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Add Access Control List to MPU ports (#765)

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This PR adds Access Control to kernel objects on a per task basis to MPU
ports. The following needs to be defined in the `FreeRTOSConfig.h` to
enable this feature:

```c
#define configUSE_MPU_WRAPPERS_V1 0
#define configENABLE_ACCESS_CONTROL_LIST 1
```

This PR adds the following new APIs:

```c
void vGrantAccessToTask( TaskHandle_t xTask,
                         TaskHandle_t xTaskToGrantAccess );
void vRevokeAccessToTask( TaskHandle_t xTask,
                          TaskHandle_t xTaskToRevokeAccess );

void vGrantAccessToSemaphore( TaskHandle_t xTask,
                              SemaphoreHandle_t xSemaphoreToGrantAccess );
void vRevokeAccessToSemaphore( TaskHandle_t xTask,
                               SemaphoreHandle_t xSemaphoreToRevokeAccess );

void vGrantAccessToQueue( TaskHandle_t xTask,
                          QueueHandle_t xQueueToGrantAccess );
void vRevokeAccessToQueue( TaskHandle_t xTask,
                           QueueHandle_t xQueueToRevokeAccess );

void vGrantAccessToQueueSet( TaskHandle_t xTask,
                             QueueSetHandle_t xQueueSetToGrantAccess );
void vRevokeAccessToQueueSet( TaskHandle_t xTask,
                              QueueSetHandle_t xQueueSetToRevokeAccess );

void vGrantAccessToEventGroup( TaskHandle_t xTask,
                               EventGroupHandle_t xEventGroupToGrantAccess );
void vRevokeAccessToEventGroup( TaskHandle_t xTask,
                                EventGroupHandle_t xEventGroupToRevokeAccess );

void vGrantAccessToStreamBuffer( TaskHandle_t xTask,
                                 StreamBufferHandle_t xStreamBufferToGrantAccess );
void vRevokeAccessToStreamBuffer( TaskHandle_t xTask,
                                  StreamBufferHandle_t xStreamBufferToRevokeAccess );

void vGrantAccessToMessageBuffer( TaskHandle_t xTask,
                                  MessageBufferHandle_t xMessageBufferToGrantAccess );
void vRevokeAccessToMessageBuffer( TaskHandle_t xTask,
                                   MessageBufferHandle_t xMessageBufferToRevokeAccess );

void vGrantAccessToTimer( TaskHandle_t xTask,
                          TimerHandle_t xTimerToGrantAccess );
void vRevokeAccessToTimer( TaskHandle_t xTask,
                           TimerHandle_t xTimerToRevokeAccess );
```

An unprivileged task by default has access to itself only and no other
kernel object. The application writer needs to explicitly grant an
unprivileged task access to all the kernel objects it needs. The best
place to do that is before starting the scheduler when all the kernel
objects are created. 

For example, let's say an unprivileged tasks needs access to a queue and
an event group, the application writer needs to do the following:

```c
vGrantAccessToQueue( xUnprivilegedTaskHandle, xQueue );
vGrantAccessToEventGroup( xUnprivilegedTaskHandle, xEventGroup );
```

The application writer MUST revoke all the accesses before deleting a
task. Failing to do so will result in undefined behavior. In the above
example, the application writer needs to make the following 2 calls
before deleting the task:

```c
vRevokeAccessToQueue( xUnprivilegedTaskHandle, xQueue );
vRevokeAccessToEventGroup( xUnprivilegedTaskHandle, xEventGroup );

```
This commit is contained in:
kar-rahul-aws
2023-09-18 15:34:42 +05:30
committed by GitHub
parent 7db0e87af1
commit 170a291d4d
56 changed files with 2952 additions and 219 deletions
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21
include/task.h
View File

@ -3469,6 +3469,27 @@ void vTaskExitCriticalFromISR( UBaseType_t uxSavedInterruptStatus );
#endif /* portUSING_MPU_WRAPPERS */
#if ( ( portUSING_MPU_WRAPPERS == 1 ) && ( configUSE_MPU_WRAPPERS_V1 == 0 ) && ( configENABLE_ACCESS_CONTROL_LIST == 1 ) )
/*
* For internal use only. Grant/Revoke a task's access to a kernel object.
*/
void vGrantAccessToKernelObject( TaskHandle_t xExternalTaskHandle,
int32_t lExternalKernelObjectHandle ) PRIVILEGED_FUNCTION;
void vRevokeAccessToKernelObject( TaskHandle_t xExternalTaskHandle,
int32_t lExternalKernelObjectHandle ) PRIVILEGED_FUNCTION;
/*
* For internal use only. Grant/Revoke a task's access to a kernel object.
*/
void vPortGrantAccessToKernelObject( TaskHandle_t xInternalTaskHandle,
int32_t lInternalIndexOfKernelObject ) PRIVILEGED_FUNCTION;
void vPortRevokeAccessToKernelObject( TaskHandle_t xInternalTaskHandle,
int32_t lInternalIndexOfKernelObject ) PRIVILEGED_FUNCTION;
#endif /* #if ( ( portUSING_MPU_WRAPPERS == 1 ) && ( configUSE_MPU_WRAPPERS_V1 == 0 ) && ( configENABLE_ACCESS_CONTROL_LIST == 1 ) ) */
/* *INDENT-OFF* */
#ifdef __cplusplus
}