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Fuzzing set up and OSS-Fuzz integration #38

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15 changes: 9 additions & 6 deletions crnlib/Makefile
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
COMPILE_OPTIONS = -O3 -fomit-frame-pointer -ffast-math -fno-math-errno -g -fno-strict-aliasing -Wall -Wno-unused-value -Wno-unused -march=core2
COMPILE_OPTIONS = -O3 -fomit-frame-pointer -ffast-math -fno-math-errno -g -fno-strict-aliasing -Wall -Wno-unused-value -Wno-unused -march=core2 ${CXXFLAGS}
LINKER_OPTIONS = -lpthread -g

OBJECTS = \
Expand Down Expand Up @@ -78,19 +78,22 @@ OBJECTS = \
lzma_LzmaLib.o

all: crunch
fuzz: crunch_fuzz

%.o: %.cpp
g++ $< -o $@ -c $(COMPILE_OPTIONS)
$(CXX) $< -o $@ -c $(COMPILE_OPTIONS)

crunch.o: ../crunch/crunch.cpp
g++ $< -o $@ -c -I../inc -I../crnlib $(COMPILE_OPTIONS)
$(CXX) $< -o $@ -c -I../inc -I../crnlib $(COMPILE_OPTIONS)

corpus_gen.o: ../crunch/corpus_gen.cpp
g++ $< -o $@ -c -I../inc -I../crnlib $(COMPILE_OPTIONS)
$(CXX) $< -o $@ -c -I../inc -I../crnlib $(COMPILE_OPTIONS)

corpus_test.o: ../crunch/corpus_test.cpp
g++ $< -o $@ -c -I../inc -I../crnlib $(COMPILE_OPTIONS)
$(CXX) $< -o $@ -c -I../inc -I../crnlib $(COMPILE_OPTIONS)

crunch: $(OBJECTS) crunch.o corpus_gen.o corpus_test.o
g++ $(OBJECTS) crunch.o corpus_gen.o corpus_test.o -o crunch $(LINKER_OPTIONS)
$(CXX) $(OBJECTS) crunch.o corpus_gen.o corpus_test.o -o crunch $(LINKER_OPTIONS)

crunch_fuzz: $(OBJECTS)
$(CXX) ${CXXFLAGS} ${LIB_FUZZING_ENGINE} -I../inc -I../crnlib crunch_fuzz.cpp -o $@ $(OBJECTS)
25 changes: 25 additions & 0 deletions crnlib/crunch_fuzz.cpp
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Original file line number Diff line number Diff line change
@@ -0,0 +1,25 @@
#include <cstddef>
#include <cstdint>
#include <string>
#include "crnlib.h"
#include "dds_defs.h"

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
crn_uint32 crn_size = static_cast<crn_uint32>(size);
void *dds = crn_decompress_crn_to_dds(data, crn_size);
if (!dds) {
return 0;
}
crn_texture_desc tex_desc;

// See crnlib.h where cCRNMaxFaces and cCRNMaxLevels are defined for details
// on the library/file limits used within crunch.
crn_uint32 *images[cCRNMaxFaces * cCRNMaxLevels];
bool success = crn_decompress_dds_to_images(dds, crn_size, images, tex_desc);
crn_free_block(dds);
if (!success) {
return 0;
}
crn_free_all_images(images, tex_desc);
return 0;
}