmit it.

Could you please first send the revert?

Thanks!

Paolo