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https://issues.apache.org/jira/browse/SOLR-5617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13864505#comment-13864505
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Shawn Heisey commented on SOLR-5617:
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I will have to double-check, but I probably have the specifics that required me
to turn off the safety checking wrong. It may have been configuration
components gathered via xinclude, not jarfiles. Either way, I am sure that
everything is under the solr home.
> Default classloader restrictions may be too tight
> -------------------------------------------------
>
> Key: SOLR-5617
> URL: https://issues.apache.org/jira/browse/SOLR-5617
> Project: Solr
> Issue Type: Bug
> Affects Versions: 4.6
> Reporter: Shawn Heisey
> Labels: security
> Fix For: 5.0, 4.7
>
>
> SOLR-4882 introduced restrictions for the Solr class loader that cause
> resources outside the instanceDir to fail to load. This is a very good goal,
> but it also causes resources in $\{solr.solr.home\}/lib to fail to load. In
> order to get those jars to work, I must turn off all SOLR-4882 safety
> checking.
> I can understand not wanting to load resources from an arbitrary path, but
> the solr home and its children should be about as trustworthy as instanceDir.
> Ideally I'd like to have $\{solr.solr.home\}/lib trusted automatically, since
> it is searched automatically. If I need to define a system property to make
> this happen, I'm OK with that -- as long as I don't have to turn off the
> safety checking entirely.
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