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

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Date: Thu, 21 Mar 2024 10:38:18 -0400
From: Stefan Berger <stefanb@...ux.ibm.com>
To: Vitaly Chikunov <vt@...linux.org>,
        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: Re: [PATCH] crypto: ecrdsa - Fix module auto-load on add_key



On 3/17/24 20:42, Vitaly Chikunov wrote:
> 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>

Tested-by: Stefan Berger <stefanb@...ux.ibm.com>

> ---
>   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");