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From: Eric Biggers <ebiggers@kernel.org>
To: Stephan Mueller <smueller@chronox.de>
Cc: herbert@gondor.apana.org.au, mathew.j.martineau@linux.intel.com,
	dhowells@redhat.com, linux-crypto@vger.kernel.org,
	linux-fscrypt@vger.kernel.org, linux-kernel@vger.kernel.org,
	keyrings@vger.kernel.org
Subject: Re: [PATCH 0/5] Add KDF implementations to crypto API
Date: Wed, 6 Jan 2021 22:59:24 -0800	[thread overview]
Message-ID: <X/axTBTMGpJ07tft@sol.localdomain> (raw)
In-Reply-To: <3f8cda66411d4e82074808657df7f1bbbcff37a9.camel@chronox.de>

On Thu, Jan 07, 2021 at 07:37:05AM +0100, Stephan Mueller wrote:
> Am Montag, dem 04.01.2021 um 14:20 -0800 schrieb Eric Biggers:
> > On Mon, Jan 04, 2021 at 10:45:57PM +0100, Stephan Müller wrote:
> > > The HKDF addition is used to replace the implementation in the filesystem
> > > crypto extension. This code was tested by using an EXT4 encrypted file
> > > system that was created and contains files written to by the current
> > > implementation. Using the new implementation a successful read of the
> > > existing files was possible and new files / directories were created
> > > and read successfully. These newly added file system objects could be
> > > successfully read using the current code. Yet if there is a test suite
> > > to validate whether the invokcation of the HKDF calculates the same
> > > result as the existing implementation, I would be happy to validate
> > > the implementation accordingly.
> > 
> > See https://www.kernel.org/doc/html/latest/filesystems/fscrypt.html#tests
> > for how to run the fscrypt tests.  'kvm-xfstests -c ext4 generic/582' should
> > be
> > enough for this, though you could run all the tests if you want.
> 
> I ran the $(kvm-xfstests -c encrypt -g auto) on 5.11-rc2 with and without my
> HKDF changes. I.e. the testing shows the same results for both kernels which
> seems to imply that my HKDF changes do not change the behavior.
> 
> I get the following errors in both occasions - let me know if I should dig a
> bit more.

The command you ran runs almost all xfstests with the test_dummy_encryption
mount option enabled, which is different from running the encryption tests --
and in fact it skips the real encryption tests, so it doesn't test the
correctness of HKDF at all.  It looks like you saw some unrelated test failures.
Sorry if I wasn't clear -- by "all tests" I meant all encryption tests, i.e.
'kvm-xfstests -c ext4 -g encrypt'.  Also, even the single test generic/582
should be sufficient to test HKDF, as I mentioned.

- Eric

  reply	other threads:[~2021-01-07  7:00 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-04 21:45 [PATCH 0/5] Add KDF implementations to crypto API Stephan Müller
2021-01-04 21:47 ` [PATCH 1/5] crypto: Add key derivation self-test support code Stephan Müller
2021-01-04 21:47 ` [PATCH 2/5] crypto: add SP800-108 counter key derivation function Stephan Müller
2021-01-04 21:49 ` [PATCH 3/5] crypto: add RFC5869 HKDF Stephan Müller
2021-01-07  7:30   ` Eric Biggers
2021-01-07  7:53     ` Stephan Mueller
2021-01-07 18:53       ` Eric Biggers
2021-01-04 21:49 ` [PATCH 4/5] security: DH - use KDF implementation from crypto API Stephan Müller
2021-01-12  1:34   ` Jarkko Sakkinen
2021-01-04 21:50 ` [PATCH 5/5] fs: use HKDF implementation from kernel " Stephan Müller
2021-01-07  7:19   ` Eric Biggers
2021-01-07  7:49     ` Stephan Mueller
2021-01-07 18:47       ` Eric Biggers
2021-01-04 22:20 ` [PATCH 0/5] Add KDF implementations to " Eric Biggers
2021-01-07  6:37   ` Stephan Mueller
2021-01-07  6:59     ` Eric Biggers [this message]
2021-01-07  7:12       ` Eric Biggers

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