Alfred Agrell (@Alcaro) commented about dlls/ntdll/unix/system.c:
+ if (fd >= 0) + close(fd); + return STATUS_UNSUCCESSFUL; +#elif defined(__APPLE__) + if(!name || !vendor || (name && vendor && !retlen && !attrib)) + { + return STATUS_INVALID_PARAMETER; + } + + /* + * Since 2006, Mac computers use Extensible Firmware Interface (EFI). + * Apple requires a developer account and mandatory code signing, + * and the entire system boot process is verified, we can return SecureBoot enabled. + * Reference: https://support.apple.com/guide/security/uefi-firmware-security-in-an-intel-... + */ + if(vendor->Data1 == 0x8be4df61 && vendor->Data2 == 0x93ca && vendor->Data3 == 0x11d2 && wcscmp(name->Buffer, L"SecureBoot") I'd memcmp the guid instead. And you forgot the ! on the wcscmp. And do L strings do the right thing in Unix side code?
Is this piece even tested? -- https://gitlab.winehq.org/wine/wine/-/merge_requests/6423#note_81633