config check is NOT PASSED: 33 errors

As requested by a13xp0p0v.

config check is NOT PASSED: 49 errors

config check is NOT PASSED: 49 errors

Linux historical interest is not secure ;)

Conflicts resolved by @a13xp0p0v

Conflicts resolved by @a13xp0p0v:

Also print the value of the unknown option

That will change the check result
  FAIL: "not found"
onto initial
  FAIL: not found

This improves the opt storage using a kconfig key based dict to
avoid looping through all opts to get a certain entry by allowing
key based lookups.

Carefully extracted from their last public patch

STRICT_DEVMEM and IO_STRICT_DEVMEM, SECCOMP and SECCOMP_FILTER
are not self protection features. They cut attack surface.

I'm also not sure about SYN_COOKIES. Mark it with a comment.

It is needed only for kernels prior to v4.11 (Kees has updated the wiki)

Thanks to @Bernhard40 for the correction

Signed-off-by: Alexander Popov <alex.popov@linux.com>

This script helps me to check the Linux kernel Kconfig option list
against my hardening preferences for x86_64.

Nobody likes checking configs manually. Let the computers do their job!

Signed-off-by: Alexander Popov <alex.popov@linux.com>