3a66446a9a
Fuzzing the string to integer and float functions without relying on the system libc allows for tests to be run in a wider variety of places. Reviewed By: sivachandra Differential Revision: https://reviews.llvm.org/D143616
51 lines
1.8 KiB
C++
51 lines
1.8 KiB
C++
//===-- strtofloat_fuzz.cpp -----------------------------------------------===//
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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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///
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/// Fuzzing test for llvm-libc atof implementation.
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///
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//===----------------------------------------------------------------------===//
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#include "src/stdlib/atof.h"
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#include "src/stdlib/strtod.h"
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#include "src/stdlib/strtof.h"
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#include "src/stdlib/strtold.h"
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#include <stddef.h>
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#include <stdint.h>
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
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uint8_t *container = new uint8_t[size + 1];
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if (!container)
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__builtin_trap();
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size_t i;
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for (i = 0; i < size; ++i)
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container[i] = data[i];
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container[size] = '\0'; // Add null terminator to container.
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const char *str_ptr = reinterpret_cast<const char *>(container);
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char *out_ptr = nullptr;
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// This fuzzer only checks that the alrogithms didn't read beyond the end of
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// the string in container. Combined with sanitizers, this will check that the
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// code is not reading memory beyond what's expected. This test does not make
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// any attempt to check correctness of the result.
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auto volatile atof_output = __llvm_libc::atof(str_ptr);
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auto volatile strtof_output = __llvm_libc::strtof(str_ptr, &out_ptr);
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if (str_ptr + size < out_ptr)
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__builtin_trap();
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auto volatile strtod_output = __llvm_libc::strtod(str_ptr, &out_ptr);
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if (str_ptr + size < out_ptr)
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__builtin_trap();
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auto volatile strtold_output = __llvm_libc::strtold(str_ptr, &out_ptr);
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if (str_ptr + size < out_ptr)
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__builtin_trap();
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delete[] container;
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return 0;
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}
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