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: Thu, 29 Nov 2018 13:04:40 +0100 [thread overview]
Message-ID: <4a55ba02-87e6-9258-038e-e4c57f00f033@huawei.com> (raw)
In-Reply-To: <1602133e-6a41-ea97-d985-6eca0831898d@huawei.com>
On 11/28/2018 1:17 PM, Roberto Sassu wrote:
> 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.
> */
>
If this comment is ok, I will send a new version of the patch set.
Roberto
>> /Jarkko
>>
>
--
HUAWEI TECHNOLOGIES Duesseldorf GmbH, HRB 56063
Managing Director: Bo PENG, Jian LI, Yanli SHI
next prev parent reply other threads:[~2018-11-29 12:05 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
2018-11-29 12:04 ` Roberto Sassu [this message]
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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