Date: Wed, 28 May 2014 15:03:55 -0700 From: Greg KH <greg@...ah.com> To: Andy Lutomirski <luto@...capital.net> Cc: oss-security@...ts.openwall.com Subject: Re: CVE request: Linux kernel DoS with syscall auditing On Wed, May 28, 2014 at 02:51:16PM -0700, Andy Lutomirski wrote: > On Wed, May 28, 2014 at 2:53 PM, Greg KH <greg@...ah.com> wrote: > > On Wed, May 28, 2014 at 02:45:59PM -0700, Andy Lutomirski wrote: > >> Issuing a system call with a random large number will OOPS, depending > >> on configuration. A configuration that will enable this bug is: > >> > >> # auditctl -a exit,always -S open > >> > >> No privilege whatsoever is required to trigger the OOPS. > >> > >> It's possible that this can be extended to more than just a DoS -- > >> with some care and willingness to exploit timing attacks, this is a > >> read of arbitrary single bits in kernel memory. > > > > Is there a kernel fix for this anywhere? > > No, but there will be soon. Great, I see the thread on lkml now, thanks for the heads up. > The correct fix is, IMO, CONFIG_AUDITSYSCALL=n. That code is garbage. No argument from me there... greg k-h
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