Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [PATCH v5 2/7] tpm: remove definition of TPM2_ACTIVE_PCR_BANKS
To:     Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
CC:     <zohar@linux.ibm.com>, <david.safford@ge.com>,
        <monty.wiseman@ge.com>, <linux-integrity@vger.kernel.org>,
        <linux-security-module@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <silviu.vlasceanu@huawei.com>
References: <20181114153108.12907-1-roberto.sassu@huawei.com>
 <20181114153108.12907-3-roberto.sassu@huawei.com>
 <20181116133851.GB4163@linux.intel.com>
From:   Roberto Sassu <roberto.sassu@huawei.com>
Message-ID: <5c4866e4-dee0-730c-f08b-8ea8d00dbd96@huawei.com>
Date:   Wed, 28 Nov 2018 08:50:26 +0100
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101
 Thunderbird/60.3.0
MIME-Version: 1.0
In-Reply-To: <20181116133851.GB4163@linux.intel.com>
Content-Type: text/plain; charset="utf-8"; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 11/16/2018 2:38 PM, Jarkko Sakkinen wrote:
> On Wed, Nov 14, 2018 at 04:31:03PM +0100, Roberto Sassu wrote:
>> tcg_efi_specid_event and tcg_pcr_event2 declaration contains static arrays
>> for a list of hash algorithms used for event logs and event log digests.
>>
>> However, according to TCG EFI Protocol Specification, these arrays have
>> variable sizes. Setting the array size to zero or 3 does not make any
>> difference, because the parser has to adjust the offset depending on the
>> actual array size to access structure members after the static arrays.
>>
>> Thus, this patch removes the declaration of TPM2_ACTIVE_PCR_BANKS and sets
>> the array size to zero.
>>
>> Fixes: 4d23cc323cdb ("tpm: add securityfs support for TPM 2.0 firmware
>> event log")
>>
>> Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
>> ---
>>   include/linux/tpm_eventlog.h | 5 ++---
>>   1 file changed, 2 insertions(+), 3 deletions(-)
>>
>> diff --git a/include/linux/tpm_eventlog.h b/include/linux/tpm_eventlog.h
>> index 20d9da77fc11..3d5d162f09cc 100644
>> --- a/include/linux/tpm_eventlog.h
>> +++ b/include/linux/tpm_eventlog.h
>> @@ -8,7 +8,6 @@
>>   #define TCG_EVENT_NAME_LEN_MAX	255
>>   #define MAX_TEXT_EVENT		1000	/* Max event string length */
>>   #define ACPI_TCPA_SIG		"TCPA"	/* 0x41504354 /'TCPA' */
>> -#define TPM2_ACTIVE_PCR_BANKS	3
>>   
>>   #define EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2 0x1
>>   #define EFI_TCG2_EVENT_LOG_FORMAT_TCG_2   0x2
>> @@ -90,7 +89,7 @@ struct tcg_efi_specid_event {
>>   	u8 spec_errata;
>>   	u8 uintnsize;
>>   	u32 num_algs;
>> -	struct tcg_efi_specid_event_algs digest_sizes[TPM2_ACTIVE_PCR_BANKS];
>> +	struct tcg_efi_specid_event_algs digest_sizes[0];
>>   	u8 vendor_info_size;
>>   	u8 vendor_info[0];
>>   } __packed;
>> @@ -117,7 +116,7 @@ struct tcg_pcr_event2 {
>>   	u32 pcr_idx;
>>   	u32 event_type;
>>   	u32 count;
>> -	struct tpm2_digest digests[TPM2_ACTIVE_PCR_BANKS];
>> +	struct tpm2_digest digests[0];
>>   	struct tcg_event_field event;
>>   } __packed;
>>   
>> -- 
>> 2.17.1
>>
> 
> NAK for the same reason as last time.

No Fixes tag, or Fixes tag without newline?

Roberto


> /Jarkko
> 

-- 
HUAWEI TECHNOLOGIES Duesseldorf GmbH, HRB 56063
Managing Director: Bo PENG, Jian LI, Yanli SHI