129 lines
2.9 KiB
C++
129 lines
2.9 KiB
C++
// Copyright (c) 2019, Paul Dreik
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// License: see LICENSE.rst in the fmt root directory
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#include <fmt/chrono.h>
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#include <fmt/core.h>
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#include <cstdint>
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#include <stdexcept>
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#include <type_traits>
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#include <vector>
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#include "fuzzer_common.h"
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template <typename Item1>
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void invoke_fmt(const uint8_t* Data, size_t Size, unsigned int argsize) {
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constexpr auto N1 = sizeof(Item1);
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static_assert(N1 <= fmt_fuzzer::Nfixed, "Nfixed too small");
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if (Size <= fmt_fuzzer::Nfixed) {
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return;
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}
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const Item1 item1 = fmt_fuzzer::assignFromBuf<Item1>(Data);
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Data += fmt_fuzzer::Nfixed;
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Size -= fmt_fuzzer::Nfixed;
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// how many chars should be used for the argument name?
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if (argsize <= 0 || argsize >= Size) {
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return;
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}
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// allocating buffers separately is slower, but increases chances
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// of detecting memory errors
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#if FMT_FUZZ_SEPARATE_ALLOCATION
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std::vector<char> argnamebuffer(argsize + 1);
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std::memcpy(argnamebuffer.data(), Data, argsize);
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auto argname = argnamebuffer.data();
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#else
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auto argname = fmt_fuzzer::as_chars(Data);
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#endif
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Data += argsize;
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Size -= argsize;
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#if FMT_FUZZ_SEPARATE_ALLOCATION
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// allocates as tight as possible, making it easier to catch buffer overruns.
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std::vector<char> fmtstringbuffer(Size);
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std::memcpy(fmtstringbuffer.data(), Data, Size);
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auto fmtstring = fmt::string_view(fmtstringbuffer.data(), Size);
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#else
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auto fmtstring = fmt::string_view(fmt_fuzzer::as_chars(Data), Size);
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#endif
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#if FMT_FUZZ_FORMAT_TO_STRING
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std::string message = fmt::format(fmtstring, fmt::arg(argname, item1));
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#else
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fmt::memory_buffer outbuf;
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fmt::format_to(outbuf, fmtstring, fmt::arg(argname, item1));
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#endif
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}
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// for dynamic dispatching to an explicit instantiation
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template <typename Callback> void invoke(int index, Callback callback) {
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switch (index) {
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case 0:
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callback(bool{});
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break;
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case 1:
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callback(char{});
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break;
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case 2:
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using sc = signed char;
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callback(sc{});
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break;
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case 3:
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using uc = unsigned char;
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callback(uc{});
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break;
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case 4:
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callback(short{});
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break;
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case 5:
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using us = unsigned short;
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callback(us{});
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break;
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case 6:
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callback(int{});
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break;
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case 7:
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callback(unsigned{});
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break;
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case 8:
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callback(long{});
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break;
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case 9:
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using ul = unsigned long;
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callback(ul{});
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break;
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case 10:
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callback(float{});
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break;
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case 11:
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callback(double{});
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break;
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case 12:
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using LD = long double;
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callback(LD{});
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break;
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}
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}
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t* Data, size_t Size) {
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if (Size <= 3) {
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return 0;
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}
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// switch types depending on the first byte of the input
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const auto first = Data[0] & 0x0F;
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const unsigned int second = (Data[0] & 0xF0) >> 4;
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Data++;
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Size--;
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auto outerfcn = [=](auto param1) {
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invoke_fmt<decltype(param1)>(Data, Size, second);
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};
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try {
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invoke(first, outerfcn);
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} catch (std::exception& /*e*/) {
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}
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return 0;
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}
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