1 files changed, 253 insertions, 0 deletions
diff --git a/llvm_mode/afl-llvm-lto-instrumentlist.so.cc b/llvm_mode/afl-llvm-lto-instrumentlist.so.cc
new file mode 100644
index 00000000..6e6199e9
--- /dev/null
+++ b/llvm_mode/afl-llvm-lto-instrumentlist.so.cc
@@ -0,0 +1,253 @@
+/*
+   american fuzzy lop++ - LLVM-mode instrumentation pass
+   ---------------------------------------------------
+
+   Written by Laszlo Szekeres <lszekeres@google.com> and
+              Michal Zalewski
+
+   LLVM integration design comes from Laszlo Szekeres. C bits copied-and-pasted
+   from afl-as.c are Michal's fault.
+
+   Copyright 2015, 2016 Google Inc. All rights reserved.
+   Copyright 2019-2020 AFLplusplus Project. All rights reserved.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at:
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+   This library is plugged into LLVM when invoking clang through afl-clang-fast.
+   It tells the compiler to add code roughly equivalent to the bits discussed
+   in ../afl-as.h.
+
+ */
+
+#define AFL_LLVM_PASS
+
+#include "config.h"
+#include "debug.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <list>
+#include <string>
+#include <fstream>
+#include <sys/time.h>
+#include <fnmatch.h>
+
+#include "llvm/IR/DebugInfo.h"
+#include "llvm/IR/BasicBlock.h"
+#include "llvm/IR/IRBuilder.h"
+#include "llvm/IR/LegacyPassManager.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Transforms/IPO/PassManagerBuilder.h"
+#include "llvm/IR/CFG.h"
+
+#include "afl-llvm-common.h"
+
+using namespace llvm;
+
+namespace {
+
+class AFLcheckIfInstrument : public ModulePass {
+
+ public:
+  static char ID;
+  AFLcheckIfInstrument() : ModulePass(ID) {
+
+    int entries = 0;
+
+    if (getenv("AFL_DEBUG")) debug = 1;
+
+    char *instrumentListFilename = getenv("AFL_LLVM_INSTRUMENT_FILE");
+    if (!instrumentListFilename)
+      instrumentListFilename = getenv("AFL_LLVM_WHITELIST");
+    if (instrumentListFilename) {
+
+      std::string   line;
+      std::ifstream fileStream;
+      fileStream.open(instrumentListFilename);
+      if (!fileStream)
+        report_fatal_error("Unable to open AFL_LLVM_INSTRUMENT_FILE");
+      getline(fileStream, line);
+      while (fileStream) {
+
+        myInstrumentList.push_back(line);
+        getline(fileStream, line);
+        entries++;
+
+      }
+
+    } else
+
+      PFATAL(
+          "afl-llvm-lto-instrumentlist.so loaded without "
+          "AFL_LLVM_INSTRUMENT_FILE?!");
+
+    if (debug)
+      SAYF(cMGN "[D] " cRST
+                "loaded the instrument file list %s with %d entries\n",
+           instrumentListFilename, entries);
+
+  }
+
+  bool runOnModule(Module &M) override;
+
+  // StringRef getPassName() const override {
+
+  //  return "American Fuzzy Lop Instrumentation";
+  // }
+
+ protected:
+  std::list<std::string> myInstrumentList;
+  int                    debug = 0;
+
+};
+
+}  // namespace
+
+char AFLcheckIfInstrument::ID = 0;
+
+bool AFLcheckIfInstrument::runOnModule(Module &M) {
+
+  /* Show a banner */
+
+  char be_quiet = 0;
+  setvbuf(stdout, NULL, _IONBF, 0);
+
+  if ((isatty(2) && !getenv("AFL_QUIET")) || getenv("AFL_DEBUG") != NULL) {
+
+    SAYF(cCYA "afl-llvm-lto-instrumentlist" VERSION cRST
+              " by Marc \"vanHauser\" Heuse <mh@mh-sec.de>\n");
+
+  } else if (getenv("AFL_QUIET"))
+
+    be_quiet = 1;
+
+  for (auto &F : M) {
+
+    if (F.size() < 1) continue;
+    // fprintf(stderr, "F:%s\n", F.getName().str().c_str());
+    if (isIgnoreFunction(&F)) continue;
+
+    BasicBlock::iterator IP = F.getEntryBlock().getFirstInsertionPt();
+    IRBuilder<>          IRB(&(*IP));
+
+    if (!myInstrumentList.empty()) {
+
+      bool instrumentFunction = false;
+
+      /* Get the current location using debug information.
+       * For now, just instrument the block if we are not able
+       * to determine our location. */
+      DebugLoc Loc = IP->getDebugLoc();
+      if (Loc) {
+
+        DILocation *cDILoc = dyn_cast<DILocation>(Loc.getAsMDNode());
+
+        unsigned int instLine = cDILoc->getLine();
+        StringRef    instFilename = cDILoc->getFilename();
+
+        if (instFilename.str().empty()) {
+
+          /* If the original location is empty, try using the inlined location
+           */
+          DILocation *oDILoc = cDILoc->getInlinedAt();
+          if (oDILoc) {
+
+            instFilename = oDILoc->getFilename();
+            instLine = oDILoc->getLine();
+
+          }
+
+        }
+
+        (void)instLine;
+
+        if (debug)
+          SAYF(cMGN "[D] " cRST "function %s is in file %s\n",
+               F.getName().str().c_str(), instFilename.str().c_str());
+        /* Continue only if we know where we actually are */
+        if (!instFilename.str().empty()) {
+
+          for (std::list<std::string>::iterator it = myInstrumentList.begin();
+               it != myInstrumentList.end(); ++it) {
+
+            /* We don't check for filename equality here because
+             * filenames might actually be full paths. Instead we
+             * check that the actual filename ends in the filename
+             * specified in the list. */
+            if (instFilename.str().length() >= it->length()) {
+
+              if (fnmatch(("*" + *it).c_str(), instFilename.str().c_str(), 0) ==
+                  0) {
+
+                instrumentFunction = true;
+                break;
+
+              }
+
+            }
+
+          }
+
+        }
+
+      }
+
+      /* Either we couldn't figure out our location or the location is
+       * not the instrument file listed, so we skip instrumentation.
+       * We do this by renaming the function. */
+      if (instrumentFunction == true) {
+
+        if (debug)
+          SAYF(cMGN "[D] " cRST "function %s is in the instrument file list\n",
+               F.getName().str().c_str());
+
+      } else {
+
+        if (debug)
+          SAYF(cMGN "[D] " cRST
+                    "function %s is NOT in the instrument file list\n",
+               F.getName().str().c_str());
+
+        auto &        Ctx = F.getContext();
+        AttributeList Attrs = F.getAttributes();
+        AttrBuilder   NewAttrs;
+        NewAttrs.addAttribute("skipinstrument");
+        F.setAttributes(
+            Attrs.addAttributes(Ctx, AttributeList::FunctionIndex, NewAttrs));
+
+      }
+
+    } else {
+
+      PFATAL("InstrumentList is empty");
+
+    }
+
+  }
+
+  return true;
+
+}
+
+static void registerAFLcheckIfInstrumentpass(const PassManagerBuilder &,
+                                             legacy::PassManagerBase &PM) {
+
+  PM.add(new AFLcheckIfInstrument());
+
+}
+
+static RegisterStandardPasses RegisterAFLcheckIfInstrumentpass(
+    PassManagerBuilder::EP_ModuleOptimizerEarly,
+    registerAFLcheckIfInstrumentpass);
+
+static RegisterStandardPasses RegisterAFLcheckIfInstrumentpass0(
+    PassManagerBuilder::EP_EnabledOnOptLevel0,
+    registerAFLcheckIfInstrumentpass);
+