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Command line utility for purging Window's standby list. Requires /MANIFESTUAC:"level='highestAvailable'.
#include <windows.h>
#include <stdio.h>
#include <tchar.h>
#define NT_SUCCESS(Status) (((NTSTATUS)(Status)) >= 0)
#define STATUS_PRIVILEGE_NOT_HELD ((NTSTATUS)0xC0000061L)
typedef enum _SYSTEM_INFORMATION_CLASS {
SystemMemoryListInformation = 80, // 80, q: SYSTEM_MEMORY_LIST_INFORMATION; s: SYSTEM_MEMORY_LIST_COMMAND (requires SeProfileSingleProcessPrivilege)
} SYSTEM_INFORMATION_CLASS;
// private
typedef enum _SYSTEM_MEMORY_LIST_COMMAND
{
MemoryCaptureAccessedBits,
MemoryCaptureAndResetAccessedBits,
MemoryEmptyWorkingSets,
MemoryFlushModifiedList,
MemoryPurgeStandbyList,
MemoryPurgeLowPriorityStandbyList,
MemoryCommandMax
} SYSTEM_MEMORY_LIST_COMMAND;
BOOL GetPrivilege(HANDLE TokenHandle, LPCSTR lpName, int flags)
{
BOOL bResult;
DWORD dwBufferLength;
LUID luid;
TOKEN_PRIVILEGES tpPreviousState;
TOKEN_PRIVILEGES tpNewState;
dwBufferLength = 16;
bResult = LookupPrivilegeValueA(0, lpName, &luid);
if (bResult)
{
tpNewState.PrivilegeCount = 1;
tpNewState.Privileges[0].Luid = luid;
tpNewState.Privileges[0].Attributes = 0;
bResult = AdjustTokenPrivileges(TokenHandle, 0, &tpNewState, (LPBYTE)&(tpNewState.Privileges[1]) - (LPBYTE)&tpNewState, &tpPreviousState, &dwBufferLength);
if (bResult)
{
tpPreviousState.PrivilegeCount = 1;
tpPreviousState.Privileges[0].Luid = luid;
tpPreviousState.Privileges[0].Attributes = flags != 0 ? 2 : 0;
bResult = AdjustTokenPrivileges(TokenHandle, 0, &tpPreviousState, dwBufferLength, 0, 0);
}
}
return bResult;
}
int _tmain(int argc, _TCHAR* argv[])
{
HANDLE hProcess = GetCurrentProcess();
HANDLE hToken;
if (!OpenProcessToken(hProcess, TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES, &hToken))
{
fprintf(stderr, "Can't open current process token\n");
return 1;
}
if (!GetPrivilege(hToken, "SeProfileSingleProcessPrivilege", 1))
{
fprintf(stderr, "Can't get SeProfileSingleProcessPrivilege\n");
return 1;
}
CloseHandle(hToken);
HMODULE ntdll = LoadLibrary(L"ntdll.dll");
if (!ntdll)
{
fprintf(stderr, "Can't load ntdll.dll, wrong Windows version?\n");
return 1;
}
typedef DWORD NTSTATUS; // ?
NTSTATUS (WINAPI *NtSetSystemInformation)(INT, PVOID, ULONG) = (NTSTATUS (WINAPI *)(INT, PVOID, ULONG))GetProcAddress(ntdll, "NtSetSystemInformation");
NTSTATUS (WINAPI *NtQuerySystemInformation)(INT, PVOID, ULONG, PULONG) = (NTSTATUS (WINAPI *)(INT, PVOID, ULONG, PULONG))GetProcAddress(ntdll, "NtQuerySystemInformation");
if (!NtSetSystemInformation || !NtQuerySystemInformation)
{
fprintf(stderr, "Can't get function addresses, wrong Windows version?\n");
return 1;
}
SYSTEM_MEMORY_LIST_COMMAND command = MemoryPurgeStandbyList;
NTSTATUS status = NtSetSystemInformation(
SystemMemoryListInformation,
&command,
sizeof(SYSTEM_MEMORY_LIST_COMMAND)
);
if (status == STATUS_PRIVILEGE_NOT_HELD)
{
fprintf(stderr, "Insufficient privileges to execute the memory list command");
}
else if (!NT_SUCCESS(status))
{
fprintf(stderr, "Unable to execute the memory list command %p", status);
}
return NT_SUCCESS(status);
}
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