linux-kernel - Re: [PATCH v1 3/4] keys, trusted: select the hash algorithm

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Date:	Thu, 29 Oct 2015 15:37:20 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:	Peter Huewe <peterhuewe@....de>,
	Marcel Selhorst <tpmdd@...horst.net>,
	David Howells <dhowells@...hat.com>,
	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
	chris.j.arges@...onical.com, seth.forshee@...onical.com,
	colin.king@...onical.com, josh@...htriplett.org,
	David Safford <safford@...ibm.com>,
	James Morris <james.l.morris@...cle.com>,
	"Serge E. Hallyn" <serge@...lyn.com>
Subject: Re: [PATCH v1 3/4] keys, trusted: select the hash algorithm

On Thu, 2015-10-29 at 17:59 +0200, Jarkko Sakkinen wrote:
> Added 'hash=' option for selecting the hash algorithm for add_key()
> syscall.
> 
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> ---
>  security/keys/trusted.c | 20 +++++++++++++++++++-
>  1 file changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/security/keys/trusted.c b/security/keys/trusted.c
> index d3633cf..7a87bcd 100644
> --- a/security/keys/trusted.c
> +++ b/security/keys/trusted.c
> @@ -11,6 +11,7 @@
>   * See Documentation/security/keys-trusted-encrypted.txt
>   */
> 
> +#include <crypto/hash_info.h>

This introduces a Kconfig dependency on CRYPTO_HASH_INFO. 

Mimi

>  #include <linux/uaccess.h>
>  #include <linux/module.h>
>  #include <linux/init.h>
> @@ -710,7 +711,8 @@ enum {
>  	Opt_err = -1,
>  	Opt_new, Opt_load, Opt_update,
>  	Opt_keyhandle, Opt_keyauth, Opt_blobauth,
> -	Opt_pcrinfo, Opt_pcrlock, Opt_migratable
> +	Opt_pcrinfo, Opt_pcrlock, Opt_migratable,
> +	Opt_hash,
>  };
> 
>  static const match_table_t key_tokens = {
> @@ -723,6 +725,7 @@ static const match_table_t key_tokens = {
>  	{Opt_pcrinfo, "pcrinfo=%s"},
>  	{Opt_pcrlock, "pcrlock=%s"},
>  	{Opt_migratable, "migratable=%s"},
> +	{Opt_hash, "hash=%s"},
>  	{Opt_err, NULL}
>  };
> 
> @@ -736,6 +739,7 @@ static int getoptions(char *c, struct trusted_key_payload *pay,
>  	int res;
>  	unsigned long handle;
>  	unsigned long lock;
> +	int i;
> 
>  	while ((p = strsep(&c, " \t"))) {
>  		if (*p == '\0' || *p == ' ' || *p == '\t')
> @@ -787,6 +791,20 @@ static int getoptions(char *c, struct trusted_key_payload *pay,
>  				return -EINVAL;
>  			opt->pcrlock = lock;
>  			break;
> +		case Opt_hash:
> +			for (i = 0; i < HASH_ALGO__LAST; i++) {
> +				if (!strcmp(args[0].from, hash_algo_name[i])) {
> +					opt->hash = i;
> +					break;
> +				}
> +			}
> +			res = tpm_is_tpm2(TPM_ANY_NUM);
> +			if (res < 0)
> +				return res;
> +			if (i == HASH_ALGO__LAST ||
> +			    (!res && i != HASH_ALGO_SHA1))
> +				return -EINVAL;
> +			break;
>  		default:
>  			return -EINVAL;
>  		}


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