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61 Commits

Author SHA1 Message Date
Kostya Serebryany
c171514e30 [libFuzzer] add -merge flag to merge corpora 
llvm-svn: 251168
 2015-10-24 01:16:40 +00:00
Kostya Serebryany
f03686178a [libFuzzer] remove some old code; also make __sanitizer_get_total_unique_caller_callee_pairs weak so that newer libFuzzer works with older asan 
llvm-svn: 251133
 2015-10-23 18:37:58 +00:00
Kostya Serebryany
829e28a729 [libFuzzer] use the indirect caller-callee counter as an independent search heuristic 
llvm-svn: 251078
 2015-10-22 23:55:39 +00:00
Kostya Serebryany
8c8cba5fa8 [libFuzzer] more refactoring the code that checks the coverage. NFC 
llvm-svn: 251075
 2015-10-22 22:56:45 +00:00
Kostya Serebryany
e6c24f1866 [libFuzzer] refactoring the code that checks the coverage. NFC 
llvm-svn: 251074
 2015-10-22 22:50:47 +00:00
Kostya Serebryany
99fe4b430c [libFuzzer] remove the deprecated 'tokens' feature 
llvm-svn: 251069
 2015-10-22 21:48:09 +00:00
Kostya Serebryany
b30ba817ce [libFuzzer] add -shuffle flag 
llvm-svn: 250603
 2015-10-17 04:38:26 +00:00
Kostya Serebryany
a51be6eaa4 [libFuzzer] print a stack trace on timeout 
llvm-svn: 250571
 2015-10-16 23:04:31 +00:00
Kostya Serebryany
c1fcef367b [libFuzzer] reduce the size of artifacts printed on the screen 
llvm-svn: 250565
 2015-10-16 22:47:20 +00:00
Kostya Serebryany
47e5e62e71 [libFuzzer] When -test_single_input crashes the test it is not necessary to write crash-file because input is already known to the user. Patch by Mike Aizatsky 
llvm-svn: 250564
 2015-10-16 22:41:47 +00:00
Kostya Serebryany
98ed53705f [libFuzzer] don't print large artifacts to stderr 
llvm-svn: 249808
 2015-10-09 04:03:14 +00:00
Kostya Serebryany
e3d637a4af [libFuzzer] add -artifact_prefix flag 
llvm-svn: 249807
 2015-10-09 03:57:59 +00:00
Kostya Serebryany
4487114c63 [libFuzzer] make LLVMFuzzerTestOneInput (the fuzzer target function) return int instead of void. The actual return value is not *yet* used (and expected to be 0). This change is API breaking, so the fuzzers will need to be updated. 
llvm-svn: 249214
 2015-10-02 23:34:06 +00:00
Kostya Serebryany
20a00e008b [libFuzzer] remove experimental flag and functionality 
llvm-svn: 249194
 2015-10-02 22:00:32 +00:00
Kostya Serebryany
70f0401f05 [libFuzzer] add a flag -max_total_time 
llvm-svn: 249181
 2015-10-02 20:47:55 +00:00
Kostya Serebryany
6c4e275248 [libFuzzer] perform fewer crossover operations compared to plain mutations 
llvm-svn: 247364
 2015-09-11 00:20:58 +00:00
Kostya Serebryany
28b0d0ab37 [libFuzzer] remove -iterations as redundant (there is also -num_runs) 
llvm-svn: 247030
 2015-09-08 17:30:35 +00:00
Kostya Serebryany
28a699d9b8 [libFuzzer] actually make the dictionaries work (+docs) 
llvm-svn: 246825
 2015-09-04 00:12:11 +00:00
Kostya Serebryany
9c0479fa99 [libFuzzer] honour -only_ascii=1 when reading the initial corpus. Also, remove ugly #ifdef 
llvm-svn: 246689
 2015-09-02 19:08:08 +00:00
Kostya Serebryany
a9d3e6b2dc [libFuzzer] add two flags, -tbm_depth and -tbm_width to control how the trace-based-mutations are applied 
llvm-svn: 244712
 2015-08-12 01:55:37 +00:00
Kostya Serebryany
2bdb9ad059 [libFuzzer] add colons to the stats output to avoid confusion 
llvm-svn: 244708
 2015-08-12 01:04:27 +00:00
Nick Lewycky
1bff8578d4 Fix unused variable 'X' in release builds. 
llvm-svn: 244571
 2015-08-11 05:57:10 +00:00
Kostya Serebryany
1c2b96fda9 [libFuzzer] add -only_ascii flag 
llvm-svn: 244559
 2015-08-11 01:44:42 +00:00
Kostya Serebryany
80051e17c0 [libFuzzer] add option -report_slow_units=Nsec to control when slow units are printed 
llvm-svn: 244152
 2015-08-05 21:43:48 +00:00
Kostya Serebryany
7a9f5ff70b [libFuzzer] limit the size of the inputs printed to stderr 
llvm-svn: 243795
 2015-07-31 22:07:17 +00:00
Kostya Serebryany
02e05d0662 [libFuzzer] allow users to supply their own implementation of rand 
llvm-svn: 243078
 2015-07-24 01:06:40 +00:00
Kostya Serebryany
35d1f9b1f6 [libFuzzer] dump long running units to disk 
llvm-svn: 243031
 2015-07-23 18:37:22 +00:00
Kostya Serebryany
444683ece7 [lib/Fuzzer] make assertions more informative and update comments for the user-supplied mutator 
llvm-svn: 238658
 2015-05-30 17:33:13 +00:00
Kostya Serebryany
dd85a5b4fc [lib/Fuzzer] make the fuzzing timeout 1200 seconds by default (was: infinity) 
llvm-svn: 238251
 2015-05-26 20:57:47 +00:00
Kostya Serebryany
9de53cc3c2 [lib/Fuzzer] fix build with assertions 
llvm-svn: 238235
 2015-05-26 19:29:33 +00:00
Kostya Serebryany
6fa7ac36da [lib/Fuzzer] fully get rid of std::cerr in libFuzzer 
llvm-svn: 238081
 2015-05-23 01:22:35 +00:00
Kostya Serebryany
3afd2456cd [lib/Fuzzer] remove -use_coverage_pairs=1, an experimental feature that is unlikely to ever scale 
llvm-svn: 238063
 2015-05-22 22:47:03 +00:00
Kostya Serebryany
2ee531c66a [lib/Fuzzer] extend the fuzzer interface to allow user-supplied mutators 
llvm-svn: 238059
 2015-05-22 22:35:31 +00:00
Kostya Serebryany
46c887ece3 [lib/Fuzzer] change the meaning of -timeout flag: now timeout is applied to every unit of work separately 
llvm-svn: 237735
 2015-05-19 22:12:57 +00:00
Kostya Serebryany
33a7c23155 [lib/Fuzzer] more efficient reload logic; also don't spam git too much 
llvm-svn: 237649
 2015-05-19 01:06:07 +00:00
Kostya Serebryany
a98902fdfc [lib/Fuzzer] when -sync_command=<CMD> is given, periodically execute 'CMD CORPUS' to synchronize with other processes 
llvm-svn: 237617
 2015-05-18 21:34:20 +00:00
Logan Chien
5bf41f4c70 Code cleanup: Reindent Fuzzer::MutateAndTestOne. 
llvm-svn: 237533
 2015-05-17 02:44:31 +00:00
Kostya Serebryany
a4fe522adc [lib/Fuzzer] rename FuzzerDFSan.cpp to FuzzerTraceState.cpp; update comments. NFC expected 
llvm-svn: 237050
 2015-05-11 21:16:27 +00:00
Kostya Serebryany
9387837867 [lib/Fuzzer] use -fsanitize-coverage=trace-cmp when building LLVM with LLVM_USE_SANITIZE_COVERAGE; in lib/Fuzzer try to reload the corpus to pick up new units from other processes 
llvm-svn: 236906
 2015-05-08 21:30:55 +00:00
Kostya Serebryany
037e4b3475 [lib/Fuzzer] change the way we use taint information for fuzzing. Now, we run a single unit and collect suggested mutations based on tracing+taint data, then apply the suggested mutations one by one. The previous scheme was slower and more complex. 
llvm-svn: 236772
 2015-05-07 21:02:11 +00:00
Kostya Serebryany
f4f653e078 [lib/Fuzzer] minor refactoring/simplification, NFC 
llvm-svn: 236757
 2015-05-07 18:32:29 +00:00
Kostya Serebryany
177467fad4 [lib/Fuzzer] on crash print the contents of the crashy input as base64 
llvm-svn: 236548
 2015-05-05 21:59:51 +00:00
Kostya Serebryany
c69c3a7d4e [fuzzer] Add support for token-based fuzzing (e.g. for C++). Allow string flags. 
llvm-svn: 233745
 2015-03-31 20:13:20 +00:00
Kostya Serebryany
e11d81541d [fuzzer] when a single unit takes over 1 second to run and it is the slowest one so far, print it. 
llvm-svn: 233637
 2015-03-30 23:04:35 +00:00
Kostya Serebryany
84554a2713 [fuzzer] print various stats in a unified way 
llvm-svn: 233624
 2015-03-30 22:44:03 +00:00
Kostya Serebryany
bf919ef6ab DFSan-based fuzzer (proof of concept). 
Summary:
This adds a simple DFSan-based (i.e. taint-guided) fuzzer mutator,
see the comments for details.

Test Plan: a test added

Reviewers: samsonov, pcc

Reviewed By: samsonov, pcc

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8669

llvm-svn: 233613
 2015-03-30 22:09:51 +00:00
Kostya Serebryany
285f1f0e41 [sanitizer/coverage] Add AFL-style coverage counters (search heuristic for fuzzing). 
Introduce -mllvm -sanitizer-coverage-8bit-counters=1
which adds imprecise thread-unfriendly 8-bit coverage counters.

The run-time library maps these 8-bit counters to 8-bit bitsets in the same way
AFL (http://lcamtuf.coredump.cx/afl/technical_details.txt) does:
counter values are divided into 8 ranges and based on the counter
value one of the bits in the bitset is set.
The AFL ranges are used here: 1, 2, 3, 4-7, 8-15, 16-31, 32-127, 128+.

These counters provide a search heuristic for single-threaded
coverage-guided fuzzers, we do not expect them to be useful for other purposes.

Depending on the value of -fsanitize-coverage=[123] flag,
these counters will be added to the function entry blocks (=1),
every basic block (=2), or every edge (=3).

Use these counters as an optional search heuristic in the Fuzzer library.
Add a test where this heuristic is critical.

llvm-svn: 231166
 2015-03-03 23:27:02 +00:00
Kostya Serebryany
543d4cfda0 [fuzzer] one more experimental search mode: -use_coverage_pairs=1 
llvm-svn: 229957
 2015-02-20 03:02:37 +00:00
Kostya Serebryany
af6cf1face [fuzzer] split main() into FuzzerDriver() that takes a callback as a parameter and a tiny main() in a separate file 
llvm-svn: 229882
 2015-02-19 18:45:37 +00:00
Kostya Serebryany
64c4d4b6ad [fuzzer] add flag prefer_small_during_initial_shuffle, be a bit more verbose 
llvm-svn: 228235
 2015-02-04 23:42:42 +00:00