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Author SHA1 Message Date
Matt Morehouse ffb1132e52 [libFuzzer] Add support for Fuchsia OS. 
Summary:
This patch adds the initial support for Fuchsia.

- LIBFUZZER_FUCHSIA is added as an OS type in FuzzerDefs.h
- Fuchsia is, by design, not POSIX compliant. However, it does use ELF and
  supports common POSIX I/O functions. Thus, FuzzerExtFunctions.h and
  FuzzerIO.h are implemented by extending the header guards in
  FuzzerExtFunctionsWeak.cpp and FuzzerIOPosix.cpp to include
  LIBFUZZER_FUCHSIA.
- The platform-specific portions of FuzzerUtil.h are implemented by
  FuzzerUtilFuchsia.cpp, which makes use of exception ports, syscalls, and
  the launchpad library.
- The experimental equivalence server is not currently supported, so
  FuzzerShmem.h is implemented by stub methods in FuzzerShmemFuchsia.cpp.
  Any future implementation will likely involve VMOs.

Tested with ASAN/SanCov on Fuchsia/x86-64 with the canonical toy fuzzer.

Patch By: aarongreen

Reviewers: kcc, morehouse, flowerhack, phosek

Reviewed By: kcc, phosek, Eugene.Zelenko

Subscribers: srhines, mgorny, Eugene.Zelenko

Differential Revision: https://reviews.llvm.org/D40974

llvm-svn: 320210
 2017-12-08 22:54:44 +00:00
Kostya Serebryany cb74c65f5e libfuzzer: Fix file listing on some filesystems 
Summary:
For some filesystems, readdir will not populate dirent::d_type with valuable information. This causes libfuzzer to proceed with an empty corpus, instead of the file it contains.

This has been tested on a server using XFS.

It should fix https://bugs.llvm.org//show_bug.cgi?id=25991

Reviewers: kcc

Reviewed By: kcc

Differential Revision: https://reviews.llvm.org/D40028

llvm-svn: 318303
 2017-11-15 16:45:17 +00:00
Kostya Serebryany 4faeb87ebe [libFUzzer] change the way we load the seed corpora: instead of loading all files and these executing all files, load and execute them one-by-one. This should reduce the memory usage in many cases 
llvm-svn: 312033
 2017-08-29 20:51:24 +00:00
George Karpenkov bebcbfb46d [libFuzzer] Use custom allocators for STL containers in libFuzzer. 
Avoids ODR violations causing spurious ASAN warnings.

Differential Revision: https://reviews.llvm.org/D37086

llvm-svn: 311866
 2017-08-27 23:20:09 +00:00
George Karpenkov 24069a0424 Revert "[libFuzzer] Use custom allocators for STL containers in libFuzzer" 
This reverts commit 3539efc2f2218dba2bcbd645d0fe276f2b5cf588.

llvm-svn: 311831
 2017-08-26 17:50:35 +00:00
George Karpenkov d50410bfb1 [libFuzzer] Use custom allocators for STL containers in libFuzzer 
Avoids ODR violations causing spurious ASAN container overflow warnings.

Differential Revision: https://reviews.llvm.org/D37086

llvm-svn: 311830
 2017-08-26 17:17:37 +00:00
George Karpenkov 10ab2ace13 Move libFuzzer to compiler_rt. 
Resulting library binaries will be named libclang_rt.fuzzer*, and will
be placed in Clang toolchain, allowing redistribution.

Differential Revision: https://reviews.llvm.org/D36908

llvm-svn: 311407
 2017-08-21 23:25:50 +00:00