linux-kernel - Re: [PATCH] proc: Fix timerslack_ns CAP_SYS

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Message-ID: <65f33d6c-4e51-d659-b6c6-f2eac65c65af@linux.intel.com>
Date:	Wed, 10 Aug 2016 13:01:04 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	John Stultz <john.stultz@...aro.org>,
	Kees Cook <keescook@...omium.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Oren Laadan <orenl@...lrox.com>,
	Ruchi Kandoi <kandoiruchi@...gle.com>,
	Rom Lemarchand <romlem@...roid.com>,
	Todd Kjos <tkjos@...gle.com>, Colin Cross <ccross@...roid.com>,
	Nick Kralevich <nnk@...gle.com>,
	Dmitry Shmidt <dimitrysh@...gle.com>,
	Elliott Hughes <enh@...gle.com>,
	Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [PATCH] proc: Fix timerslack_ns CAP_SYS_NICE check when adjusting
 self

On 8/10/2016 12:03 PM, John Stultz wrote:

> I wasn't entierly sure. I didn't think PR_SET_TIMERSLACK has a
> security hook, but looking again I now see the top-level
> security_task_prctl() check, so maybe not skipping it in this case
> would be good?

the easy fix would be to add back the ptrace check.. just either ptrace-able OR CAP_SYS_NICE ;)
then you can prove you only added new stuff as well, and have all the LSM from before