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https://issues.apache.org/jira/browse/SLING-4461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14353004#comment-14353004
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Carsten Ziegeler commented on SLING-4461:
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The problem I see with this is, while you specify (subServiceName="theName"),
this reference might never be satisfied. However the service user lookup passes
due to the fallbacks.
Therefore I think we should treat either remove the fallbacks or treat
subServiceName="theName") as
"|((!(subServiceName=*))(subServiceName=theName))" - which is not possible with
the hooks (you can only shrink the selection).
Regardless of the references, this has also the problem mentioned by Marius -
that you get a service user when no mapping is defined and are not updated if
such a specific mapping is defined later on.
> Remove fallbacks for service users resolution
> ---------------------------------------------
>
> Key: SLING-4461
> URL: https://issues.apache.org/jira/browse/SLING-4461
> Project: Sling
> Issue Type: Improvement
> Components: Service User Mapper
> Reporter: Marius Petria
> Fix For: Service User Mapper 1.1.2
>
>
> ServiceUserMapperImpl has several levels of fallback for service user
> resolution (fallback to bundle default, or to global default). While this
> offers a lot of flexibility, it introduces non-determinism in a security
> feature. If defaults are set, it can happen (especially at startup) that code
> is executed using different serviceUsers, e.g. a component can execute using
> the bundle default or global default until its specific subService is
> available, and it can be easily imagined how this can cause subtle errors.
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