Dynamorio for Android for dynamic instruction trace

[Nikhil Agrawal]

Hi everyone,
I want to use Dynamorio to get the dynamic instruction trace of Android Apps. I am using DynamoRIO-ARM-Android-EABI-8.0.0-1.tar.gz from this page.
I tried using the above tar file on my LG Nexus 5X (64 bit ARM) by executing the following command after setting the environment variable TMPDIR to /data/data/packagename and then ran the following command:

./drrun -- path/to/base.odex

I got this error message:

Target process is for the wrong architecture.

 Is this error coming because(my smartphone is 64 bit and the dynamorio is for the 32 bit?)

Now, when I executed the below two commands

./drrun -- path/to/base.apk
./drrun -- path/to/base.vdex

I got the error unable to inject: exec of | (null)

• Can someone provide their insights regarding where I am going wrong w.r.t configuring dynamorio with Android? I followed this article.
• If we will launch the same app two times (after freshly installed the same apk), then will the dynamic instruction trace be the same or different?
• Is there an equivalent tool (like instrace for Linux, Windows) available for the Android platform also? (When I executed ddrun after extracting tar file to my smartphone, it will show available tools as drmemory drmemory_light and drcov (code coverage))

If anyone in this group can help me answer my above queries, it will be a big help for my project as I really want to get the dynamic instruction trace of the Android Apps.

Thank you and Regards

Nikhil Agrawal

M.Tech(Research) Student,

Department of Computer Science and Automation,

IISc Bangalore - 560012

[Derek Bruening]

DynamoRIO-ARM-Android-EABI-8.0.0-1 is for AArch32 only.  I believe plain DR works on AArch64 Android, but client support is not yet there: https://github.com/DynamoRIO/dynamorio/issues/2154.  (Or at least private loader support is not there: maybe if you built the instrace client to not use any libraries it might run: turn off DynamoRIO_USE_LIBC.)  That issue points out the system loader and Bionic details that are missing.  Help is wanted implementing that.  It sounds like there is a lot of interest in AArch64 Android: hopefully someone will find the time to contribute.

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