linux-kernel - Re: [Security] [PATCH 2/2] taskstats: restrict access to user

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Date:	Tue, 20 Sep 2011 08:47:37 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Vasiliy Kulikov <segoon@...nwall.com>,
	Balbir Singh <bsingharora@...il.com>,
	Shailabh Nagar <nagar@...ibm.com>,
	linux-kernel@...r.kernel.org, security@...nel.org,
	Eric Paris <eparis@...hat.com>,
	Stephen Wilson <wilsons@...rt.ca>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	kernel-hardening@...ts.openwall.com
Subject: Re: [Security] [PATCH 2/2] taskstats: restrict access to user

On Mon, Sep 19, 2011 at 10:45:20AM -0700, Linus Torvalds wrote:
> On Mon, Sep 19, 2011 at 10:39 AM, Vasiliy Kulikov <segoon@...nwall.com> wrote:
> >
> > Shouldn't it simply protect taskstats_user_cmd()?  You may still poll
> > the counters with TASKSTATS_CMD_ATTR_PID/TASKSTATS_CMD_ATTR_TGID.
> 
> Yeah, I wondered where I'd really want to hook it in, that was the
> other option.
> 
> However, one thing that I'm currently independently asking some
> networking people is whether that patch guarantees anything at all: is
> the netlink command even guaranteed to be run in the same context as
> the person sending it?
> 
> After all, it comes in as a packet of data.  How synchronous is the
> genetlink thing guaranteed to be in the first place?
> 
> IOW, are *any* of those "check current capabilities/euid" approaches
> really guaranteed to be valid? Are they valid today, will they
> necessarily be valid in a year?

Netlink was made syncronous by commit cd40b7d3983c708aabe3d3008ec64ffce56d33b0
"[NET]: make netlink user -> kernel interface synchronious".
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