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

[Mattia Rizzolo]

Could you please submit this in the form of a MR against
https://salsa.debian.org/debian/devscripts ?

I would be happy to review and merge such contribution once an MR is
opened there (as a first look the patch doesn't look crazy, but I would
need to look deeper - I'm not familiar with that particular script).

The hardening-check script does not have a test suite, but if you could
also consider contributing one (since it's perl, just add a test/t
/hardening-checks.t using Test::More) it would be really awesome (not
required to get this patch merged, though)

Also, I would love if you could refrain from uploading such diffs to
Ubuntu, given that I'm open to get such changes in Debian directly
(removing ~ubuntu-sponsors as such…)

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https://bugs.launchpad.net/bugs/1820798

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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