linux-kernel - Re: Deadlock when using crypto API for block devices

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Message-ID: <20180824112435.ggizlqrymuibm6oo@gondor.apana.org.au>
Date:   Fri, 24 Aug 2018 19:24:35 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Mikulas Patocka <mpatocka@...hat.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        linux-crypto@...r.kernel.org, Mike Snitzer <msnitzer@...hat.com>,
        dm-devel@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: Deadlock when using crypto API for block devices

On Fri, Aug 24, 2018 at 07:06:32AM -0400, Mikulas Patocka wrote:
>
> A quick search through the crypto code shows that ahash_save_req and 
> seqiv_aead_encrypt return -ENOMEM.
> 
> Will you fix them?

These only trigger for unaligned buffers.  It would be much better
if dm-crypt can ensure that the input/output is properly unaligned
and if otherwise do the allocation in dm-crypt.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt