[PATCH] crypto: ecdsa - Fix module auto-load on add-key

[Stefan Berger]

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@xxxxxxxxxxxxxxx
Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
---
 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@xxxxxxxxxxxxx>");
 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