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

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Date:	Tue, 3 May 2016 21:34:26 -0700
From:	Tadeusz Struk <tstruk@...il.com>
To:	Jamie Heilman <jamie@...ible.transient.net>
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)

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