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27 Commits

Author SHA1 Message Date
Kostya Serebryany e9ed2327b6 [libFuzzer] change the strategy for -experimental_len_control to grow max_len slower 
llvm-svn: 320531
 2017-12-12 23:11:28 +00:00
Kostya Serebryany 2659c63e2e [libFuzzer] honor -use_counters, sligntly change the meaning of -experimental_len_control, call UpdateFeatureFrequency only if instructed by the flag 
llvm-svn: 320205
 2017-12-08 22:21:42 +00:00
Kostya Serebryany de9bafb162 [libFuzzer] add a flag -malloc_limit_mb 
llvm-svn: 319590
 2017-12-01 22:12:04 +00:00
Kostya Serebryany 6afa7a54be [libFuzzer] remove stale flags; NFC 
llvm-svn: 319572
 2017-12-01 19:24:06 +00:00
Kostya Serebryany ad05ee0512 [libFuzzer] add an experimental search heuristic flag -reduce_depth 
llvm-svn: 319571
 2017-12-01 19:18:38 +00:00
Matt Morehouse 947838c9c5 [libFuzzer] Don't add leaking inputs to corpus. 
Reviewers: kcc

Reviewed By: kcc

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D39850

llvm-svn: 317831
 2017-11-09 20:44:08 +00:00
Kostya Serebryany a2ca2dcc46 [libFuzzer] handle SIGUSR1/SIGUSR2 and try to exit grafully on these signals 
llvm-svn: 317829
 2017-11-09 20:30:19 +00:00
Vitaly Buka 7d22324b87 [fuzzer] Fix nested mallocs 
Summary: Nested mallocs are possible with internal symbolizer.

Reviewers: kcc

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D39397

llvm-svn: 317186
 2017-11-02 04:12:10 +00:00
Vitaly Buka 7dbc1d8433 [fuzzer] Fix threaded stack printing 
Reviewers: kcc

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D39397

llvm-svn: 317071
 2017-11-01 03:02:59 +00:00
Vitaly Buka df00e89cdc Revert "[fuzzer] Fix threaded stack printing and nested mallocs" 
Fails on darwin

Revert "[fuzzer] Script to detect unbalanced allocation in -trace_malloc output"
Needs previous one.

This reverts commit r317034, r317036.

llvm-svn: 317061
 2017-11-01 00:55:52 +00:00
Vitaly Buka 58da33e35c [fuzzer] Fix threaded stack printing and nested mallocs 
Summary: Nested mallocs are possible with internal symbolizer.

Reviewers: kcc

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D39397

llvm-svn: 317034
 2017-10-31 20:49:48 +00:00
Alex Shlyapnikov 5ded0701a9 [Sanitizers-libFuzzer] Addressing coding style issues. 
Summary: The result of clang-format and few manual changes (as prompted on D39155).

Reviewers: vitalybuka

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D39211

llvm-svn: 316395
 2017-10-23 23:24:33 +00:00
Alex Shlyapnikov 6f1c26f222 [libFuzzer] Periodically purge allocator's quarantine to prolong fuzzing sessions. 
Summary:
Fuzzing targets that allocate/deallocate a lot of memory tend to consume
a lot of RSS when ASan quarantine is enabled. Purging quarantine between
iterations and returning memory to OS keeps RSS down and should not
reduce the quarantine effectiveness provided the fuzz target does not
preserve state between iterations (in this case this feature can be turned off).

Based on D39153.

Reviewers: vitalybuka

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D39155

llvm-svn: 316382
 2017-10-23 22:04:30 +00:00
Kostya Serebryany 51823d3aae [libFuzzer] tweam use_feature_frequency to be less aggressive; run a dummy input before the seed corpus 
llvm-svn: 315657
 2017-10-13 01:12:23 +00:00
Kostya Serebryany 4083d54675 [libFuzzer] experimental flag to tweak the corpus distribution. Seems to improve the situation dramatically on the png benchmark and make things worse on a number of micro-puzzles. Needs more A/B testing 
llvm-svn: 315407
 2017-10-11 01:44:26 +00:00
Max Moroz 330496c3fc [libFuzzer] Disable experimental clang coverage support by default. 
Summary:
It can be enabled via "-use_clang_coverage=1" flag. Reason for disabling:
libFuzzer resets Clang Counters and makes it impossible to generate coverage
report for a regular fuzz target (i.e. not standalone build).

Reviewers: kcc

Reviewed By: kcc

Subscribers: kcc

Differential Revision: https://reviews.llvm.org/D38604

llvm-svn: 315029
 2017-10-05 22:41:03 +00:00
Kostya Serebryany 93679be037 [libFuzzer] factor out some code into GetSizedFilesFromDir; NFC 
llvm-svn: 313081
 2017-09-12 21:58:07 +00:00
Max Moroz 3f26dac416 [libfuzzer] Compare TotalNumberOfRuns with MaxNumberOfRuns when testing a memory leak. 
Summary:
Fuzzer::TryDetectingAMemoryLeak may call ExecuteCallback which would
increment TotalNumberOfRuns, but it doesn't respect Options.MaxNumberOfRuns
value specified by a user.

Context: https://github.com/google/oss-fuzz/issues/822#issuecomment-328153970

Reviewers: kcc

Reviewed By: kcc

Differential Revision: https://reviews.llvm.org/D37632

llvm-svn: 312993
 2017-09-12 02:01:54 +00:00
Kostya Serebryany 082e9a7528 [libFuzzer] tolerate missing files when loading the seed corpus 
llvm-svn: 312269
 2017-08-31 19:17:15 +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
Kostya Serebryany 3a8e3c8336 [libFuzzer] refactoring: move reading the seed corpus closer to where it's consumed; NFC 
llvm-svn: 311972
 2017-08-29 02:05:01 +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
Kostya Serebryany 2eef816e6e [libFuzzer] add -print_funcs=1 (on bey default): print newly discovered functions during fuzzing 
llvm-svn: 311797
 2017-08-25 20:09:25 +00:00
Kostya Serebryany f65cf64fa2 [libFuzzer] apply changes lost during the migration to compiler-rt 
llvm-svn: 311420
 2017-08-22 01:28:32 +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