linux-kernel - Re: [PATCH] sched: Don't allow setuid to succeed if the user does not have rt bandwidth

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Message-ID: <20090227102512.GA14530@elte.hu>
Date:	Fri, 27 Feb 2009 11:25:12 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
Cc:	Chris Friesen <cfriesen@...tel.com>, mingo@...ux.vnet.ibm.com,
	Peter Zijlstra <peterz@...radead.org>,
	Andi Kleen <andi@...stfloor.org>,
	Corey Hickey <bugfood-ml@...ooh.org>,
	linux-kernel@...r.kernel.org,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Balbir Singh <balbir@...ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	mtk.manpages@...il.com, Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH] sched: Don't allow setuid to succeed if the user does
	not have rt bandwidth


* Dhaval Giani <dhaval@...ux.vnet.ibm.com> wrote:

> 
> Corey Hickey reported that on using setuid to change the uid of a
> rt process, the process would be unkillable and not be running.
> This is because there was no rt runtime for that user group. Add
> in a check to see if a user can attach an rt task to its task group.
> On failure, return EINVAL, which is also returned in
> CONFIG_CGROUP_SCHED.
> 
> Signed-off-by: Dhaval Giani <dhaval@...ux.vnet.ibm.com>
> Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> ---
>  include/linux/sched.h |    4 ++++
>  kernel/sched.c        |   13 +++++++++++--
>  kernel/sys.c          |   31 ++++++++++++++++++++-----------
>  kernel/user.c         |   18 ++++++++++++++++++
>  4 files changed, 53 insertions(+), 13 deletions(-)

Applied to tip:sched/urgent, thanks Dhaval!

	Ingo
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