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From: Stefan Berger <stefanb@linux.ibm.com>
To: linux-crypto@vger.kernel.org, herbert@gondor.apana.org.au,
        davem@davemloft.net
Cc: linux-kernel@vger.kernel.org, saulo.alessandre@tse.jus.br, vt@altlinux.org,
        Stefan Berger <stefanb@linux.ibm.com>, stable@vger.kernel.org
Subject: [PATCH] crypto: ecdsa - Fix module auto-load on add-key
Date: Thu, 21 Mar 2024 10:44:33 -0400
Message-ID: <20240321144433.1671394-1-stefanb@linux.ibm.com>
Precedence: bulk
MIME-Version: 1.0
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Add module alias with the algorithm cra_name similar to what we have for
RSA-related and other algorithms.

The kernel attempts to modprobe asymmetric algorithms using the names
"crypto-$cra_name" and "crypto-$cra_name-all." However, since these
aliases are currently missing, the modules are not loaded. For instance,
when using the `add_key` function, the hash algorithm is typically
loaded automatically, but the asymmetric algorithm is not.

Steps to test:

1. Create certificate

  openssl req -x509 -sha256 -newkey ec \
  -pkeyopt "ec_paramgen_curve:secp384r1" -keyout key.pem -days 365 \
  -subj '/CN=test' -nodes -outform der -out nist-p384.der

2. Optionally, trace module requests with: trace-cmd stream -e module &

3. Trigger add_key call for the cert:

   # keyctl padd asymmetric "" @u < nist-p384.der
   641069229
   # lsmod | head -2
   Module                  Size  Used by
   ecdsa_generic          16384  0

Fixes: c12d448ba939 ("crypto: ecdsa - Register NIST P384 and extend test suite")
Cc: stable@vger.kernel.org
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 crypto/ecdsa.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/crypto/ecdsa.c b/crypto/ecdsa.c
index fbd76498aba8..3f9ec273a121 100644
--- a/crypto/ecdsa.c
+++ b/crypto/ecdsa.c
@@ -373,4 +373,7 @@ module_exit(ecdsa_exit);
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Stefan Berger <stefanb@linux.ibm.com>");
 MODULE_DESCRIPTION("ECDSA generic algorithm");
+MODULE_ALIAS_CRYPTO("ecdsa-nist-p192");
+MODULE_ALIAS_CRYPTO("ecdsa-nist-p256");
+MODULE_ALIAS_CRYPTO("ecdsa-nist-p384");
 MODULE_ALIAS_CRYPTO("ecdsa-generic");
-- 
2.43.0