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/*
* FreeRTOS memory safety proofs with CBMC.
* Copyright (C) 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* http://aws.amazon.com/freertos
* http://www.FreeRTOS.org
*/
#include "FreeRTOS.h"
#include "queue.h"
#include "queue_datastructure.h"
#include "cbmc.h"
#ifndef LOCK_BOUND
#define LOCK_BOUND 4
#endif
void prvUnlockQueue( Queue_t * const pxQueue );
BaseType_t prvCopyDataToQueue( Queue_t * const pxQueue,
const void * pvItemToQueue,
const BaseType_t xPosition )
{
if( pxQueue->uxItemSize > ( UBaseType_t ) 0 )
{
__CPROVER_assert( __CPROVER_r_ok( pvItemToQueue, ( size_t ) pxQueue->uxItemSize ), "pvItemToQueue region must be readable" );
if( xPosition == queueSEND_TO_BACK )
{
__CPROVER_assert( __CPROVER_w_ok( ( void * ) pxQueue->pcWriteTo, ( size_t ) pxQueue->uxItemSize ), "pxQueue->pcWriteTo region must be writable" );
}
else
{
__CPROVER_assert( __CPROVER_w_ok( ( void * ) pxQueue->u.xQueue.pcReadFrom, ( size_t ) pxQueue->uxItemSize ), "pxQueue->u.xQueue.pcReadFrom region must be writable" );
}
return pdFALSE;
}
else
{
return nondet_BaseType_t();
}
}
QueueSetHandle_t xUnconstrainedQueueSet()
{
UBaseType_t uxEventQueueLength = 2;
QueueSetHandle_t xSet = xQueueCreateSet( uxEventQueueLength );
if( xSet )
{
xSet->cTxLock = nondet_int8_t();
__CPROVER_assume( xSet->cTxLock != 127 );
xSet->cRxLock = nondet_int8_t();
xSet->uxMessagesWaiting = nondet_UBaseType_t();
xSet->xTasksWaitingToReceive.uxNumberOfItems = nondet_UBaseType_t();
/* This is an invariant checked with a couple of asserts in the code base.
* If it is false from the beginning, there is no chance for the proof to succeed*/
__CPROVER_assume( xSet->uxMessagesWaiting < xSet->uxLength );
xSet->xTasksWaitingToSend.uxNumberOfItems = nondet_UBaseType_t();
}
return xSet;
}
void harness()
{
UBaseType_t uxQueueLength;
UBaseType_t uxItemSize;
uint8_t ucQueueType;
__CPROVER_assume( uxQueueLength > 0 );
__CPROVER_assume( uxItemSize < 10 );
/* The implicit assumption for the QueueGenericCreate method is,
* that there are no overflows in the computation and the inputs are safe.
* There is no check for this in the code base */
UBaseType_t upper_bound = portMAX_DELAY - sizeof( Queue_t );
__CPROVER_assume( uxItemSize < ( upper_bound ) / uxQueueLength );
QueueHandle_t xQueue =
xQueueGenericCreate( uxQueueLength, uxItemSize, ucQueueType );
if( xQueue )
{
xQueue->cTxLock = LOCK_BOUND - 1;
xQueue->cRxLock = LOCK_BOUND - 1;
xQueue->uxMessagesWaiting = nondet_UBaseType_t();
/* This is an invariant checked with a couple of asserts in the code base.
* If it is false from the beginning, there is no chance for the proof to succeed*/
__CPROVER_assume( xQueue->uxMessagesWaiting < xQueue->uxLength );
xQueue->xTasksWaitingToReceive.uxNumberOfItems = nondet_UBaseType_t();
xQueue->xTasksWaitingToSend.uxNumberOfItems = nondet_UBaseType_t();
#if ( configUSE_QUEUE_SETS == 1 )
xQueueAddToSet( xQueue, xUnconstrainedQueueSet() );
#endif
prvUnlockQueue( xQueue );
}
}
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