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Date: Wed, 24 Oct 2018 14:30:36 +0000
From: Jordan Glover <Golden_Miller83@...tonmail.ch>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Cc: Andrew Sandoval <ASandoval@...root.com>, "solar@...nwall.com" <solar@...nwall.com>
Subject: Re: GCC Compiler Induced Vulnerability - affects programs compiled with GCC 7 and 8 containing nested functions
‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Tuesday, October 23, 2018 3:35 PM, Solar Designer <solar@...nwall.com> wrote:
>
> Here's a list of maybe-actionable items I came up with in response to
> Webroot's findings/reminder:
>
> 1. More distros should start checking for executable stacks in program
> binaries at package build time, and error out when this is unexpected.
>
> 2. On Linux, we might want to have an enforcing mode (or several
> sub-modes) in the kernel, where it'd keep the stack non-executable (and
> possibly enforce W^X for other mappings as well), ignoring any flags in
> the program binaries. I encouraged Vasiliy Kulikov to implement that
> when he worked with us under GSoC 2011 on Linux kernel hardening tasks.
> Here's the relevant thread, including a kernel patch:
>
> https://www.openwall.com/lists/kernel-hardening/2011/07/18/8
>
> For GCC trampolines to continue working, we can implement emulation of
> the trampoline instructions like I introduced in -ow patches for 2.2.x
> and like it's done in PaX/grsecurity. Vasiliy's patch includes that
> (using code from PaX).
>
> IIRC, we never actually submitted this upstream. Maybe the current
> kernel hardening project (KSPP) should take and complete this effort.
>
There is S.A.R.A LSM[0] proposed by Salvatore Mesoraca with the aim to upstream
it to mainline kernel when needed infrastructure for it will be ready.
[0] https://sara.smeso.it/en/latest/
Jordan
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