[PATCH 3.8 106/116] x86_32, entry: Do syscall exit work on badsys (CVE-2014-4508)

[Greg KH]

On Tue, Jul 22, 2014 at 03:27:59PM -0700, Andy Lutomirski wrote:
> On Tue, Jul 22, 2014 at 3:21 PM, Kamal Mostafa <kamal at canonical.com> wrote:
> > 3.8.13.27 -stable review patch.  If anyone has any objections, please let me know.
> >
> > ------------------
> >
> > From: Andy Lutomirski <luto at amacapital.net>
> >
> > commit 554086d85e71f30abe46fc014fea31929a7c6a8a upstream.
> >
> > The bad syscall nr paths are their own incomprehensible route
> > through the entry control flow.  Rearrange them to work just like
> > syscalls that return -ENOSYS.
> >
> > This fixes an OOPS in the audit code when fast-path auditing is
> > enabled and sysenter gets a bad syscall nr (CVE-2014-4508).
> >
> > This has probably been broken since Linux 2.6.27:
> > af0575bba0 i386 syscall audit fast-path
> 
> Don't apply this without:
> 
> https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?h=x86/urgent&id=8142b215501f8b291a108a202b3a053a265b03dd
> 
> Sorry!

As that isn't in Linus's tree yet, don't apply that one either...

thanks,

greg k-h