Fuzzers: Add a DNS packet fuzzer

Meta/Lagom/Fuzzers/FuzzDNSPacket.cpp

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2023, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibDNS/Packet.h>
+
+extern "C" int LLVMFuzzerTestOneInput(uint8_t const* data, size_t size)
+{
+ AK::set_debug_enabled(false);
+ auto maybe_packet = DNS::Packet::from_raw_packet({ data, size });
+ if (!maybe_packet.has_value())
+ return 0;
+
+ (void)maybe_packet.value().to_byte_buffer();
+ return 0;
+}

Meta/Lagom/Fuzzers/fuzzers.cmake

@@ -5,6 +5,7 @@ set(FUZZER_TARGETS
  Brotli
  CyrillicDecoder
  DDSLoader
+ DNSPacket
  DeflateCompression
  DeflateDecompression
  ELF
@@ -80,6 +81,7 @@ set(FUZZER_DEPENDENCIES_Brotli LibCompress)
 set(FUZZER_DEPENDENCIES_CSSParser LibWeb)
 set(FUZZER_DEPENDENCIES_CyrillicDecoder LibTextCodec)
 set(FUZZER_DEPENDENCIES_DDSLoader LibGfx)
+set(FUZZER_DEPENDENCIES_DNSPacket LibDNS)
 set(FUZZER_DEPENDENCIES_DeflateCompression LibCompress)
 set(FUZZER_DEPENDENCIES_DeflateDecompression LibCompress)
 set(FUZZER_DEPENDENCIES_ELF LibELF)

Userland/Utilities/test-fuzz.cpp

@@ -19,6 +19,7 @@
  T(CSSParser) \
  T(CyrillicDecoder) \
  T(DDSLoader) \
+ T(DNSPacket) \
  T(DeflateCompression) \
  T(DeflateDecompression) \
  T(ELF) \