Commit 0f4fa213 authored by Josh Zimmerman's avatar Josh Zimmerman Committed by Greg Kroah-Hartman

tpm: Issue a TPM2_Shutdown for TPM2 devices.

commit d1bd4a79 upstream.

If a TPM2 loses power without a TPM2_Shutdown command being issued (a
"disorderly reboot"), it may lose some state that has yet to be
persisted to NVRam, and will increment the DA counter. After the DA
counter gets sufficiently large, the TPM will lock the user out.

NOTE: This only changes behavior on TPM2 devices. Since TPM1 uses sysfs,
and sysfs relies on implicit locking on chip->ops, it is not safe to
allow this code to run in TPM1, or to add sysfs support to TPM2, until
that locking is made explicit.
Signed-off-by: default avatarJosh Zimmerman <joshz@google.com>
Cc: stable@vger.kernel.org
Fixes: 74d6b3ce ("tpm: fix suspend/resume paths for TPM 2.0")
Reviewed-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: default avatarJames Morris <james.l.morris@oracle.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 5c9a2972
...@@ -124,6 +124,41 @@ static void tpm_dev_release(struct device *dev) ...@@ -124,6 +124,41 @@ static void tpm_dev_release(struct device *dev)
kfree(chip); kfree(chip);
} }
/**
* tpm_class_shutdown() - prepare the TPM device for loss of power.
* @dev: device to which the chip is associated.
*
* Issues a TPM2_Shutdown command prior to loss of power, as required by the
* TPM 2.0 spec.
* Then, calls bus- and device- specific shutdown code.
*
* XXX: This codepath relies on the fact that sysfs is not enabled for
* TPM2: sysfs uses an implicit lock on chip->ops, so this could race if TPM2
* has sysfs support enabled before TPM sysfs's implicit locking is fixed.
*/
static int tpm_class_shutdown(struct device *dev)
{
struct tpm_chip *chip = container_of(dev, struct tpm_chip, dev);
if (chip->flags & TPM_CHIP_FLAG_TPM2) {
down_write(&chip->ops_sem);
tpm2_shutdown(chip, TPM2_SU_CLEAR);
chip->ops = NULL;
up_write(&chip->ops_sem);
}
/* Allow bus- and device-specific code to run. Note: since chip->ops
* is NULL, more-specific shutdown code will not be able to issue TPM
* commands.
*/
if (dev->bus && dev->bus->shutdown)
dev->bus->shutdown(dev);
else if (dev->driver && dev->driver->shutdown)
dev->driver->shutdown(dev);
return 0;
}
/** /**
* tpmm_chip_alloc() - allocate a new struct tpm_chip instance * tpmm_chip_alloc() - allocate a new struct tpm_chip instance
* @dev: device to which the chip is associated * @dev: device to which the chip is associated
...@@ -166,6 +201,7 @@ struct tpm_chip *tpmm_chip_alloc(struct device *dev, ...@@ -166,6 +201,7 @@ struct tpm_chip *tpmm_chip_alloc(struct device *dev,
dev_set_drvdata(dev, chip); dev_set_drvdata(dev, chip);
chip->dev.class = tpm_class; chip->dev.class = tpm_class;
chip->dev.class->shutdown = tpm_class_shutdown;
chip->dev.release = tpm_dev_release; chip->dev.release = tpm_dev_release;
chip->dev.parent = dev; chip->dev.parent = dev;
#ifdef CONFIG_ACPI #ifdef CONFIG_ACPI
......
...@@ -284,6 +284,13 @@ static const struct attribute_group tpm_dev_group = { ...@@ -284,6 +284,13 @@ static const struct attribute_group tpm_dev_group = {
int tpm_sysfs_add_device(struct tpm_chip *chip) int tpm_sysfs_add_device(struct tpm_chip *chip)
{ {
int err; int err;
/* XXX: If you wish to remove this restriction, you must first update
* tpm_sysfs to explicitly lock chip->ops.
*/
if (chip->flags & TPM_CHIP_FLAG_TPM2)
return 0;
err = sysfs_create_group(&chip->dev.parent->kobj, err = sysfs_create_group(&chip->dev.parent->kobj,
&tpm_dev_group); &tpm_dev_group);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment