1873a496e2
[LibFuzzer] Declare and use sanitizer functions in ``fuzzer::ExternalFunctions``
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This fixes linking problems on OSX.
Unfortunately it turns out we need to use an instance of the
``fuzzer::ExternalFunctions`` object in several places so this
commit also replaces all instances with a single global instance.
It also turns out initializing a global ``fuzzer::ExternalFunctions``
before main is entered (i.e. letting the object be initialised by the
global initializers) is not safe (on OSX the call to ``Printf()`` in the
CTOR crashes if it is called from a global initializer) so we instead
have a global ``fuzzer::ExternalFunctions*`` and initialize it inside
``FuzzerDriver()``.
Multiple unit tests depend also depend on the
``fuzzer::ExternalFunctions*`` global so a ``main()`` function has been
added that initializes it before running any tests.
Differential Revision: http://reviews.llvm.org/D20943
llvm-svn: 272072
2016-06-07 23:32:50 +00:00
470d04400e
[libFuzzer] use __sanitizer_set_report_fd with -close_fd_mask. This allows us to keep asan reports when closing target's stderr
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llvm-svn: 271053
2016-05-27 21:46:22 +00:00
f3ab6d9e10
[libFuzzer] use fflush after every Printf
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llvm-svn: 264459
2016-03-25 20:31:26 +00:00
6278f933a8
[libFuzzer] use fdopen+vfprintf instead of fsnprintf+write
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llvm-svn: 264230
2016-03-24 00:57:32 +00:00
49e409068a
[libFuzzer] add a flag close_fd_mask so that we can silence spammy targets by closing stderr/stdout
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llvm-svn: 263831
2016-03-18 20:58:29 +00:00
c43b584c1c
[libFuzzer] read corpus dirs recursively
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llvm-svn: 263773
2016-03-18 01:36:00 +00:00
298516ffa9
[libfuzzer] speeding up corpus load
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llvm-svn: 263591
2016-03-15 21:47:21 +00:00
5c3701c621
[libFuzzer] log less when re-loading files; fix a silly bug: when running single files actually run all of them, not just the first one
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llvm-svn: 262754
2016-03-04 22:35:40 +00:00
a35f7d383f
[libFuzzer] only read MaxLen bytes from every file in the corpus to speedup loading the corpus
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llvm-svn: 261267
2016-02-18 21:49:10 +00:00
cfbcf9097d
[libFuzzer] don't timeout when loading the corpus. Be a bit more verbose when loading large corpus.
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llvm-svn: 261143
2016-02-17 19:42:34 +00:00
bfbe7fc404
[libFuzzer] allow passing 1 or more files as individual inputs
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llvm-svn: 259459
2016-02-02 03:03:47 +00:00
078e984d8d
[libFuzzer] fail if the corpus dir does not exist
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llvm-svn: 259454
2016-02-02 02:07:26 +00:00
9e48cda9bc
[libFuzzer] compute base64 in-process instead of using an external lib. Since libFuzzer should not depend on anything, just re-implement base64 encoder. PR25746
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llvm-svn: 254784
2015-12-04 22:29:39 +00:00
2a48c24d77
[libFuzzer] make libFuzzer build even with a compiler that does not have sanitizer headers
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llvm-svn: 253003
2015-11-13 01:54:40 +00:00
b91c62b1f3
[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
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llvm-svn: 250564
2015-10-16 22:41:47 +00:00
9cdea94f66
[libFuzzer] be more robust when dealing with files on disk (e.g. don't crash if a file was there but disappeared)
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llvm-svn: 247066
2015-09-08 20:36:33 +00:00
06c199ac9d
[libFuzzer] fix minor inefficiency, PR24584
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llvm-svn: 246087
2015-08-26 21:55:19 +00:00
ac25eeba76
[libFuzzer] use raw C IO to reduce the risk of a deadlock in a signal handler.
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llvm-svn: 244707
2015-08-12 00:55:09 +00:00
86e4a3e0a3
[libFuzzer] require the files and directories passed to the fuzzer to exist
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llvm-svn: 242596
2015-07-18 00:03:37 +00:00
20e9bcbfc8
[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.
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llvm-svn: 238078
2015-05-23 01:07:46 +00:00
2da7b84852
[lib/Fuzzer] when -sync_command=<CMD> is given, periodically execute 'CMD CORPUS' to synchronize with other processes
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llvm-svn: 237617
2015-05-18 21:34:20 +00:00
1ac8055bc7
[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
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llvm-svn: 236906
2015-05-08 21:30:55 +00:00
ca6a2a2f1c
[lib/Fuzzer] on crash print the contents of the crashy input as base64
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llvm-svn: 236548
2015-05-05 21:59:51 +00:00
52a788e503
[fuzzer] Add support for token-based fuzzing (e.g. for C++). Allow string flags.
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llvm-svn: 233745
2015-03-31 20:13:20 +00:00
5b266a8a23
[fuzzer] make multi-process execution more verbose; fix mutation to actually respect mutation depth and to never produce empty units
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llvm-svn: 228170
2015-02-04 19:10:20 +00:00
ef11698cac
Reverting r227452, which adds back the fuzzer library. Now excluding the fuzzer library based on LLVM_USE_SANITIZE_COVERAGE being set or unset.
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llvm-svn: 227464
2015-01-29 16:58:29 +00:00
7b54ed221a
Temporarily reverting the fuzzer library as it causes too many build issues for MSVC users. This reverts: 227445, 227395, 227389, 227357, 227254, 227252
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llvm-svn: 227452
2015-01-29 15:49:22 +00:00
265cf04f9c
[fuzzer] add option -save_minimized_corpus
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llvm-svn: 227395
2015-01-28 23:48:39 +00:00
d53b43fe11
Add a Fuzzer library
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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
Dan Liew