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Add option to disable unprivileged critical sections

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This commit introduces a new config
configALLOW_UNPRIVILEGED_CRITICAL_SECTIONS which enables developers to
prevent critical sections from unprivileged tasks. It defaults to 1 for
backward compatibility. Application should set it to 0 to disable
critical sections from unprivileged tasks.

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>
This commit is contained in:
Gaurav Aggarwal 2021-10-06 19:00:39 -07:00 • committed by Gaurav-Aggarwal-AWS
parent 7a3848753b
commit 44fc137428
4 changed files with 92 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

25
portable/IAR/ARM_CM4F_MPU/port.c
View file

@ -63,6 +63,11 @@
#define portNVIC_SYSTICK_CLK_BIT ( 0 )
#endif
#ifndef configALLOW_UNPRIVILEGED_CRITICAL_SECTIONS
#warning "configALLOW_UNPRIVILEGED_CRITICAL_SECTIONS is not defined. We recommend defining it to 0 in FreeRTOSConfig.h for better security."
#define configALLOW_UNPRIVILEGED_CRITICAL_SECTIONS 1
#endif
/* Constants required to manipulate the core. Registers first... */
#define portNVIC_SYSTICK_CTRL_REG ( *( ( volatile uint32_t * ) 0xe000e010 ) )
#define portNVIC_SYSTICK_LOAD_REG ( *( ( volatile uint32_t * ) 0xe000e014 ) )
@ -188,12 +193,20 @@ extern void vPortRestoreContextOfFirstTask( void ) PRIVILEGED_FUNCTION;
/**
* @brief Enter critical section.
*/
void vPortEnterCritical( void ) FREERTOS_SYSTEM_CALL;
#if( configALLOW_UNPRIVILEGED_CRITICAL_SECTIONS == 1 )
void vPortEnterCritical( void ) FREERTOS_SYSTEM_CALL;
#else
void vPortEnterCritical( void ) PRIVILEGED_FUNCTION;
#endif
/**
* @brief Exit from critical section.
*/
void vPortExitCritical( void ) FREERTOS_SYSTEM_CALL;
#if( configALLOW_UNPRIVILEGED_CRITICAL_SECTIONS == 1 )
void vPortExitCritical( void ) FREERTOS_SYSTEM_CALL;
#else
void vPortExitCritical( void ) PRIVILEGED_FUNCTION;
#endif
/*-----------------------------------------------------------*/
/* Each task maintains its own interrupt status in the critical nesting
@ -444,8 +457,10 @@ void vPortEndScheduler( void )
void vPortEnterCritical( void )
{
#if( configALLOW_UNPRIVILEGED_CRITICAL_SECTIONS == 1 )
BaseType_t xRunningPrivileged;
xPortRaisePrivilege( xRunningPrivileged );
#endif
portDISABLE_INTERRUPTS();
uxCriticalNesting++;
@ -460,14 +475,18 @@ void vPortEnterCritical( void )
configASSERT( ( portNVIC_INT_CTRL_REG & portVECTACTIVE_MASK ) == 0 );
}
#if( configALLOW_UNPRIVILEGED_CRITICAL_SECTIONS == 1 )
vPortResetPrivilege( xRunningPrivileged );
#endif
}
/*-----------------------------------------------------------*/
void vPortExitCritical( void )
{
#if( configALLOW_UNPRIVILEGED_CRITICAL_SECTIONS == 1 )
BaseType_t xRunningPrivileged;
xPortRaisePrivilege( xRunningPrivileged );
#endif
configASSERT( uxCriticalNesting );
@ -478,7 +497,9 @@ void vPortExitCritical( void )
portENABLE_INTERRUPTS();
}
#if( configALLOW_UNPRIVILEGED_CRITICAL_SECTIONS == 1 )
vPortResetPrivilege( xRunningPrivileged );
#endif
}
/*-----------------------------------------------------------*/