On Thu, 31 Dec 2015 08:12:53 +0100 Willy Tarreau <w...@1wt.eu> wrote:
> 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 :-) There were demonstrations of this bug posted for BSD unixes before Linux even existed. It and "run the box out of socket buffers" are older than Linux 8) Alan -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
