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36 Commits

Author SHA1 Message Date
Kostya Serebryany
b30ba817ce [libFuzzer] add -shuffle flag 
llvm-svn: 250603
 2015-10-17 04:38:26 +00:00
Kostya Serebryany
e3d637a4af [libFuzzer] add -artifact_prefix flag 
llvm-svn: 249807
 2015-10-09 03:57:59 +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
Ivan Krasin
b941371206 [LibFuzzer] test_single_input option to run a single test case. 
-test_single_input flag specifies a file name with test data.

Review URL: http://reviews.llvm.org/D13359

Patch by Mike Aizatsky!

llvm-svn: 249096
 2015-10-01 23:23:06 +00:00
Kostya Serebryany
2d2cfbe976 [libFuzzer] better documentatio for -save_minimized_corpus=1 
llvm-svn: 247033
 2015-09-08 17:43:51 +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
3b60fc1204 [libFuzzer] adding a parser for AFL-style dictionaries + tests. 
llvm-svn: 246800
 2015-09-03 20:23:46 +00:00
Kostya Serebryany
d4b7d4667f [libFuzzer] deprecate the -tokens flag. This was a bad idea because the corpus with this flag contains encrypted inputs, not the real inputs, which complicates interoperation with other fuzzers. Instead we'll need to implement AFL dictionary support 
llvm-svn: 246734
 2015-09-02 23:27:39 +00:00
Lenny Maiorani
1850ddfeb6 Fix missing space in libfuzzer's help text. 
llvm-svn: 244800
 2015-08-12 20:00:10 +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
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
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
6903bb7921 [lib/Fuzzer] fix docs 
llvm-svn: 238236
 2015-05-26 19:32:52 +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
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
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
Kostya Serebryany
31389337e7 [lib/Fuzzer] enable -use_counters=1 by default 
llvm-svn: 237272
 2015-05-13 18:31:46 +00:00
Kostya Serebryany
354905a212 [lib/Fuzzer] guess the right number of workers if -jobs=N is given but -workers=M is not. Update the docs. 
llvm-svn: 237163
 2015-05-12 18:51:57 +00:00
Kostya Serebryany
933c6b41dd [lib/Fuzzer] remove the -dfsan=1 flag, just use -use_traces=1 (w/ or w/o dfsan) 
llvm-svn: 237083
 2015-05-12 01:58:34 +00:00
Kostya Serebryany
528387038e [lib/Fuzzer] add a trace-based mutatation logic. Same idea as with DFSan-based mutator, but instead of relying on taint tracking, try to find the data directly in the input. More (logic and comments) to go. 
llvm-svn: 237043
 2015-05-11 20:51:19 +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
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
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
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
Kostya Serebryany
bef8a9c563 [fuzzer] add -runs=N to limit the number of runs per session. Also, make sure we do some mutations w/o cross over. 
llvm-svn: 228214
 2015-02-04 22:20:09 +00:00
Kostya Serebryany
31b6858756 [fuzzer] make multi-process execution more verbose; fix mutation to actually respect mutation depth and to never produce empty units 
llvm-svn: 228170
 2015-02-04 19:10:20 +00:00
Kostya Serebryany
e1dd7778a1 [fuzzer] add flags to run fuzzer in multiple parallel processes 
llvm-svn: 227664
 2015-01-31 01:14:40 +00:00
Kostya Serebryany
9658f61dfd [fuzzer] add -use_full_coverage_set=1 which solves FullCoverageSetTest. This does not scale very well yet, but might be a good start. 
llvm-svn: 227507
 2015-01-29 23:01:07 +00:00
Aaron Ballman
ea7bb26fdf Reverting r227452, which adds back the fuzzer library. Now excluding the fuzzer library based on LLVM_USE_SANITIZE_COVERAGE being set or unset. 
llvm-svn: 227464
 2015-01-29 16:58:29 +00:00
Aaron Ballman
28eea44386 Temporarily reverting the fuzzer library as it causes too many build issues for MSVC users. This reverts: 227445, 227395, 227389, 227357, 227254, 227252 
llvm-svn: 227452
 2015-01-29 15:49:22 +00:00
Kostya Serebryany
940c7a3149 [fuzzer] add option -save_minimized_corpus 
llvm-svn: 227395
 2015-01-28 23:48:39 +00:00
Kostya Serebryany
87931c3355 Add a Fuzzer library 
Summary:
A simple genetic in-process coverage-guided fuzz testing library.

I've used this fuzzer to test clang-format
(it found 12+ bugs, thanks djasper@ for the fixes!)
and it may also help us test other parts of LLVM.
So why not keep it in the LLVM repository?

I plan to add the cmake build rules later (in a separate patch, if that's ok)
and also add a clang-format-fuzzer target.

See README.txt for details.

Test Plan: Tests will follow separately.

Reviewers: djasper, chandlerc, rnk

Reviewed By: rnk

Subscribers: majnemer, ygribov, dblaikie, llvm-commits

Differential Revision: http://reviews.llvm.org/D7184

llvm-svn: 227252
 2015-01-27 22:08:41 +00:00