2021-03-20 11:22:04

by Andreas Dilger

[permalink] [raw]
Subject: Re: [PATCH v2 1/2] ext4: Handle casefolding with encryption

On Mar 19, 2021, at 1:34 AM, Daniel Rosenberg <[email protected]> wrote:
> This adds support for encryption with casefolding.
> Since the name on disk is case preserving, and also encrypted, we can no
> longer just recompute the hash on the fly. Additionally, to avoid
> leaking extra information from the hash of the unencrypted name, we use
> siphash via an fscrypt v2 policy.
> The hash is stored at the end of the directory entry for all entries
> inside of an encrypted and casefolded directory apart from those that
> deal with '.' and '..'. This way, the change is backwards compatible
> with existing ext4 filesystems.
> Signed-off-by: Daniel Rosenberg <[email protected]>

Reviewed-by: Andreas Dilger <[email protected]>

Cheers, Andreas

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