Initial import unicornafl

2021-10-25 00:51:16 +02:00
parent 91451aa2f5
commit dd7476a9bd
42 changed files with 2269 additions and 1 deletions
--- a/include/afl/afl-cpu-translate-inl.h
+++ b/include/afl/afl-cpu-translate-inl.h
@ -0,0 +1,81 @@
+/*
+   american fuzzy lop++ - unicorn instrumentation
+   ----------------------------------------------
+
+   Originally written by Andrew Griffiths <agriffiths@google.com> and
+                         Michal Zalewski
+
+   Adapted for afl-unicorn by Dominik Maier <mail@dmnk.co>
+
+   CompareCoverage and NeverZero counters by Andrea Fioraldi
+                                  <andreafioraldi@gmail.com>
+
+   Copyright 2015, 2016, 2017 Google Inc. All rights reserved.
+   Copyright 2019 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 code is a shim patched into the separately-distributed source
+   code of Unicorn 1.0.1. It leverages the built-in QEMU tracing functionality
+   to implement AFL-style instrumentation and to take care of the remaining
+   parts of the AFL fork server logic.
+
+   The resulting libunicorn binary is essentially a standalone instrumentation
+   tool; for an example of how to leverage it for other purposes, you can
+   have a look at afl-showmap.c.
+
+ */
+
+#include "config.h"
+#include "types.h"
+
+/* These are executed on code generation. Execution is in afl-unicorn-tcg-runtime-inl.h */
+/* Roughly afl_gen_maybe_log -> gen_afl_maybe_log -> emit HELPER(afl_maybe_log) -> call afl_maybe_log */
+
+static void afl_gen_maybe_log(TCGContext *s, uint64_t cur_loc) {
+
+  if (!s->uc->afl_area_ptr) return;
+
+  /* "Hash" */
+
+  cur_loc = (cur_loc >> 4) ^ (cur_loc << 8);
+  cur_loc &= MAP_SIZE - 7;
+
+  /* Implement probabilistic instrumentation by looking at scrambled block
+     address. This keeps the instrumented locations stable across runs. */
+
+  if (cur_loc >= s->uc->afl_inst_rms) return;
+
+    gen_afl_maybe_log(s, cur_loc);
+
+}
+
+// Currently only arm32 and x86. We undefine it for others to silence unused func compiler warnings.
+#if defined(ARCH_HAS_COMPCOV)
+static void afl_gen_compcov(TCGContext *s, uint64_t cur_loc, TCGv arg1,
+                            TCGv arg2, TCGMemOp ot, int is_imm) {
+
+  if (!s->uc->afl_compcov_level || !s->uc->afl_area_ptr) return;
+
+  if (!is_imm && s->uc->afl_compcov_level < 2) return;
+
+  cur_loc = (cur_loc >> 4) ^ (cur_loc << 8);
+  cur_loc &= MAP_SIZE - 7;
+
+  if (cur_loc >= s->uc->afl_inst_rms) return;
+
+  switch (ot) {
+
+    case MO_64: gen_afl_compcov_log_64(s, cur_loc, (TCGv_i64)arg1, (TCGv_i64)arg2); break;
+    case MO_32: gen_afl_compcov_log_32(s, cur_loc, (TCGv_i32)arg1, (TCGv_i32)arg2); break;
+    case MO_16: gen_afl_compcov_log_16(s, cur_loc, (TCGv_i32)arg1, (TCGv_i32)arg2); break;
+    default: return;
+
+  }
+
+}
+#endif