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Lagom/Fuzzers: Recommend enabling UBSan, extend instructions

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Ben Wiederhake 2021-01-30 00:42:32 +01:00 committed by Andreas Kling
parent 1cbc01e288
commit 648f153951
1 changed files with 13 additions and 1 deletions
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14
Meta/Lagom/ReadMe.md
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@ -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/).