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Message-Id: <0af40351-91d5-d0a7-2965-0a9c6505af79@linux.ibm.com>
Date: Thu, 7 Feb 2019 18:29:43 -0500
From: Stefan Berger <stefanb@...ux.ibm.com>
To: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
Alexander Steffen <Alexander.Steffen@...ineon.com>
Cc: linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-security-module@...r.kernel.org,
Peter Huewe <PeterHuewe@....de>,
Jason Gunthorpe <jgg@...pe.ca>,
Tomas Winkler <tomas.winkler@...el.com>,
Tadeusz Struk <tadeusz.struk@...el.com>,
Stefan Berger <stefanb@...ux.vnet.ibm.com>,
Nayna Jain <nayna@...ux.ibm.com>
Subject: Re: [PATCH v11 00/16] Remove nested TPM operations
On 2/7/19 4:29 PM, Jarkko Sakkinen wrote:
> On Thu, Feb 07, 2019 at 07:41:56PM +0100, Alexander Steffen wrote:
>> On 06.02.2019 13:06, Jarkko Sakkinen wrote:
>>> On Wed, Feb 06, 2019 at 12:47:07AM +0200, Jarkko Sakkinen wrote:
>>>> Make the changes necessary to detach TPM space code and TPM activation
>>>> code out of the tpm_transmit() flow because of both of these can cause
>>>> nested tpm_transmit() calls. The nesteds calls make the whole flow hard
>>>> to maintain, and thus, it is better to just fix things now before this
>>>> turns into a bigger mess.
>>>>
>>>> v11:
>>>> * Drop the patch that tries to flush TPM space on system. Not a proper
>>>> fallback + out of scope for this patch set.
>>>>
>>>> v10:
>>>> * Use void pointers to avoid unnecessary casts in functions paramaters
>>>> where it makes sense.
>>>>
>>>> v9:
>>>> * Fixed again tpm_try_get_ops().
>>>> * Added missing reviewed-by's.
>>>>
>>>> v8:
>>>> * Re-add the check for ret < 0 after calling tpm_try_transmit() that
>>>> was dropped by mistake while moving code.
>>>> * Fix error fallback for tpm_try_get_ops() when tpm_chip_start()
>>>> fails.
>>>>
>>>> v7:
>>>> * Reorganize series so that more trivial and self-contained changes are
>>>> in the head.
>>>>
>>>> v6:
>>>> * When tpm_validate_commmand() was moved to tpm2-space.c, the struct for
>>>> the TPM header was incorrectly declared as struct tpm_input_header.
>>>> * Fix return value in tpm_validate_command().
>>>>
>>>> v5:
>>>> * Add the missing rev's from Stefan Berger.
>>>>
>>>> v4:
>>>> * Return 0 from pcrs_show() when tpm1_pcr_read() fails.
>>>> * Fix error handling flow in tpm_try_transmit().
>>>> * Replace struct tpm_input_header and struct tpm_output_header with
>>>> struct tpm_header.
>>>>
>>>> v3:
>>>> * Encapsulate power gating code to tpm_chip_start() and tpm_chip_stop().
>>>> * Move TPM power gating code and locking to tpm_try_get_ops() and
>>>> tpm_put_ops().
>>>> * Call power gating code directly in tpm_chip_register() and
>>>> tpm2_del_space().
>>>>
>>>> v2:
>>>> * Print tpm2_commit_space() error inside tpm2_commit_space()
>>>> * Error code was not printed when recv() callback failed. It is
>>>> fixed in this version.
>>>> * Added a patch that removes @space from tpm_transmit().
>>>> * Fixed a regression in earlier series. Forgot to amend the change
>>>> from the staging area that renames NESTED to UNLOCKED in tpm2-space.c.
>>>>
>>>> Jarkko Sakkinen (16):
>>>> tpm: use tpm_buf in tpm_transmit_cmd() as the IO parameter
>>>> tpm: fix invalid return value in pubek_show()
>>>> tpm: return 0 from pcrs_show() when tpm1_pcr_read() fails
>>>> tpm: print tpm2_commit_space() error inside tpm2_commit_space()
>>>> tpm: declare struct tpm_header
>>>> tpm: access command header through struct in tpm_try_transmit()
>>>> tpm: encapsulate tpm_dev_transmit()
>>>> tpm: clean up tpm_try_transmit() error handling flow
>>>> tpm: move tpm_validate_commmand() to tpm2-space.c
>>>> tpm: move TPM space code out of tpm_transmit()
>>>> tpm: remove @space from tpm_transmit()
>>>> tpm: use tpm_try_get_ops() in tpm-sysfs.c.
>>>> tpm: remove TPM_TRANSMIT_UNLOCKED flag
>>>> tpm: introduce tpm_chip_start() and tpm_chip_stop()
>>>> tpm: take TPM chip power gating out of tpm_transmit()
>>>> tpm: remove @flags from tpm_transmit()
>>>>
>>>> drivers/char/tpm/tpm-chip.c | 109 ++++++++++++
>>>> drivers/char/tpm/tpm-dev-common.c | 44 ++++-
>>>> drivers/char/tpm/tpm-interface.c | 264 ++++++------------------------
>>>> drivers/char/tpm/tpm-sysfs.c | 138 ++++++++++------
>>>> drivers/char/tpm/tpm.h | 64 +++-----
>>>> drivers/char/tpm/tpm1-cmd.c | 28 +---
>>>> drivers/char/tpm/tpm2-cmd.c | 72 +++-----
>>>> drivers/char/tpm/tpm2-space.c | 91 +++++++---
>>>> drivers/char/tpm/tpm_i2c_atmel.c | 5 +-
>>>> drivers/char/tpm/tpm_vtpm_proxy.c | 12 +-
>>>> drivers/char/tpm/xen-tpmfront.c | 2 +-
>>>> 11 files changed, 408 insertions(+), 421 deletions(-)
>>>>
>>>> --
>>>> 2.19.1
>>>>
>>> Applied to master and next.
>> Something in this series seems to break basic TPM communication for me.
>>
>> For TPM2.0s the probe command fails, causing them to be misdetected as
>> TPM1.2s:
>>
>> ---
>> tpm tpm0: tpm_try_transmit: tpm_send: error -5
>> tpm_tis MSFT0101:00: 1.2 TPM (device-id 0x1A, rev-id 22)
>> tpm tpm0: A TPM error (30) occurred attempting to determine the timeouts
>> ---
>> tpm tpm0: tpm_try_transmit: tpm_send: error -5
>> tpm_tis_spi spi0.1: 1.2 TPM (device-id 0x1B, rev-id 22)
>> tpm tpm0: A TPM error (30) occurred attempting to determine the timeouts
>> ---
>>
>> And for something that actually is a TPM1.2 it fails in a similar way:
>>
>> ---
>> tpm_i2c_infineon 1-0020: 1.2 TPM (device-id 0x1A)
>> tpm tpm0: A TPM error (-14) occurred attempting to determine the timeouts
>> ---
>> tpm tpm0: tpm_try_transmit: tpm_send: error -5
>> tpm_tis_spi spi0.1: 1.2 TPM (device-id 0x1B, rev-id 16)
>> tpm tpm0: A TPM error (-14) occurred attempting to determine the timeouts
>> tpm_tis_spi: probe of spi0.1 failed with error -14
>> ---
>>
>> I see this problem across my entire range of TPM devices and test platforms.
>> Any idea what could be wrong here?
> Weird.
>
> Can you run a bisect?
There are 2 bugs and the following overall patch against your tree fixes
them. Let me comment on the individual patches in v17. I missed those
obviously when testing with the tpm_vtpm_proxy...
diff --git a/drivers/char/tpm/tpm-interface.c
b/drivers/char/tpm/tpm-interface.c
index 02e8cffd1163..34c0da55d885 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -94,6 +94,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
void *buf, size_t bufsiz)
return rc;
}
+ rc = 0;
if (chip->flags & TPM_CHIP_FLAG_IRQ)
goto out_recv;
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index e74c5b7b64bf..52afe20cc8a1 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -799,7 +799,9 @@ int tpm2_probe(struct tpm_chip *chip)
tpm_buf_append_u32(&buf, TPM2_CAP_TPM_PROPERTIES);
tpm_buf_append_u32(&buf, TPM_PT_TOTAL_COMMANDS);
tpm_buf_append_u32(&buf, 1);
+ tpm_chip_start(chip);
rc = tpm_transmit_cmd(chip, &buf, 0, NULL);
+ tpm_chip_stop(chip);
/* We ignore TPM return codes on purpose. */
if (rc >= 0) {
out = (struct tpm_header *)buf.data;
>
> /Jarkko
>
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