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Date: Thu, 02 Oct 2014 00:05:45 +0200
From: Hannes Frederic Sowa <>
Subject: xfs directory hash ordering bug


Another kernel bug which did not get a CVE yet, but should be considered
to get one (sorry for the late notification):

Basically it allows a local user to corrupt a xfs filesystem by just
creating directories. Depending on whether it is the root filesystem or
not the kernel panics or just oopses and forcefully disconnects the

The commit states that xfs_repair repairs the filesystem but IIRC
further access to that directory would still cause the kernel to either
oops or panic. So xfs_repair could not correctly fix the filesystem in
all situations. But I am not sure anymore and didn't follow up on this
(I had a relocation coming up).

My initial report here:



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