Re: [PATCH v5 0/6] fscrypt preparations for encryption+casefolding

[Eric Biggers <ebiggers@xxxxxxxxxx>]

On Mon, Jan 20, 2020 at 02:31:55PM -0800, Eric Biggers wrote:
> This is a cleaned up and fixed version of the fscrypt patches to prepare
> for directories that are both encrypted and casefolded.
> 
> Patches 1-3 start deriving a SipHash key for the new dirhash method that
> will be used by encrypted+casefolded directories.  To avoid unnecessary
> overhead, we only do this if the directory is actually casefolded.
> 
> Patch 4 fixes a bug in UBIFS where it didn't gracefully handle invalid
> hash values in fscrypt no-key names.  This is an existing bug, but the
> new fscrypt no-key name format (patch 6) made it much easier to trigger;
> it started being hit by 'kvm-xfstests -c ubifs -g encrypt'.
> 
> Patch 5 updates UBIFS to make it ready for the new fscrypt no-key name
> format that always includes the dirhash.
> 
> Patch 6 modifies the fscrypt no-key names to always include the dirhash,
> since with the new dirhash method the dirhash will no longer be
> computable from the ciphertext filename without the key.  It also fixes
> a longstanding issue where there could be collisions in the no-key
> names, due to not using a proper cryptographic hash to abbreviate names.
> 
> For more information see the main patch series, which includes the
> filesystem-specific changes:
> https://lkml.kernel.org/linux-fscrypt/20200117214246.235591-1-drosen@xxxxxxxxxx/T/#u
> 
> This applies to fscrypt.git#master.
> 
> Changed v4 => v5:
>   - Fixed UBIFS encryption to work with the new no-key name format.

I've applied this series to fscrypt.git#master; however I'd still like Acked-bys
from the UBIFS maintainers on the two UBIFS patches, as well as more
Reviewed-bys from anyone interested.  If I don't hear anything from anyone, I
might drop these to give more time, especially if there isn't an v5.5-rc8.

- Eric

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