From: Cyrill Gorcunov <gorcunov@openvz.org>
To: richard -rw- weinberger <richard.weinberger@gmail.com>,
Pavel Emelyanov <xemul@parallels.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
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
Subject: Re: [PATCH v2] futex: mark get_robust_list as deprecated
Date: Fri, 3 Aug 2012 15:02:47 +0400 [thread overview]
Message-ID: <20120803110247.GB11952@moon> (raw)
In-Reply-To: <CAFLxGvz0reQS=zfWeTz4a4xZVFeeu80VnP-efy7zCiPZVWzH-g@mail.gmail.com>
On Fri, Aug 03, 2012 at 12:17:43PM +0200, richard -rw- weinberger wrote:
> 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?
Well, I believe we were over-optimistic in claiming that we don't need this
syscall (to be fair I think we simply yet not faced the problem Eric points).
So we need some way to fetch this address and set it back. If get_robust_list
get deprecated maybe we could print it out in /proc/pid/stat or something?
Cyrill
next prev parent reply other threads:[~2012-08-03 11:02 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-19 23:12 [PATCH] futex: do not leak robust list to unprivileged process Kees Cook
2012-03-20 13:31 ` Serge Hallyn
2012-03-20 17:02 ` Thomas Gleixner
2012-03-20 17:11 ` Kees Cook
2012-03-20 17:23 ` Ingo Molnar
2012-03-22 23:46 ` Thomas Gleixner
2012-03-23 17:58 ` [PATCH] futex: mark get_robust_list as deprecated Kees Cook
2012-03-23 18:27 ` Thomas Gleixner
2012-03-23 19:08 ` Kees Cook
2012-03-23 19:08 ` [PATCH v2] " Kees Cook
2012-03-23 22:06 ` Eric W. Biederman
2012-03-23 22:10 ` Kees Cook
2012-03-30 5:05 ` Matt Helsley
2012-03-30 6:14 ` Pavel Emelyanov
2012-03-30 22:51 ` Gene Cooperman
2012-03-27 18:05 ` Josh Boyer
2012-03-27 19:13 ` Peter Zijlstra
2012-03-29 9:56 ` [tip:core/locking] futex: Mark " tip-bot for Kees Cook
2012-08-02 10:35 ` [PATCH v2] futex: mark " richard -rw- weinberger
2012-08-02 11:11 ` Eric W. Biederman
2012-08-03 10:17 ` richard -rw- weinberger
2012-08-03 11:02 ` Cyrill Gorcunov [this message]
2012-08-03 11:19 ` richard -rw- weinberger
2012-08-03 11:27 ` Cyrill Gorcunov
2012-08-03 11:30 ` richard -rw- weinberger
2012-08-03 11:35 ` Cyrill Gorcunov
2012-08-03 11:38 ` richard -rw- weinberger
2012-08-03 12:38 ` Pavel Emelyanov
2012-08-03 12:58 ` Eric W. Biederman
2012-08-03 13:00 ` richard -rw- weinberger
2012-08-03 17:16 ` Kees Cook
2012-03-28 18:33 ` [PATCH] futex: do not leak robust list to unprivileged process Kees Cook
2012-03-28 21:24 ` Thomas Gleixner
2012-03-29 9:55 ` [tip:core/locking] futex: Do " tip-bot for Kees Cook
2012-06-19 1:41 ` Wanlong Gao
2012-06-19 2:24 ` Serge Hallyn
2012-06-19 2:32 ` Wanlong Gao
2012-06-19 3:13 ` Serge Hallyn
2012-06-19 3:21 ` Wanlong Gao
2012-06-19 12:23 ` Serge Hallyn
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