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| author | MarcoFalke <falke.marco@gmail.com> | 2020-06-26 14:38:34 -0400 |
|---|---|---|
| committer | MarcoFalke <falke.marco@gmail.com> | 2020-06-26 14:38:38 -0400 |
| commit | 3bbd8225b92dbfe48e402875bee265995b3f2383 (patch) | |
| tree | ac994871dedd15417092be0cc206b8a4f5882e7f /src | |
| parent | f32f7e907a5eb73e880c567c699569081608ed7a (diff) | |
| parent | 1087807b2bc56b9c7e7a5471c83f6ecfae79b048 (diff) | |
Merge #19366: tests: Provide main(...) function in fuzzer. Allow building uninstrumented harnesses with --enable-fuzz.
1087807b2bc56b9c7e7a5471c83f6ecfae79b048 tests: Provide main(...) function in fuzzer (practicalswift)
Pull request description:
Provide `main(...)` function in fuzzer. Allow building uninstrumented harnesses with only `--enable-fuzz`.
This PR restores the behaviour to how things worked prior to #18008. #18008 worked around an macOS specific issue but did it in a way which unnecessarily affected platforms not in need of the workaround :)
Before this patch:
```
# Build uninstrumented fuzzing harness (no libFuzzer/AFL/other-fuzzer-instrumentation)
$ ./configure --enable-fuzz
$ make
CXXLD test/fuzz/span
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/Scrt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
Makefile:7244: recipe for target 'test/fuzz/span' failed
make[2]: *** [test/fuzz/span] Error 1
make[2]: *** Waiting for unfinished jobs....
$
```
After this patch:
```
# Build uninstrumented fuzzing harness (no libFuzzer/AFL/other-fuzzer-instrumentation)
$ ./configure --enable-fuzz
$ make
$ echo foo | src/test/fuzz/span
$
```
The examples above show the change in non-macOS functionality. macOS functionality is unaffected by this patch.
ACKs for top commit:
MarcoFalke:
ACK 1087807b2bc56b9c7e7a5471c83f6ecfae79b048
Tree-SHA512: 9c16ea32ffd378057c4fae9d9124636d11e3769374d340f68a1b761b9e3e3b8a33579e60425293c96b8911405d8b96ac3ed378e669ea4c47836af06892aca73d
Diffstat (limited to 'src')
| -rw-r--r-- | src/test/fuzz/fuzz.cpp | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/src/test/fuzz/fuzz.cpp b/src/test/fuzz/fuzz.cpp index 82e1d55c0b..1e1807d734 100644 --- a/src/test/fuzz/fuzz.cpp +++ b/src/test/fuzz/fuzz.cpp @@ -12,7 +12,16 @@ const std::function<void(const std::string&)> G_TEST_LOG_FUN{}; -#if defined(__AFL_COMPILER) +// Decide if main(...) should be provided: +// * AFL needs main(...) regardless of platform. +// * macOS handles __attribute__((weak)) main(...) poorly when linking +// against libFuzzer. See https://github.com/bitcoin/bitcoin/pull/18008 +// for details. +#if defined(__AFL_COMPILER) || !defined(MAC_OSX) +#define PROVIDE_MAIN_FUNCTION +#endif + +#if defined(PROVIDE_MAIN_FUNCTION) static bool read_stdin(std::vector<uint8_t>& data) { uint8_t buffer[1024]; @@ -44,9 +53,8 @@ extern "C" int LLVMFuzzerInitialize(int* argc, char*** argv) return 0; } -// Generally, the fuzzer will provide main(), except for AFL -#if defined(__AFL_COMPILER) -int main(int argc, char** argv) +#if defined(PROVIDE_MAIN_FUNCTION) +__attribute__((weak)) int main(int argc, char** argv) { initialize(); #ifdef __AFL_INIT |