linux-kernel - Re: [PATCH v2] futex: mark get_robust

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Date:	Fri, 3 Aug 2012 12:17:43 +0200
From:	richard -rw- weinberger <richard.weinberger@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Kees Cook <keescook@...omium.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Randy Dunlap <rdunlap@...otime.net>,
	Darren Hart <dvhart@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>,
	David Howells <dhowells@...hat.com>,
	"Serge E. Hallyn" <serge.hallyn@...onical.com>,
	linux-doc@...r.kernel.org, kernel-hardening@...ts.openwall.com,
	spender@...ecurity.net, Pavel Emelyanov <xemul@...allels.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: Re: [PATCH v2] futex: mark get_robust_list as deprecated

On Thu, Aug 2, 2012 at 1:11 PM, Eric W. Biederman <ebiederm@...ssion.com> wrote:
> richard -rw- weinberger <richard.weinberger@...il.com> writes:
>
>> On Fri, Mar 23, 2012 at 8:08 PM, Kees Cook <keescook@...omium.org> wrote:
>>> Notify get_robust_list users that the syscall is going away.
>>>
>>> Suggested-by: Thomas Gleixner <tglx@...utronix.de>
>>> Signed-off-by: Kees Cook <keescook@...omium.org>
>>> ---
>>
>> I'm using this system call in an application and noticed that's marked
>> as deprecated now.
>> My application collects all kind of information from crashing programs.
>> It's installed in /proc/sys/kernel/core_pattern.
>>
>> If program X is crashing it executes get_robust_list(X) to get the
>> address of the robust list
>> and reads the list from /proc/X/mem.
>>
>> Is there another way to get the robust list from another program (by it's pid)?
>
> The folks doing checkpoint/restart claim to not need this, so there
> might be a way either that or they just haven't hit this problem yet.
>
> What you are doing sounds like a reasonable use of get_robust_list to me.
>

CRIU folks, how do you deal with futex robust lists?

-- 
Thanks,
//richard
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