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Android 9.0 states that there is some support for metadata encryption (https://source.android.com/security/encryption/metadata). This seems to require presence of some "dm-default-key" module. It appears that I did not find any reference of this module on my kernel (4.9), nor on those I browsed on the internet. Does anyone know where to find more information on how to implement it in the kernel? I have no specification on what it is expected to do, nor any reference implementation.

Cedric Auger
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2 Answers2

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Here you go

https://github.com/kdrag0n/proton_bluecross/blob/master/drivers/md/dm-default-key.c

Hit the history button to see history of this file

aryanisno1
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Here it is on the most recent kernel for Pixel 3 XL devices:

https://android.googlesource.com/kernel/msm/+/refs/heads/android-msm-crosshatch-4.9-q-preview-6/drivers/md/dm-default-key.c

Paul Crowley
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