loop-aes module not usable cause standard lucid kernel has CONFIG_BLK_DEV_LOOP=y

Asked by Thorsten Peter on 2010-07-14

I am running Lucid AMD64 Server and am trying to get loop-aes to work.
I installed loop-aes-source and compiled it via module-assistant. Worked fine but I cannot load the module.
I get the following errors:

$ modprobe loop
FATAL: Error inserting loop (/lib/modules/2.6.32-23-generic/updates/loop.ko): Invalid module format

loop: exports duplicate symbol loop_unregister_transfer (owned by kernel)

From what I read and know about loop-aes this is caused if you have the loop driver compiled into the kernel which is the case with Lucid.
Does that mean that the only way to use loop-aes is compiling a custom kernel?
This would raise the question if it makes sense to include loop-aes packages with lucid at all?
If I gotta recompile the kernel to use loop-aes, I can for sure compile loop-aes from source manually as well ....



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Ubuntu loop-aes Edit question
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This is apparently a decision of the kernel team. You can follow the linked bug report to see if they manage to find a workaround, but if you want loop-aes right now, you'll have to compile your own custom kernel. (You can apparently also use dm-crypt for now, if that's helpful.)

Jirka (hladky-jiri) said : #2

Hi Thorsten,

I'm running Lucid with 2.6.32-24-generic kernel.

I have run into the same issue. I can create loop.ko but it does not work:

# modprobe loop
FATAL: Error inserting loop (/lib/modules/2.6.32-24-generic/updates/loop.ko): Invalid module format

Is there some other solution other than recompile the kernel?

So far I have used aespipe to remove the encryption:
aespipe -d -e aes256 -K keyfile.gpg <data.img >data.plain

I have used aes-loop for 8 years and I was very happy with it. Now it seems I need to use another solution. What are the alternatives?


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