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Insert random noops to increase security against ROP attacks (llvm)

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A pass that adds random noops to X86 binaries to introduce diversity with the goal of increasing security against most return-oriented programming attacks.

Command line options:
  -noop-insertion // Enable noop insertion.
  -noop-insertion-percentage=X // X% of assembly instructions will have a noop prepended (default: 50%, requires -noop-insertion)
  -max-noops-per-instruction=X // Randomly generate X noops per instruction. ie. roll the dice X times with probability set above (default: 1). This doesn't guarantee X noop instructions.

In addition, the following 'quick switch' in clang enables basic diversity using default settings (currently: noop insertion and schedule randomization; it is intended to be extended in the future).
  -fdiversify

This is the llvm part of the patch.
clang part: D3393

http://reviews.llvm.org/D3392
Patch by Stephen Crane (@rinon)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225908 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
JF Bastien
2015-01-14 01:07:26 +00:00
parent 7a4708e0eb
commit 21befa7761
17 changed files with 428 additions and 4 deletions
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16
include/llvm/Support/RandomNumberGenerator.h
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@ -31,8 +31,20 @@ namespace llvm {
/// module.
class RandomNumberGenerator {
public:
typedef std::mt19937_64 RNG;
typedef RNG::result_type result_type;
/// Returns a random number in the range [0, Max).
uint_fast64_t operator()();
result_type operator()();
// Must define min and max to be compatible with URNG as used by
// std::uniform_*_distribution
static LLVM_CONSTEXPR result_type min() {
return RNG::min();
}
static LLVM_CONSTEXPR result_type max() {
return RNG::max();
}
private:
/// Seeds and salts the underlying RNG engine.
@ -45,7 +57,7 @@ private:
// http://en.cppreference.com/w/cpp/numeric/random/mersenne_twister_engine
// This RNG is deterministically portable across C++11
// implementations.
std::mt19937_64 Generator;
RNG Generator;
// Noncopyable.
RandomNumberGenerator(const RandomNumberGenerator &other)