This repo is based off the official LLVM git mirror: http://llvm.org/git/llvm.git. We have added passes which randomize the implementation details of the code to combat code-reuse attacks.
Follow the LLVM instructions from http://llvm.org/docs/GettingStarted.html#git-mirror but substitute this repo for the llvm.git repo and https://github.com/securesystemslab/multicompiler-clang for the clang.git repo.
-fdiversify - Enable diversity. This is a shortcut for -Xclang -nop-insertion
and -mllvm -sched-randomize.
-frandom-seed=S - Set the random seed to some 64-bit unsigned int S. Set this
whenever using diversity options.
-Xclang -nop-insertion - Enable the NOP insertion pass.
-mllvm -nop-insertion-percentage=X - Insert NOPs before X% of instructions (default 50%).
-mllvm -max-nops-per-instruction=X - Insert at most X NOPs each time (default 1).
-mllvm -sched-randomize - Enable schedule randomization.
-mllvm -sched-randomize-percentage=X - Randomize X% of the instruction schedule (default 50%).