linux-kernel - Re: [PATCH 2/2] sysctl: allow CLONE

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Message-ID: <CAP145pgdjQ4ALiq0wN9s-7PP5pxfMJs5xY7rdCjtYua6guUZqg@mail.gmail.com>
Date:	Fri, 22 Jan 2016 23:55:05 +0100
From:	Robert Święcki <robert@...ecki.net>
To:	Kees Cook <keescook@...omium.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Richard Weinberger <richard@....at>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andy Lutomirski <luto@...capital.net>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	David Howells <dhowells@...hat.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH 2/2] sysctl: allow CLONE_NEWUSER to be disabled

2016-01-22 23:50 GMT+01:00 Kees Cook <keescook@...omium.org>:

>> Seems that Debian and some older Ubuntu versions are already using
>>
>> $ sysctl -a | grep usern
>> kernel.unprivileged_userns_clone = 0
>>
>> Shall we be consistent wit it?
>
> Oh! I didn't see that on systems I checked. On which version did you find that?

$ uname -a
Linux bc1 4.3.0-0.bpo.1-amd64 #1 SMP Debian 4.3.3-5~bpo8+1
(2016-01-07) x86_64 GNU/Linux
$ cat /etc/debian_version
8.2

IIRC some older kernels delivered with Ubuntu Precise were also using
it (but maybe I'm mistaken)

-- 
Robert Święcki