From: Cyrill Gorcunov <gorcunov@openvz.org>
To: richard -rw- weinberger <richard.weinberger@gmail.com>
Cc: Pavel Emelyanov <xemul@parallels.com>,
"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: [kernel-hardening] Re: [PATCH v2] futex: mark get_robust_list as deprecated
Date: Fri, 3 Aug 2012 15:27:45 +0400 [thread overview]
Message-ID: <20120803112745.GC11952@moon> (raw)
In-Reply-To: <CAFLxGvw4j-pyinjywxaL2gQ-Akp9grDysNv7dfOJkaQ3EyDKLw@mail.gmail.com>
On Fri, Aug 03, 2012 at 01:19:24PM +0200, richard -rw- weinberger wrote:
> >>
> >> 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?
>
> Kees, you said get_robust_list() can be used to bypass ASLR.
> How? What makes it worse than /proc/pid/maps?
>
> If the robust list address itself is bad, removing get_robust_list()
> and putting the information into /proc is useless.
Look, the /proc entry might check for some CAP and do not allow
a regular user to fetch this address.
Cyrill
WARNING: multiple messages have this Message-ID (diff)
From: Cyrill Gorcunov <gorcunov@openvz.org>
To: richard -rw- weinberger <richard.weinberger@gmail.com>
Cc: Pavel Emelyanov <xemul@parallels.com>,
"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 15:27:45 +0400 [thread overview]
Message-ID: <20120803112745.GC11952@moon> (raw)
In-Reply-To: <CAFLxGvw4j-pyinjywxaL2gQ-Akp9grDysNv7dfOJkaQ3EyDKLw@mail.gmail.com>
On Fri, Aug 03, 2012 at 01:19:24PM +0200, richard -rw- weinberger wrote:
> >>
> >> 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?
>
> Kees, you said get_robust_list() can be used to bypass ASLR.
> How? What makes it worse than /proc/pid/maps?
>
> If the robust list address itself is bad, removing get_robust_list()
> and putting the information into /proc is useless.
Look, the /proc entry might check for some CAP and do not allow
a regular user to fetch this address.
Cyrill
next prev parent reply other threads:[~2012-08-03 11:27 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-19 23:12 [kernel-hardening] [PATCH] futex: do not leak robust list to unprivileged process Kees Cook
2012-03-19 23:12 ` Kees Cook
2012-03-20 13:31 ` [kernel-hardening] " Serge Hallyn
2012-03-20 13:31 ` Serge Hallyn
2012-03-20 17:02 ` [kernel-hardening] " Thomas Gleixner
2012-03-20 17:02 ` Thomas Gleixner
2012-03-20 17:11 ` [kernel-hardening] " Kees Cook
2012-03-20 17:11 ` Kees Cook
2012-03-20 17:23 ` [kernel-hardening] " Ingo Molnar
2012-03-20 17:23 ` Ingo Molnar
2012-03-22 23:46 ` [kernel-hardening] " Thomas Gleixner
2012-03-22 23:46 ` Thomas Gleixner
2012-03-23 17:58 ` [kernel-hardening] [PATCH] futex: mark get_robust_list as deprecated Kees Cook
2012-03-23 17:58 ` Kees Cook
2012-03-23 18:27 ` [kernel-hardening] " Thomas Gleixner
2012-03-23 18:27 ` Thomas Gleixner
2012-03-23 19:08 ` [kernel-hardening] " Kees Cook
2012-03-23 19:08 ` Kees Cook
2012-03-23 19:08 ` [kernel-hardening] [PATCH v2] " Kees Cook
2012-03-23 19:08 ` Kees Cook
[not found] ` <20120323190855.GA27213-0X9Bc/hWBUTk6RaD4rd5nQ@public.gmane.org>
2012-03-23 22:06 ` Eric W. Biederman
2012-03-23 22:06 ` Eric W. Biederman
2012-03-23 22:06 ` [kernel-hardening] " Eric W. Biederman
[not found] ` <m1fwczvuph.fsf-+imSwln9KH6u2/kzUuoCbdi2O/JbrIOy@public.gmane.org>
2012-03-23 22:10 ` Kees Cook
2012-03-23 22:10 ` Kees Cook
2012-03-23 22:10 ` [kernel-hardening] " Kees Cook
2012-03-30 5:05 ` Matt Helsley
2012-03-30 5:05 ` Matt Helsley
2012-03-30 5:05 ` [kernel-hardening] " Matt Helsley
[not found] ` <20120330050544.GA32299-52DBMbEzqgQ/wnmkkaCWp/UQ3DHhIser@public.gmane.org>
2012-03-30 6:14 ` Pavel Emelyanov
2012-03-30 6:14 ` Pavel Emelyanov
2012-03-30 6:14 ` [kernel-hardening] " Pavel Emelyanov
2012-03-30 22:51 ` Gene Cooperman
2012-03-30 22:51 ` [kernel-hardening] " Gene Cooperman
2012-03-30 22:51 ` Gene Cooperman
2012-03-27 18:05 ` [kernel-hardening] " Josh Boyer
2012-03-27 18:05 ` Josh Boyer
2012-03-27 19:13 ` [kernel-hardening] " Peter Zijlstra
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 ` [kernel-hardening] Re: [PATCH v2] futex: mark " richard -rw- weinberger
2012-08-02 10:35 ` richard -rw- weinberger
2012-08-02 11:11 ` [kernel-hardening] " Eric W. Biederman
2012-08-02 11:11 ` Eric W. Biederman
2012-08-03 10:17 ` [kernel-hardening] " richard -rw- weinberger
2012-08-03 10:17 ` richard -rw- weinberger
2012-08-03 11:02 ` [kernel-hardening] " Cyrill Gorcunov
2012-08-03 11:02 ` Cyrill Gorcunov
2012-08-03 11:19 ` [kernel-hardening] " richard -rw- weinberger
2012-08-03 11:19 ` richard -rw- weinberger
2012-08-03 11:27 ` Cyrill Gorcunov [this message]
2012-08-03 11:27 ` Cyrill Gorcunov
2012-08-03 11:30 ` [kernel-hardening] " richard -rw- weinberger
2012-08-03 11:30 ` richard -rw- weinberger
2012-08-03 11:35 ` [kernel-hardening] " Cyrill Gorcunov
2012-08-03 11:35 ` Cyrill Gorcunov
2012-08-03 11:38 ` [kernel-hardening] " richard -rw- weinberger
2012-08-03 11:38 ` richard -rw- weinberger
2012-08-03 12:38 ` [kernel-hardening] " Pavel Emelyanov
2012-08-03 12:38 ` Pavel Emelyanov
2012-08-03 12:58 ` [kernel-hardening] " Eric W. Biederman
2012-08-03 12:58 ` Eric W. Biederman
2012-08-03 13:00 ` [kernel-hardening] " richard -rw- weinberger
2012-08-03 13:00 ` richard -rw- weinberger
2012-08-03 17:16 ` [kernel-hardening] " Kees Cook
2012-08-03 17:16 ` Kees Cook
2012-08-03 18:06 ` [kernel-hardening] [PATCH] Revert "futex: Mark get_robust_list as deprecated" Richard Weinberger
2012-03-28 18:33 ` [kernel-hardening] Re: [PATCH] futex: do not leak robust list to unprivileged process Kees Cook
2012-03-28 18:33 ` Kees Cook
2012-03-28 21:24 ` [kernel-hardening] " Thomas Gleixner
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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