linux-kernel - Re: [PATCH] Restrict unprivileged access to kernel syslog

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Message-ID: <20101109142044.GA4473@elte.hu>
Date:	Tue, 9 Nov 2010 15:20:44 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Dan Rosenberg <drosenberg@...curity.com>,
	linux-kernel@...r.kernel.org, security@...nel.org,
	stable@...nel.org, Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] Restrict unprivileged access to kernel syslog


* Arjan van de Ven <arjan@...radead.org> wrote:

> On Tue, 09 Nov 2010 07:11:12 -0500
> Dan Rosenberg <drosenberg@...curity.com> wrote:
> 
> > 
> > > 
> > > The initialization to zero is implicit, no need to write it out.
> > > 
> > 
> > I'll resend after the first round of comments.
> > 
> > > Also, it would also be useful to have a
> > > CONFIG_SECURITY_RESTRICT_DMESG=y option introduced by your patch as
> > > well, which flag allows a distro or user to disable unprivileged
> > > syslog reading via the kernel config.
> > 
> > Are you suggesting having the existence of the sysctl depend on 
> > CONFIG_SECURITY_RESTRICT_DMESG, or having a choice between a sysctl (when config 
> > is disabled) and having restrictions always on (when config is enabled)?
> 
> and/or have the sysctl default value depend on the config option

Yeah. I think we should have the sysctl unconditionally as in Dan's current patch - 
and make the default depend on the Kconfig setting (defaulting to off).

I.e. essentially the same as the current patch, just a bit more configurability via 
the Kconfig setting.

Thanks,

	Ingo
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