1//===- llvm-bolt-fuzzer.cpp - Fuzzing target for llvm-bolt ----------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "bolt/Rewrite/RewriteInstance.h"
10#include "llvm/Support/CommandLine.h"
11#include "llvm/Support/TargetSelect.h"
12
13using namespace llvm;
14using namespace object;
15using namespace bolt;
16
17namespace opts {
18extern cl::opt<std::string> OutputFilename;
19extern cl::opt<bool> Lite;
20} // namespace opts
21
22extern "C" int LLVMFuzzerTestOneInput(const char *Data, size_t Size) {
23 const char *argv[] = {"llvm-bolt", nullptr};
24 const char argc = 1;
25 opts::OutputFilename = "/dev/null";
26 opts::Lite = false;
27
28 // Input has to be an ELF - we don't want to fuzz createBinary interface.
29 if (Size < 4 || strncmp(s1: "\177ELF", s2: Data, n: 4) != 0)
30 return 0;
31 // Construct an ELF binary from fuzzer input.
32 std::unique_ptr<MemoryBuffer> Buffer =
33 MemoryBuffer::getMemBuffer(InputData: StringRef(Data, Size), BufferName: "", RequiresNullTerminator: false);
34 Expected<std::unique_ptr<Binary>> BinaryOrErr =
35 createBinary(Source: Buffer->getMemBufferRef());
36 // Check that the input is a valid binary.
37 if (Error E = BinaryOrErr.takeError()) {
38 consumeError(Err: std::move(E));
39 return 0;
40 }
41 Binary &Binary = *BinaryOrErr.get();
42 // Check that the binary is an ELF64LE object file.
43 auto *E = dyn_cast<ELF64LEObjectFile>(Val: &Binary);
44 if (!E)
45 return 0;
46
47 // Fuzz RewriteInstance.
48 auto RIOrErr = RewriteInstance::create(File: E, Argc: argc, Argv: argv, ToolPath: "llvm-bolt");
49 if (Error E = RIOrErr.takeError()) {
50 consumeError(Err: std::move(E));
51 return 0;
52 }
53 RewriteInstance &RI = *RIOrErr.get();
54 if (Error E = RI.run())
55 consumeError(Err: std::move(E));
56 return 0;
57}
58
59extern "C" LLVM_ATTRIBUTE_USED int LLVMFuzzerInitialize(int *argc,
60 char ***argv) {
61 // Initialize targets and assembly printers/parsers.
62#define BOLT_TARGET(target) \
63 LLVMInitialize##target##TargetInfo(); \
64 LLVMInitialize##target##TargetMC(); \
65 LLVMInitialize##target##AsmParser(); \
66 LLVMInitialize##target##Disassembler(); \
67 LLVMInitialize##target##Target(); \
68 LLVMInitialize##target##AsmPrinter();
69
70#include "bolt/Core/TargetConfig.def"
71
72 return 0;
73}
74

source code of bolt/tools/llvm-bolt-fuzzer/llvm-bolt-fuzzer.cpp