e5b603a4c3
Summary:
This commit moves the `DiscardOutput` function in FuzzerIO to
FuzzerUtil, so fuchsia can have its own specialized version.
In fuchsia, accessing `/dev/null` is not supported, and there's nothing
similar to a file that discards everything that is written to it. The
way of doing something similar in fuchsia is by using `fdio_null_create`
and binding that to a file descriptor with `fdio_bind_to_fd`.
This change should fix one of the issues with the `-close_fd_mask` flag
in libfuzzer, in which closing stdout was not working due to
`fopen("/dev/null", "w")` returning `NULL`.
Reviewers: kcc, aarongreen
Subscribers: #sanitizers, llvm-commits
Tags: #sanitizers, #llvm
Differential Revision: https://reviews.llvm.org/D69593
109 lines
3.1 KiB
C++
109 lines
3.1 KiB
C++
//===- FuzzerUtil.h - Internal header for the Fuzzer Utils ------*- C++ -* ===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// Util functions.
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_FUZZER_UTIL_H
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#define LLVM_FUZZER_UTIL_H
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#include "FuzzerBuiltins.h"
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#include "FuzzerBuiltinsMsvc.h"
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#include "FuzzerCommand.h"
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#include "FuzzerDefs.h"
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namespace fuzzer {
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void PrintHexArray(const Unit &U, const char *PrintAfter = "");
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void PrintHexArray(const uint8_t *Data, size_t Size,
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const char *PrintAfter = "");
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void PrintASCII(const uint8_t *Data, size_t Size, const char *PrintAfter = "");
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void PrintASCII(const Unit &U, const char *PrintAfter = "");
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// Changes U to contain only ASCII (isprint+isspace) characters.
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// Returns true iff U has been changed.
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bool ToASCII(uint8_t *Data, size_t Size);
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bool IsASCII(const Unit &U);
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bool IsASCII(const uint8_t *Data, size_t Size);
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std::string Base64(const Unit &U);
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void PrintPC(const char *SymbolizedFMT, const char *FallbackFMT, uintptr_t PC);
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std::string DescribePC(const char *SymbolizedFMT, uintptr_t PC);
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void PrintStackTrace();
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void PrintMemoryProfile();
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unsigned NumberOfCpuCores();
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// Platform specific functions.
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void SetSignalHandler(const FuzzingOptions& Options);
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void SleepSeconds(int Seconds);
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unsigned long GetPid();
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size_t GetPeakRSSMb();
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int ExecuteCommand(const Command &Cmd);
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FILE *OpenProcessPipe(const char *Command, const char *Mode);
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const void *SearchMemory(const void *haystack, size_t haystacklen,
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const void *needle, size_t needlelen);
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std::string CloneArgsWithoutX(const Vector<std::string> &Args,
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const char *X1, const char *X2);
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inline std::string CloneArgsWithoutX(const Vector<std::string> &Args,
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const char *X) {
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return CloneArgsWithoutX(Args, X, X);
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}
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inline std::pair<std::string, std::string> SplitBefore(std::string X,
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std::string S) {
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auto Pos = S.find(X);
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if (Pos == std::string::npos)
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return std::make_pair(S, "");
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return std::make_pair(S.substr(0, Pos), S.substr(Pos));
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}
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void DiscardOutput(int Fd);
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std::string DisassembleCmd(const std::string &FileName);
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std::string SearchRegexCmd(const std::string &Regex);
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size_t SimpleFastHash(const uint8_t *Data, size_t Size);
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inline uint32_t Log(uint32_t X) { return 32 - Clz(X) - 1; }
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inline size_t PageSize() { return 4096; }
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inline uint8_t *RoundUpByPage(uint8_t *P) {
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uintptr_t X = reinterpret_cast<uintptr_t>(P);
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size_t Mask = PageSize() - 1;
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X = (X + Mask) & ~Mask;
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return reinterpret_cast<uint8_t *>(X);
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}
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inline uint8_t *RoundDownByPage(uint8_t *P) {
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uintptr_t X = reinterpret_cast<uintptr_t>(P);
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size_t Mask = PageSize() - 1;
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X = X & ~Mask;
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return reinterpret_cast<uint8_t *>(X);
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}
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} // namespace fuzzer
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#endif // LLVM_FUZZER_UTIL_H
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