linux-kernel - [PATCH] crypto: ecrdsa - Fix module auto-load on add

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Date: Mon, 18 Mar 2024 03:42:40 +0300
From: Vitaly Chikunov <vt@...linux.org>
To: Herbert Xu <herbert@...dor.apana.org.au>,
	linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Paul Wolneykien <manowar@...linux.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH] crypto: ecrdsa - Fix module auto-load on add_key

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. Cert is generated usings ima-evm-utils test suite with
   `gen-keys.sh`, example cert is provided below:

  $ base64 -d >test-gost2012_512-A.cer <<EOF
  MIIB/DCCAWagAwIBAgIUK8+whWevr3FFkSdU9GLDAM7ure8wDAYIKoUDBwEBAwMFADARMQ8wDQYD
  VQQDDAZDQSBLZXkwIBcNMjIwMjAxMjIwOTQxWhgPMjA4MjEyMDUyMjA5NDFaMBExDzANBgNVBAMM
  BkNBIEtleTCBoDAXBggqhQMHAQEBAjALBgkqhQMHAQIBAgEDgYQABIGALXNrTJGgeErBUOov3Cfo
  IrHF9fcj8UjzwGeKCkbCcINzVUbdPmCopeJRHDJEvQBX1CQUPtlwDv6ANjTTRoq5nCk9L5PPFP1H
  z73JIXHT0eRBDVoWy0cWDRz1mmQlCnN2HThMtEloaQI81nTlKZOcEYDtDpi5WODmjEeRNQJMdqCj
  UDBOMAwGA1UdEwQFMAMBAf8wHQYDVR0OBBYEFCwfOITMbE9VisW1i2TYeu1tAo5QMB8GA1UdIwQY
  MBaAFCwfOITMbE9VisW1i2TYeu1tAo5QMAwGCCqFAwcBAQMDBQADgYEAmBfJCMTdC0/NSjz4BBiQ
  qDIEjomO7FEHYlkX5NGulcF8FaJW2jeyyXXtbpnub1IQ8af1KFIpwoS2e93LaaofxpWlpQLlju6m
  KYLOcO4xK3Whwa2hBAz9YbpUSFjvxnkS2/jpH2MsOSXuUEeCruG/RkHHB3ACef9umG6HCNQuAPY=
  EOF

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

3. Trigger add_key call for the cert:

  # keyctl padd asymmetric "" @u <test-gost2012_512-A.cer
  939910969
  # lsmod | head -3
  Module                  Size  Used by
  ecrdsa_generic         16384  0
  streebog_generic       28672  0

Repored-by: Paul Wolneykien <manowar@...linux.org>
Cc: stable@...r.kernel.org
Signed-off-by: Vitaly Chikunov <vt@...linux.org>
---
 crypto/ecrdsa.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/crypto/ecrdsa.c b/crypto/ecrdsa.c
index f3c6b5e15e75..3811f3805b5d 100644
--- a/crypto/ecrdsa.c
+++ b/crypto/ecrdsa.c
@@ -294,4 +294,5 @@ module_exit(ecrdsa_mod_fini);
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Vitaly Chikunov <vt@...linux.org>");
 MODULE_DESCRIPTION("EC-RDSA generic algorithm");
+MODULE_ALIAS_CRYPTO("ecrdsa");
 MODULE_ALIAS_CRYPTO("ecrdsa-generic");
-- 
2.42.1