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| author | Ben Wiederhake <BenWiederhake.GitHub@gmx.de> | 2021-01-30 00:42:32 +0100 |
|---|---|---|
| committer | Andreas Kling <kling@serenityos.org> | 2021-01-30 09:23:18 +0100 |
| commit | 648f15395117a6a531415008e38e64e8ca90c837 (patch) | |
| tree | 559fb13f59637e2a2f72f8c4a29736af478f1481 /Meta | |
| parent | 1cbc01e288efc1d953f4a3908a650fc346d0caeb (diff) | |
| download | serenity-648f15395117a6a531415008e38e64e8ca90c837.zip | |
Lagom/Fuzzers: Recommend enabling UBSan, extend instructions
Diffstat (limited to 'Meta')
| -rw-r--r-- | Meta/Lagom/ReadMe.md | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/Meta/Lagom/ReadMe.md b/Meta/Lagom/ReadMe.md index 4a94ff91be..82558627d4 100644 --- a/Meta/Lagom/ReadMe.md +++ b/Meta/Lagom/ReadMe.md @@ -18,7 +18,7 @@ Lagom can be used to fuzz parts of SerenityOS's code base. This requires buildli # From the root of the SerenityOS checkout: mkdir BuildLagom && cd BuildLagom - cmake -GNinja -DBUILD_LAGOM=ON -DENABLE_FUZZER_SANITIZER=ON -DENABLE_ADDRESS_SANITIZER=ON -DCMAKE_CXX_COMPILER=clang++ .. + cmake -GNinja -DBUILD_LAGOM=ON -DENABLE_FUZZER_SANITIZER=ON -DENABLE_ADDRESS_SANITIZER=ON -DENABLE_UNDEFINED_SANITIZER=ON -DCMAKE_CXX_COMPILER=clang++ .. ninja Meta/Lagom/all # Or as a handy rebuild-rerun line: ninja FuzzJs && Meta/Lagom/Fuzzers/FuzzJs @@ -110,3 +110,15 @@ __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50 50 ../sysdeps/unix/sysv/linux/raise.c: File or directory not found. (gdb) ``` + +UBSan doesn't always give useful information. use something like `export UBSAN_OPTIONS=print_stacktrace=1` to always print stacktraces. + +You may run into annoying issues with the stacktrace: + +``` +==123456==WARNING: invalid path to external symbolizer! +==123456==WARNING: Failed to use and restart external symbolizer! +``` + +That means it couldn't find the executable `llvm-symbolizer`, which could be in your OS's package `llvm`. +`llvm-symbolizer-11` will [not be recognized](https://stackoverflow.com/a/42845444/). |