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https://github.com/Gericom/teak-llvm.git
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23bee0b0cf
Summary: Add basic support for emscripten. This enables libFuzzer to build (using build.sh) for emscripten and fuzz a target compiled with -fsanitize-coverage=inline-8bit-counters. Basic fuzzing and bug finding work with this commit. RSS limit and timeouts will not work because they depend on system functions that are not implemented/widely supported in emscripten. Reviewers: kcc, vitalybuka, hctim Reviewed By: hctim Subscribers: #sanitizers, llvm-commits Tags: #sanitizers, #llvm Differential Revision: https://reviews.llvm.org/D71285
55 lines
1.9 KiB
C++
55 lines
1.9 KiB
C++
//===- FuzzerExtFunctionsWeak.cpp - Interface to external functions -------===//
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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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// Implementation for Linux. This relies on the linker's support for weak
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// symbols. We don't use this approach on Apple platforms because it requires
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// clients of LibFuzzer to pass ``-U _<symbol_name>`` to the linker to allow
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// weak symbols to be undefined. That is a complication we don't want to expose
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// to clients right now.
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//===----------------------------------------------------------------------===//
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#include "FuzzerDefs.h"
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#if LIBFUZZER_LINUX || LIBFUZZER_NETBSD || LIBFUZZER_FUCHSIA || \
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LIBFUZZER_FREEBSD || LIBFUZZER_OPENBSD || LIBFUZZER_EMSCRIPTEN
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#include "FuzzerExtFunctions.h"
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#include "FuzzerIO.h"
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extern "C" {
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// Declare these symbols as weak to allow them to be optionally defined.
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#define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
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__attribute__((weak, visibility("default"))) RETURN_TYPE NAME FUNC_SIG
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#include "FuzzerExtFunctions.def"
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#undef EXT_FUNC
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}
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using namespace fuzzer;
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static void CheckFnPtr(void *FnPtr, const char *FnName, bool WarnIfMissing) {
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if (FnPtr == nullptr && WarnIfMissing) {
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Printf("WARNING: Failed to find function \"%s\".\n", FnName);
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}
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}
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namespace fuzzer {
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ExternalFunctions::ExternalFunctions() {
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#define EXT_FUNC(NAME, RETURN_TYPE, FUNC_SIG, WARN) \
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this->NAME = ::NAME; \
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CheckFnPtr(reinterpret_cast<void *>(reinterpret_cast<uintptr_t>(::NAME)), \
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#NAME, WARN);
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#include "FuzzerExtFunctions.def"
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#undef EXT_FUNC
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}
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} // namespace fuzzer
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#endif
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