From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with ESMTP id 800BB6001DA for ; Thu, 28 Jan 2010 16:59:36 -0500 (EST) Date: Thu, 28 Jan 2010 13:58:33 -0800 (PST) From: Linus Torvalds Subject: Re: [Security] DoS on x86_64 In-Reply-To: <2BCD2997-7101-4BFF-82CC-A5EC2F4F8E9E@googlemail.com> Message-ID: References: <144AC102-422A-4AA3-864D-F90183837EA3@googlemail.com> <2BCD2997-7101-4BFF-82CC-A5EC2F4F8E9E@googlemail.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org To: Mathias Krause Cc: Thomas Gleixner , Ingo Molnar , linux-mm@kvack.org, security@kernel.org List-ID: On Thu, 28 Jan 2010, Mathias Krause wrote: > > I don't get a core-dump, even though it says I do: > > > > [torvalds@nehalem amd64_killer]$ ./run.sh > > * look at /proc/22768/maps and press enter to continue... > > * executing ./poison... > > * that failed (No such file or directory), as expected :) > > * look at /proc/22768/maps and press enter to continue... > > Have you looked at /proc/PID/maps at this point? On our machine the [vdso] was > gone and [vsyscall] was there instead -- at an 64 bit address of course. Yup. That's the behavior I see - except I see the [vdso] thing in both cases. So I agree that it has become a 64-bit process, and that the whole personality crap is buggy. I just don't see the crash. > Since this is a production server I would rather stick to a stable kernel and > just pick the commit that fixes the issue. Can you please tell me which one > that may be? I'd love to be able to say that it's been fixed in so-and-so, but since I don't know what the oops is, I have a hard time even guessing _whether_ it has actually been fixed or not, or whether the reason I don't see it is something else totally unrelated. Linus -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org