[PATCH] D124494: [lld] Add lld-fuzzer

[Alexander Shaposhnikov via Phabricator via llvm-commits]

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This diff introduces lld-fuzzer.
The command line interface is similar to other llvm fuzzer tools:

  `lld-fuzzer <libFuzzer options> -ignore_remaining_args=1 -flavor [gnu|wasm|link|ld64] <lld options>`

The last part ( `-flavor [gnu|wasm|link|ld64] <lld options>` ) is intended to emulate the existing interface of  LLD.

If no lld options are provided we use some hardcoded minimal default configurations to make the invocations like

   
  `lld-fuzzer ~/NEW_CORPUS_DIR_LLD_GNU/ -max_len=1000 -detect_leaks=0 -ignore_remaining_args=1 gnu`
  `lld-fuzzer ~/NEW_CORPUS_DIR_LLD_LD64/ -max_len=1000 -detect_leaks=0 -ignore_remaining_args=1 ld64`
  `lld-fuzzer ~/NEW_CORPUS_DIR_LLD_WASM/ -max_len=1000 -detect_leaks=0 -ignore_remaining_args=1 wasm`
  `lld-fuzzer ~/NEW_CORPUS_DIR_LLD_LINK/ -max_len=1000 -detect_leaks=0 -ignore_remaining_args=1 link`
   

do something meaningful.

Running the fuzzer (multiple times) with the empty initial corpus  has revealed a few bugs, some of them seem to be quite simple (e.g. using `assert` on user-provided data),  some others don't.
If there is any interest I can file the corresponding issues on LLVM's github.

      
     
      
      


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D124494

Files:
  lld/CMakeLists.txt
  lld/tools/fuzzer/CMakeLists.txt
  lld/tools/fuzzer/lld-fuzzer.cpp

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