go/src/runtime/syscall_windows_test.go
Line 815 in 01e072d
| | _PROCESS_ALL_ACCESS=syscall.STANDARD_RIGHTS_REQUIRED|syscall.SYNCHRONIZE|0xfff |
From winnt.h we can see that if we are running on a version of Windows greater than Vista, 0xFFFF should be or-ed with the STANDARD_RIGHTS_REQUIRED and SYNCHRONIZE flags.

• winnt.h#L11279*

#if (NTDDI_VERSION >= NTDDI_VISTA)
#define PROCESS_ALL_ACCESS        (STANDARD_RIGHTS_REQUIRED | SYNCHRONIZE | \
                                   0xFFFF)
#else
#define PROCESS_ALL_ACCESS        (STANDARD_RIGHTS_REQUIRED | SYNCHRONIZE | \
                                   0xFFF)
#endif