Date: Fri, 3 Aug 2012 13:19:24 +0200 From: richard -rw- weinberger <richard.weinberger@...il.com> To: Cyrill Gorcunov <gorcunov@...nvz.org> Cc: Pavel Emelyanov <xemul@...allels.com>, "Eric W. Biederman" <ebiederm@...ssion.com>, 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 Subject: Re: [PATCH v2] futex: mark get_robust_list as deprecated On Fri, Aug 3, 2012 at 1:02 PM, Cyrill Gorcunov <gorcunov@...nvz.org> wrote: >> >> 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? 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. -- Thanks, //richard
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