linux-kernel - Re: [PATCH 2/2] crypto: drbg: DRBG

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Message-ID: <20200228102346.GA1662@Red>
Date:   Fri, 28 Feb 2020 11:23:46 +0100
From:   LABBE Corentin <clabbe@...libre.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     davem@...emloft.net, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] crypto: drbg: DRBG_CTR should select CTR

On Fri, Feb 28, 2020 at 11:30:52AM +1100, Herbert Xu wrote:
> On Wed, Feb 19, 2020 at 03:51:35PM +0000, Corentin Labbe wrote:
> > if CRYPTO_DRBG_CTR is builtin and CTR is module, allocating such algo
> > will fail.
> > DRBG: could not allocate CTR cipher TFM handle: ctr(aes)
> > alg: drbg: Failed to reset rng
> > alg: drbg: Test 0 failed for drbg_pr_ctr_aes128
> > DRBG: could not allocate CTR cipher TFM handle: ctr(aes)
> > alg: drbg: Failed to reset rng
> > alg: drbg: Test 0 failed for drbg_nopr_ctr_aes128
> > DRBG: could not allocate CTR cipher TFM handle: ctr(aes)
> > alg: drbg: Failed to reset rng
> > alg: drbg: Test 0 failed for drbg_nopr_ctr_aes192
> > DRBG: could not allocate CTR cipher TFM handle: ctr(aes)
> > alg: drbg: Failed to reset rng
> > ialg: drbg: Test 0 failed for drbg_nopr_ctr_aes256
> > 
> > Since setting DRBG_CTR=CTR lead to a recursive dependency, let's depends
> > on CTR=y
> > 
> > Signed-off-by: Corentin Labbe <clabbe@...libre.com>
> > ---
> >  crypto/Kconfig | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/crypto/Kconfig b/crypto/Kconfig
> > index 6d27fc6a7bf5..eddeb43fc01c 100644
> > --- a/crypto/Kconfig
> > +++ b/crypto/Kconfig
> > @@ -1822,7 +1822,7 @@ config CRYPTO_DRBG_HASH
> >  config CRYPTO_DRBG_CTR
> >  	bool "Enable CTR DRBG"
> >  	select CRYPTO_AES
> > -	depends on CRYPTO_CTR
> > +	depends on CRYPTO_CTR=y
> 
> This should be turned into a select.
> 

it fail also if I select it:
crypto/Kconfig:1800:error: recursive dependency detected!
crypto/Kconfig:1800:	symbol CRYPTO_DRBG_MENU is selected by CRYPTO_RNG_DEFAULT
crypto/Kconfig:83:	symbol CRYPTO_RNG_DEFAULT is selected by CRYPTO_SEQIV
crypto/Kconfig:330:	symbol CRYPTO_SEQIV is selected by CRYPTO_CTR
crypto/Kconfig:370:	symbol CRYPTO_CTR is selected by CRYPTO_DRBG_CTR
crypto/Kconfig:1822:	symbol CRYPTO_DRBG_CTR depends on CRYPTO_DRBG_MENU

I forgot to say it in the commit message.
I will send a v2 with an updated commit message.

Regards