Zachary Turner
6fa57ad9bd
Resubmit "[LibFuzzer] Split FuzzerUtil for Posix and Windows."
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This resubmits r288529, which was resubmitted because it broke a
fuzzer bot. According to kcc@ the test that broke was flakey
and it is unlikely to be a result of this patch.
llvm-svn: 288549
2016-12-02 23:02:01 +00:00
Zachary Turner
3cfeab7059
Revert "[LibFuzzer] Split FuzzerUtil for Posix and Windows."
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This reverts commit r288529, as it seems to introduce some
problems on the Linux bots.
llvm-svn: 288533
2016-12-02 20:54:56 +00:00
Zachary Turner
34dcfb9294
[LibFuzzer] Split FuzzerUtil for Posix and Windows.
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Pave the way for separating out platform specific
utility functions into separate files.
Patch by Marcos Pividori
Differential Revision: https://reviews.llvm.org/D27234
llvm-svn: 288529
2016-12-02 19:38:19 +00:00
Zachary Turner
24a148b1d4
[LibFuzzer] Split up some functions among different headers.
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In an effort to get libfuzzer working on Windows, we need to make
a distinction between what functions require platform specific
code (e.g. different code on Windows vs Linux) and what code
doesn't. IO functions, for example, tend to be platform
specific.
This patch separates out some of the functions which will need
to have platform specific implementations into different headers,
so that we can then provide different implementations for each
platform.
Aside from that, this patch contains no functional change. It
is purely a re-organization.
Patch by Marcos Pividori
Differential Revision: https://reviews.llvm.org/D27230
llvm-svn: 288264
2016-11-30 19:06:14 +00:00
Kostya Serebryany
a5f94fb6c9
[libFuzzer] add -trace_cmp=1 (guiding mutations based on the observed CMP instructions). This is a reincarnation of the previously deleted -use_traces, but using a different approach for collecting traces. Still a toy, but at least it scales well. Also fix -merge in trace-pc-guard mode
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llvm-svn: 284273
2016-10-14 20:20:33 +00:00
Kostya Serebryany
379359c53a
[libFuzzer] add ShrinkValueProfileTest, move code around, NFC
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llvm-svn: 283286
2016-10-05 01:09:40 +00:00
Kostya Serebryany
4820cc988f
[libFuzzer] remove dfsan support and some related stale code. This is not being used and as is is pretty weak anyway
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llvm-svn: 283187
2016-10-04 06:08:46 +00:00
Kostya Serebryany
ab73c6924f
[libFuzzer] move value profiling logic into TracePC
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llvm-svn: 282219
2016-09-23 00:46:18 +00:00
Kostya Serebryany
d28099de5d
[libFuzzer] change ValueBitMap to remember the number of bits in it
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llvm-svn: 282216
2016-09-23 00:22:46 +00:00
Kostya Serebryany
6f5a804cdb
[libFuzzer] refactoring: split the large header into many; NFC
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llvm-svn: 282044
2016-09-21 01:50:50 +00:00
Kostya Serebryany
5c04bd250e
[libFuzzer] remove use_traces=1 since use_value_profile seems to be strictly better
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llvm-svn: 281007
2016-09-09 01:17:03 +00:00
Kostya Serebryany
248d11519a
[libFuzzer] stop using bits for memcmp's value profile -- seems to blow up the corpus too much
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llvm-svn: 280096
2016-08-30 14:39:33 +00:00
Kostya Serebryany
d4492f8101
[libFuzzer] use bits instead of bytes for memcmp/strcmp value profile -- the fuzzer reaches the goal much faster, at least on the simple puzzles
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llvm-svn: 280054
2016-08-30 03:05:50 +00:00
Kostya Serebryany
4d22e4fcb9
[libFuzzer] use trace-div and trace-gep for guided fuzzing, add tests
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llvm-svn: 280046
2016-08-30 01:30:14 +00:00
Kostya Serebryany
bceadcf1cd
[libFuzzer] use __attribute__((target("popcnt"))) only on x86_64
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llvm-svn: 279601
2016-08-24 01:38:42 +00:00
Kostya Serebryany
ac524cfcce
[libFuzzer] collect 64 states for value profile, not 65
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llvm-svn: 279588
2016-08-23 23:37:37 +00:00
Kostya Serebryany
524c3f32e7
[sanitizer-coverage/libFuzzer] instrument comparisons with __sanitizer_cov_trace_cmp[1248] instead of __sanitizer_cov_trace_cmp, don't pass the comparison type to save a bit performance. Use these new callbacks in libFuzzer
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llvm-svn: 279027
2016-08-18 01:25:28 +00:00
Kostya Serebryany
5a5d5548f0
[libFuzzer] force proper popcnt instruction
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llvm-svn: 279002
2016-08-17 23:09:57 +00:00
Kostya Serebryany
d46a59fac4
[libFuzzer] new experimental feature: value profiling. Profiles values that affect control flow and treats new values as new coverage.
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llvm-svn: 278839
2016-08-16 19:33:51 +00:00
Kostya Serebryany
6b08be9279
[libFuzzer] properly intercept memmem
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llvm-svn: 276006
2016-07-19 18:29:06 +00:00
Kostya Serebryany
c135b55ae0
[libFuzzer] add hooks for strstr, strcasestr, strcasecmp, strncasecmp
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llvm-svn: 275648
2016-07-15 23:27:19 +00:00
Mike Aizatsky
f0b3e85f4e
[libfuzzer] moving is_ascii handler inside mutation dispatcher.
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Summary: It also fixes a bug, when first random might not be ascii.
Differential Revision: http://reviews.llvm.org/D21573
llvm-svn: 273611
2016-06-23 20:44:48 +00:00
Richard Smith
b62e7e31f7
Fix compilation with GCC, which treats this as a constructor name not a type
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name. (GCC is correct here per the latest language DRs.)
llvm-svn: 271044
2016-05-27 21:05:35 +00:00
Kostya Serebryany
f26017baf9
[libFuzzer] refactor: hide CurrentUnitData inside an interface function. NFC
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llvm-svn: 270922
2016-05-26 21:32:30 +00:00
Kostya Serebryany
f1f3f93c9e
[libFuzzer] reimplement the way we do -only_ascii to allow more 'const' in function declarations. Add a test for -only_ascii. NFC intended
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llvm-svn: 270900
2016-05-26 20:03:02 +00:00
Kostya Serebryany
64d24578d8
[libFuzzer] try to use max_len based on the items of the corpus instead of blindly defaulting to 64 bytes.
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llvm-svn: 263323
2016-03-12 01:57:04 +00:00
Dmitry Vyukov
2eed1218e5
libfuzzer: fix compiler warnings
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- unused sigaction/setitimer result (used in assert)
- unchecked fscanf return value
- signed/unsigned comparison
llvm-svn: 262472
2016-03-02 09:54:40 +00:00
Kostya Serebryany
7ec0c56e07
[libFuzzer] get rid of UserSuppliedFuzzer; NFC
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llvm-svn: 260798
2016-02-13 03:25:16 +00:00
Kostya Serebryany
d88d1305c4
[libFuzzer] don't create too many trace-based mutations as it may be too slow
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llvm-svn: 259600
2016-02-02 23:17:45 +00:00
Kostya Serebryany
b5e984992a
[libFuzzer] don't do expensive memmem if the result will not be used
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llvm-svn: 258462
2016-01-22 01:04:58 +00:00
Kostya Serebryany
476f0ce31a
[libFuzzer] replace vector with a simpler data structure in the Dictionaries to avoid memory allocations on hot path
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llvm-svn: 257985
2016-01-16 03:53:32 +00:00
Kostya Serebryany
ae5b9567bc
[libFuzzer] do mutations based on memcmp/strcmp interceptors under a separate flag (-use_memcmp, default=1)
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llvm-svn: 257873
2016-01-15 06:24:05 +00:00
Kostya Serebryany
98abb2c90a
[libFuzzer] make CurrentUnit a POD object instead of vector to avoid extra allocations
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llvm-svn: 257713
2016-01-13 23:46:01 +00:00
Kostya Serebryany
d50a3eedb4
[libFuzzer] make sure we find buffer overflow in the input buffer. Previously, re-using the same vector object was hiding buffer overflows (unless we used annotated vector)
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llvm-svn: 257701
2016-01-13 23:02:30 +00:00
Kostya Serebryany
4b83a4f6fe
[libFuzzer] add a macro LLVM_FUZZER_DEFINES_SANITIZER_WEAK_HOOOKS
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llvm-svn: 257482
2016-01-12 16:50:18 +00:00
Kostya Serebryany
4174005622
[libFuzzer] when a new unit is discovered using a dictionary, print all used dictionary entries
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llvm-svn: 257435
2016-01-12 02:36:59 +00:00
Kostya Serebryany
859e86d962
[libFuzzer] add various debug prints. Also don't mutate based on a cmp trace like (a eq a) or (a neq a)
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llvm-svn: 257434
2016-01-12 02:08:37 +00:00
Kostya Serebryany
e3580956ea
[libFuzzer] extend the weak memcmp/strcmp/strncmp interceptors to receive the result of the computations. With that, don't do any mutations if memcmp/etc returned 0
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llvm-svn: 257423
2016-01-12 00:43:42 +00:00
Kostya Serebryany
1f9c40db1d
[libFuzzer] debug prints in tracing
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llvm-svn: 257249
2016-01-09 03:46:08 +00:00
Kostya Serebryany
b65805a939
[libFuzzer] change the way trace-based mutations are applied. Instead of a custom code just rely on the automatically created dictionary
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llvm-svn: 257248
2016-01-09 03:08:58 +00:00
Kostya Serebryany
c573316eee
[libFuzzer] don't limit memcmp tracing with 8 bytes
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llvm-svn: 257245
2016-01-09 01:39:55 +00:00
Kostya Serebryany
e7583d21e3
[libFuzzer] refactor the way we collect cmp traces (don't use std::vector, don't limit with 8 bytes)
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llvm-svn: 257239
2016-01-09 00:38:40 +00:00
Kostya Serebryany
226b734d73
[libFuzzer] make trace-based fuzzing not crash in presence of threads
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llvm-svn: 256876
2016-01-06 00:03:35 +00:00
Kostya Serebryany
4d62322213
[libFuzzer] remove default initializer as a workaround for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68399 . Don't need it anyway.
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llvm-svn: 253419
2015-11-18 01:08:30 +00:00
Kostya Serebryany
3287d7a6ed
[libFuzzer] Marking exported symbols as visible. Patch by Mike Aizatsky
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llvm-svn: 248954
2015-09-30 22:22:37 +00:00
Kostya Serebryany
65f50868e5
[libFuzzer] refactor the code to allow building libFuzzer on platforms that don't have dfsan and don't support weak functions
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llvm-svn: 247321
2015-09-10 18:48:38 +00:00
Kostya Serebryany
4b82de2e47
[libFuzzer] remove a piece of stale code
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llvm-svn: 247067
2015-09-08 20:40:10 +00:00
Kostya Serebryany
e641dd6479
[libFuzzer] more accurate logic for traces, 80-char fix
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llvm-svn: 246888
2015-09-04 22:32:25 +00:00
Kostya Serebryany
12c7837381
[libFuzzer] add two flags, -tbm_depth and -tbm_width to control how the trace-based-mutations are applied
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llvm-svn: 244712
2015-08-12 01:55:37 +00:00
Kostya Serebryany
d46369d8b3
[libFuzzer] avoid build warnings in non-assert build (useful warning in this case)
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llvm-svn: 244177
2015-08-05 23:44:42 +00:00