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

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Date:	Mon, 4 Jul 2011 08:27:47 +0530
From:	Balbir Singh <bsingharora@...il.com>
To:	Vasiliy Kulikov <segoon@...nwall.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	David Rientjes <rientjes@...gle.com>,
	Stephen Wilson <wilsons@...rt.ca>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	security@...nel.org, Eric Paris <eparis@...hat.com>,
	kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH 2/2] taskstats: restrict access to user

On Sat, Jul 2, 2011 at 1:06 PM, Vasiliy Kulikov <segoon@...nwall.com> wrote:
> On Thu, Jun 30, 2011 at 00:17 +0400, Vasiliy Kulikov wrote:
>> On Wed, Jun 29, 2011 at 06:57 +0530, Balbir Singh wrote:
>> > On Fri, Jun 24, 2011 at 5:39 PM, Vasiliy Kulikov <segoon@...nwall.com> wrote:
>> > > +               task = find_task_by_vpid(s->pid);
>> > > +               if (!task || __task_cred(task)->euid != cred->euid) {
>>
>> If consider this patch for inclusion, it also needs some check for
>> the listener root ability.  __task_cred(task)->euid == 0 or smth like
>> that.  But ptrace_task_may_access_current() is better.
>
> So...  What to do with this patch?  Should I resend it with euid==0 and
> rcu optimication, wait for the new ptrace interface or what?
>
>
Hi, Vasiliy,

Would it be possible to audit the entire taskstats structure to see
what fields should and should not be exposed. If a particular field
should not be exposed, we can fill it in with a special value
indicating additional permission is required to see it and fill in
those fields only when credentials match like you've shown

Does that make sense?
Balbir Singh
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