kafs-client (recent strangeness of with add_key)

[Spencer Olson]

Ok, so I took the suggestions from Chaskiel, implemented them and
pushed my changes to my repository on GitHub.  Using this right now
with no issues yet.

On Tue, May 31, 2022 at 8:24 AM Chaskiel Grundman <cgrundman at gmail.com> wrote:
>
> The KEY_SPEC_USER_SESSION_KEYRING exists to be the fallback
> KEY_SPEC_SESSION_KEYRING.
>
> From user-session-keyring.7:
> > The user session keyring is created on demand when a thread requests it or when a thread asks for its session-keyring(7) and that keyring doesn't exist. In the latter case, a user session keyring will be created and, ***if the session keyring wasn't to be created, the user session keyring will be set as the process's actual session keyring***
>
>
> You can try it yourself, with keyctl show
> Compare
> keyctl show @s
> keyctl show @us
> and keyctl session -- keyctl show @s
>
> the strace shows (session present)
> keyctl(KEYCTL_GET_KEYRING_ID, KEY_SPEC_SESSION_KEYRING, 0) = 66825801
> keyctl(KEYCTL_DESCRIBE, 66825801, NULL, 0) = 32
> keyctl(KEYCTL_DESCRIBE, 66825801, "keyring;1000;1000;3f030000;_ses", 32) = 32
>
> vs (session not present)
> keyctl(KEYCTL_GET_KEYRING_ID, KEY_SPEC_SESSION_KEYRING, 0) = 634641843
> keyctl(KEYCTL_DESCRIBE, 634641843, NULL, 0) = 42
> keyctl(KEYCTL_DESCRIBE, 634641843,
> "keyring;1000;65534;1f3f0000;_uid"..., 42) = 42