Re: [PATCH 5.10 182/575] fscrypt: allow 256-bit master keys with AES-256-XTS

Hi!

From: Eric Biggers ebiggers@google.com

[ Upstream commit 7f595d6a6cdc336834552069a2e0a4f6d4756ddf ]

fscrypt currently requires a 512-bit master key when AES-256-XTS is used, since AES-256-XTS keys are 512-bit and fscrypt requires that the master key be at least as long any key that will be derived from it.

Quoting Eric Biggers ebiggers@kernel.org

I don't expect any problem with backporting this, but I don't see how this follows the stable kernel rules (Documentation/process/stable-kernel-rules.rst). I don't see what distinguishes this patch from ones that don't get picked up by AUTOSEL; it seems pretty arbitrary to me.

- Eric

And I agree, this should not be in stable.

Best regards, Pavel