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Lothrik
Newbie cheater
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Joined: 18 Mar 2009
Posts: 18
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 Posted: Wed Mar 31, 2010 2:11 pm Post subject: [C++]Writing to memory problem |
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I'm able to read/write from 0F000000~1F000000 just fine. This memory region has AllocationProtect=Read/Write.
I can read from 00400000~00800000 just fine. This memory region has AllocationProtect=Execute/Write Copy.
If I try to write to any address in 00400000~00800000 however, the program almost always terminates, and my memory reader doesn't show any change at the addresses I tried to write to.
This is how I write to memory:
| Code: | template <class T> static void WriteMemory(const DWORD writeAddress, const T writeData)
{
if (writeAddress == 0)
return;
T *pWriteAddress = reinterpret_cast<T *>(writeAddress);
if (pWriteAddress == 0)
return;
*pWriteAddress = writeData;
} |
This is how I read from memory:
| Code: | static MULTI_TYPE ReadMemory(const DWORD readAddress)
{
if (readAddress == 0)
return TypeMgr::GEN_MULTI_TYPE((BYTE)0);
uint64 *pReadAddress = reinterpret_cast<uint64 *>(readAddress);
if (pReadAddress == 0)
return TypeMgr::GEN_MULTI_TYPE((BYTE)0);
return TypeMgr::GEN_MULTI_TYPE(*pReadAddress);
} |
.. and just for reference, this is what MULTI_TYPE means:
| Code: | union MULTI_TYPE
{
BYTE bVal;
WORD wVal;
DWORD dwVal;
float fVal;
double dVal;
uint64 ui64Val;
}; |
I've tried using VirtualProtect to change the AllocationProtect on the addresses I try to write to, but it ALWAYS fails, even if I change my Token Privileges, with this (just to clarify, I have checked and this AdjustPrivileges() function does "work", at least in the sense that no errors occur).
| Code: | bool AdjustPrivileges()
{
HANDLE hToken;
TOKEN_PRIVILEGES newTP;
TOKEN_PRIVILEGES oldTP;
DWORD dwSize = sizeof(TOKEN_PRIVILEGES);
LUID Luid;
if (!OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken))
{
if (GetLastError() == ERROR_CALL_NOT_IMPLEMENTED)
return true;
return false;
}
if (!LookupPrivilegeValue(NULL, SE_DEBUG_NAME, &Luid))
{
CloseHandle(hToken);
return false;
}
ZeroMemory(&newTP, sizeof(newTP));
newTP.PrivilegeCount = 1;
newTP.Privileges[0].Luid = Luid;
newTP.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
// Adjust Token Privileges
if (!AdjustTokenPrivileges(hToken, FALSE, &newTP, sizeof(TOKEN_PRIVILEGES), &oldTP, &dwSize))
{
CloseHandle(hToken);
return false;
}
// close handle
CloseHandle(hToken);
return true;
} |
If I try to write to the problematic addresses in question, it works just fine, and my memory reader reports the changes Cheat Engine made instantly.
I'm at a bit of a loss for what I can do. My program is an injected DLL.
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Slugsnack
Grandmaster Cheater Supreme
![]() Reputation: 71
Joined: 24 Jan 2007
Posts: 1857
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| Posted: Wed Mar 31, 2010 2:57 pm Post subject: |
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| VirtualQuery() to make sure you are getting regions of allocated memory.
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Lothrik
Newbie cheater
![]() Reputation: 0
Joined: 18 Mar 2009
Posts: 18
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| Posted: Wed Mar 31, 2010 3:34 pm Post subject: |
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Got the VirtualQuery to work:
PAGE_EXECUTE_READWRITE
MEM_COMMIT
MEM_IMAGE
Once I go in-game though, I get the message "Can't write to PAGE_EXECUTE_READ"
Edit: Hurrah! Finally got it to work with VirtualProtect ;D
Only problem now is the fact that the game thinks I have Cheat Engine open (haha, happens sometimes, only real fix is to relog/restart Windows it seems).
=)
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