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 02:26:09 +0000
From:	Jamie Heilman <jamie@...ible.transient.net>
To:	David Howells <dhowells@...hat.com>
Cc:	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)

David Howells wrote:
> (cc'ing Tadeusz as he did the pkcs1 padding function)
> 
> Jamie Heilman <jamie@...ible.transient.net> wrote:
> 
> > > > Problem loading in-kernel X.509 certificate (-2)
> > > 
> > > ENOENT?  Hmmm...  The only place that is generated is in the crypto layer.
> > > That suggests missing crypto of some sort.
> > > 
> > > The attached patch enables some debugging in some relevant files if you can
> > > try applying it to your kernel.
> > 
> > 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)

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