From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Dan Rosenberg <drosenberg@vsecurity.com>
Cc: linux-kernel@vger.kernel.org, security@kernel.org, stable@kernel.org
Subject: Re: [PATCH] Restrict unprivileged access to kernel syslog
Date: Tue, 9 Nov 2010 12:06:49 +0000 [thread overview]
Message-ID: <20101109120649.62b487e8@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <1289273338.6287.128.camel@dan>
On Mon, 08 Nov 2010 22:28:58 -0500
Dan Rosenberg <drosenberg@vsecurity.com> wrote:
> The kernel syslog contains debugging information that is often useful
> during exploitation of other vulnerabilities, such as kernel heap
> addresses. Rather than futilely attempt to sanitize hundreds (or
> thousands) of printk statements and simultaneously cripple useful
> debugging functionality, it is far simpler to create an option that
> prevents unprivileged users from reading the syslog.
Except for anything that appears on the screen - which is remotely
readable via the screen access APIs. Looks sane to me (pointless but
sane) and the checks match the ones needed to redirect the console so you
need CAP_SYS_ADMIN either way.
next prev parent reply other threads:[~2010-11-09 12:09 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-09 3:28 Dan Rosenberg
2010-11-09 5:34 ` Kees Cook
2010-11-09 5:39 ` [Security] " Eugene Teo
2010-11-09 11:23 ` Ingo Molnar
2010-11-09 12:11 ` Dan Rosenberg
2010-11-09 12:27 ` Arjan van de Ven
2010-11-09 14:20 ` Ingo Molnar
2010-11-09 12:06 ` Alan Cox [this message]
2010-11-17 10:03 ` Pavel Machek
2010-11-09 14:25 Dan Rosenberg
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