netdev - Re: [PATCH v2] unix: properly account for FDs passed over unix sockets

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Date:	Tue, 2 Feb 2016 21:49:55 +0100
From:	Willy Tarreau <w@....eu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	David Herrmann <dh.herrmann@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	???????? ?????????????????? <socketpair@...il.com>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Simon McVittie <simon.mcvittie@...labora.co.uk>
Subject: Re: [PATCH v2] unix: properly account for FDs passed over unix sockets

On Tue, Feb 02, 2016 at 12:44:54PM -0800, Linus Torvalds wrote:
> On Tue, Feb 2, 2016 at 12:32 PM, Hannes Frederic Sowa
> <hannes@...essinduktion.org> wrote:
> > But "struct pid *" in unix_skb_parms should be enough to get us to
> > corresponding "struct cred *" so we can decrement the correct counter during
> > skb destruction.
> 
> Umm. I think the "struct cred" may change in between, can't it?

You mean for example in case of setuid() or something like this ?

willy