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Differential D7369

fuzz: migrate xdiff fuzzer to use FuzzedDataProvider
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Authored by durin42 on Nov 11 2019, 5:02 PM.

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indygreg
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hg-reviewers
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rHG78df32a8b6f4: fuzz: migrate xdiff fuzzer to use FuzzedDataProvider

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Event Timeline

durin42 created this revision.Nov 11 2019, 5:02 PM
indygreg accepted this revision.Nov 11 2019, 10:00 PM
This revision is now accepted and ready to land.Nov 11 2019, 10:00 PM
durin42 added a commit: rHG78df32a8b6f4: fuzz: migrate xdiff fuzzer to use FuzzedDataProvider.Nov 11 2019, 10:03 PM
Closed by commit rHG78df32a8b6f4: fuzz: migrate xdiff fuzzer to use FuzzedDataProvider (authored by durin42). · Explain Why
This revision was automatically updated to reflect the committed changes.

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Mcontrib/fuzz/xdiff.cc (18 lines)

Diff 18029

contrib/fuzz/xdiff.cc

/* /*
* xdiff.cc - fuzzer harness for thirdparty/xdiff * xdiff.cc - fuzzer harness for thirdparty/xdiff
* *
* Copyright 2018, Google Inc. * Copyright 2018, Google Inc.
* *
* This software may be used and distributed according to the terms of * This software may be used and distributed according to the terms of
* the GNU General Public License, incorporated herein by reference. * the GNU General Public License, incorporated herein by reference.
*/ */
#include "thirdparty/xdiff/xdiff.h" #include "thirdparty/xdiff/xdiff.h"
#include <inttypes.h> #include <inttypes.h>
#include <stdlib.h> #include <stdlib.h>
#include "fuzzutil.h" #include <fuzzer/FuzzedDataProvider.h>
extern "C" { extern "C" {
int hunk_consumer(long a1, long a2, long b1, long b2, void *priv) int hunk_consumer(long a1, long a2, long b1, long b2, void *priv)
{ {
// TODO: probably also test returning -1 from this when things break? // TODO: probably also test returning -1 from this when things break?
return 0; return 0;
} }
int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
{ {
// Don't allow fuzzer inputs larger than 100k, since we'll just bog // Don't allow fuzzer inputs larger than 100k, since we'll just bog
// down and not accomplish much. // down and not accomplish much.
if (Size > 100000) { if (Size > 100000) {
return 0; return 0;
} }
auto maybe_inputs = SplitInputs(Data, Size); FuzzedDataProvider provider(Data, Size);
if (!maybe_inputs) { std::string left = provider.ConsumeRandomLengthString(Size);
return 0; std::string right = provider.ConsumeRemainingBytesAsString();
}
auto inputs = std::move(maybe_inputs.value());
mmfile_t a, b; mmfile_t a, b;
a.ptr = inputs.left.get(); a.ptr = (char *)left.c_str();
a.size = inputs.left_size; a.size = left.size();
b.ptr = inputs.right.get(); b.ptr = (char *)right.c_str();
b.size = inputs.right_size; b.size = right.size();
xpparam_t xpp = { xpparam_t xpp = {
XDF_INDENT_HEURISTIC, /* flags */ XDF_INDENT_HEURISTIC, /* flags */
}; };
xdemitconf_t xecfg = { xdemitconf_t xecfg = {
XDL_EMIT_BDIFFHUNK, /* flags */ XDL_EMIT_BDIFFHUNK, /* flags */
hunk_consumer, /* hunk_consume_func */ hunk_consumer, /* hunk_consume_func */
}; };
xdemitcb_t ecb = { xdemitcb_t ecb = {