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From: Mimi Zohar <zohar@linux.ibm.com>
To: Roberto Sassu <roberto.sassu@huawei.com>,
	jarkko.sakkinen@linux.intel.com
Cc: linux-integrity@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	linux-kernel@vger.kernel.org, silviu.vlasceanu@huawei.com
Subject: Re: [PATCH v3 1/5] tpm: change the end marker of the active_banks array to zero
Date: Thu, 01 Nov 2018 10:42:57 -0400	[thread overview]
Message-ID: <1541083377.4035.13.camel@linux.ibm.com> (raw)
In-Reply-To: <1540996980.11273.67.camel@linux.ibm.com>

On Wed, 2018-10-31 at 10:43 -0400, Mimi Zohar wrote:
> On Tue, 2018-10-30 at 16:47 +0100, Roberto Sassu wrote:
> > This patch changes the end marker of the active_banks array from
> > TPM2_ALG_ERROR to zero.
> 
> The patch description is a bit off.
> 
> TPM2_ALG_ERROR is defined as zero.  Since tpm_chip_alloc() calls
> kzalloc to allocate the structure, there is no need to explicitly set
> the active_banks end marker to TPM2_ALG_ERROR, nor is there a need to
> explicitly test for the end marker.
> 
> This patch removes explicitly setting the end marker and changes the
> coding style.
> 
> > 
> > Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
> > ---
> >  drivers/char/tpm/tpm-interface.c | 2 +-
> >  drivers/char/tpm/tpm2-cmd.c      | 3 ---
> >  2 files changed, 1 insertion(+), 4 deletions(-)
> > 
> > diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> > index 1a803b0cf980..f7fc4b5ee239 100644
> > --- a/drivers/char/tpm/tpm-interface.c
> > +++ b/drivers/char/tpm/tpm-interface.c
> > @@ -1051,7 +1051,7 @@ int tpm_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash)
> >  		memset(digest_list, 0, sizeof(digest_list));
> >  
> >  		for (i = 0; i < ARRAY_SIZE(chip->active_banks) &&
> > -			    chip->active_banks[i] != TPM2_ALG_ERROR; i++) {
> > +			    chip->active_banks[i]; i++) {
> >  			digest_list[i].alg_id = chip->active_banks[i];
> >  			memcpy(digest_list[i].digest, hash, TPM_DIGEST_SIZE);
> >  			count++;

The fourth patch further updates this code.  Please move those changes
to this first patch.  No need to touch the same code in both places.

                for (i = 0; i < ARRAY_SIZE(chip->active_banks) &&
-                           chip->active_banks[i]; i++) {
-                       digest_list[i].alg_id = chip->active_banks[i];
+                           chip->active_banks[i].alg_id; i++) {
+                       digest_list[i].alg_id = chip->active_banks[i].alg_id;
                        memcpy(digest_list[i].digest, hash, TPM_DIGEST_SIZE);
                        count++;
                }
Mimi

> > diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
> > index c31b490bd41d..046c9d8f3c1e 100644
> > --- a/drivers/char/tpm/tpm2-cmd.c
> > +++ b/drivers/char/tpm/tpm2-cmd.c
> > @@ -908,9 +908,6 @@ static ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip)
> >  	}
> >  
> >  out:
> > -	if (i < ARRAY_SIZE(chip->active_banks))
> > -		chip->active_banks[i] = TPM2_ALG_ERROR;
> > -
> >  	tpm_buf_destroy(&buf);
> >  
> >  	return rc;
> 


  reply	other threads:[~2018-11-01 14:43 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-30 15:47 [PATCH v3 0/5] tpm: retrieve digest size of unknown algorithms from TPM Roberto Sassu
2018-10-30 15:47 ` [PATCH v3 1/5] tpm: change the end marker of the active_banks array to zero Roberto Sassu
2018-10-30 19:45   ` Jarkko Sakkinen
2018-10-31 14:43   ` Mimi Zohar
2018-11-01 14:42     ` Mimi Zohar [this message]
2018-11-05  8:10       ` Roberto Sassu
2018-11-05 13:02         ` Mimi Zohar
2018-11-05  8:07     ` Roberto Sassu
2018-10-30 15:47 ` [PATCH v3 2/5] tpm: rename and export tpm2_digest and tpm2_algorithms Roberto Sassu
2018-10-30 15:47 ` [PATCH v3 3/5] tpm: modify tpm_pcr_read() definition to pass a TPM hash algorithm Roberto Sassu
2018-10-30 15:47 ` [PATCH v3 4/5] tpm: retrieve digest size of unknown algorithms with PCR read Roberto Sassu
2018-11-01 16:02   ` Mimi Zohar
2018-11-01 16:23     ` Mimi Zohar
2018-11-05  9:47     ` Roberto Sassu
2018-11-05 12:01       ` Jarkko Sakkinen
2018-11-05 13:09         ` Roberto Sassu
2018-11-05 14:48           ` Mimi Zohar
2018-11-05 17:13           ` Jarkko Sakkinen
2018-11-05 17:10         ` Jarkko Sakkinen
2018-10-30 15:47 ` [PATCH v3 5/5] tpm: ensure that output of PCR read contains the correct digest size Roberto Sassu
2018-10-30 19:52   ` Jarkko Sakkinen
2018-10-31  8:16     ` Roberto Sassu
2018-11-01 14:32       ` Jarkko Sakkinen
2018-11-01 16:52   ` Mimi Zohar

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