From: Jakub Jelinek <jakub@redhat.com>
To: Andrew Morton <akpm@osdl.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>,
mingo@elte.hu, linux-kernel@vger.kernel.org, torvalds@osdl.org,
virtualization@lists.osdl.org, kraxel@suse.de, zach@vmware.com
Subject: Re: [PATCH] Gerd Hoffman's move-vsyscall-into-user-address-range patch
Date: Mon, 22 May 2006 12:29:49 -0400 [thread overview]
Message-ID: <20060522162949.GG30682@devserv.devel.redhat.com> (raw)
In-Reply-To: <20060519174303.5fd17d12.akpm@osdl.org>
On Fri, May 19, 2006 at 05:43:03PM -0700, Andrew Morton wrote:
> Rusty Russell <rusty@rustcorp.com.au> wrote:
> >
> > Name: Move vsyscall page out of fixmap into normal vma as per mmap
>
> This causes mysterious hangs when starting init.
>
> Distro is RH FC1, running SysVinit-2.85-5.
>
> dmesg, sysrq-T and .config are at
> http://www.zip.com.au/~akpm/linux/patches/stuff/log-vmm - nothing leaps
> out.
>
> This is the second time recently when a patch has caused this machine to
> oddly hang in init. It's possible that there's a bug of some form in that
> version of init that we'll need to know about and take care of in some
> fashion.
That's known bug in early glibcs short after adding vDSO support.
The vDSO support has been added in May 2003 to CVS glibc (i.e. post glibc
2.3.2) and the problems have been fixed when they were discovered, in
February 2004:
http://sources.redhat.com/ml/libc-hacker/2004-02/msg00053.html
http://sources.redhat.com/ml/libc-hacker/2004-02/msg00059.html
I strongly believe we want randomized vDSOs, people are already abusing the
fix mapped vDSO for attacks, and I think the unfortunate 10 months of broken
glibc shouldn't stop that forever. Anyone using such glibc can still use
vdso=0, or do that just once and upgrade to somewhat more recent glibc.
Jakub
next prev parent reply other threads:[~2006-05-22 16:30 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-16 6:03 [PATCH] Gerd Hoffman's move-vsyscall-into-user-address-range patch Rusty Russell
2006-05-16 6:47 ` Ingo Molnar
2006-05-16 8:16 ` Zachary Amsden
2006-05-16 8:40 ` Chris Wright
2006-05-16 8:59 ` Zachary Amsden
2006-05-17 7:49 ` Rusty Russell
2006-05-18 7:54 ` Ingo Molnar
2006-05-18 8:29 ` Gerd Hoffmann
2006-05-20 0:43 ` Andrew Morton
2006-05-20 1:03 ` Ingo Molnar
2006-05-20 1:11 ` Andrew Morton
2006-05-20 1:15 ` Linus Torvalds
2006-05-20 8:53 ` [patch] i386, vdso=[0|1] boot option and /proc/sys/vm/vdso_enabled Ingo Molnar
2006-05-20 9:26 ` Andrew Morton
2006-05-20 9:30 ` Zachary Amsden
2006-05-20 9:43 ` Zachary Amsden
2006-05-20 9:48 ` Andrew Morton
2006-05-20 10:04 ` Zachary Amsden
2006-05-21 4:38 ` Rusty Russell
2006-05-21 9:35 ` Rusty Russell
2006-05-21 9:52 ` Andrew Morton
2006-05-21 10:41 ` Ingo Molnar
2006-05-21 11:06 ` Rusty Russell
2006-05-20 9:54 ` Ingo Molnar
2006-05-20 10:16 ` [patch] add print_fatal_signals support Ingo Molnar
2006-05-21 11:03 ` [patch] i386, vdso=[0|1] boot option and /proc/sys/vm/vdso_enabled Ingo Molnar
2006-05-21 11:38 ` Ingo Molnar
2006-05-21 12:33 ` Andrew Morton
2006-05-21 14:10 ` Arjan van de Ven
2006-05-22 14:32 ` Alexey Kuznetsov
2006-05-20 1:16 ` [PATCH] Gerd Hoffman's move-vsyscall-into-user-address-range patch Zachary Amsden
2006-05-20 1:49 ` Andi Kleen
2006-05-20 1:24 ` Arjan van de Ven
2006-05-22 16:29 ` Jakub Jelinek [this message]
2006-05-22 16:44 ` Zachary Amsden
2006-05-22 17:14 ` Andrew Morton
2006-05-22 17:27 ` Ingo Molnar
2006-05-22 17:46 ` Linus Torvalds
2006-05-22 19:09 ` Ingo Molnar
2006-05-22 19:40 ` Linus Torvalds
2006-05-22 19:14 ` Adrian Bunk
2006-05-22 19:45 ` Linus Torvalds
2006-05-22 17:53 ` Andrew Morton
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