NXP S32K146 with FreeRTOS

[Gideon]

Platform choose NXP S32K146HATOVLQ and OS is FreeRTOS 10.2.1

My Question was:

1) How i enable data execution prevention function in OS S (ex: NX or DEP)?

2)How i enable address space layout randomized function in OS (ex: ASLR)?

Thank u very mush!!

[giraffe508 · Accepted solution]

Thank you for your questions regarding the NXP S32K146 with FreeRTOS 10.2.1.

1) Enabling Data Execution Prevention (DEP) in FreeRTOS:

FreeRTOS does not have a built-in DEP feature like NX or DEP. However, you can implement a similar functionality using the Memory Protection Unit (MPU) available in the S32K146 microcontroller. The MPU can be used to define memory regions with specific access permissions, such as read-only, write-only, or execute-only. By configuring the MPU correctly, you can prevent code execution from data memory regions.

FreeRTOS provides an API for working with the MPU. You can find more information on how to use the MPU with FreeRTOS in the following documentation:

Using FreeRTOS with MPU on S32K144

Note that the example is for S32K144, but the same principles apply to S32K146.

2) Enabling Address Space Layout Randomization (ASLR) in FreeRTOS:

FreeRTOS does not support ASLR out of the box. Implementing ASLR in an embedded system like the S32K146 can be challenging due to the limited resources and the deterministic nature of real-time systems. However, you can implement a custom solution to randomize the memory layout of your application during the build process or at runtime.

For a build-time solution, you can use linker scripts to randomize the memory layout of your application. This will require modifying the linker script and build process to generate a different memory layout for each build. Keep in mind that this approach may not provide the same level of security as runtime ASLR.

For a runtime solution, you can implement a custom memory allocator that randomizes the memory addresses of allocated objects. This will require a deeper understanding of the FreeRTOS memory management system and may have an impact on the system's performance and determinism.

Please note that implementing ASLR in an embedded system can be complex and may not be suitable for all applications. Consider the security requirements of your specific