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@@ -0,0 +1,67 b'' | |||
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1 | /* | |
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2 | * xdiff.cc - fuzzer harness for thirdparty/xdiff | |
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3 | * | |
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4 | * Copyright 2018, Google Inc. | |
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5 | * | |
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6 | * This software may be used and distributed according to the terms of | |
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7 | * the GNU General Public License, incorporated herein by reference. | |
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8 | */ | |
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9 | #include "thirdparty/xdiff/xdiff.h" | |
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10 | #include <inttypes.h> | |
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11 | #include <stdlib.h> | |
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12 | ||
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13 | extern "C" { | |
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14 | ||
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15 | int hunk_consumer(long a1, long a2, long b1, long b2, void *priv) | |
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16 | { | |
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17 | // TODO: probably also test returning -1 from this when things break? | |
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18 | return 0; | |
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19 | } | |
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20 | ||
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21 | int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) | |
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22 | { | |
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23 | if (!Size) { | |
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24 | return 0; | |
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25 | } | |
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26 | // figure out a random point in [0, Size] to split our input. | |
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27 | size_t split = Data[0] / 255.0 * Size; | |
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28 | ||
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29 | mmfile_t a, b; | |
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30 | ||
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31 | // `a` input to diff is data[1:split] | |
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32 | a.ptr = (char *)Data + 1; | |
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33 | // which has len split-1 | |
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34 | a.size = split - 1; | |
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35 | // `b` starts at the next byte after `a` ends | |
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36 | b.ptr = a.ptr + a.size; | |
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37 | b.size = Size - split; | |
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38 | xpparam_t xpp = { | |
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39 | XDF_INDENT_HEURISTIC, /* flags */ | |
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40 | NULL, /* anchors */ | |
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41 | 0, /* anchors_nr */ | |
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42 | }; | |
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43 | xdemitconf_t xecfg = { | |
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44 | 0, /* ctxlen */ | |
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45 | 0, /* interhunkctxlen */ | |
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46 | XDL_EMIT_BDIFFHUNK, /* flags */ | |
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47 | NULL, /* find_func */ | |
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48 | NULL, /* find_func_priv */ | |
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49 | hunk_consumer, /* hunk_consume_func */ | |
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50 | }; | |
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51 | xdemitcb_t ecb = { | |
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52 | NULL, /* priv */ | |
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53 | NULL, /* outf */ | |
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54 | }; | |
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55 | xdl_diff(&a, &b, &xpp, &xecfg, &ecb); | |
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56 | return 0; // Non-zero return values are reserved for future use. | |
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57 | } | |
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58 | ||
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59 | #ifdef HG_FUZZER_INCLUDE_MAIN | |
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60 | int main(int argc, char **argv) | |
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61 | { | |
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62 | const char data[] = "asdf"; | |
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63 | return LLVMFuzzerTestOneInput((const uint8_t *)data, 4); | |
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64 | } | |
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65 | #endif | |
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66 | ||
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67 | } // extern "C" |
@@ -13,8 +13,28 b' bdiff_fuzzer: bdiff.cc bdiff-oss-fuzz.o' | |||
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13 | 13 | $$CXX $$CXXFLAGS -std=c++11 -I../../mercurial bdiff.cc \ |
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14 | 14 | bdiff-oss-fuzz.o -lFuzzingEngine -o $$OUT/bdiff_fuzzer |
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15 | 15 | |
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16 | all: bdiff | |
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16 | x%.o: ../../mercurial/thirdparty/xdiff/x%.c ../../mercurial/thirdparty/xdiff/*.h | |
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17 | clang -g -O1 -fsanitize=fuzzer-no-link,address -c \ | |
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18 | -o $@ \ | |
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19 | $< | |
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20 | ||
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21 | xdiff: xdiff.cc xdiffi.o xemit.o xmerge.o xprepare.o xutils.o | |
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22 | clang -DHG_FUZZER_INCLUDE_MAIN=1 -g -O1 -fsanitize=fuzzer-no-link,address \ | |
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23 | -I../../mercurial xdiff.cc \ | |
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24 | xdiffi.o xemit.o xmerge.o xprepare.o xutils.o -o xdiff | |
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17 | 25 |
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18 | oss-fuzz: bdiff_fuzzer | |
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26 | fuzz-x%.o: ../../mercurial/thirdparty/xdiff/x%.c ../../mercurial/thirdparty/xdiff/*.h | |
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27 | $$CC $$CFLAGS -c \ | |
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28 | -o $@ \ | |
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29 | $< | |
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30 | ||
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31 | xdiff_fuzzer: xdiff.cc fuzz-xdiffi.o fuzz-xemit.o fuzz-xmerge.o fuzz-xprepare.o fuzz-xutils.o | |
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32 | $$CXX $$CXXFLAGS -std=c++11 -I../../mercurial xdiff.cc \ | |
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33 | fuzz-xdiffi.o fuzz-xemit.o fuzz-xmerge.o fuzz-xprepare.o fuzz-xutils.o \ | |
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34 | -lFuzzingEngine -o $$OUT/xdiff_fuzzer | |
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35 | ||
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36 | all: bdiff xdiff | |
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37 | ||
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38 | oss-fuzz: bdiff_fuzzer xdiff_fuzzer | |
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19 | 39 | |
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20 | 40 | .PHONY: all oss-fuzz |
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