netdev - Re: [PATCH v1 net 03/11] af_unix: Stop recv(MSG

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Message-ID: <014f053032241c56a0f76ea897caa6a08d3b3f7b.camel@redhat.com>
Date: Wed, 26 Jun 2024 18:56:57 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Kuniyuki Iwashima <kuniyu@...zon.com>, Rao Shoaib <Rao.Shoaib@...cle.com>
Cc: Kuniyuki Iwashima <kuni1840@...il.com>, netdev@...r.kernel.org, "David
 S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub
 Kicinski <kuba@...nel.org>
Subject: Re: [PATCH v1 net 03/11] af_unix: Stop recv(MSG_PEEK) at consumed
 OOB skb.

On Mon, 2024-06-24 at 18:36 -0700, Kuniyuki Iwashima wrote:
> After consuming OOB data, recv() reading the preceding data must break at
> the OOB skb regardless of MSG_PEEK.
> 
> Currently, MSG_PEEK does not stop recv() for AF_UNIX, and the behaviour is
> not compliant with TCP.

I'm unsure we can change the MSG_PEEK behavior at this point: existing
application(s?) could relay on that, regardless of how inconsistent
such behavior is.

I think we need at least an explicit ack from Rao, as the main known
user.

Paolo