Re: [PATCH 18/18] keyctl_pkey: Add pkey parameter slen to pass in PSS salt length

[Jarkko Sakkinen]

On Tue, Mar 30, 2021 at 10:28:29PM +0200, Varad Gautam wrote:
> keyctl pkey_* operations accept enc and hash parameters at present.
> RSASSA-PSS signatures also require passing in the signature salt
> length.
> 
> Add another parameter 'slen' to feed in salt length of a PSS
> signature.
> 
> Signed-off-by: Varad Gautam <varad.gau...@suse.com>
> ---


Reviewed-by: Jarkko Sakkinen <jar...@kernel.org>

/Jarkko

>  crypto/asymmetric_keys/asymmetric_type.c | 1 +
>  include/linux/keyctl.h                   | 1 +
>  security/keys/keyctl_pkey.c              | 6 ++++++
>  3 files changed, 8 insertions(+)
> 
> diff --git a/crypto/asymmetric_keys/asymmetric_type.c 
> b/crypto/asymmetric_keys/asymmetric_type.c
> index ad8af3d70ac0..eb2ef4a07f8e 100644
> --- a/crypto/asymmetric_keys/asymmetric_type.c
> +++ b/crypto/asymmetric_keys/asymmetric_type.c
> @@ -571,6 +571,7 @@ static int asymmetric_key_verify_signature(struct 
> kernel_pkey_params *params,
>               .hash_algo      = params->hash_algo,
>               .digest         = (void *)in,
>               .s              = (void *)in2,
> +             .salt_length    = params->slen,
>       };
>  
>       return verify_signature(params->key, &sig);
> diff --git a/include/linux/keyctl.h b/include/linux/keyctl.h
> index 5b79847207ef..970c7bed3082 100644
> --- a/include/linux/keyctl.h
> +++ b/include/linux/keyctl.h
> @@ -37,6 +37,7 @@ struct kernel_pkey_params {
>               __u32   in2_len;        /* 2nd input data size (verify) */
>       };
>       enum kernel_pkey_operation op : 8;
> +     __u32           slen;
>  };
>  
>  #endif /* __LINUX_KEYCTL_H */
> diff --git a/security/keys/keyctl_pkey.c b/security/keys/keyctl_pkey.c
> index 5de0d599a274..b54a021e16b1 100644
> --- a/security/keys/keyctl_pkey.c
> +++ b/security/keys/keyctl_pkey.c
> @@ -24,11 +24,13 @@ enum {
>       Opt_err,
>       Opt_enc,                /* "enc=<encoding>" eg. "enc=oaep" */
>       Opt_hash,               /* "hash=<digest-name>" eg. "hash=sha1" */
> +     Opt_slen,               /* "slen=<salt-length>" eg. "slen=32" */
>  };
>  
>  static const match_table_t param_keys = {
>       { Opt_enc,      "enc=%s" },
>       { Opt_hash,     "hash=%s" },
> +     { Opt_slen,     "slen=%u" },
>       { Opt_err,      NULL }
>  };
>  
> @@ -63,6 +65,10 @@ static int keyctl_pkey_params_parse(struct 
> kernel_pkey_params *params)
>                       params->hash_algo = q;
>                       break;
>  
> +             case Opt_slen:
> +                     if (kstrtouint(q, 0, &params->slen))
> +                             return -EINVAL;
> +                     break;
>               default:
>                       return -EINVAL;
>               }
> -- 
> 2.30.2
> 
>