linux-kernel - Re: [PATCH v4 0/3] net: unix: fix use-after-free

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Date:	Sun, 11 Oct 2015 04:55:57 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jbaron@...mai.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	minipli@...glemail.com, normalperson@...t.net,
	eric.dumazet@...il.com, rweikusat@...ileactivedefense.com,
	viro@...iv.linux.org.uk, davidel@...ilserver.org,
	dave@...olabs.net, olivier@...ras.ch, pageexec@...email.hu,
	torvalds@...ux-foundation.org, peterz@...radead.org,
	joe@...ches.com
Subject: Re: [PATCH v4 0/3] net: unix: fix use-after-free

From: Jason Baron <jbaron@...mai.com>
Date: Fri,  9 Oct 2015 00:15:59 -0400

> These patches are against mainline, I can re-base to net-next, please
> let me know.
> 
> They have been tested against: https://lkml.org/lkml/2015/9/13/195,
> which causes the use-after-free quite quickly and here:
> https://lkml.org/lkml/2015/10/2/693.

I'd like to understand how patches that don't even compile can be
"tested"?

net/unix/af_unix.c: In function ‘unix_dgram_writable’:
net/unix/af_unix.c:2480:3: error: ‘other_full’ undeclared (first use in this function)
net/unix/af_unix.c:2480:3: note: each undeclared identifier is reported only once for each function it appears in

Could you explain how that works, I'm having a hard time understanding
this?

Also please address Hannes's feedback, thanks.