diff options
Diffstat (limited to 'llvm_mode/afl-llvm-lto-instrumentation.so.cc')
| -rw-r--r-- | llvm_mode/afl-llvm-lto-instrumentation.so.cc | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/llvm_mode/afl-llvm-lto-instrumentation.so.cc b/llvm_mode/afl-llvm-lto-instrumentation.so.cc index 118ada52..2811d98e 100644 --- a/llvm_mode/afl-llvm-lto-instrumentation.so.cc +++ b/llvm_mode/afl-llvm-lto-instrumentation.so.cc @@ -78,6 +78,8 @@ class AFLLTOPass : public ModulePass { FATAL("AFL_LLVM_LTO_STARTID value of \"%s\" is not between 0 and %d\n", ptr, MAP_SIZE - 1); + skip_nozero = getenv("AFL_LLVM_SKIP_NEVERZERO"); + } void getAnalysisUsage(AnalysisUsage &AU) const override { @@ -111,6 +113,7 @@ class AFLLTOPass : public ModulePass { int afl_global_id = 1, debug = 0, autodictionary = 0; uint32_t be_quiet = 0, inst_blocks = 0, inst_funcs = 0, total_instr = 0; uint64_t map_addr = 0x10000; + char * skip_nozero = NULL; }; @@ -614,9 +617,14 @@ bool AFLLTOPass::runOnModule(Module &M) { Value *Incr = IRB.CreateAdd(Counter, One); - auto cf = IRB.CreateICmpEQ(Incr, Zero); - auto carry = IRB.CreateZExt(cf, Int8Ty); - Incr = IRB.CreateAdd(Incr, carry); + if (skip_nozero) { + + auto cf = IRB.CreateICmpEQ(Incr, Zero); + auto carry = IRB.CreateZExt(cf, Int8Ty); + Incr = IRB.CreateAdd(Incr, carry); + + } + IRB.CreateStore(Incr, MapPtrIdx) ->setMetadata(M.getMDKindID("nosanitize"), MDNode::get(C, None)); |