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* [libFuzzer] Disable MSan interceptors in SIGINT handler.Matt Morehouse2019-04-261-1/+2
| | | | | | | | | | | | | | | | | | | | | | Summary: Avoids an MSan false positive if the SIGINT comes while the user callback is running. The false positive happens when the interrupt handler calls opendir() to remove some temporary files, which is intercepted by MSan. Fixes https://github.com/google/oss-fuzz/issues/2332. Reviewers: kcc Reviewed By: kcc Subscribers: llvm-commits, Dor1s, metzman Tags: #llvm Differential Revision: https://reviews.llvm.org/D61163 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@359254 91177308-0d34-0410-b5e6-96231b3b80d8
* [CMake] Add fuzzer as a component for runtime buildsChris Bieneman2019-04-191-0/+2
| | | | | | Calling `add_compiler_rt_component` sets up the component connection between runtime builds and the parent CMake configuration. Adding this call allows specifying `fuzzer` as a `LLVM_RUNTIME_DISTRIBUTION_COMPONENT`. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@358780 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] revert part of r358726 committed by mistake (oops)Kostya Serebryany2019-04-191-1/+0
| | | | git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@358727 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] in fork mode, make sure the child stats are always collected. ↵Kostya Serebryany2019-04-192-2/+4
| | | | | | This should fix the flakiness in fork-ubsan.test git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@358726 91177308-0d34-0410-b5e6-96231b3b80d8
* Summary:Jonathan Metzman2019-04-181-15/+75
| | | | | | | | | | | | | | | | | | | | | | Add close_fd_mask functionality to AFL driver. Summary: Add support for env var AFL_DRIVER_CLOSE_FD_MASK which behaves the same as libFuzzer's -close_fd_mask=1. Also add tests. Reviewers: kcc, vitalybuka, morehouse Reviewed By: morehouse Subscribers: #sanitizers, llvm-commits Tags: #sanitizers, #llvm Differential Revision: https://reviews.llvm.org/D60334 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@358703 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] Remove tautological compare.Matt Morehouse2019-04-161-2/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@358510 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] speedup the merge step in the fork mode by merging only the ↵Kostya Serebryany2019-04-132-8/+34
| | | | | | files that have unique features. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@358320 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] add -features_dir= flag to dump unique input features on diskKostya Serebryany2019-04-139-6/+53
| | | | git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@358317 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] Fix DataFlow.cpp logic when tracing long inputs.Max Moroz2019-04-122-11/+18
| | | | | | | | | | | | | | | | | | | | | | | | | Summary: 1. Do not create DFSan labels for the bytes which we do not trace. This is where we run out of labels at the first place. 2. When dumping the traces on the disk, make sure to offset the label identifiers by the number of the first byte in the trace range. 3. For the last label, make sure to write it at the last position of the trace bit string, as that label represents the input size, not any particular byte. Also fixed the bug with division in python which I've introduced when migrated the scripts to Python3 (`//` is required for integral division). Otherwise, the scripts are wasting too much time unsuccessfully trying to collect and process traces from the long inputs. For more context, see https://github.com/google/oss-fuzz/issues/1632#issuecomment-481761789 Reviewers: kcc Reviewed By: kcc Subscribers: delcypher, #sanitizers, llvm-commits Tags: #llvm, #sanitizers Differential Revision: https://reviews.llvm.org/D60538 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@358311 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] support -runs=N in the fork mode. Make sure we see one-line ↵Kostya Serebryany2019-04-121-1/+9
| | | | | | reports from ubsan in the fork mode. Test both git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@358306 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] Make MutateWithMask work when the Mask is shorter than the input.Max Moroz2019-04-111-3/+3
| | | | | | | | | | | | | | | | | | | Summary: Before this change, MutateWithMask used to assert that Mask should be of sufficient length (>= Size of the input). However, in real cases we may have inputs that are longer than the Mask they have inherited from the based inputs. Reviewers: kcc, morehouse Reviewed By: kcc Subscribers: delcypher, #sanitizers, llvm-commits Tags: #llvm, #sanitizers Differential Revision: https://reviews.llvm.org/D60571 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@358207 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] Fallback to default Mutate when MutateWithMask fails.Max Moroz2019-04-112-1/+4
| | | | | | | | | | | | | | | | | | | | | | Summary: In case the current corpus input doesn't have bytes going into the focus function, MutateWithMask is useless and may fail gently, allowing the default mutation routine happen, rather than crashing on an assertion. For more context and the initial fix suggestion, see: https://github.com/google/oss-fuzz/issues/1632#issuecomment-481862879 Reviewers: kcc, morehouse Reviewed By: kcc Subscribers: delcypher, #sanitizers, llvm-commits Tags: #llvm, #sanitizers Differential Revision: https://reviews.llvm.org/D60567 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@358190 91177308-0d34-0410-b5e6-96231b3b80d8
* Use binary write mode in WriteToFile function to avoid appended \r ↵Vitaly Buka2019-04-051-1/+1
| | | | | | | | | | | | | | | | | | | | | characters on Windows Summary: When using libfuzzer on Windows, in the contents of a crash sample, bytes that can be mistaken for a \n are replaced by a \r\n sequence. As a consequence, crashes are not reproducible. This patch will open files in binary mode to fix this issue. The patch does not affect POSIX systems. Patch by tuktuk Reviewers: kcc, vitalybuka Reviewed By: vitalybuka Subscribers: dexonsmith, jdoerfert, llvm-commits, #sanitizers Tags: #llvm, #sanitizers Differential Revision: https://reviews.llvm.org/D60008 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@357807 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] Another follow up fix for Data Flow scripts in Py3.Max Moroz2019-04-041-2/+6
| | | | | | | | | | | | | | Reviewers: Dor1s Reviewed By: Dor1s Subscribers: delcypher, #sanitizers, llvm-commits Tags: #llvm, #sanitizers Differential Revision: https://reviews.llvm.org/D60289 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@357732 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] Fix output format in data flow merge script after Py3 change.Max Moroz2019-04-041-1/+1
| | | | | | | | | | | | | | Reviewers: Dor1s Reviewed By: Dor1s Subscribers: delcypher, #sanitizers, llvm-commits Tags: #llvm, #sanitizers Differential Revision: https://reviews.llvm.org/D60288 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@357730 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] Make DataFlow scripts Python3 compatible.Max Moroz2019-04-042-6/+8
| | | | | | | | | | | | | | | | | | | Summary: Python2 will hit end of life soon: https://pythonclock.org/ This change also makes the integration with OSS-Fuzz a bit simpler: https://github.com/google/oss-fuzz/issues/1632 Reviewers: morehouse, kcc Reviewed By: morehouse Subscribers: delcypher, #sanitizers, llvm-commits Tags: #llvm, #sanitizers Differential Revision: https://reviews.llvm.org/D60282 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@357726 91177308-0d34-0410-b5e6-96231b3b80d8
* [CMake][LibFuzzer] Match symbol visibility setting between LibFuzzer object ↵Dan Liew2019-02-281-0/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | files and unit tests. Summary: This fixes inconsistent symbol visibility. This shows up as a linker warning if r336238 (43f633564e338a6dde83d49a48e5bfcbfdce292c) is reverted. ``` ld: warning: direct access in function 'fuzzer::CleanseCrashInput(std::__1::vector<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, fuzzer::fuzzer_allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > > > const&, fuzzer::FuzzingOptions const&)' from file '/Volumes/data/dev/llvm/upstream/master/builds/projects/compiler-rt/lib/fuzzer/tests/libRTFuzzerTest.x86_64.a(FuzzerDriver.cpp.o)' to global weak symbol 'fuzzer::Command::ignoreRemainingArgs()::kIgnoreRemaining' from file 'FuzzerTestObjects.FuzzerUnittest.cpp.x86_64.o' means the weak symbol cannot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility settings. ``` r336238 just hid the issue rather than fixing the real issue. On macOS and other platforms we usually compile with `-fvisibility=hidden` but the unit tests were compiled without this flag. Reviewers: george.karpenkov, kubamracek, kcc, yln Subscribers: mgorny, #sanitizers, llvm-commits Tags: #llvm, #sanitizers Differential Revision: https://reviews.llvm.org/D58055 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@355143 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer][Windows] Port fork mode to WindowsJonathan Metzman2019-02-275-12/+77
| | | | | | | | | | | | | | | | | | | | | Summary: Port libFuzzer's fork mode to Windows. Implement Windows versions of MkDir, RmDir, and IterateDirRecursive to do this. Don't print error messages under new normal uses of FileSize (on a non-existent file). Implement portable way of piping output to /dev/null. Fix test for Windows and comment fork-sigusr.test on why it won't be ported to Win. Reviewers: zturner Reviewed By: zturner Subscribers: kcc, zturner, jdoerfert, #sanitizers, llvm-commits Tags: #sanitizers, #llvm Differential Revision: https://reviews.llvm.org/D58513 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@355019 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] fix missing close on opened fileVitaly Buka2019-02-261-0/+1
| | | | | | | | | | | | | | | | | | | | Summary: When running the standalone main on a large corpus, I eventually get a EMFILE error ("Too many open files"). Patch by Paul Chaignon Reviewers: kcc, vitalybuka Reviewed By: vitalybuka Subscribers: lebedev.ri, #sanitizers, llvm-commits Tags: #llvm, #sanitizers Differential Revision: https://reviews.llvm.org/D58622 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@354918 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] Remove extra semicolonsJonathan Metzman2019-02-263-5/+5
| | | | | | | | | | | | | | | | | | Summary: Remove extra semicolons so that libFuzzer can compile with -Werror -Wextra-semi Reviewers: Dor1s, morehouse, thakis Reviewed By: Dor1s, morehouse Subscribers: jdoerfert, #sanitizers, llvm-commits Tags: #sanitizers, #llvm Differential Revision: https://reviews.llvm.org/D58674 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@354902 91177308-0d34-0410-b5e6-96231b3b80d8
* [compiler-rt] Fix broken sanitizer bots (hopefully)Jonas Hahnfeld2019-02-171-3/+0
| | | | | | | | | | | | | | | | | | | According to the logs and local debugging there were two issues: 1) tsan tests listed libc++.a before the source file. That's usually ok for shared libraries, but the linker will not add symbols from a static library unless needed at that time. As a result the tests that rely upon symbols from the library (and not only include the headers) had undefined references. To solve this I'm adding a new substitution %link_libcxx_tsan which expands to libc++.a if available. 2) The target Fuzzer-x86_64-Test linked in SANITIZER_TEST_CXX_LIBRARIES which defaults to -lstdc++. This resulted in error messages like hidden symbol '_ZdlPv' is not defined locally hidden symbol '_Znwm' is not defined locally when using GNU gold (ld.bfd and lld are fine). Removing the linkage is fine because we build a custom libc++ for that purpose. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@354231 91177308-0d34-0410-b5e6-96231b3b80d8
* [compiler-rt] Build custom libcxx with libcxxabiJonas Hahnfeld2019-02-172-10/+13
| | | | | | | | | | | | | | | This changes add_custom_libcxx to also build libcxxabi and merges the two into a static and hermetic library. There are multiple advantages: 1) The resulting libFuzzer doesn't expose C++ internals and looks like a plain C library. 2) We don't have to manually link in libstdc++ to provide cxxabi. 3) The sanitizer tests cannot interfere with an installed version of libc++.so in LD_LIBRARY_PATH. Differential Revision: https://reviews.llvm.org/D58013 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@354212 91177308-0d34-0410-b5e6-96231b3b80d8
* [compiler-rt] Cleanup usage of C++ ABI libraryJonas Hahnfeld2019-02-161-4/+5
| | | | | | | | | | | | | Add missed value "libcxxabi" and introduce SANITIZER_TEST_CXX for linking unit tests. This needs to be a full C++ library and cannot be libcxxabi. Recommit r354132 which I reverted in r354153 because it broke a sanitizer bot. This was because of the "fixes" for pthread linking, so I've removed these changes. Differential Revision: https://reviews.llvm.org/D58012 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@354198 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] make len_control less agressive: set the initial max len to the ↵Kostya Serebryany2019-02-161-1/+5
| | | | | | length of the largest seed. This was the original intent, but... Now, with a test, to ensure it stays this way git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@354191 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] fork mode: try harder to cleanup after itselfKostya Serebryany2019-02-162-11/+21
| | | | git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@354186 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] form mode: add -ignore_crashes flag, honor the max_total_time ↵Kostya Serebryany2019-02-158-23/+66
| | | | | | flag, print the number of ooms/timeouts/crashes, fix a typo git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@354175 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert "[compiler-rt] Cleanup usage of C++ ABI library"Jonas Hahnfeld2019-02-151-5/+4
| | | | | | | This reverts r354132 because it breaks sanitizer-x86_64-linux: http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux/builds/19915 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@354153 91177308-0d34-0410-b5e6-96231b3b80d8
* [compiler-rt] Cleanup usage of C++ ABI libraryJonas Hahnfeld2019-02-151-4/+5
| | | | | | | | | Add missed value "libcxxabi" and introduce SANITIZER_TEST_CXX for linking unit tests. This needs to be a full C++ library and cannot be libcxxabi. Differential Revision: https://reviews.llvm.org/D58012 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@354132 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] print new functions as they are discovered in the fork modeKostya Serebryany2019-02-154-11/+33
| | | | git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@354092 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] fix the unit testsKostya Serebryany2019-02-153-12/+14
| | | | git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@354088 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] when doing the merge, keep track of the coveraged edges, not ↵Kostya Serebryany2019-02-154-25/+33
| | | | | | just features git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@354087 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] when doing the merge, keep track of the coveraged edges, not ↵Kostya Serebryany2019-02-146-51/+82
| | | | | | just features git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@354076 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] better stats for the fork modeKostya Serebryany2019-02-141-5/+44
| | | | git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@354061 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] trying to fix the bot (can't reproduce the build failure locally)Kostya Serebryany2019-02-141-1/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@354000 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] add threads to the fork mode: now you can pass -fork=N to run N ↵Kostya Serebryany2019-02-143-90/+147
| | | | | | concurrent workers. Fork mode is still work-in-progress. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@353997 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] a bit of refactoring of the fork modeKostya Serebryany2019-02-136-74/+153
| | | | git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@353910 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] move the implementation of the fork mode into a separate fileKostya Serebryany2019-02-126-93/+165
| | | | git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@353891 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] make the fork mode less verboseKostya Serebryany2019-02-125-28/+52
| | | | git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@353794 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] teach the fork mode to ignore OOMs and timeoutsKostya Serebryany2019-02-124-6/+12
| | | | git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@353792 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] replace slow std::mt19937 with a much faster std::minstd_rand; ↵Kostya Serebryany2019-02-122-4/+5
| | | | | | second attempt after failed r352732, this time with a fix for cmake git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@353782 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] simplify the code for print_coverage=1 so that it doesn't fail ↵Kostya Serebryany2019-02-121-2/+2
| | | | | | on broken debug info git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@353781 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] extend the -fork=1 functionality. Still not fully usable, but ↵Kostya Serebryany2019-02-1211-35/+108
| | | | | | good enough for the first unit test git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@353775 91177308-0d34-0410-b5e6-96231b3b80d8
* [Fuzzer] Fix function prototype in fuzzer::ExternalFunctions. [NFC]David L. Jones2019-02-091-1/+1
| | | | | | | | | | | | | | The __sanitizer_acquire_crash_state function has int return type, but the fuzzer's external function definitions give it bool. Places where __sanitizer_acquire_crash_state is declared: include/sanitizer_common/sanitizer_interface_defs.h lib/sanitizer_common/sanitizer_interface_internal.h lib/sanitizer_common/sanitizer_common.cc lib/fuzzer/FuzzerExtFunctions.def (this is the only bool) git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@353596 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] more refactoring; change some of the exit codes (timeout, OOM, ↵Kostya Serebryany2019-02-096-39/+57
| | | | | | interrupt) so that the parent process can distinguish those git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@353584 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] refactor the merging code, NFCKostya Serebryany2019-02-083-37/+52
| | | | git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@353576 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] remove two unused experimental flagsKostya Serebryany2019-02-085-64/+4
| | | | git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@353573 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] introduce an experimental mode -fork=1, where fuzzing happens in ↵Kostya Serebryany2019-02-087-52/+89
| | | | | | a subprocess (still running multiple inputs per process), thus making the fuzzing more resilient to timeouts and OOMs. This is just a skeleton of the code, and some associated refactoring, not a fully working feature yet. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@353570 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer] refactor the way we choose the element to cross-over with, NFC ↵Kostya Serebryany2019-02-086-19/+43
| | | | | | (expected1); add a flag -seed_inputs= to pass extra seed inputs as file paths, not dirs git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@353494 91177308-0d34-0410-b5e6-96231b3b80d8
* [libFuzzer][Windows] Clean up RawPrintJonathan Metzman2019-02-041-2/+1
| | | | | | | | | | | | | | | | Summary: Use `_write` instead of the deprecated alias `write` on Windows. Also, remove comment saying RawPrint is untested on Windows. Reviewers: vitalybuka Reviewed By: vitalybuka Subscribers: vitalybuka Differential Revision: https://reviews.llvm.org/D57589 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@353108 91177308-0d34-0410-b5e6-96231b3b80d8
* [fuzzer] Use RawPrint instead of Printf for instrumentation warningJonathan Metzman2019-01-312-7/+11
| | | | | | | | | | | | | | | Summary: Use RawPrint instead of Printf for instrumentation warning because Printf doesn't work on Win when instrumentation is being initialized (since OutputFile is not yet initialized). Reviewers: kcc Reviewed By: kcc Differential Revision: https://reviews.llvm.org/D57531 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@352789 91177308-0d34-0410-b5e6-96231b3b80d8
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