linux-kernel - Re: v4.6-rc1 regression bisected, Problem loading in-kernel X.509 certificate (-2)

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Date:	Wed, 4 May 2016 04:53:56 +0000
From:	Jamie Heilman <jamie@...ible.transient.net>
To:	Tadeusz Struk <tstruk@...il.com>
Cc:	David Howells <dhowells@...hat.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
	tadeusz.struk@...el.com
Subject: Re: v4.6-rc1 regression bisected, Problem loading in-kernel X.509
 certificate (-2)

Tadeusz Struk wrote:
> On 05/03/2016 07:26 PM, Jamie Heilman wrote:
> >>> Alrighty, presumably relevant bits:
> >>> > >
> >>> > > X.509: Cert Issuer: Build time autogenerated kernel key
> >>> > > X.509: Cert Subject: Build time autogenerated kernel key
> >>> > > X.509: Cert Key Algo: rsa
> >>> > > X.509: Cert Valid period: 1461826791-4615426791
> >>> > > X.509: Cert Signature: rsa + sha512
> >>> > > X.509: ==>x509_check_signature()
> >>> > > X.509: ==>x509_get_sig_params()
> >>> > > X.509: <==x509_get_sig_params() = 0
> >>> > > PKEY: ==>public_key_verify_signature()
> >>> > > X.509: Cert Verification: -2
> >> > 
> >> > Hmmm...  Okay, the only ways out of public_key_verify_signature() without
> >> > printing a leaving message are for snprintf() to overrun (which would return
> >> > error -22) or for crypto_alloc_akcipher() to have failed; everything else must
> >> > go through the kleave() at the pr_devel() at the bottom of the function.
> >> > 
> >> > Can you stick:
> >> > 
> >> > 	pr_devel("ALGO: %s\n", alg_name);
> >> > 
> >> > immediately before this line:
> >> > 
> >> > 	tfm = crypto_alloc_akcipher(alg_name, 0, 0);
> >> > 
> >> > and try it again?
> > PKEY: ALGO: pkcs1pad(rsa,sha512)
> 
> I think the problem is that pkcs1pad template needs CRYPTO_MANAGER, but
> your configuration doesn't enable CRYPTO_MANAGER. Could you try this
> please:
> 
> diff --git a/crypto/Kconfig b/crypto/Kconfig
> index 93a1fdc..1d33beb 100644
> --- a/crypto/Kconfig
> +++ b/crypto/Kconfig
> @@ -96,6 +96,7 @@ config CRYPTO_AKCIPHER
>  config CRYPTO_RSA
>  	tristate "RSA algorithm"
>  	select CRYPTO_AKCIPHER
> +	select CRYPTO_MANAGER
>  	select MPILIB
>  	select ASN1
>  	help

Yep, that does indeed make everything work again.

-- 
Jamie Heilman                     http://audible.transient.net/~jamie/