Signed overflow in InmemAddressRepository::upsertAddresses

src/peer/address_repository/inmem_address_repository.cpp のリンク先の行から始め、TTL が steady-clock の時点にどのように加算されているかを調べてください。提供されている Godbolt MRE と UBSAN レポートを使ってオーバーフローを再現してください。恒久的な TTL 値および非常に大きな TTL 値が signed overflow なしで定義された動作になること、またインターフェースの変更があれば反映されていることが完了条件です。

Summary

The following line
https://github.com/libp2p/cpp-libp2p/blob/093a3f7b0c9f45300f2ec88cc2bfabe083c5d2f2/src/peer/address_repository/inmem_address_repository.cpp#L103
Provokes a signed overflow, which is reported by UBSAN, if TTL is larger than several hundred years. In particular, libp2p::peer::ttl::kPermanent does trigger the overflow.
https://godbolt.org/z/ahcdE5Msq - an MRE.
Permanent ttl should be expressed in some valid way, and probably some type safer than chrono::milliseconds, that silently overflows, should be used in the interface.

Expected behavior

Expected defined behaviour.

Actual behavior

Actual behaviour is undefined due to signed overflow.

Relevant log output

/usr/lib64/gcc/x86_64-pc-linux-gnu/14.2.1/../../../../include/c++/14.2.1/bits/chrono.h:227:38: runtime error: signed integer overflow: 9223372036854775807 * 1000000 cannot be represented in type 'long'
24.11.28 14:52:30.896390  telemetry        Info      TelemetryConnection#1  Connection established
    #0 0x61348f7c8555 in std::chrono::duration<long, std::ratio<1l, 1000000000l>> std::chrono::__duration_cast_impl<std::chrono::duration<long, std::ratio<1l, 1000000000l>>, std::ratio<1000000l, 1l>, long, false, true>::__cast<long, std::ratio<1l, 1000l>>(std::chrono::duration<long, std::ratio<1l, 1000l>> const&) /usr/lib64/gcc/x86_64-pc-linux-gnu/14.2.1/../../../../include/c++/14.2.1/bits/chrono.h:227:38
    #1 0x61348f7c8250 in std::enable_if<__is_duration<std::chrono::duration<long, std::ratio<1l, 1000000000l>>>::value, std::chrono::duration<long, std::ratio<1l, 1000000000l>>>::type std::chrono::duration_cast<std::chrono::duration<long, std::ratio<1l, 1000000000l>>, long, std::ratio<1l, 1000l>>(std::chrono::duration<long, std::ratio<1l, 1000l>> const&) /usr/lib64/gcc/x86_64-pc-linux-gnu/14.2.1/../../../../include/c++/14.2.1/bits/chrono.h:289:11
    #2 0x61348fa7e150 in std::chrono::duration<long, std::ratio<1l, 1000000000l>>::duration<long, std::ratio<1l, 1000l>, void>(std::chrono::duration<long, std::ratio<1l, 1000l>> const&) /usr/lib64/gcc/x86_64-pc-linux-gnu/14.2.1/../../../../include/c++/14.2.1/bits/chrono.h:582:10
    #3 0x61348fea5010 in std::common_type<std::chrono::duration<long, std::ratio<1l, 1000000000l>>, std::chrono::duration<long, std::ratio<1l, 1000l>>>::type std::chrono::operator+<long, std::ratio<1l, 1000000000l>, long, std::ratio<1l, 1000l>>(std::chrono::duration<long, std::ratio<1l, 1000000000l>> const&, std::chrono::duration<long, std::ratio<1l, 1000l>> const&) /usr/lib64/gcc/x86_64-pc-linux-gnu/14.2.1/../../../../include/c++/14.2.1/bits/chrono.h:702:36
    #4 0x61348fea215b in std::chrono::time_point<std::chrono::_V2::steady_clock, std::common_type<std::chrono::duration<long, std::ratio<1l, 1000000000l>>, std::chrono::duration<long, std::ratio<1l, 1000l>>>::type> std::chrono::operator+<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l>>, long, std::ratio<1l, 1000l>>(std::chrono::time_point<std::chrono::_V2::steady_clock, std::chrono::duration<long, std::ratio<1l, 1000000000l>>> const&, std::chrono::duration<long, std::ratio<1l, 1000l>> const&) /usr/lib64/gcc/x86_64-pc-linux-gnu/14.2.1/../../../../include/c++/14.2.1/bits/chrono.h:1107:47
    #5 0x6134996c8f07 in libp2p::peer::InmemAddressRepository::upsertAddresses(libp2p::peer::PeerId const&, std::span<libp2p::multi::Multiaddress const, 18446744073709551615ul>, std::chrono::duration<long, std::ratio<1l, 1000l>>) /home/harrm/.hunter/_Base/3fb5849/417772a/9a920dc/Build/libp2p/Source/src/peer/address_repository/inmem_address_repository.cpp:103:36
...

Possible Solution

No response

Version

Commit c96d45f792fafd6970a7e37ec816b02a9167e2b6

Would you like to work on fixing this bug ?

Yes