[LLVMdev] ASan for Android Applications

[Greg Fitzgerald]

Evgeniy, thanks for your help.

> You need -eng build because preloading libraries into dalvik vm is not
> allowed in user builds. JellyBean includes several bugfixes in the
> dynamic loader that asan needs.

Do you have the sha1 hashes for any of those patches?  I might be able
to track down a build that includes them.


> Was there any useful output in adb logcat when your program crashed?

Yes, I've been getting some nice hints in adb logcat along the way.
When I wasn't correctly invoking the wrapper script, I got a nice
linker error and stack trace saying that
libclang_rt.asan-arm-android.so wasn't found.  After properly
preloading the ASan runtime, I see the following error message:

W/Zygote  (  144): Error reading pid from wrapped process, child may have died
W/Zygote  (  144): java.io.EOFException
W/Zygote  (  144): at libcore.io.Streams.readFully(Streams.java:83)
W/Zygote  (  144): at java.io.DataInputStream.readInt(DataInputStream.java:124)
W/Zygote  (  144): at
com.android.internal.os.ZygoteConnection.handleParentProc(ZygoteConnection.java:908)
W/Zygote  (  144): at
com.android.internal.os.ZygoteConnection.runOnce(ZygoteConnection.java:258)
W/Zygote  (  144): at
com.android.internal.os.ZygoteInit.runSelectLoopMode(ZygoteInit.java:654)
W/Zygote  (  144): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
W/Zygote  (  144): at dalvik.system.NativeStart.main(Native Method)


I don't see any information from the child process though.  Do you a
way to figure that out?

Thanks,
Greg

On Fri, Jun 21, 2013 at 2:46 AM, Evgeniy Stepanov
<eugeni.stepanov at gmail.com> wrote:
> You are citing the "Android platform workflow" section, which is about
> sanitizing components of the Android system itself.
> For NDK apps, see "Android NDK workflow" in the same document.
>
> You need -eng build because preloading libraries into dalvik vm is not
> allowed in user builds. JellyBean includes several bugfixes in the
> dynamic loader that asan needs.
>
> Was there any useful output in adb logcat when your program crashed?
>
> On Fri, Jun 21, 2013 at 4:47 AM, Greg Fitzgerald <garious at gmail.com> wrote:
>> From:
>> http://address-sanitizer.googlecode.com/svn-history/r1624/wiki/Android.wiki
>>
>>> AddressSanitizer is fully supported in AOSP starting with JellyBean release. To run
>>> applications built with ASan you'll need an -eng build of Android.
>>>
>>> To build any part of Android system with ASan, add
>>> LOCAL_ADDRESS_SANITIZER:=true to the appropriate Android.mk.
>>
>> I don't see that string 'LOCAL_ADDRESS_SANITIZER' in the latest NDK
>> (r8e).  The wiki mentions needing an "-eng" build.  Do I need that
>> "-eng" because it includs bug-fixes needed by the ASan runtime?  or
>> can I move forward with just an upgraded build system?  If so, is the
>> Makefile that processes that variable available online?  I attempted
>> to use asan by just adding "-fsanitize=address" to cflags/ldflags and
>> preloading the runtime, but my "hello-jni" app died on startup.  Are
>> there additional flags I need to remove or defines to add?
>>
>> Thanks,
>> Greg
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