Meta+LibGfx: Fuzz BMP parsing

Author: https://github.com/BenWiederhake
Commit: https://github.com/SerenityOS/serenity/commit/98bfcb4b575
Pull-request: https://github.com/SerenityOS/serenity/pull/3398
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/nico

Meta/Lagom/Fuzzers/CMakeLists.txt

@@ -1,3 +1,12 @@
+add_executable(FuzzBMP FuzzBMP.cpp)
+target_compile_options(FuzzBMP
+    PRIVATE $<$<C_COMPILER_ID:Clang>:-g -O1 -fsanitize=fuzzer>
+    )
+target_link_libraries(FuzzBMP
+    PUBLIC Lagom
+    PRIVATE $<$<C_COMPILER_ID:Clang>:-fsanitize=fuzzer>
+    )
+
 add_executable(FuzzELF FuzzELF.cpp)
 target_compile_options(FuzzELF
     PRIVATE $<$<C_COMPILER_ID:Clang>:-g -O1 -fsanitize=fuzzer>

Meta/Lagom/Fuzzers/FuzzBMP.cpp

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2020, the SerenityOS developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <LibGfx/BMPLoader.h>
+#include <stdio.h>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
+{
+    Gfx::BMPImageDecoderPlugin loader { data, size };
+    auto bitmap = loader.bitmap();
+    if (!bitmap)
+        return 1;
+    if (bitmap->width() >= 100000 || bitmap->height() >= 100000) {
+        fprintf(stderr, "Silly bitmap: %dx%d pixels?!\n", bitmap->width(), bitmap->height());
+        ASSERT_NOT_REACHED();
+    }
+    return 0;
+}