From: Jeremy Cline <jeremy@jcline.org>
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Thiebaud Weksteen <tweek@google.com>
Cc: Hans de Goede <hdegoede@redhat.com>,
Javier Martinez Canillas <javierm@redhat.com>,
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
linux-efi@vger.kernel.org, linux-integrity@vger.kernel.org,
tpmdd-devel@lists.sourceforge.net,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Regression from efi: call get_event_log before ExitBootServices
Date: Mon, 12 Mar 2018 14:30:05 +0000 [thread overview]
Message-ID: <010001621a9e5069-0b1a6328-97e4-4396-9438-b90f5b8c82a4-000000@email.amazonses.com> (raw)
In-Reply-To: <CAKv+Gu-KPU+kQ0z3jJ+CcgNPq3PuqjF_CCB_2LR_5VoYaynTJw@mail.gmail.com>
On 03/12/2018 07:08 AM, Ard Biesheuvel wrote:
> On 10 March 2018 at 10:45, Thiebaud Weksteen <tweek@google.com> wrote:
>> On Fri, Mar 9, 2018 at 5:54 PM Jeremy Cline <jeremy@jcline.org> wrote:
>>
>>> On Fri, Mar 09, 2018 at 10:43:50AM +0000, Thiebaud Weksteen wrote:
>>>> Thanks a lot for trying out the patch!
>>>>
>>>> Please don't modify your install at this stage, I think we are hitting a
>>>> firmware bug and that would be awesome if we can fix how we are
>> handling it.
>>>> So, if we reach that stage in the function it could either be that:
>>>> * The allocation did not succeed, somehow, but the firmware still
>> returned
>>>> EFI_SUCCEED.
>>>> * The size requested is incorrect (I'm thinking something like a 1G of
>>>> log). This would be due to either a miscalculation of log_size
>> (possible)
>>>> or; the returned values of GetEventLog are not correct.
>>>> I'm sending a patch to add checks for these. Could you please apply and
>>>> retest?
>>>> Again, thanks for helping debugging this.
>>
>>> No problem, thanks for the help :)
>>
>>> With the new patch:
>>
>>> Locating the TCG2Protocol
>>> Calling GetEventLog on TCG2Protocol
>>> Log returned
>>> log_location is not empty
>>> log_size != 0
>>> log_size < 1M
>>> Allocating memory for storing the logs
>>> Returned from memory allocation
>>> Copying log to new location
>>
>>> And then it hangs. I added a couple more print statements:
>>
>>> diff --git a/drivers/firmware/efi/libstub/tpm.c
>> b/drivers/firmware/efi/libstub/tpm.c
>>> index ee3fac109078..1ab5638bc50e 100644
>>> --- a/drivers/firmware/efi/libstub/tpm.c
>>> +++ b/drivers/firmware/efi/libstub/tpm.c
>>> @@ -148,8 +148,11 @@ void
>> efi_retrieve_tpm2_eventlog_1_2(efi_system_table_t *sys_table_arg)
>>> efi_printk(sys_table_arg, "Copying log to new location\n");
>>
>>> memset(log_tbl, 0, sizeof(*log_tbl) + log_size);
>>> + efi_printk(sys_table_arg, "Successfully memset log_tbl to 0\n");
>>> log_tbl->size = log_size;
>>> + efi_printk(sys_table_arg, "Set log_tbl->size\n");
>>> log_tbl->version = EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;
>>> + efi_printk(sys_table_arg, "Set log_tbl-version\n");
>>> memcpy(log_tbl->log, (void *) first_entry_addr, log_size);
>>
>>> efi_printk(sys_table_arg, "Installing the log into the
>> configuration table\n");
>>
>>> and it's hanging at "memset(log_tbl, 0, sizeof(*log_tbl) + log_size);"
>>
>> Thanks. Well, it looks like the memory that is supposedly allocated is not
>> usable. I'm thinking this is a firmware bug.
>> Ard, would you agree on this assumption? Thoughts on how to proceed?
>>
>
> I am rather puzzled why the allocate_pool() should succeed and the
> subsequent memset() should fail. This does not look like an issue that
> is intimately related to TPM2 support, rather an issue in the firmware
> that happens to get tickled after the change.
>
> Would you mind trying replacing EFI_LOADER_DATA with
> EFI_BOOT_SERVICES_DATA in the allocate_pool() call?
Replacing EFI_LOADER_DATA with EFI_BOOT_SERVICES_DATA still hangs at the
memset() call.
Regards,
Jeremy
next prev parent reply other threads:[~2018-03-12 14:30 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-06 16:00 Regression from efi: call get_event_log before ExitBootServices Jeremy Cline
[not found] ` <01000161fc0b4755-df0621f4-ab5d-479a-b425-adf98427a308-000000-p/GC64/jrecnJqMo6gzdpkEOCMrvLtNR@public.gmane.org>
2018-03-07 8:41 ` Thiebaud Weksteen via tpmdd-devel
2018-03-07 11:16 ` Hans de Goede
2018-03-07 12:00 ` Javier Martinez Canillas
2018-03-07 17:33 ` Jeremy Cline
2018-03-08 8:45 ` Thiebaud Weksteen
2018-03-08 18:20 ` Jeremy Cline
[not found] ` <e7c2be5c-cf21-fc2d-efda-d9222d93ffad@redhat.com>
[not found] ` <b32f335c-0d77-1749-f7fe-65f512280255@redhat.com>
[not found] ` <ade378f6-c997-1d48-a30d-cceee6435fc8@redhat.com>
[not found] ` <a3b5f822-f8f4-e2f5-46da-e23e13174f28@redhat.com>
2018-03-08 16:50 ` Hans de Goede
2018-03-08 17:26 ` Jeremy Cline
2018-03-09 9:29 ` Hans de Goede
2018-03-09 10:43 ` Thiebaud Weksteen
2018-03-09 16:54 ` Jeremy Cline
2018-03-10 10:45 ` Thiebaud Weksteen
2018-03-12 10:17 ` Jarkko Sakkinen
2018-03-12 10:41 ` Paul Menzel
2018-03-16 13:01 ` Jarkko Sakkinen
2018-03-12 11:08 ` Ard Biesheuvel
2018-03-12 14:30 ` Jeremy Cline [this message]
2018-03-12 14:56 ` Ard Biesheuvel
2018-03-12 17:01 ` Jeremy Cline
2018-03-12 17:30 ` Ard Biesheuvel
2018-03-12 18:29 ` Thiebaud Weksteen
2018-03-12 18:33 ` Jeremy Cline
2018-03-12 19:55 ` Thiebaud Weksteen
2018-03-12 21:02 ` Ard Biesheuvel
2018-03-13 7:24 ` Thiebaud Weksteen
2018-03-13 8:08 ` Hans de Goede
2018-03-13 1:50 ` Jeremy Cline
2018-03-13 7:47 ` Hans de Goede
2018-03-13 7:59 ` Ard Biesheuvel
2018-03-13 8:02 ` Ard Biesheuvel
2018-03-13 10:23 ` Thiebaud Weksteen
2018-03-13 10:30 ` Ard Biesheuvel
2018-03-13 13:41 ` Jeremy Cline
2018-03-13 13:43 ` Ard Biesheuvel
2018-03-13 15:00 ` Thiebaud Weksteen
2018-03-13 12:51 ` Andy Shevchenko
2018-03-12 18:30 ` Jeremy Cline
2018-03-09 17:03 ` James Bottomley
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