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69 Commits

Author SHA1 Message Date
Kostya Serebryany
63da212749 [lib/Fuzzer] make assertions more informative and update comments for the user-supplied mutator 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238658 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-30 17:33:13 +00:00
Kostya Serebryany
873d4e200d [lib/Fuzzer] relax an assertion 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238608 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-29 20:31:17 +00:00
Kostya Serebryany
ea8a3963b4 [lib/Fuzzer] make the fuzzing timeout 1200 seconds by default (was: infinity) 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238251 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-26 20:57:47 +00:00
Kostya Serebryany
e4af3b4160 [lib/Fuzzer] fix docs 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238236 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-26 19:32:52 +00:00
Kostya Serebryany
f580f3683c [lib/Fuzzer] fix build with assertions 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238235 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-26 19:29:33 +00:00
Kostya Serebryany
762dbd0574 [lib/Fuzzer] doxygen-ify the comments for the user interface 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238086 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-23 02:12:05 +00:00
Kostya Serebryany
d434a0a1b2 [lib/Fuzzer] fully get rid of std::cerr in libFuzzer 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238081 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-23 01:22:35 +00:00
Kostya Serebryany
4ea4cb3197 [lib/Fuzzer] start getting rid of std::cerr. Sadly, these parts of C++ library used in libFuzzer badly interract with the same code used in the target function and also with dfsan. It's easier to just not use std::cerr than to defeat these issues. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238078 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-23 01:07:46 +00:00
Kostya Serebryany
464deacf05 [lib/Fuzzer] remove -use_coverage_pairs=1, an experimental feature that is unlikely to ever scale 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238063 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-22 22:47:03 +00:00
Kostya Serebryany
ebada2c2bc [lib/Fuzzer] extend the fuzzer interface to allow user-supplied mutators 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238059 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-22 22:35:31 +00:00
Kostya Serebryany
c9389db422 [lib/Fuzzer] ignore flags that start with --; use git pull --rebase instead of just git pull 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237950 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-21 20:39:13 +00:00
Kostya Serebryany
556425f9a9 [lib/Fuzzer] change the meaning of -timeout flag: now timeout is applied to every unit of work separately 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237735 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-19 22:12:57 +00:00
Kostya Serebryany
3b3cbed1b0 [lib/Fuzzer] more efficient reload logic; also don't spam git too much 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237649 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-19 01:06:07 +00:00
Kostya Serebryany
05ef67b6b9 [lib/Fuzzer] when -sync_command=<CMD> is given, periodically execute 'CMD CORPUS' to synchronize with other processes 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237617 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-18 21:34:20 +00:00
Logan Chien
9380329c4e Code cleanup: Reindent Fuzzer::MutateAndTestOne. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237533 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-17 02:44:31 +00:00
Kostya Serebryany
6f1b9541ba [lib/Fuzzer] Add SHA1 implementation from public domain. 
Summary:
This adds a SHA1 implementation taken from public domain code.
The change is trivial, but as it involves third-party code I'd like
a second pair of eyes before commit.

LibFuzzer can not use SHA1 from openssl because openssl may not be available
and because we may be fuzzing openssl itself.
Using sha1sum via a pipe is too slow.

Test Plan: n/a

Reviewers: chandlerc

Reviewed By: chandlerc

Subscribers: majnemer, llvm-commits

Differential Revision: http://reviews.llvm.org/D9733

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237400 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-14 22:41:49 +00:00
Kostya Serebryany
2727b58c88 [lib/Fuzzer] enable -use_counters=1 by default 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237272 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-13 18:31:46 +00:00
Kostya Serebryany
a5a1b190d8 [lib/Fuzzer] A simple script to synchronise a fuzz test corpus with an external git repository. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237208 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-12 23:19:12 +00:00
Kostya Serebryany
b8a0c0ecb3 [lib/Fuzzer] use sha1sum for the file hash 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237198 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-12 22:03:34 +00:00
Kostya Serebryany
eaba2dd2f1 [lib/Fuzzer] guess the right number of workers if -jobs=N is given but -workers=M is not. Update the docs. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237163 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-12 18:51:57 +00:00
Kostya Serebryany
de65922947 [lib/Fuzzer] remove the -dfsan=1 flag, just use -use_traces=1 (w/ or w/o dfsan) 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237083 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-12 01:58:34 +00:00
Kostya Serebryany
772410aef6 [lib/Fuzzer] detach the pulse thread instad of joining it 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237082 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-12 01:43:20 +00:00
Kostya Serebryany
66c6a4c240 [lib/Fuzzer] don't record traces when trace collection is off 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237067 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-11 23:25:28 +00:00
Kostya Serebryany
1d4481df82 [lib/Fuzzer] when running multiple fuzzing processes, print something every 10 minutes to avoid buildbot timeouts 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237054 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-11 21:31:51 +00:00
Kostya Serebryany
051ef86497 [lib/Fuzzer] rename FuzzerDFSan.cpp to FuzzerTraceState.cpp; update comments. NFC expected 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237050 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-11 21:16:27 +00:00
Kostya Serebryany
0cdb698aae [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. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237043 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-11 20:51:19 +00:00
Kostya Serebryany
5ba2a0b8b0 [lib/Fuzzer] build tests that work well with dfsan also w/o dfsan 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236909 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-08 21:45:19 +00:00
Kostya Serebryany
8ae273d380 [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 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236906 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-08 21:30:55 +00:00
Alexey Samsonov
8227e6a8b4 Update CMake flags, LibFuzzer comments and docs for new -fsanitize-coverage= flags. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236797 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-07 23:33:24 +00:00
Kostya Serebryany
6564ee8933 [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. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236772 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-07 21:02:11 +00:00
Kostya Serebryany
46fa0aabcb [lib/Fuzzer] minor refactoring/simplification, NFC 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236757 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-07 18:32:29 +00:00
Kostya Serebryany
49204878d7 [lib/Fuzzer] add dfsan_weak_hook_memcmp, enable the test that uses it, simplify the test runner 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236683 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-07 00:11:33 +00:00
Kostya Serebryany
8434a039e2 [lib/Fuzzer] remove dfsan_fuzzer_abi.list -- its contents are now moved to dfsan proper 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236659 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-06 22:47:24 +00:00
Kostya Serebryany
b350776f03 [lib/Fuzzer] add a fuzzer test for memcmp (does not work yet) 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236656 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-06 22:36:00 +00:00
Kostya Serebryany
b6ca45c39f [lib/Fuzzer] rename TestOneInput to LLVMFuzzerTestOneInput to make it more unique 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236652 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-06 22:19:00 +00:00
Kostya Serebryany
605f316258 [lib/Fuzzer] on crash print the contents of the crashy input as base64 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236548 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-05 21:59:51 +00:00
Kostya Serebryany
3784f79d64 [lib/Fuzzer] use handle_abort=1 by default so that when assert() fires we save the test case 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236476 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-05-05 01:42:55 +00:00
Aaron Ballman
1f1fecb823 Removing a spurious space; NFC. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234168 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-04-06 16:09:13 +00:00
Kostya Serebryany
01055ec7e3 [fuzzer] document the -tokens flag. Also change the diagnostic output 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233842 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-04-01 21:33:20 +00:00
Kostya Serebryany
3399e1fd73 [fuzzer] Add support for token-based fuzzing (e.g. for C++). Allow string flags. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233745 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-03-31 20:13:20 +00:00
Kostya Serebryany
3506457311 Move lib/Fuzzer docs from a README.txt to a proper .rst file. 
Summary:
Move lib/Fuzzer docs from a README.txt to a proper .rst file.
This change does not add any content, just formatting.

Test Plan: n/a

Reviewers: samsonov

Reviewed By: samsonov

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8710

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233638 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-03-30 23:05:30 +00:00
Kostya Serebryany
e6d25ad0e0 [fuzzer] when a single unit takes over 1 second to run and it is the slowest one so far, print it. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233637 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-03-30 23:04:35 +00:00
Kostya Serebryany
b0b7c53ee4 [fuzzer] print various stats in a unified way 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233624 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-03-30 22:44:03 +00:00
Kostya Serebryany
29c6bd6e4f 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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233613 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-03-30 22:09:51 +00:00
Kostya Serebryany
ae0620c4e9 [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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231166 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-03-03 23:27:02 +00:00
Kostya Serebryany
f7c1020041 [fuzzer] one more experimental search mode: -use_coverage_pairs=1 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229957 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-02-20 03:02:37 +00:00
Kostya Serebryany
ce7a848558 [fuzzer] split main() into FuzzerDriver() that takes a callback as a parameter and a tiny main() in a separate file 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229882 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-02-19 18:45:37 +00:00
Kostya Serebryany
0b1ec08b77 [fuzzer] properly annotate fallthrough, add one more entry to FAQ 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229880 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-02-19 18:21:12 +00:00
Kostya Serebryany
9b13b8c338 [fuzzer] move default sanitizer options to a separate file 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228429 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-02-06 19:52:07 +00:00
Kostya Serebryany
5d85a10810 [fuzzer] add flag prefer_small_during_initial_shuffle, be a bit more verbose 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228235 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-02-04 23:42:42 +00:00