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From: Joel Fernandes <joel@joelfernandes.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: chris.hyser@oracle.com, joshdon@google.com, mingo@kernel.org,
	vincent.guittot@linaro.org, valentin.schneider@arm.com,
	mgorman@suse.de, linux-kernel@vger.kernel.org, tj@kernel.org,
	tglx@linutronix.de
Subject: Re: [PATCH 5/9] sched: prctl() core-scheduling interface
Date: Sat, 17 Apr 2021 23:52:25 -0400	[thread overview]
Message-ID: <YHus+cmlfdErEi97@google.com> (raw)
In-Reply-To: <YG3lMaqnH10s6JfN@hirez.programming.kicks-ass.net>

On Wed, Apr 07, 2021 at 07:00:33PM +0200, Peter Zijlstra wrote:
> On Thu, Apr 01, 2021 at 03:10:17PM +0200, Peter Zijlstra wrote:
> 
> > Current hard-coded policies are:
> > 
> >  - a user can clear the cookie of any process they can set a cookie for.
> >    Lack of a cookie *might* be a security issue if cookies are being used
> >    for that.
> 
> ChromeOS people, what are you doing about this? syscall/prctl filtering?

Yes, in ChromeOS, we allow the prctl(2) syscall only before entering the
seccomp sandbox. Once we enter the sandbox, we do not allow the prctl(2).

This has the nice design that the security is enforced on entering the
sandbox, and prior to entering the sandbox, no permissions need be given.

Let me know if that makes sense and if you had any other questions. thanks,

-Joel

  reply	other threads:[~2021-04-18  3:53 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-01 13:10 [PATCH 0/9] sched: Core scheduling interfaces Peter Zijlstra
2021-04-01 13:10 ` [PATCH 1/9] sched: Allow sched_core_put() from atomic context Peter Zijlstra
2021-04-01 13:10 ` [PATCH 2/9] sched: Implement core-sched assertions Peter Zijlstra
2021-04-01 13:10 ` [PATCH 3/9] sched: Trivial core scheduling cookie management Peter Zijlstra
2021-04-01 20:04   ` Josh Don
2021-04-02  7:13     ` Peter Zijlstra
2021-04-01 13:10 ` [PATCH 4/9] sched: Default core-sched policy Peter Zijlstra
2021-04-21 13:33   ` Peter Zijlstra
2021-04-21 14:31     ` Chris Hyser
2021-04-01 13:10 ` [PATCH 5/9] sched: prctl() core-scheduling interface Peter Zijlstra
2021-04-07 17:00   ` Peter Zijlstra
2021-04-18  3:52     ` Joel Fernandes [this message]
2021-04-01 13:10 ` [PATCH 6/9] kselftest: Add test for core sched prctl interface Peter Zijlstra
2021-04-01 13:10 ` [PATCH 7/9] sched: Cgroup core-scheduling interface Peter Zijlstra
2021-04-02  0:34   ` Josh Don
2021-04-01 13:10 ` [PATCH 8/9] rbtree: Remove const from the rb_find_add() comparator Peter Zijlstra
2021-04-01 13:10 ` [PATCH 9/9] sched: prctl() and cgroup interaction Peter Zijlstra
2021-04-03  1:30   ` Josh Don
2021-04-06 15:12     ` Peter Zijlstra
2021-04-04 23:39 ` [PATCH 0/9] sched: Core scheduling interfaces Tejun Heo
2021-04-05 18:46   ` Joel Fernandes
2021-04-06 14:16     ` Tejun Heo
2021-04-18  1:35       ` Joel Fernandes
2021-04-19  9:00         ` Peter Zijlstra
2021-04-21 13:35           ` Peter Zijlstra
2021-04-21 14:45             ` Chris Hyser
2021-04-06 15:32   ` Peter Zijlstra
2021-04-06 16:08     ` Tejun Heo
2021-04-07 18:39       ` Peter Zijlstra
2021-04-07 16:50   ` Michal Koutný
2021-04-07 18:34     ` Peter Zijlstra
2021-04-08 13:25       ` Michal Koutný
2021-04-08 15:02         ` Peter Zijlstra
2021-04-09  0:16           ` Josh Don
2021-04-19 11:30       ` Tejun Heo
2021-04-20  1:17         ` Josh Don

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