linux-kernel - Re: [dm-devel] [PATCH 1/3 v2] crypto: introduce the flag CRYPTO_ALG_ALLOCATES

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Date:   Mon, 29 Jun 2020 09:17:08 -0400 (EDT)
From:   Mikulas Patocka <mpatocka@...hat.com>
To:     Eric Biggers <ebiggers@...nel.org>
cc:     Mike Snitzer <msnitzer@...hat.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Zaibo Xu <xuzaibo@...wei.com>, linux-kernel@...r.kernel.org,
        Wei Xu <xuwei5@...ilicon.com>, dm-devel@...hat.com,
        George Cherian <gcherian@...vell.com>,
        linux-crypto@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        "David S. Miller" <davem@...emloft.net>,
        Milan Broz <mbroz@...hat.com>
Subject: Re: [dm-devel] [PATCH 1/3 v2] crypto: introduce the flag
 CRYPTO_ALG_ALLOCATES_MEMORY



On Sun, 28 Jun 2020, Eric Biggers wrote:

> On Sun, Jun 28, 2020 at 03:07:49PM -0400, Mikulas Patocka wrote:
> > > 
> > > cryptd_create_skcipher(), cryptd_create_hash(), cryptd_create_aead(), and
> > > crypto_rfc4309_create() are also missing setting the mask.
> > > 
> > > pcrypt_create_aead() is missing both setting the mask and inheriting the flags.
> > 
> > I added CRYPTO_ALG_ALLOCATES_MEMORY there.
> 
> I don't see where the cryptd request processing functions allocate memory.
> 
> It seems that cryptd should just inherit the flag, like most other templates.
> 
> Likewise for pcrypt.
> 
> And also likewise for rfc4309.
> 
> Where are you seeing the memory allocations that would require
> CRYPTO_ALG_ALLOCATES_MEMORY to always be enabled for these?
> 
> - Eric

This was some misunderstanding. You said "cryptd_create_skcipher ... is 
missing both setting the mask and inheriting the flags.", so I understood 
it so that it should inherit CRYPTO_ALG_INHERITED_FLAGS and set 
CRYPTO_ALG_ALLOCATES_MEMORY unconditionally.

Mikulas