build: hardening flags

[leogr]

What type of PR is this?

/kind feature

Any specific area of the project related to this PR?

/area build

What this PR does / why we need it:

This PR explicitly sets common hardening flags to be used by default for building Falco.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

I have opted for -fstack-protector-strong over -fstack-protector-all to avoid any potential performance penalty (more info can be found 👉 here)

Tested with gdb-peda

gdb-peda$ checksec
CANARY    : ENABLED
FORTIFY   : ENABLED
NX        : ENABLED
PIE       : ENABLED
RELRO     : FULL

Does this PR introduce a user-facing change?:

build: enforcing hardening flags by default

[poiana]

LGTM label has been added.

Git tree hash: dbd93cf0c31416e740b6c8a61cd40bc6d522bff3

[leogr]

/hold
to let other PRs get merged

[leogr]

/hold

[leogr]

/honk

[poiana]

@leogr: Unable to find goose. Have you checked the garden?

In response to this:

/honk

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[leogr]

/hold cancel
/cc @fntlnz

[leogr]

/hold

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fntlnz, leodido

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [fntlnz,leodido]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[leogr]

/hold cancel