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From: Roberto Sassu <roberto.sassu@huawei.com>
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>
Subject: Re: [PATCH v5 2/7] tpm: remove definition of TPM2_ACTIVE_PCR_BANKS
Date: Wed, 28 Nov 2018 13:17:22 +0100	[thread overview]
Message-ID: <1602133e-6a41-ea97-d985-6eca0831898d@huawei.com> (raw)
In-Reply-To: <20181116133851.GB4163@linux.intel.com>

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.

I added this comment to include/linux/tpm_eventlog.h:

/*
  * http://www.trustedcomputinggroup.org/tcg-efi-protocol-specification/
  *
  * Set the size of 'digest_sizes' and 'digests', members of 
tcg_efi_specid_event
  * and tcg_pcr_event2, to zero. Structures with variable-sized arrays 
placed
  * midway are not suitable for type casting.
  */

Is it ok?

Thanks

Roberto


> /Jarkko
> 

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

  parent reply	other threads:[~2018-11-28 12:17 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-14 15:31 [PATCH v5 0/7] tpm: retrieve digest size of unknown algorithms from TPM Roberto Sassu
2018-11-14 15:31 ` [PATCH v5 1/7] tpm: dynamically allocate the allocated_banks array Roberto Sassu
2018-11-16 13:36   ` Jarkko Sakkinen
2018-11-14 15:31 ` [PATCH v5 2/7] tpm: remove definition of TPM2_ACTIVE_PCR_BANKS Roberto Sassu
2018-11-16 13:38   ` Jarkko Sakkinen
2018-11-28  7:50     ` Roberto Sassu
2018-11-28 12:17     ` Roberto Sassu [this message]
2018-11-29 12:04       ` Roberto Sassu
2018-11-30 19:41         ` Jarkko Sakkinen
2018-11-30 19:45           ` Jarkko Sakkinen
2018-11-30 22:18             ` Jarkko Sakkinen
2018-12-03  9:59             ` Roberto Sassu
2018-12-03 17:31               ` Jarkko Sakkinen
2018-11-14 15:31 ` [PATCH v5 3/7] tpm: rename and export tpm2_digest and tpm2_algorithms Roberto Sassu
2018-11-14 15:31 ` [PATCH v5 4/7] tpm: modify tpm_pcr_read() definition to pass a TPM hash algorithm Roberto Sassu
2018-11-16 13:41   ` Jarkko Sakkinen
2018-11-14 15:31 ` [PATCH v5 5/7] tpm: retrieve digest size of unknown algorithms with PCR read Roberto Sassu
2018-11-14 15:31 ` [PATCH v5 6/7] tpm: ensure that the output of PCR read contains the correct digest size Roberto Sassu
2018-11-16 13:41   ` Jarkko Sakkinen
2018-11-16 16:06     ` Roberto Sassu
2018-11-18  7:32       ` Jarkko Sakkinen
2018-11-19  8:14         ` Roberto Sassu
2018-11-19 14:33           ` Jarkko Sakkinen
2018-11-19 15:09             ` Roberto Sassu
2018-11-19 16:07               ` Jarkko Sakkinen
2018-11-28  8:40                 ` Roberto Sassu
2018-11-28 19:19                   ` Jarkko Sakkinen
2018-11-14 15:31 ` [PATCH v5 7/7] tpm: pass an array of tpm_bank_list structures to tpm_pcr_extend() Roberto Sassu
2018-11-16 15:03   ` Jarkko Sakkinen
2018-11-16 15:55     ` Roberto Sassu
2018-11-18  7:27       ` Jarkko Sakkinen
2018-11-19  4:57         ` Mimi Zohar
2018-11-19  8:16           ` Roberto Sassu
2018-11-19 14:33             ` Mimi Zohar
2018-11-19 14:39             ` Jarkko Sakkinen
2018-11-18  7:29       ` Jarkko Sakkinen
2018-11-19  8:22         ` Roberto Sassu
2018-11-19 14:42           ` Jarkko Sakkinen

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