fix(driver): use extract__egid instread of extract__euid helper

[Andreagit97]

What type of PR is this?

/kind bug

Any specific area of the project related to this PR?

/area driver-modern-bpf

Does this PR require a change in the driver versions?

No

What this PR does / why we need it:

This PR fixes some typos, we need to extract the gid instead of the uid

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[poiana]

LGTM label has been added.

Git tree hash: fe646a4564081b1eb1d14af058ee5c3188702aad

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Andreagit97, gnosek, hbrueckner

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[dwindsor]

Nice! I assumed that since gid_t and uid_t are basically the same, that extract__euid would work! I assume that this will now be used in the getegid() modern probe?

[Andreagit97]

I assume that this will now be used in the getegid() modern probe?

@dwindsor If you mean in the syscall getegid, the implementation you have done in #776 is correct! We are instrumenting the getegid syscall so we have direct access to the gid_t since it is the return value of the syscall. In this PR I have to use these helpers because we are trying to extract the git_t directly from the kernel and not from the syscall params. Let me know if this is not clear :)