On Tue, 2009-10-06 at 16:25 -0700, Marc Tamsky wrote: > Package: linux-image-2.6.26-1-amd64 > Version: 2.6.26-13 You should install security updates. > Justification: causes serious data loss > Severity: critical > > *** Please type your report below this line *** > > Attaching a 4TB hfsplus formatted volume to this host caused it to silently > identify it as a 2TB device (with a [mac] labelled partition table, > that contained a 3.6TB partition specification (sdd3)) > > Attempts to fill the 4TB device with more than 2TB of data caused serious > data loss, possibly corrupting the hfsplus filesystem. > > Lack of a default kernel setting of 'CONFIG_LBD=y' is the proposed root > cause. All official Debian kernel packages are configured with CONFIG_LBD=y. This actually appears to be a bug in Linux's HFS+ implementation, which calculates sector numbers using 32-bit numbers. I don't think we can reasonably fix this in a stable update, but we should be able to prevent mounting HFS+ partitions larger than 2TB, and so avoid data loss. Ben. -- Ben Hutchings To err is human; to really foul things up requires a computer.
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