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MSVC does not actually support ubsan. There is a long-standing ticket requesting this: https://developercommunity.visualstudio.com/t/add-support-for-ubsan/840750 There are no known compilers that currently accept the `/fsanitize=undefined` spelling. clang-cl accepts `-fsanitize...`, same as regular clang. Also passes no-sanitizer-recover so that tests actually fail. Fix various ubsan-detected errors, including: * win: fix req-inl.h ubsan failure Don't use CONTAINING_RECORD macro from WinSDK, as it doesn't use the right trick which avoids member access on null pointer. Fixes: ``` src/win/req-inl.h:86:10: runtime error: member access within null pointer of type 'uv_req_t' (aka 'struct uv_req_s') SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior D:/a/libuv/libuv/src/win/req-inl.h:86:10 ``` * test: fix ubsan failure on udp_ref3 Don't call functions through different function type. Fixes: ``` src/win/udp.c:537:5: runtime error: call to function req_cb through pointer to incorrect function type 'void (*)(struct uv_udp_send_s *, int)' test\test-ref.c:66: note: req_cb defined here SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior src/win/udp.c:537:5 in ``` * win: fix process-stdio.c ubsan failure When accessing HANDLEs within the stdio buffer, use memcpy / memset in order to respect alignment. Fixes: ``` src/win/process-stdio.c:197:5: runtime error: store to misaligned address 0x0230ee72d107 for type 'HANDLE' (aka 'void *'), which requires 8 byte alignment 0x0230ee72d107: note: pointer points here 00 00 cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd fd fd fd fd ^ SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior src/win/process-stdio.c:197:5 in ``` * win: fix getaddrinfo.c ubsan failure Reworks buffer alignment handling to respect requirements. Fixes: ``` src/win/getaddrinfo.c:157:23: runtime error: member access within misaligned address 0x0290e4c6a17c for type 'struct addrinfo', which requires 8 byte alignment 0x0290e4c6a17c: note: pointer points here 00 00 00 00 cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd ^ SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior src/win/getaddrinfo.c:157:23 in ``` * win: fix pipe.c ubsan failure Changes "random" representation from pointer to number. Fixes: ``` src/win/pipe.c:234:11: runtime error: applying non-zero offset to non-null pointer 0xffffffffffffffff produced null pointer SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior src/win/pipe.c:234:11 in ``` * unix: fix stream.c ubsan failure Avoids performing pointer arithmetic on null pointer. Fixes: ``` src/unix/stream.c:701:15: runtime error: applying zero offset to null pointer SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /Users/runner/work/libuv/libuv/src/unix/stream.c:701:15 in ```