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CORE-16757 After doing investigations on the priority class structure alignment, it's been revealed that in Windows XP and Server 2003 this PROCESS_PRIORITY_CLASS structure is aligned as a 4-bytes of size hence NtQueryInformationProcess() probes the alignment of user mode arguments buffer output and buffer length with requirement of a ULONG. As PROCESS_PRIORITY_CLASS was initially aligned as a 1-byte size because both BOOLEAN and UCHAR are just unsigned characters, the compiler may not align such structure and gracefully let the default alignment of such structure as is, 1-byte because an unsigned char has a size of 1 byte. Setting an align attribute to this structure fixes the problem of a potential datatype misalignment which caused GetPriorityClass() to not retrieve the process' priority class properly. |
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