On Thu, Dec 31, 2015 at 03:08:53PM +0900, Tetsuo Handa wrote:
> Willy Tarreau wrote:
> > On Wed, Dec 30, 2015 at 09:58:42AM +0100, Hannes Frederic Sowa wrote:
> > > The MSG_PEEK code should not be harmful and the patch is good as is. I
> > > first understood from the published private thread, that it is possible
> > > for a program to exceed the rlimit of fds. But the DoS is only by
> > > keeping the fds in flight and not attaching them to any program.
> >
> > Exactly. The real issue is when these FDs become very expensive such as
> > pipes full of data.
> >
>
> As you wrote how to abuse this vulnerability which exists in Linux 2.0
> and later kernel, I quote a short description from private thread.
>
> "an unprivileged user consumes all file descriptors so that other
> unprivileged user cannot work" and "an unprivileged user consumes all
> kernel memory so that the OOM killer kills almost all processes before
> the culprit process is killed (CVE-2013-4312)".
>
> Reported-by: Tetsuo Handa <penguin-ker...@i-love.sakura.ne.jp>
> Mitigates: CVE-2013-4312 (Linux 2.0+)
Well I didn't reveal any secret as it was publicly reported first
in 2010, it's only that Mark sent us the proof of concept exploit
on the security list recently :-)
https://bugzilla.kernel.org/show_bug.cgi?id=20402
Anyway I'll resend the patch with your reported-by, the CVE and
Hannes' ACK.
Thanks!
Willy
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