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[PATCH v3 1/2] tee: optee: Fix supplicant based device enumeration

Sumit Garg posted 2 patches 2 years, 2 months ago
There is a newer version of this series
[PATCH v3 1/2] tee: optee: Fix supplicant based device enumeration
Posted by Sumit Garg 2 years, 2 months ago 
Currently supplicant dependent optee device enumeration only registers
devices whenever tee-supplicant is invoked for the first time. But it
forgets to remove devices when tee-supplicant daemon stops running and
closes its context gracefully. This leads to following error for fTPM
driver during reboot/shutdown:

[   73.466791] tpm tpm0: ftpm_tee_tpm_op_send: SUBMIT_COMMAND invoke error: 0xffff3024

Fix this by separating supplicant dependent devices so that the
user-space service can detach supplicant devices before closing the
supplicant.

Reported-by: Jan Kiszka <jan.kiszka@siemens.com>
Link: https://github.com/OP-TEE/optee_os/issues/6094
Fixes: 5f178bb71e3a ("optee: enable support for multi-stage bus enumeration")
Tested-by: Jan Kiszka <jan.kiszka@siemens.com>
Tested-by: Masahisa Kojima <masahisa.kojima@linaro.org>
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
---
 drivers/tee/optee/device.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/tee/optee/device.c b/drivers/tee/optee/device.c
index 64f0e047c23d..78fc0a15c463 100644
--- a/drivers/tee/optee/device.c
+++ b/drivers/tee/optee/device.c
@@ -60,9 +60,10 @@ static void optee_release_device(struct device *dev)
 	kfree(optee_device);
 }
 
-static int optee_register_device(const uuid_t *device_uuid)
+static int optee_register_device(const uuid_t *device_uuid, u32 func)
 {
 	struct tee_client_device *optee_device = NULL;
+	const char *dev_name_fmt = NULL;
 	int rc;
 
 	optee_device = kzalloc(sizeof(*optee_device), GFP_KERNEL);
@@ -71,7 +72,13 @@ static int optee_register_device(const uuid_t *device_uuid)
 
 	optee_device->dev.bus = &tee_bus_type;
 	optee_device->dev.release = optee_release_device;
-	if (dev_set_name(&optee_device->dev, "optee-ta-%pUb", device_uuid)) {
+
+	if (func == PTA_CMD_GET_DEVICES_SUPP)
+		dev_name_fmt = "optee-ta-supp-%pUb";
+	else
+		dev_name_fmt = "optee-ta-%pUb";
+
+	if (dev_set_name(&optee_device->dev, dev_name_fmt, device_uuid)) {
 		kfree(optee_device);
 		return -ENOMEM;
 	}
@@ -142,7 +149,7 @@ static int __optee_enumerate_devices(u32 func)
 	num_devices = shm_size / sizeof(uuid_t);
 
 	for (idx = 0; idx < num_devices; idx++) {
-		rc = optee_register_device(&device_uuid[idx]);
+		rc = optee_register_device(&device_uuid[idx], func);
 		if (rc)
 			goto out_shm;
 	}
-- 
2.34.1
Re: [PATCH v3 1/2] tee: optee: Fix supplicant based device enumeration
Posted by Jerome Forissier 2 years, 2 months ago 

On 10/30/23 16:59, Sumit Garg wrote:
> Currently supplicant dependent optee device enumeration only registers
> devices whenever tee-supplicant is invoked for the first time. But it
> forgets to remove devices when tee-supplicant daemon stops running and
> closes its context gracefully. This leads to following error for fTPM
> driver during reboot/shutdown:
> 
> [   73.466791] tpm tpm0: ftpm_tee_tpm_op_send: SUBMIT_COMMAND invoke error: 0xffff3024
> 
> Fix this by separating supplicant dependent devices so that the
> user-space service can detach supplicant devices before closing the
> supplicant.
> 
> Reported-by: Jan Kiszka <jan.kiszka@siemens.com>
> Link: https://github.com/OP-TEE/optee_os/issues/6094
> Fixes: 5f178bb71e3a ("optee: enable support for multi-stage bus enumeration")
> Tested-by: Jan Kiszka <jan.kiszka@siemens.com>
> Tested-by: Masahisa Kojima <masahisa.kojima@linaro.org>
> Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
> ---
>  drivers/tee/optee/device.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/tee/optee/device.c b/drivers/tee/optee/device.c
> index 64f0e047c23d..78fc0a15c463 100644
> --- a/drivers/tee/optee/device.c
> +++ b/drivers/tee/optee/device.c
> @@ -60,9 +60,10 @@ static void optee_release_device(struct device *dev)
>  	kfree(optee_device);
>  }
>  
> -static int optee_register_device(const uuid_t *device_uuid)
> +static int optee_register_device(const uuid_t *device_uuid, u32 func)
>  {
>  	struct tee_client_device *optee_device = NULL;
> +	const char *dev_name_fmt = NULL;
>  	int rc;
>  
>  	optee_device = kzalloc(sizeof(*optee_device), GFP_KERNEL);
> @@ -71,7 +72,13 @@ static int optee_register_device(const uuid_t *device_uuid)
>  
>  	optee_device->dev.bus = &tee_bus_type;
>  	optee_device->dev.release = optee_release_device;
> -	if (dev_set_name(&optee_device->dev, "optee-ta-%pUb", device_uuid)) {
> +
> +	if (func == PTA_CMD_GET_DEVICES_SUPP)
> +		dev_name_fmt = "optee-ta-supp-%pUb";
> +	else
> +		dev_name_fmt = "optee-ta-%pUb";

That's an ABI change, isn't it?

> +
> +	if (dev_set_name(&optee_device->dev, dev_name_fmt, device_uuid)) {
>  		kfree(optee_device);
>  		return -ENOMEM;
>  	}
> @@ -142,7 +149,7 @@ static int __optee_enumerate_devices(u32 func)
>  	num_devices = shm_size / sizeof(uuid_t);
>  
>  	for (idx = 0; idx < num_devices; idx++) {
> -		rc = optee_register_device(&device_uuid[idx]);
> +		rc = optee_register_device(&device_uuid[idx], func);
>  		if (rc)
>  			goto out_shm;
>  	}

-- 
Jerome
Re: [PATCH v3 1/2] tee: optee: Fix supplicant based device enumeration
Posted by Jan Kiszka 2 years, 2 months ago 
On 31.10.23 12:04, Jerome Forissier wrote:
> 
> 
> On 10/30/23 16:59, Sumit Garg wrote:
>> Currently supplicant dependent optee device enumeration only registers
>> devices whenever tee-supplicant is invoked for the first time. But it
>> forgets to remove devices when tee-supplicant daemon stops running and
>> closes its context gracefully. This leads to following error for fTPM
>> driver during reboot/shutdown:
>>
>> [   73.466791] tpm tpm0: ftpm_tee_tpm_op_send: SUBMIT_COMMAND invoke error: 0xffff3024
>>
>> Fix this by separating supplicant dependent devices so that the
>> user-space service can detach supplicant devices before closing the
>> supplicant.
>>
>> Reported-by: Jan Kiszka <jan.kiszka@siemens.com>
>> Link: https://github.com/OP-TEE/optee_os/issues/6094
>> Fixes: 5f178bb71e3a ("optee: enable support for multi-stage bus enumeration")
>> Tested-by: Jan Kiszka <jan.kiszka@siemens.com>
>> Tested-by: Masahisa Kojima <masahisa.kojima@linaro.org>
>> Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
>> ---
>>  drivers/tee/optee/device.c | 13 ++++++++++---
>>  1 file changed, 10 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/tee/optee/device.c b/drivers/tee/optee/device.c
>> index 64f0e047c23d..78fc0a15c463 100644
>> --- a/drivers/tee/optee/device.c
>> +++ b/drivers/tee/optee/device.c
>> @@ -60,9 +60,10 @@ static void optee_release_device(struct device *dev)
>>  	kfree(optee_device);
>>  }
>>  
>> -static int optee_register_device(const uuid_t *device_uuid)
>> +static int optee_register_device(const uuid_t *device_uuid, u32 func)
>>  {
>>  	struct tee_client_device *optee_device = NULL;
>> +	const char *dev_name_fmt = NULL;
>>  	int rc;
>>  
>>  	optee_device = kzalloc(sizeof(*optee_device), GFP_KERNEL);
>> @@ -71,7 +72,13 @@ static int optee_register_device(const uuid_t *device_uuid)
>>  
>>  	optee_device->dev.bus = &tee_bus_type;
>>  	optee_device->dev.release = optee_release_device;
>> -	if (dev_set_name(&optee_device->dev, "optee-ta-%pUb", device_uuid)) {
>> +
>> +	if (func == PTA_CMD_GET_DEVICES_SUPP)
>> +		dev_name_fmt = "optee-ta-supp-%pUb";
>> +	else
>> +		dev_name_fmt = "optee-ta-%pUb";
> 
> That's an ABI change, isn't it?

Oh, here did this come from! Yes, I recently had to adjust some systemd
service due to carrying this patch but looking for the change only in 
upstream:

https://github.com/ilbers/isar/commit/83644ddf694e51f11793e6107e4aaf68dc0043a5

Jan

> 
>> +
>> +	if (dev_set_name(&optee_device->dev, dev_name_fmt, device_uuid)) {
>>  		kfree(optee_device);
>>  		return -ENOMEM;
>>  	}
>> @@ -142,7 +149,7 @@ static int __optee_enumerate_devices(u32 func)
>>  	num_devices = shm_size / sizeof(uuid_t);
>>  
>>  	for (idx = 0; idx < num_devices; idx++) {
>> -		rc = optee_register_device(&device_uuid[idx]);
>> +		rc = optee_register_device(&device_uuid[idx], func);
>>  		if (rc)
>>  			goto out_shm;
>>  	}
> 

-- 
Siemens AG, Technology
Linux Expert Center
Re: [PATCH v3 1/2] tee: optee: Fix supplicant based device enumeration
Posted by Sumit Garg 2 years, 1 month ago 
On Tue, 31 Oct 2023 at 17:14, Jan Kiszka <jan.kiszka@siemens.com> wrote:
>
> On 31.10.23 12:04, Jerome Forissier wrote:
> >
> >
> > On 10/30/23 16:59, Sumit Garg wrote:
> >> Currently supplicant dependent optee device enumeration only registers
> >> devices whenever tee-supplicant is invoked for the first time. But it
> >> forgets to remove devices when tee-supplicant daemon stops running and
> >> closes its context gracefully. This leads to following error for fTPM
> >> driver during reboot/shutdown:
> >>
> >> [   73.466791] tpm tpm0: ftpm_tee_tpm_op_send: SUBMIT_COMMAND invoke error: 0xffff3024
> >>
> >> Fix this by separating supplicant dependent devices so that the
> >> user-space service can detach supplicant devices before closing the
> >> supplicant.
> >>
> >> Reported-by: Jan Kiszka <jan.kiszka@siemens.com>
> >> Link: https://github.com/OP-TEE/optee_os/issues/6094
> >> Fixes: 5f178bb71e3a ("optee: enable support for multi-stage bus enumeration")
> >> Tested-by: Jan Kiszka <jan.kiszka@siemens.com>
> >> Tested-by: Masahisa Kojima <masahisa.kojima@linaro.org>
> >> Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
> >> ---
> >>  drivers/tee/optee/device.c | 13 ++++++++++---
> >>  1 file changed, 10 insertions(+), 3 deletions(-)
> >>
> >> diff --git a/drivers/tee/optee/device.c b/drivers/tee/optee/device.c
> >> index 64f0e047c23d..78fc0a15c463 100644
> >> --- a/drivers/tee/optee/device.c
> >> +++ b/drivers/tee/optee/device.c
> >> @@ -60,9 +60,10 @@ static void optee_release_device(struct device *dev)
> >>      kfree(optee_device);
> >>  }
> >>
> >> -static int optee_register_device(const uuid_t *device_uuid)
> >> +static int optee_register_device(const uuid_t *device_uuid, u32 func)
> >>  {
> >>      struct tee_client_device *optee_device = NULL;
> >> +    const char *dev_name_fmt = NULL;
> >>      int rc;
> >>
> >>      optee_device = kzalloc(sizeof(*optee_device), GFP_KERNEL);
> >> @@ -71,7 +72,13 @@ static int optee_register_device(const uuid_t *device_uuid)
> >>
> >>      optee_device->dev.bus = &tee_bus_type;
> >>      optee_device->dev.release = optee_release_device;
> >> -    if (dev_set_name(&optee_device->dev, "optee-ta-%pUb", device_uuid)) {
> >> +
> >> +    if (func == PTA_CMD_GET_DEVICES_SUPP)
> >> +            dev_name_fmt = "optee-ta-supp-%pUb";
> >> +    else
> >> +            dev_name_fmt = "optee-ta-%pUb";
> >
> > That's an ABI change, isn't it?
>

Indeed it is an ABI break although we would like this to be backported
but don't want to break existing users. So I brainstormed on it and
came up with an alternative fix via device attribute in v4. Please
have a look.

> Oh, here did this come from! Yes, I recently had to adjust some systemd
> service due to carrying this patch but looking for the change only in
> upstream:
>
> https://github.com/ilbers/isar/commit/83644ddf694e51f11793e6107e4aaf68dc0043a5
>

You don't need to unbind all of the optee devices. v4 would help you
to maintain backwards compatibility, can you retest it?

-Sumit

> Jan
>
> >
> >> +
> >> +    if (dev_set_name(&optee_device->dev, dev_name_fmt, device_uuid)) {
> >>              kfree(optee_device);
> >>              return -ENOMEM;
> >>      }
> >> @@ -142,7 +149,7 @@ static int __optee_enumerate_devices(u32 func)
> >>      num_devices = shm_size / sizeof(uuid_t);
> >>
> >>      for (idx = 0; idx < num_devices; idx++) {
> >> -            rc = optee_register_device(&device_uuid[idx]);
> >> +            rc = optee_register_device(&device_uuid[idx], func);
> >>              if (rc)
> >>                      goto out_shm;
> >>      }
> >
>
> --
> Siemens AG, Technology
> Linux Expert Center
>

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