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Date: Fri, 3 Aug 2012 12:17:43 +0200
Message-ID: <CAFLxGvz0reQS=zfWeTz4a4xZVFeeu80VnP-efy7zCiPZVWzH-g@mail.gmail.com>
Subject: Re: [PATCH v2] futex: mark get_robust_list as deprecated
From: richard -rw- weinberger <richard.weinberger@gmail.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Kees Cook <keescook@chromium.org>, Thomas Gleixner <tglx@linutronix.de>,
        linux-kernel@vger.kernel.org, Randy Dunlap <rdunlap@xenotime.net>,
        Darren Hart <dvhart@linux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Andrew Morton <akpm@linux-foundation.org>,
        Jiri Kosina <jkosina@suse.cz>, David Howells <dhowells@redhat.com>,
        "Serge E. Hallyn" <serge.hallyn@canonical.com>,
        linux-doc@vger.kernel.org, kernel-hardening@lists.openwall.com,
        spender@grsecurity.net, Pavel Emelyanov <xemul@parallels.com>,
        Cyrill Gorcunov <gorcunov@openvz.org>
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On Thu, Aug 2, 2012 at 1:11 PM, Eric W. Biederman <ebiederm@xmission.com> wrote:
> richard -rw- weinberger <richard.weinberger@gmail.com> writes:
>
>> On Fri, Mar 23, 2012 at 8:08 PM, Kees Cook <keescook@chromium.org> wrote:
>>> Notify get_robust_list users that the syscall is going away.
>>>
>>> Suggested-by: Thomas Gleixner <tglx@linutronix.de>
>>> Signed-off-by: Kees Cook <keescook@chromium.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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