linux-kernel - Re: randconfig build error with next-20131002, in crypto

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Date:	Thu, 3 Oct 2013 01:56:15 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Jim Davis <jim.epost@...il.com>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	linux-crypto@...r.kernel.org
Subject: Re: randconfig build error with next-20131002, in crypto

On Wed, Oct 02, 2013 at 03:19:51PM -0700, Jim Davis wrote:
> Building with the attached random configuration file,
> 
>   LD      init/built-in.o
> crypto/built-in.o: In function `RSA_verify_signature':
> rsa.c:(.text+0x2dc5e): undefined reference to `mpi_get_nbits'
> rsa.c:(.text+0x2dc68): undefined reference to `mpi_get_nbits'
> rsa.c:(.text+0x2dc89): undefined reference to `mpi_free'
> rsa.c:(.text+0x2dca4): undefined reference to `mpi_cmp_ui'
> rsa.c:(.text+0x2dcb7): undefined reference to `mpi_cmp'
> rsa.c:(.text+0x2dcc6): undefined reference to `mpi_alloc'
> rsa.c:(.text+0x2dce7): undefined reference to `mpi_powm'
> rsa.c:(.text+0x2dcff): undefined reference to `mpi_get_nbits'
> rsa.c:(.text+0x2dd1c): undefined reference to `mpi_get_buffer'
> rsa.c:(.text+0x2de07): undefined reference to `mpi_free'
> make: *** [vmlinux] Error 1

Looks like someone has forgotten this completely unused MPILIB_EXTRA
thing in there.

Does this totally untested but obvious patch help?

---
From: Borislav Petkov <bp@...e.de>
Date: Thu, 3 Oct 2013 01:51:15 +0200
Subject: [PATCH] crypto: Correct RSA MPI dependency

9e235dcaf4f6 ("Revert "crypto: GnuPG based MPI lib - additional sources
(part 4)") removed the MPI lib extra stuff but left RSA selecting it
while it should select CONFIG_MPILIB instead. Fix it.

Reported-by: Jim Davis <jim.epost@...il.com>
Cc: Herbert Xu <herbert@...dor.apana.org.au>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: David Howells <dhowells@...hat.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
---
 crypto/asymmetric_keys/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crypto/asymmetric_keys/Kconfig b/crypto/asymmetric_keys/Kconfig
index 6d2c2ea12559..755f6174585a 100644
--- a/crypto/asymmetric_keys/Kconfig
+++ b/crypto/asymmetric_keys/Kconfig
@@ -21,7 +21,7 @@ config ASYMMETRIC_PUBLIC_KEY_SUBTYPE
 config PUBLIC_KEY_ALGO_RSA
 	tristate "RSA public-key algorithm"
 	depends on ASYMMETRIC_PUBLIC_KEY_SUBTYPE
-	select MPILIB_EXTRA
+	select MPILIB
 	help
 	  This option enables support for the RSA algorithm (PKCS#1, RFC3447).
 
-- 
1.8.4

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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