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notzero for afl-gcc

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This commit is contained in:
van Hauser 2019-07-03 19:10:48 +02:00
parent 00b22e37df
commit 04c92c8470
2 changed files with 12 additions and 0 deletions
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2
afl-as.h
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@ -189,6 +189,7 @@ static const u8* main_payload_32 =
" orb $1, (%edx, %edi, 1)\n"
#else
" incb (%edx, %edi, 1)\n"
" adcb $0, (%edx, %edi, 1)\n"
#endif /* ^SKIP_COUNTS */
"\n"
"__afl_return:\n"
@ -417,6 +418,7 @@ static const u8* main_payload_64 =
" orb $1, (%rdx, %rcx, 1)\n"
#else
" incb (%rdx, %rcx, 1)\n"
" adcb $0, (%rdx, %rcx, 1)\n"
#endif /* ^SKIP_COUNTS */
"\n"
"__afl_return:\n"

10
llvm_mode/afl-llvm-pass.so.cc
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@ -287,6 +287,16 @@ bool AFLCoverage::runOnModule(Module &M) {
Value *HowMuch = IRB.CreateAdd(ConstantInt::get(Int8Ty, 1), cf);
Incr = IRB.CreateAdd(Counter, HowMuch);
} else if (neverZero_counters_str[0] == '5') {
auto cf = IRB.CreateICmpEQ(Incr, ConstantInt::get(Int8Ty, 0));
auto carry = IRB.CreateZExt(cf, Int8Ty);
Incr = IRB.CreateAdd(Incr, carry);
} else if (neverZero_counters_str[0] == '6') {
auto cf = IRB.CreateICmpULT(Incr, ConstantInt::get(Int8Ty, 1));
auto carry = IRB.CreateZExt(cf, Int8Ty);
Incr = IRB.CreateAdd(Incr, carry);
// no other implementations yet
} else {
fprintf(stderr, "Error: unknown value for AFL_NZERO_COUNTS: %s (valid is 1-4)\n", neverZero_counters_str);