OSS-Fuzz: Add new fuzzer and corpora targets datetime process (PR #26963)

Arthur Chan

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Sep 2, 2026, 11:58:46 AMSep 2

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This PR creates a new fuzzer for wxwidgets project targets datetime process with seeds.

You can view, comment on, or merge this pull request online at:

https://github.com/wxWidgets/wxWidgets/pull/26963

Commit Summary

8a0b841 OSS-Fuzz: Add new fuzzer and corpora targets datetime process

File Changes

(20 files)

Patch Links:

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VZ

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Sep 3, 2026, 6:02:13 PMSep 3

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vadz left a comment (wxWidgets/wxWidgets#26963)

Thanks, this looks good, but I'd like to ask if you've already run this locally for testing? Because I'm a bit afraid we're going to get many problem reports for this code which had been never fuzzed before...

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Arthur Chan

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Oct 5, 2026, 12:03:12 AM (10 days ago) Oct 5

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arthurscchan left a comment (wxWidgets/wxWidgets#26963)

Sorry for the late reply cause I am kept busy on some other items. I will try running this locally for much longer time and came back with an estimated result. Thanks and sorry for keeping this a bit longer.

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Arthur Chan

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Oct 8, 2026, 3:59:12 AM (7 days ago) Oct 8

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@arthurscchan pushed 1 commit.

1b0047c Update assertion handling

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Arthur Chan

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Oct 8, 2026, 4:19:48 AM (7 days ago) Oct 8

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arthurscchan left a comment (wxWidgets/wxWidgets#26963)

Indeed, it got into some assertion errors. I have fixed that and run for 15 mins it keep increasing in coverage. So now it is good.

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VZ

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Oct 8, 2026, 7:41:12 AM (7 days ago) Oct 8

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vadz left a comment (wxWidgets/wxWidgets#26963)

OK, thanks, let's merge it and see what it finds.

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VZ

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Oct 8, 2026, 7:47:04 AM (7 days ago) Oct 8

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Merged #26963 into master.

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VZ

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Oct 10, 2026, 7:24:16 PM (4 days ago) Oct 10

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vadz left a comment (wxWidgets/wxWidgets#26963)

Actually we shouldn't disable asserts in the fuzzers, any input (even invalid) shouldn't result in asserts... And, moreover, it breaks when testing locally using the instructions in tests/fuzz/runner.cpp because the asserts don't get disabled in this case.

But the main problem is that I've already got a couple of failures in OSS-Fuzz and I can't reproduce one of them locally for some reason: both 0 Feb 16 00:00 G is supposed to result in the following error:

include/wx/longlong.h:151:16: runtime error: signed integer overflow: -9223372036829575808 - 85624192 cannot be represented in type 'long long'
	    #0 0x58fbbb164482 in operator-= [wxwidgets/include/wx/longlong.h:151](https://github.com/wxWidgets/wxWidgets/blob/51952bd3a8df8a18b412b08493d2f9a21b5b1d08/include/wx/longlong.h#L151):16
	    #1 0x58fbbb164482 in wxDateTime::GetTm(wxDateTime::TimeZone const&) const [wxwidgets/src/common/datetime.cpp:1514](https://github.com/wxWidgets/wxWidgets/blob/51952bd3a8df8a18b412b08493d2f9a21b5b1d08/src/common/datetime.cpp#L1514):18
	    #2 0x58fbbb167fb4 in GetYear [wxwidgets/include/wx/datetime.h:768](https://github.com/wxWidgets/wxWidgets/blob/51952bd3a8df8a18b412b08493d2f9a21b5b1d08/include/wx/datetime.h#L768):22
	    #3 0x58fbbb167fb4 in wxDateTime::IsDST(wxDateTime::Country) const [wxwidgets/src/common/datetime.cpp:2104](https://github.com/wxWidgets/wxWidgets/blob/51952bd3a8df8a18b412b08493d2f9a21b5b1d08/src/common/datetime.cpp#L2104):20
	    #4 0x58fbbb16890a in wxDateTime::MakeFromTimezone(wxDateTime::TimeZone const&, bool) [wxwidgets/src/common/datetime.cpp:2155](https://github.com/wxWidgets/wxWidgets/blob/51952bd3a8df8a18b412b08493d2f9a21b5b1d08/src/common/datetime.cpp#L2155):21
	    #5 0x58fbbb176f00 in MakeFromUTC [wxwidgets/include/wx/datetime.h:732](https://github.com/wxWidgets/wxWidgets/blob/51952bd3a8df8a18b412b08493d2f9a21b5b1d08/include/wx/datetime.h#L732):18
	    #6 0x58fbbb176f00 in wxDateTime::ParseRFC822TimeZone(wxString::const_iterator*, wxString::const_iterator const&) [wxwidgets/src/common/datetimefmt.cpp:859](https://github.com/wxWidgets/wxWidgets/blob/51952bd3a8df8a18b412b08493d2f9a21b5b1d08/src/common/datetimefmt.cpp#L859):5
	    #7 0x58fbbb177bd7 in wxDateTime::ParseRfc822Date(wxString const&, wxString::const_iterator*) [wxwidgets/src/common/datetimefmt.cpp:1022](https://github.com/wxWidgets/wxWidgets/blob/51952bd3a8df8a18b412b08493d2f9a21b5b1d08/src/common/datetimefmt.cpp#L1022):11
	    #8 0x58fbbb1189a1 in LLVMFuzzerTestOneInput [wxwidgets/tests/fuzz/datetime.cpp:84](https://github.com/wxWidgets/wxWidgets/blob/51952bd3a8df8a18b412b08493d2f9a21b5b1d08/tests/fuzz/datetime.cpp#L84):13
	    #9 0x58fbbb06f8ed in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:619:13
	    #10 0x58fbbb05a662 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:329:6
	    #11 0x58fbbb060530 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:865:9
	    #12 0x58fbbb08c062 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
	    #13 0x7aa3c6863082 in __libc_start_main /build/glibc-B3wQXB/glibc-2.31/csu/libc-start.c:308:16
	    #14 0x58fbbb05374d in _start

but doesn't here.

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Arthur Chan

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Oct 11, 2026, 12:13:46 AM (4 days ago) Oct 11

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arthurscchan left a comment (wxWidgets/wxWidgets#26963)

OK. I will followup on that, sorry for the mess.

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