Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series..) | KernelTrap

Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series..)

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From: Al Viro <viro@...>

To: Ingo Molnar <mingo@...>

Cc: Linus Torvalds <torvalds@...>, Linux Kernel Mailing List <linux-kernel@...>, Greg KH <gregkh@...>, Peter Zijlstra <a.p.zijlstra@...>

Subject: Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series..)

Date: Wednesday, October 3, 2007 - 10:26 am

On Wed, Oct 03, 2007 at 04:08:42PM +0200, Ingo Molnar wrote:
quoted text> > Charming...  So we get d_path() either returning junk or we get 
> > something that isn't NUL-terminated.  Which one it is?  I.e. what does 
> > p look like and what's in s?
> 
> could be use-after-free as well, as CONFIG_PAGEALLOC was enabled.

Umm...  d_path() had just written there, so use-after-free is not too
likely to trigger page fault on read immediately afterwards - you'd
need a pretty tight race to hit it.
-
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Messages in current thread:

Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Linus Torvalds, (Mon Oct 1, 11:41 pm)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Timo Jantunen, (Wed Oct 3, 10:21 am)

[BUG] Linux 2.6.23-rc9 and MAX_ARG_PAGES, Mathieu Chouquet-Stringer..., (Thu Oct 4, 1:05 pm)

Re: [BUG] Linux 2.6.23-rc9 and MAX_ARG_PAGES, Bill Davidsen, (Sat Oct 6, 1:36 pm)

Re: [BUG] Linux 2.6.23-rc9 and MAX_ARG_PAGES, Hans-Peter Jansen, (Sat Oct 6, 4:29 am)

Re: [BUG] Linux 2.6.23-rc9 and MAX_ARG_PAGES, Hans-Peter Jansen, (Sat Oct 6, 7:29 am)

Re: [BUG] Linux 2.6.23-rc9 and MAX_ARG_PAGES, Chuck Ebbert, (Thu Oct 4, 5:50 pm)

Re: [BUG] Linux 2.6.23-rc9 and MAX_ARG_PAGES, Mathieu Chouquet-Stringer..., (Thu Oct 4, 5:54 pm)

Re: [BUG] Linux 2.6.23-rc9 and MAX_ARG_PAGES, Linus Torvalds, (Thu Oct 4, 1:27 pm)

Re: [BUG] Linux 2.6.23-rc9 and MAX_ARG_PAGES, Mathieu Chouquet-Stringer..., (Thu Oct 4, 4:44 pm)

Re: [BUG] Linux 2.6.23-rc9 and MAX_ARG_PAGES, Linus Torvalds, (Thu Oct 4, 5:21 pm)

Re: [BUG] Linux 2.6.23-rc9 and MAX_ARG_PAGES, Paul Mackerras, (Thu Oct 4, 6:27 pm)

Re: [BUG] Linux 2.6.23-rc9 and MAX_ARG_PAGES, Linus Torvalds, (Thu Oct 4, 8:12 pm)

Re: [BUG] Linux 2.6.23-rc9 and MAX_ARG_PAGES, Mathieu Chouquet-Stringer..., (Thu Oct 4, 11:22 pm)

Re: [BUG] Linux 2.6.23-rc9 and MAX_ARG_PAGES, Peter Zijlstra, (Fri Oct 5, 3:43 am)

Re: [BUG] Linux 2.6.23-rc9 and MAX_ARG_PAGES, Peter Zijlstra, (Thu Oct 4, 1:17 pm)

Re: [BUG] Linux 2.6.23-rc9 and MAX_ARG_PAGES, Mathieu Chouquet-Stringer..., (Thu Oct 4, 5:58 pm)

Re: [BUG] Linux 2.6.23-rc9 and MAX_ARG_PAGES, Mathieu Chouquet-Stringer..., (Thu Oct 4, 4:47 pm)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Thomas Gleixner, (Tue Oct 2, 5:17 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Rafael J. Wysocki, (Tue Oct 2, 4:12 pm)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Andrew Morton, (Tue Oct 2, 4:11 pm)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Roland Dreier, (Tue Oct 2, 4:32 pm)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Rafael J. Wysocki, (Tue Oct 2, 4:31 pm)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Andi Kleen, (Tue Oct 2, 5:21 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Jiri Kosina, (Tue Oct 2, 8:04 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Jeff Garzik, (Tue Oct 2, 6:37 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Andi Kleen, (Tue Oct 2, 6:48 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Thomas Gleixner, (Tue Oct 2, 7:05 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Ingo Molnar, (Tue Oct 2, 10:07 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Andi Kleen, (Tue Oct 2, 10:23 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Ingo Molnar, (Tue Oct 2, 10:31 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Andi Kleen, (Tue Oct 2, 10:54 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Sam Ravnborg, (Tue Oct 2, 10:58 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Thomas Gleixner, (Tue Oct 2, 11:30 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Sam Ravnborg, (Tue Oct 2, 11:40 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Andi Kleen, (Tue Oct 2, 11:24 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Ingo Molnar, (Tue Oct 2, 11:27 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Eric St-Laurent, (Tue Oct 2, 11:53 pm)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Jeff Garzik, (Wed Oct 3, 3:07 pm)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Linus Torvalds, (Wed Oct 3, 3:25 pm)

[patch] net, 9p: build fix with !CONFIG_SYSCTL, Ingo Molnar, (Thu Oct 4, 7:55 am)

[bug] crash when reading /proc/mounts (was: Re: Linux 2.6.23..., Ingo Molnar, (Wed Oct 3, 4:46 am)

Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2...., Linus Torvalds, (Wed Oct 3, 11:11 am)

Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2...., Linus Torvalds, (Wed Oct 3, 11:47 am)

Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2...., Ingo Molnar, (Wed Oct 3, 11:49 am)

Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2...., Ingo Molnar, (Wed Oct 3, 12:07 pm)

Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2...., Adrian Bunk, (Thu Oct 4, 10:12 am)

Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2...., Alexey Dobriyan, (Thu Oct 4, 11:08 am)

Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2...., Alan Cox, (Wed Oct 3, 11:51 am)

Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2...., Linus Torvalds, (Wed Oct 3, 12:09 pm)

Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2...., Jan Engelhardt, (Wed Oct 3, 12:25 pm)

Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2...., Linus Torvalds, (Wed Oct 3, 1:07 pm)

Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2...., Ingo Molnar, (Wed Oct 3, 11:40 am)

Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2...., Linus Torvalds, (Wed Oct 3, 12:07 pm)

Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2...., Al Viro, (Wed Oct 3, 9:34 am)

Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2...., Ingo Molnar, (Wed Oct 3, 10:08 am)

Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2...., Al Viro, (Wed Oct 3, 10:26 am)

Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2...., Arjan van de Ven, (Wed Oct 3, 11:12 am)

Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2...., Ingo Molnar, (Wed Oct 3, 4:50 am)

Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2...., Ingo Molnar, (Wed Oct 3, 5:12 am)

Re: [bug] crash when reading /proc/mounts (was: Re: Linux 2...., Ingo Molnar, (Wed Oct 3, 5:23 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Diego Calleja, (Tue Oct 2, 7:07 pm)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Linus Torvalds, (Tue Oct 2, 7:32 pm)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Diego Calleja, (Wed Oct 3, 11:28 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Alistair John Strachan, (Tue Oct 2, 6:51 pm)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Ingo Molnar, (Fri Oct 5, 1:38 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Sam Ravnborg, (Fri Oct 5, 2:11 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Thomas Gleixner, (Fri Oct 5, 4:32 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Alistair John Strachan, (Sun Oct 7, 7:44 pm)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Glauber de Oliveira Costa..., (Tue Oct 2, 7:00 pm)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Ingo Molnar, (Fri Oct 5, 1:41 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Willy Tarreau, (Tue Oct 2, 6:44 pm)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., John Stoffel, (Tue Oct 2, 10:44 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Bill Davidsen, (Tue Oct 2, 6:13 pm)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Ingo Molnar, (Tue Oct 2, 11:03 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., John Stoffel, (Tue Oct 2, 11:45 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Mel Gorman, (Tue Oct 2, 8:07 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Ingo Molnar, (Tue Oct 2, 8:15 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Mel Gorman, (Tue Oct 2, 1:21 pm)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Bill Davidsen, (Tue Oct 2, 6:09 pm)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Mel Gorman, (Tue Oct 2, 8:37 pm)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Ingo Molnar, (Wed Oct 3, 4:21 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Mel Gorman, (Wed Oct 3, 8:51 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Ingo Molnar, (Mon Oct 22, 11:56 am)

Re: Linux 2.6.23-rc9 and a heads-up for the 2.6.24 series.., Ingo Molnar, (Wed Oct 3, 4:19 am)

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