Android HW-Assisted Address Sanitizer for Memory Overflow checking

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Android HW-assisted Address Sanitizer for Memory Overflow checking

    Hardware-assisted AddressSanitizer (HWASan) is a memory error detection tool.

    HWASan is based on the memory tagging approach, where a small random tag value is associated both with pointers and with ranges of memory addresses. For a memory access to be valid, the pointer and memory tags have to match.

    HWASan uses a lot less RAM compared to ASan, which makes it suitable for whole system sanitization.

Here show an example: Use HWAsan for WiFi-HAL Memory Overflow issue hunting in Android-13.0.0_2.3.0_auto BSP.

    Test environment:

        SW:   Android-13.0.0_2.3.0_auto_car2, pre-built image.

        HW:  88W9098 WiFi/BT EVK (PCIe) + i.MX8QXP EVK.

    Run 88W9098 WiFi/BT on i.MX8QXP EVK, after ~2 hours, got memory leakage.

    To locate root cause, enabled HWASan, re-build Android-13.0.0_2.3.0_auto BSP, run again, Got HWAddressSanitizer report: “heap-buffer-overflow”.

         --Reason>  "Empty or null ScanResult list"  -> 

         --Then>      "Attempt to retrieve OsuProviders with invalid scanResult List" ->

         --Result>    "heap-buffer-overflow"

      HWASan help to locate root cause of Memory Overflow issue, on WiFi AP Scan code.

      Attach file:

           "Android_HW-assisted-Address-Sanitizer_for_memory-overflow_checking.pdf"