blacklist function support for llvm_mode

TODO

@@ -2,6 +2,9 @@
 Roadmap 2.61+:
 ==============
 
+Makefile:
+ - -march=native -Ofast -flto=full
+
 afl-fuzz:
  - sync_fuzzers(): only masters sync from all, slaves only sync from master
 

docs/ChangeLog

@@ -20,7 +20,8 @@ Version ++2.60d (develop):
   - afl-fuzz:
      - now prints the real python version support compiled in
   - afl-clang-fast now shows in the help output for which llvm version it
-    was compiled for.
+    was compiled for
+  - added blacklisted function check in llvm_mode
   - added fix from Debian project to compile libdislocator and libtokencap
 
 

llvm_mode/LLVMInsTrim.so.cc

@@ -94,6 +94,28 @@ struct InsTrim : public ModulePass {
 
   }
 
+  // ripped from aflgo
+  static bool isBlacklisted(const Function *F) {
+
+    static const SmallVector<std::string, 4> Blacklist = {
+
+        "asan.",
+        "llvm.",
+        "sancov.",
+        "__ubsan_handle_",
+
+    };
+
+    for (auto const &BlacklistFunc : Blacklist) {
+
+      if (F->getName().startswith(BlacklistFunc)) { return true; }
+
+    }
+
+    return false;
+
+  }
+
   bool runOnModule(Module &M) override {
 
     char be_quiet = 0;
@@ -240,6 +262,8 @@ struct InsTrim : public ModulePass {
 
       }
 
+      if (isBlacklisted(&F)) continue;
+
       std::unordered_set<BasicBlock *> MS;
       if (!MarkSetOpt) {
 

llvm_mode/afl-clang-fast.c

@@ -444,7 +444,8 @@ int main(int argc, char** argv) {
         "You can specify custom next-stage toolchain via AFL_CC and AFL_CXX. "
         "Setting\n"
         "AFL_HARDEN enables hardening optimizations in the compiled code.\n\n"
-        "afl-clang-fast was built for llvm %s with the llvm binary path of \"%s\".\n\n",
+        "afl-clang-fast was built for llvm %s with the llvm binary path of "
+        "\"%s\".\n\n",
         BIN_PATH, BIN_PATH, LLVM_VERSION, LLVM_BINDIR);
 
     exit(1);

llvm_mode/afl-llvm-pass.so.cc

@@ -75,6 +75,28 @@ class AFLCoverage : public ModulePass {
 
   }
 
+  // ripped from aflgo
+  static bool isBlacklisted(const Function *F) {
+
+    static const SmallVector<std::string, 4> Blacklist = {
+
+        "asan.",
+        "llvm.",
+        "sancov.",
+        "__ubsan_handle_",
+
+    };
+
+    for (auto const &BlacklistFunc : Blacklist) {
+
+      if (F->getName().startswith(BlacklistFunc)) { return true; }
+
+    }
+
+    return false;
+
+  }
+
   bool runOnModule(Module &M) override;
 
   // StringRef getPassName() const override {
@@ -156,13 +178,11 @@ bool AFLCoverage::runOnModule(Module &M) {
 
   /* Instrument all the things! */
 
-  const char *IntrinsicPrefix = "llvm.";
   int inst_blocks = 0;
 
   for (auto &F : M) {
 
-    auto Fname = F.getName();
-    if (Fname.startswith(IntrinsicPrefix)) continue;
+    if (isBlacklisted(&F)) continue;
 
     for (auto &BB : F) {
 
@@ -377,6 +397,7 @@ bool AFLCoverage::runOnModule(Module &M) {
       inst_blocks++;
 
     }
+
   }
 
   /* Say something nice. */

src/afl-fuzz-stats.c

@@ -334,9 +334,9 @@ void show_stats(void) {
 
   /* Lord, forgive me this. */
 
-  SAYF(SET_G1 bSTG bLT bH bSTOP cCYA
+  SAYF(SET_G1 bSTG bLT bH bSTOP                         cCYA
        " process timing " bSTG bH30 bH5 bH bHB bH bSTOP cCYA
-       " overall results " bSTG bH2 bH2 bRT "\n");
+       " overall results " bSTG bH2 bH2                 bRT "\n");
 
   if (dumb_mode) {
 
@@ -413,9 +413,9 @@ void show_stats(void) {
                 "   uniq hangs : " cRST "%-6s" bSTG         bV "\n",
        DTD(cur_ms, last_hang_time), tmp);
 
-  SAYF(bVR bH bSTOP            cCYA
+  SAYF(bVR bH bSTOP                                          cCYA
        " cycle progress " bSTG bH10 bH5 bH2 bH2 bHB bH bSTOP cCYA
-       " map coverage " bSTG bH bHT bH20 bH2 bVL "\n");
+       " map coverage " bSTG bH bHT bH20 bH2                 bVL "\n");
 
   /* This gets funny because we want to print several variable-length variables
      together, but then cram them into a fixed-width field - so we need to
@@ -443,9 +443,9 @@ void show_stats(void) {
 
   SAYF(bSTOP " count coverage : " cRST "%-21s" bSTG bV "\n", tmp);
 
-  SAYF(bVR bH bSTOP            cCYA
+  SAYF(bVR bH bSTOP                                         cCYA
        " stage progress " bSTG bH10 bH5 bH2 bH2 bX bH bSTOP cCYA
-       " findings in depth " bSTG bH10 bH5 bH2 bH2 bVL "\n");
+       " findings in depth " bSTG bH10 bH5 bH2 bH2          bVL "\n");
 
   sprintf(tmp, "%s (%0.02f%%)", DI(queued_favored),
           ((double)queued_favored) * 100 / queued_paths);
@@ -514,7 +514,7 @@ void show_stats(void) {
 
   /* Aaaalmost there... hold on! */
 
-  SAYF(bVR bH cCYA                      bSTOP
+  SAYF(bVR bH cCYA                                                     bSTOP
        " fuzzing strategy yields " bSTG bH10 bHT bH10 bH5 bHB bH bSTOP cCYA
        " path geometry " bSTG bH5 bH2 bVL "\n");