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
13 using namespace llvm;
14 using namespace object;
15 using namespace bolt;
16
17 namespace opts {
18 extern cl::opt<std::string> OutputFilename;
19 extern cl::opt<bool> Lite;
20 } // namespace opts
21
LLVMFuzzerTestOneInput(const char * Data,size_t Size)22 extern "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("\177ELF", Data, 4) != 0)
30 return 0;
31 // Construct an ELF binary from fuzzer input.
32 std::unique_ptr<MemoryBuffer> Buffer =
33 MemoryBuffer::getMemBuffer(StringRef(Data, Size), "", false);
34 Expected<std::unique_ptr<Binary>> BinaryOrErr =
35 createBinary(Buffer->getMemBufferRef());
36 // Check that the input is a valid binary.
37 if (Error E = BinaryOrErr.takeError()) {
38 consumeError(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>(&Binary);
44 if (!E)
45 return 0;
46
47 // Fuzz RewriteInstance.
48 auto RIOrErr = RewriteInstance::create(E, argc, argv, "llvm-bolt");
49 if (Error E = RIOrErr.takeError()) {
50 consumeError(std::move(E));
51 return 0;
52 }
53 RewriteInstance &RI = *RIOrErr.get();
54 if (Error E = RI.run())
55 consumeError(std::move(E));
56 return 0;
57 }
58
LLVMFuzzerInitialize(int * argc,char *** argv)59 extern "C" LLVM_ATTRIBUTE_USED int LLVMFuzzerInitialize(int *argc,
60 char ***argv) {
61 llvm::InitializeAllTargetInfos();
62 llvm::InitializeAllTargetMCs();
63 llvm::InitializeAllAsmParsers();
64 llvm::InitializeAllDisassemblers();
65
66 llvm::InitializeAllTargets();
67 llvm::InitializeAllAsmPrinters();
68
69 return 0;
70 }
71