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| -rw-r--r-- | docs/new_project_guide.md | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/docs/new_project_guide.md b/docs/new_project_guide.md index 671e61c3..a7ce80f7 100644 --- a/docs/new_project_guide.md +++ b/docs/new_project_guide.md @@ -204,10 +204,18 @@ custom options by creating a `my_fuzzer.options` file next to a `my_fuzzer` exec ``` [libfuzzer] -max_len = 1024 +close_fd_mask = 3 +only_ascii = 1 ``` -[List of available options](http://llvm.org/docs/LibFuzzer.html#options). Use of `max_len` is highly recommended. +[List of available options](http://llvm.org/docs/LibFuzzer.html#options). Use of `max_len` is not recommended as other fuzzing engines may not support that option. Instead, if +you need to strictly enforce the input length limit, add a sanity check to the +beginning of your fuzz target: + +```cpp +if (size < kMinInputLength || size > kMaxInputLength) + return 0; +``` For out of tree [fuzz targets](glossary.md#fuzz-target), you will likely add options file using docker's `COPY` directive and will copy it into output in build script. |