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Message-ID: <774004d5-e17c-9f5d-f136-acd671350e7b@huawei.com>
Date: Mon, 5 Nov 2018 09:07:06 +0100
From: Roberto Sassu <roberto.sassu@...wei.com>
To: Mimi Zohar <zohar@...ux.ibm.com>, <jarkko.sakkinen@...ux.intel.com>
CC: <linux-integrity@...r.kernel.org>,
<linux-security-module@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <silviu.vlasceanu@...wei.com>
Subject: Re: [PATCH v3 1/5] tpm: change the end marker of the active_banks
array to zero
On 10/31/2018 3:43 PM, 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.
Thanks, I will use the text above as the patch description.
Roberto
>> Signed-off-by: Roberto Sassu <roberto.sassu@...wei.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++;
>> 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;
>
--
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