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 proposed by Salvatore Mesoraca with the aim to upstream it to mainline kernel when needed infrastructure for it will be ready.  https://sara.smeso.it/en/latest/ Jordan
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