lkml.org 
[lkml]   [2018]   [Jun]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 00/10] Control Flow Enforcement - Part (3)
From
Date
On Mon, 2018-06-25 at 22:26 -0700, Andy Lutomirski wrote:
> On Thu, Jun 7, 2018 at 7:41 AM Yu-cheng Yu <yu-cheng.yu@intel.com>
> wrote:
> >
> >
> > This series introduces CET - Shadow stack
> I think you should add some mitigation against sigreturn-oriented
> programming.  How about creating some special token on the shadow
> stack that indicates the presence of a signal frame at a particular
> address when delivering a signal and verifying and popping that token
> in sigreturn?  The token could be literally the address of the signal
> frame, and you could make this unambiguous by failing sigreturn if
> CET
> is on and the signal frame is in executable memory.
>
> IOW, it would be a shame if sigreturn() itself became a convenient
> CET-bypassing gadget.
>
> --Andy

I will look into that.

Thanks,
Yu-cheng

\
 
 \ /
  Last update: 2018-06-26 17:01    [W:0.299 / U:0.164 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site