Ext2 immutable Fix

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I mailed Remy Card about this already, but haven't heard back from him, so I thought I'd post this to the list to make sure it got out there. A couple of weeks ago I was playing with the ext2 immutable and append flags and noticed that it is possible to overwrite an immutable or append only file simply by renameing a non-immutable file over the old immutable file! Definately defeats the purpose of immutable files.

The problem is that the new_inode isn't checked to make sure it's not immutable before the rename is done. The following patch corrects the problem (patched against 2.0.30):