feat: add a syscall allow list in the SPOD configuration

[ccojocar]

What type of PR is this?

What this PR does / why we need it:

Add a syscall allow list in the SPOD configuration. This is to allow an administrator to limit cluster-wide the syscalls which are allowed to be defined in the seccomp profiles.

Which issue(s) this PR fixes:

Fixes #897

Does this PR have test?

Yes

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Yes

Add a syscall allow list in the SPOD configuration

[k8s-ci-robot]

Hi @ccojocar. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[codecov-commenter]

Codecov Report

Merging #913 (40b2d6b) into main (72a0786) will decrease coverage by 0.15%.
The diff coverage is 44.03%.

@@            Coverage Diff             @@
##             main     #913      +/-   ##
==========================================
- Coverage   50.64%   50.49%   -0.16%     
==========================================
  Files          42       42              
  Lines        4626     4735     +109     
==========================================
+ Hits         2343     2391      +48     
- Misses       2198     2259      +61     
  Partials       85       85              

[ccojocar]

/test build

[k8s-ci-robot]

@ccojocar: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/test build

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[JAORMX]

/ok-to-test

[saschagrunert]

@ccojocar may I ask you to give this one a rebase?

[ccojocar]

@saschagrunert All tests passed after rebasing, please could you have a look? Thanks

[saschagrunert]

Hm, the code changes look good from what I can see.

Can we add docs to the installation and usage guide to describe the feature? I'm curious how it behaves if we change the allowed syscalls for already deployed profiles (we cannot remove them when they're in usage).

[ccojocar]

Thanks for review @saschagrunert! I added some documentation which explains how to use the allow syscalls list.

I'm curious how it behaves if we change the allowed syscalls for already deployed profiles (we cannot remove them when they're in usage).

There is an e2e test for this, namely testCaseAllowedSyscallsInUse which essentially removes some syscall from the spod config at runtime while one of the non compliant profile is in use. This will result in the operator removing the profile as soon as the pod referencing the profile terminates.

[ccojocar]

/test all

[saschagrunert]

LGTM

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ccojocar, saschagrunert

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[ccojocar]

/test all

[ccojocar]

/test all