linux.git/drivers/char/tpm, branch v5.16

tpm_tis_spi: Add missing SPI ID

2021-10-26T02:03:34+00:00

In commit c46ed2281bbe ("tpm_tis_spi: add missing SPI device ID entries")
we added SPI IDs for all the DT aliases to handle the fact that we always
use SPI modaliases to load modules even when probed via DT however the
mentioned commit missed that the SPI and OF device ID entries did not
match and were different and so DT nodes with compatible
"tcg,tpm_tis-spi" will not match.  Add an extra ID for tpm_tis-spi
rather than just fix the existing one since what's currently there is
going to be better for anyone actually using SPI IDs to instantiate.

Fixes: c46ed2281bbe ("tpm_tis_spi: add missing SPI device ID entries")
Fixes: 96c8395e2166 ("spi: Revert modalias changes")
Signed-off-by: Mark Brown 
Reviewed-by: Jarkko Sakkinen 
Reviewed-by: Javier Martinez Canillas 
Signed-off-by: Jarkko Sakkinen

tpm: fix Atmel TPM crash caused by too frequent queries

2021-10-26T02:03:34+00:00

The Atmel TPM 1.2 chips crash with error
`tpm_try_transmit: send(): error -62` since kernel 4.14.
It is observed from the kernel log after running `tpm_sealdata -z`.
The error thrown from the command is as follows
```
$ tpm_sealdata -z
Tspi_Key_LoadKey failed: 0x00001087 - layer=tddl,
code=0087 (135), I/O error
```

The issue was reproduced with the following Atmel TPM chip:
```
$ tpm_version
T0  TPM 1.2 Version Info:
  Chip Version:        1.2.66.1
  Spec Level:          2
  Errata Revision:     3
  TPM Vendor ID:       ATML
  TPM Version:         01010000
  Manufacturer Info:   41544d4c
```

The root cause of the issue is due to the TPM calls to msleep()
were replaced with usleep_range() [1], which reduces
the actual timeout. Via experiments, it is observed that
the original msleep(5) actually sleeps for 15ms.
Because of a known timeout issue in Atmel TPM 1.2 chip,
the shorter timeout than 15ms can cause the error described above.

A few further changes in kernel 4.16 [2] and 4.18 [3, 4] further
reduced the timeout to less than 1ms. With experiments,
the problematic timeout in the latest kernel is the one
for `wait_for_tpm_stat`.

To fix it, the patch reverts the timeout of `wait_for_tpm_stat`
to 15ms for all Atmel TPM 1.2 chips, but leave it untouched
for Ateml TPM 2.0 chip, and chips from other vendors.
As explained above, the chosen 15ms timeout is
the actual timeout before this issue introduced,
thus the old value is used here.
Particularly, TPM_ATML_TIMEOUT_WAIT_STAT_MIN is set to 14700us,
TPM_ATML_TIMEOUT_WAIT_STAT_MIN is set to 15000us according to
the existing TPM_TIMEOUT_RANGE_US (300us).
The fixed has been tested in the system with the affected Atmel chip
with no issues observed after boot up.

References:
[1] 9f3fc7bcddcb tpm: replace msleep() with usleep_range() in TPM
1.2/2.0 generic drivers
[2] cf151a9a44d5 tpm: reduce tpm polling delay in tpm_tis_core
[3] 59f5a6b07f64 tpm: reduce poll sleep time in tpm_transmit()
[4] 424eaf910c32 tpm: reduce polling time to usecs for even finer
granularity

Fixes: 9f3fc7bcddcb ("tpm: replace msleep() with usleep_range() in TPM 1.2/2.0 generic drivers")
Link: https://patchwork.kernel.org/project/linux-integrity/patch/20200926223150.109645-1-hao.wu@rubrik.com/
Signed-off-by: Hao Wu 
Reviewed-by: Jarkko Sakkinen 
Signed-off-by: Jarkko Sakkinen

tpm: Check for integer overflow in tpm2_map_response_body()

2021-10-26T02:03:33+00:00

The "4 * be32_to_cpu(data->count)" multiplication can potentially
overflow which would lead to memory corruption.  Add a check for that.

Cc: stable@vger.kernel.org
Fixes: 745b361e989a ("tpm: infrastructure for TPM spaces")
Signed-off-by: Dan Carpenter 
Reviewed-by: Jarkko Sakkinen 
Signed-off-by: Jarkko Sakkinen

tpm: tis: Kconfig: Add helper dependency on COMPILE_TEST

2021-10-26T02:03:33+00:00

COMPILE_TEST is helpful to find compilation errors in other platform(e.g.X86).
In this case, the support of COMPILE_TEST is added, so this module could
be compiled in other platform(e.g.X86), without ARCH_SYNQUACER configuration.

Signed-off-by: Cai Huoqing 
Reviewed-by: Jarkko Sakkinen 
Signed-off-by: Jarkko Sakkinen

tpm: ibmvtpm: Avoid error message when process gets signal while waiting

2021-08-23T16:55:42+00:00

When rngd is run as root then lots of these types of message will appear
in the kernel log if the TPM has been configured to provide random bytes:

[ 7406.275163] tpm tpm0: tpm_transmit: tpm_recv: error -4

The issue is caused by the following call that is interrupted while
waiting for the TPM's response.

sig = wait_event_interruptible(ibmvtpm->wq, !ibmvtpm->tpm_processing_cmd);

Rather than waiting for the response in the low level driver, have it use
the polling loop in tpm_try_transmit() that uses a command's duration to
poll until a result has been returned by the TPM, thus ending when the
timeout has occurred but not responding to signals and ctrl-c anymore. To
stay in this polling loop extend tpm_ibmvtpm_status() to return
'true' for as long as the vTPM is indicated as being busy in
tpm_processing_cmd. Since the loop requires the TPM's timeouts, get them
now using tpm_get_timeouts() after setting the TPM2 version flag on the
chip.

To recreat the resolved issue start rngd like this:

sudo rngd -r /dev/hwrng -t
sudo rngd -r /dev/tpm0 -t

Link: https://bugzilla.redhat.com/show_bug.cgi?id=1981473
Fixes: 6674ff145eef ("tpm_ibmvtpm: properly handle interrupted packet receptions")
Cc: Nayna Jain 
Cc: George Wilson 
Reported-by: Nageswara R Sastry 
Signed-off-by: Stefan Berger 
Tested-by: Nageswara R Sastry 
Reviewed-by: Jarkko Sakkinen 
Signed-off-by: Jarkko Sakkinen

char: tpm: cr50_i2c: convert to new probe interface

2021-08-23T16:55:42+00:00

Way back when this driver was written the I2C framework
used to insist an ID table be defined even if the driver
did not use it in favor of ACPI/OF matching, so it was
added just to placate the hard I2C framework requirement.

This is no longer the case so we can drop the table and
also convert the driver to the new probe interface.

Signed-off-by: Adrian Ratiu 
Reviewed-by: Jarkko Sakkinen 
Signed-off-by: Jarkko Sakkinen

char: tpm: Kconfig: remove bad i2c cr50 select

2021-08-23T16:55:42+00:00

This fixes a minor bug which went unnoticed during the initial
driver upstreaming review: TCG_CR50 does not exist in mainline
kernels, so remove it.

Fixes: 3a253caaad11 ("char: tpm: add i2c driver for cr50")
Cc: stable@vger.kernel.org
Reviewed-by: Jarkko Sakkinen 
Signed-off-by: Adrian Ratiu 
Signed-off-by: Jarkko Sakkinen

tpm_ftpm_tee: Free and unregister TEE shared memory during kexec

2021-07-21T05:55:50+00:00

dma-buf backed shared memory cannot be reliably freed and unregistered
during a kexec operation even when tee_shm_free() is called on the shm
from a .shutdown hook. The problem occurs because dma_buf_put() calls
fput() which then uses task_work_add(), with the TWA_RESUME parameter,
to queue tee_shm_release() to be called before the current task returns
to user mode. However, the current task never returns to user mode
before the kexec completes so the memory is never freed nor
unregistered.

Use tee_shm_alloc_kernel_buf() to avoid dma-buf backed shared memory
allocation so that tee_shm_free() can directly call tee_shm_release().
This will ensure that the shm can be freed and unregistered during a
kexec operation.

Fixes: 09e574831b27 ("tpm/tpm_ftpm_tee: A driver for firmware TPM running inside TEE")
Fixes: 1760eb689ed6 ("tpm/tpm_ftpm_tee: add shutdown call back")
Cc: stable@vger.kernel.org
Signed-off-by: Tyler Hicks 
Reviewed-by: Sumit Garg 
Acked-by: Jarkko Sakkinen 
Signed-off-by: Jens Wiklander

tpm: Replace WARN_ONCE() with dev_err_once() in tpm_tis_status()

2021-06-23T13:51:04+00:00

Do not tear down the system when getting invalid status from a TPM chip.
This can happen when panic-on-warn is used.

Instead, introduce TPM_TIS_INVALID_STATUS bitflag and use it to trigger
once the error reporting per chip. In addition, print out the value of
TPM_STS for improved forensics.

Link: https://lore.kernel.org/keyrings/YKzlTR1AzUigShtZ@kroah.com/
Fixes: 55707d531af6 ("tpm_tis: Add a check for invalid status")
Cc: stable@vger.kernel.org
Signed-off-by: Jarkko Sakkinen 
Reviewed-by: Greg Kroah-Hartman

tpm_tis: Use DEFINE_RES_MEM() to simplify code

2021-06-23T13:51:03+00:00

Use DEFINE_RES_MEM() to save a couple of lines of code, which is simpler
and more readable. The start address does not need to appear twice.

Signed-off-by: Zhen Lei 
Reviewed-by: Jarkko Sakkinen 
Signed-off-by: Jarkko Sakkinen