linux-kernel - Re: [PATCH] arm64/crypto: Select AEAD2 for GHASH_ARM64

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Date:   Thu, 23 Jun 2022 15:08:32 -0400
From:   Qian Cai <quic_qiancai@...cinc.com>
To:     Eric Biggers <ebiggers@...nel.org>
CC:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Ard Biesheuvel <ardb@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, <linux-crypto@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64/crypto: Select AEAD2 for GHASH_ARM64_CE

On Thu, Jun 23, 2022 at 10:17:19AM -0700, Eric Biggers wrote:
> On Wed, Jun 22, 2022 at 10:25:57AM -0400, Qian Cai wrote:
> > Otherwise, we could fail to compile.
> > 
> > ld: arch/arm64/crypto/ghash-ce-glue.o: in function 'ghash_ce_mod_exit':
> > ghash-ce-glue.c:(.exit.text+0x24): undefined reference to 'crypto_unregister_aead'
> > ld: arch/arm64/crypto/ghash-ce-glue.o: in function 'ghash_ce_mod_init':
> > ghash-ce-glue.c:(.init.text+0x34): undefined reference to 'crypto_register_aead'
> > 
> > Fixes: 37b6aab68fae ("crypto: arm64/ghash - drop PMULL based shash")
> 
> I don't see how the Fixes commit is related.  Hasn't this been a problem since
> commit 537c1445ab0b, which added an AEAD algorithm to this module?

Ah, you are probably right. crypto_unregister_aead and crypto_register_aead
are already there in the previous commit.

> 
> > diff --git a/arch/arm64/crypto/Kconfig b/arch/arm64/crypto/Kconfig
> > index 4391a463abd7..6b2ecc193bc0 100644
> > --- a/arch/arm64/crypto/Kconfig
> > +++ b/arch/arm64/crypto/Kconfig
> > @@ -71,6 +71,7 @@ config CRYPTO_GHASH_ARM64_CE
> >  	select CRYPTO_HASH
> >  	select CRYPTO_GF128MUL
> >  	select CRYPTO_LIB_AES
> > +	select CRYPTO_AEAD2
> 
> I don't think CRYPTO_AEAD2 is meant to be selected directly.  It should be
> CRYPTO_AEAD instead.

I am not sure about that. I chose CRYPTO_AEAD2 because that is in the
Makefile.

obj-$(CONFIG_CRYPTO_AEAD2) += aead.o