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Dr. Taint

A very WIP DynamoRIO module built on the Dr. Memory Framework to implement taint analysis on ARM. Core functionality is still unfinished. Very raw, still has hardcoded paths to my hard drive in CMakeLists.txt, etc.

Limitations

Currently, taint propagation remains unimplemented for Neon and fpu instructions. glibc must be compiled without fp support. The following worked for me (cross compiled on x86):

export CC="arm-linux-gnueabi-gcc"
export AR="arm-linux-gnueabi-ar"
export RANLIB="arm-linux-gnueabi-ranlib"
export CFLAGS="-march=armv7 -mthumb -mfloat-abi=soft"
export LDFLAGS="-march=armv7 -mthumb -mfloat-abi=soft"

# in glibc directory
./configure --without-fp --host="arm-linux-gnueabi"

Now, when compiling a userland application, use the following parameters:

LDFLAGS=-march=armv7 -mfloat-abi=soft -Wl,--rpath=/path/to/new/libc.so.6 -Wl,--dynamic-linker=/path/to/new/ld-linux.so.3
CFLAGS=-march=armv7 -mfloat-abi=soft

For some reason, this doesn't get rid of all fpu/neon instructions (to my knowledge) but gets rid of almost all of them.