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https://issues.apache.org/jira/browse/DERBY-5363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13095696#comment-13095696
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Dag H. Wanvik commented on DERBY-5363:
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Thanks for looking at the patch code, Knut. 1) Agreed, it's brittle. 2) Yes, I
did consider that. It is probably more robust, so I like the idea, although
it's slightly more code to perform for the Posix case. The upside is probably
more important: I read somewhere a NFS share on Windows would have Posix
permissions, and your solution might make it work correctly in such a case
also. 3) I think it would mostly be single threaded, at least on a new
database, but I don't think we have a guarantee, so I'll protect it.
> Tighten default permissions of DB files with >= JDK6
> ----------------------------------------------------
>
> Key: DERBY-5363
> URL: https://issues.apache.org/jira/browse/DERBY-5363
> Project: Derby
> Issue Type: Improvement
> Components: Miscellaneous, Services, Store
> Reporter: Dag H. Wanvik
> Assignee: Dag H. Wanvik
> Attachments: derby-5363-basic-1.diff, derby-5363-basic-1.stat,
> derby-5363-basic-2.diff, derby-5363-basic-2.stat, permission-5.diff,
> permission-5.stat, permission-6.diff, permission-6.stat, property-table.png,
> z.sql
>
>
> Before Java 6, files created by Derby would have the default
> permissions of the operating system context. Under Unix, this would
> depend on the effective umask of the process that started the Java VM.
> In Java 6 and 7, there are methods available that allows tightening up this
> (File.setReadable, setWritable), making it less likely that somebody
> would accidentally run Derby with a too lenient default.
> I suggest we take advantage of this, and let Derby by default (in Java
> 6 and higher) limit the visibility to the OS user that starts the VM,
> e.g. on Unix this would be equivalent to running with umask 0077. More
> secure by default is good, I think.
> We could have a flag, e.g. "derby.storage.useDefaultFilePermissions"
> that when set to true, would give the old behavior.
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