[Bug 1820798] Re: hardening-check: add support for detecting stack clash protected binaries

[Alex Murray]

The attached should is more robust to optimisation in gcc and is updated
against the latest devscripts in disco

** Patch added: "devscripts_2.19.4ubuntu0.1.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/devscripts/+bug/1820798/+attachment/5254407/+files/devscripts_2.19.4ubuntu0.1.debdiff

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Title:
  hardening-check: add support for detecting stack clash protected
  binaries

Status in devscripts package in Ubuntu:
  New

Bug description:
  The security team is in the process of making -fstack-clash-protection
  enabled by default in gcc-8/9 for 19.10 / 20.04. To support this it is
  useful to be able to detect binaries which include this new feature
  via hardening-check. Unlike previous features this can only be
  detected by looking for the sequence of instructions which perform
  this feature in the disassembly output via objdump.

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