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Replace FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION with fmt-specific macro (#1650)

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Signed-off-by: Asra Ali <asraa@google.com>
This commit is contained in:
asraa
2020-04-29 12:12:43 -04:00
committed by GitHub
parent f2ed03b919
commit e2ff910675
5 changed files with 14 additions and 8 deletions
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13
test/fuzzing/README.md
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@@ -7,14 +7,19 @@ in fmt. It is a part of the continous fuzzing at
The source code is modified to make the fuzzing possible without locking up on
resource exhaustion:
```cpp
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
#ifdef FMT_FUZZ
if(spec.precision>100000) {
throw std::runtime_error("fuzz mode - avoiding large precision");
}
#endif
```
This macro is the defacto standard for making fuzzing practically possible, see
[the libFuzzer documentation](https://llvm.org/docs/LibFuzzer.html#fuzzer-friendly-build-mode).
```
This macro `FMT_FUZZ` is enabled on OSS-Fuzz builds and makes fuzzing
practically possible. It is used in fmt code to prevent resource exhaustion in
fuzzing mode.
The macro `FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION` is the
defacto standard for making fuzzing practically possible to disable certain
fuzzing-unfriendly features (for example, randomness), see [the libFuzzer
documentation](https://llvm.org/docs/LibFuzzer.html#fuzzer-friendly-build-mode).
## Running the fuzzers locally