Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 204 insertions, 0 deletions

diff --git a/tools/fuzzing/nyx/Nyx.cpp b/tools/fuzzing/nyx/Nyx.cpp
new file mode 100644
index 0000000000..b17278b2ad
--- /dev/null
+++ b/tools/fuzzing/nyx/Nyx.cpp
@@ -0,0 +1,204 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/Assertions.h"
+#include "mozilla/Unused.h"
+#include "mozilla/Vector.h"
+#include "mozilla/fuzzing/Nyx.h"
+#include "prinrval.h"
+#include "prthread.h"
+
+#include <algorithm>
+#include <fstream>
+
+#include <unistd.h>
+
+namespace mozilla {
+namespace fuzzing {
+
+Nyx::Nyx() {}
+
+// static
+Nyx& Nyx::instance() {
+  static Nyx nyx;
+  return nyx;
+}
+
+extern "C" {
+MOZ_EXPORT __attribute__((weak)) void nyx_start(void);
+MOZ_EXPORT __attribute__((weak)) uint32_t nyx_get_next_fuzz_data(void*,
+                                                                 uint32_t);
+MOZ_EXPORT __attribute__((weak)) void nyx_release(uint32_t);
+MOZ_EXPORT __attribute__((weak)) void nyx_handle_event(const char*, const char*,
+                                                       int, const char*);
+MOZ_EXPORT __attribute__((weak)) void nyx_puts(const char*);
+}
+
+/*
+ * In this macro, we must avoid calling MOZ_CRASH and friends, as these
+ * calls will redirect to the Nyx event handler routines. If the library
+ * is not properly preloaded, we will crash in the process. Instead, emit
+ * a descriptive error and then force a crash that won't be redirected.
+ */
+#define NYX_CHECK_API(func)                                                    \
+  if (!func) {                                                                 \
+    fprintf(                                                                   \
+        stderr,                                                                \
+        "Error: Nyx library must be in LD_PRELOAD. Missing function \"%s\"\n", \
+        #func);                                                                \
+    MOZ_REALLY_CRASH(__LINE__);                                                \
+  }
+
+void Nyx::start(void) {
+  MOZ_RELEASE_ASSERT(!mInited);
+  mInited = true;
+
+  // Check if we are in replay mode.
+  char* testFilePtr = getenv("MOZ_FUZZ_TESTFILE");
+  if (testFilePtr) {
+    mReplayMode = true;
+
+    MOZ_FUZZING_NYX_PRINT("[Replay Mode] Reading data file...\n");
+
+    std::string testFile(testFilePtr);
+    std::ifstream is;
+    is.open(testFile, std::ios::binary);
+
+    uint64_t chksum, num_ops, num_data, op_offset, data_offset;
+
+    // If only C++ supported streaming operators on binary files...
+    is.read(reinterpret_cast<char*>(&chksum), sizeof(uint64_t));
+    is.read(reinterpret_cast<char*>(&num_ops), sizeof(uint64_t));
+    is.read(reinterpret_cast<char*>(&num_data), sizeof(uint64_t));
+    is.read(reinterpret_cast<char*>(&op_offset), sizeof(uint64_t));
+    is.read(reinterpret_cast<char*>(&data_offset), sizeof(uint64_t));
+
+    if (!is.good()) {
+      MOZ_FUZZING_NYX_PRINT("[Replay Mode] Error reading input file.\n");
+      _exit(1);
+    }
+
+    is.seekg(data_offset);
+
+    // The data chunks we receive through Nyx are stored in the data
+    // section of the testfile as chunks prefixed with a 16-bit data
+    // length. We read all chunks and store them away to simulate how
+    // we originally received the data via Nyx.
+
+    while (is.good()) {
+      uint16_t pktsize;
+      is.read(reinterpret_cast<char*>(&pktsize), sizeof(uint16_t));
+
+      if (!is.good()) {
+        break;
+      }
+
+      auto buffer = new Vector<uint8_t>();
+
+      mozilla::Unused << buffer->initLengthUninitialized(pktsize);
+      is.read(reinterpret_cast<char*>(buffer->begin()), buffer->length());
+
+      MOZ_FUZZING_NYX_PRINTF("[Replay Mode] Read data packet of size %zu\n",
+                             buffer->length());
+
+      mReplayBuffers.push_back(buffer);
+    }
+
+    if (!mReplayBuffers.size()) {
+      MOZ_FUZZING_NYX_PRINT("[Replay Mode] Error: No buffers read.\n");
+      _exit(1);
+    }
+
+    is.close();
+
+    if (!!getenv("MOZ_FUZZ_WAIT_BEFORE_REPLAY")) {
+      // This can be useful in some cases to reproduce intermittent issues.
+      PR_Sleep(PR_MillisecondsToInterval(5000));
+    }
+
+    return;
+  }
+
+  NYX_CHECK_API(nyx_start);
+  NYX_CHECK_API(nyx_get_next_fuzz_data);
+  NYX_CHECK_API(nyx_release);
+  NYX_CHECK_API(nyx_handle_event);
+  NYX_CHECK_API(nyx_puts);
+
+  nyx_start();
+}
+
+bool Nyx::started(void) { return mInited; }
+
+bool Nyx::is_enabled(const char* identifier) {
+  static char* fuzzer = getenv("NYX_FUZZER");
+  if (!fuzzer || strcmp(fuzzer, identifier)) {
+    return false;
+  }
+  return true;
+}
+
+bool Nyx::is_replay() { return mReplayMode; }
+
+uint32_t Nyx::get_data(uint8_t* data, uint32_t size) {
+  MOZ_RELEASE_ASSERT(mInited);
+
+  if (mReplayMode) {
+    if (!mReplayBuffers.size()) {
+      return 0xFFFFFFFF;
+    }
+
+    Vector<uint8_t>* buffer = mReplayBuffers.front();
+    mReplayBuffers.pop_front();
+
+    size = std::min(size, (uint32_t)buffer->length());
+    memcpy(data, buffer->begin(), size);
+
+    delete buffer;
+
+    return size;
+  }
+
+  return nyx_get_next_fuzz_data(data, size);
+}
+
+void Nyx::release(uint32_t iterations) {
+  MOZ_RELEASE_ASSERT(mInited);
+
+  if (mReplayMode) {
+    MOZ_FUZZING_NYX_PRINT("[Replay Mode] Nyx::release() called.\n");
+
+    // If we reach this point in replay mode, we are essentially done.
+    // Let's wait a bit further for things to settle and then exit.
+    PR_Sleep(PR_MillisecondsToInterval(5000));
+    _exit(1);
+  }
+
+  nyx_release(iterations);
+}
+
+void Nyx::handle_event(const char* type, const char* file, int line,
+                       const char* reason) {
+  if (mReplayMode) {
+    MOZ_FUZZING_NYX_PRINTF(
+        "[Replay Mode] Nyx::handle_event() called: %s at %s:%d : %s\n", type,
+        file, line, reason);
+    return;
+  }
+
+  if (mInited) {
+    nyx_handle_event(type, file, line, reason);
+  } else {
+    // We can have events such as MOZ_CRASH even before we snapshot.
+    // Output some useful information to make it clear where it happened.
+    MOZ_FUZZING_NYX_PRINTF(
+        "[ERROR] PRE SNAPSHOT Nyx::handle_event() called: %s at %s:%d : %s\n",
+        type, file, line, reason);
+  }
+}
+
+}  // namespace fuzzing
+}  // namespace mozilla