linux-kernel - Re: [PATCH 4/9] security: keys: trusted: Store the handle of a loaded key

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Message-ID: <YDB8vwZ2MqQ8x1sj@kernel.org>
Date:   Sat, 20 Feb 2021 05:06:39 +0200
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Matthew Garrett <matthewgarrett@...gle.com>
Cc:     linux-kernel@...r.kernel.org, linux-integrity@...r.kernel.org,
        linux-pm@...r.kernel.org, keyrings@...r.kernel.org,
        zohar@...ux.ibm.com, jejb@...ux.ibm.com, corbet@....net,
        rjw@...ysocki.net, Matthew Garrett <mjg59@...gle.com>
Subject: Re: [PATCH 4/9] security: keys: trusted: Store the handle of a
 loaded key

On Sat, Feb 20, 2021 at 01:32:50AM +0000, Matthew Garrett wrote:
> Certain in-kernel operations using a trusted key (such as creation
> certification) require knowledge of the handle it's loaded at. Keep
> a copy of that in the payload.
> 
> Signed-off-by: Matthew Garrett <mjg59@...gle.com>

This looks good to me as well *as a code change*.

/Jarkko

> ---
>  include/keys/trusted-type.h               | 1 +
>  security/keys/trusted-keys/trusted_tpm2.c | 6 ++++--
>  2 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/include/keys/trusted-type.h b/include/keys/trusted-type.h
> index 020e01a99ea4..154d8a1769c3 100644
> --- a/include/keys/trusted-type.h
> +++ b/include/keys/trusted-type.h
> @@ -21,6 +21,7 @@
>  
>  struct trusted_key_payload {
>  	struct rcu_head rcu;
> +	unsigned int blob_handle;
>  	unsigned int key_len;
>  	unsigned int blob_len;
>  	unsigned int creation_len;
> diff --git a/security/keys/trusted-keys/trusted_tpm2.c b/security/keys/trusted-keys/trusted_tpm2.c
> index 6357a51a24e9..a3673fffd834 100644
> --- a/security/keys/trusted-keys/trusted_tpm2.c
> +++ b/security/keys/trusted-keys/trusted_tpm2.c
> @@ -272,11 +272,13 @@ static int tpm2_load_cmd(struct tpm_chip *chip,
>  	}
>  
>  	rc = tpm_send(chip, buf.data, tpm_buf_length(&buf));
> -	if (!rc)
> +	if (!rc) {
>  		*blob_handle = be32_to_cpup(
>  			(__be32 *) &buf.data[TPM_HEADER_SIZE]);
> -	else
> +		payload->blob_handle = *blob_handle;
> +	} else {
>  		goto out;
> +	}
>  
>  	rc = tpm2_unpack_blob(payload);
>  out:
> -- 
> 2.30.0.617.g56c4b15f3c-goog
> 
>