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

[Steve Beattie]

It looks like the stack-clash detection is getting tripped up on
optimization:

ubuntu at stensal-disco-server-amd64:~$ gcc -O2 -o stack-clash -fstack-clash-protection  stack-clash.c
ubuntu at stensal-disco-server-amd64:~$ ./hardening-check ./stack-clash
./stack-clash:
 Position Independent Executable: yes
 Stack protected: yes
 Fortify Source functions: no, only unprotected functions found!
 Read-only relocations: yes
 Immediate binding: yes
 Stack clash protection: no, not found!
ubuntu at stensal-disco-server-amd64:~$ gcc -o stack-clash -fstack-clash-protection  stack-clash.c
ubuntu at stensal-disco-server-amd64:~$ ./hardening-check ./stack-clash
./stack-clash:
 Position Independent Executable: yes
 Stack protected: yes
 Fortify Source functions: no, only unprotected functions found!
 Read-only relocations: yes
 Immediate binding: yes
 Stack clash protection: yes

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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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