netdev - Re: [PATCH 1/6] netfilter: ipset: fix suspicious RCU usage in find_set_and

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Message-ID: <20200201130549.3ee9a6b7@cakuba.hsd1.ca.comcast.net>
Date:   Sat, 1 Feb 2020 13:05:49 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Pablo Neira Ayuso <pablo@...filter.org>, Greg KH <greg@...ah.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     netfilter-devel@...r.kernel.org, davem@...emloft.net,
        netdev@...r.kernel.org
Subject: Re: [PATCH 1/6] netfilter: ipset: fix suspicious RCU usage in
 find_set_and_id

On Sat, 1 Feb 2020 12:57:36 -0800, Jakub Kicinski wrote:
> On Fri, 31 Jan 2020 20:24:23 +0100, Pablo Neira Ayuso wrote:
> > From: Kadlecsik József <kadlec@...ckhole.kfki.hu>
> > 
> > find_set_and_id() is called when the NFNL_SUBSYS_IPSET mutex is held.
> > However, in the error path there can be a follow-up recvmsg() without
> > the mutex held. Use the start() function of struct netlink_dump_control
> > instead of dump() to verify and report if the specified set does not
> > exist.
> > 
> > Thanks to Pablo Neira Ayuso for helping me to understand the subleties
> > of the netlink protocol.
> > 
> > Reported-by: syzbot+fc69d7cb21258ab4ae4d@...kaller.appspotmail.com
> > Signed-off-by: Jozsef Kadlecsik <kadlec@...filter.org>
> > Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>  
> 
> This will trigger a missing signed-off-by check:
> 
> Commit 5038517119d5 ("netfilter: ipset: fix suspicious RCU usage in find_set_and_id")
> 	author Signed-off-by missing
> 	author email:    kadlec@...ckhole.kfki.hu
> 	committer email: pablo@...filter.org
> 	Signed-off-by: Jozsef Kadlecsik <kadlec@...filter.org>
> 	Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
> 
> Problem is that the name differs by 'o' vs 'ó' (József Kadlecsik).
> 
> I wonder if it's worth getting rid of diacritics for the comparison..

Mm.. also the name and surname are the other way around :S