Error 5 In Call Openprocess Access Is Denied
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Openprocess Error
Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up OpenProcess: access openprocess access denied administrator denied error only on Windows 8.1 up vote 1 down vote favorite 3 I have a program which adjusts SeDebugPrivilege and then starts to iterate through system processes and calls OpenProcess for them (and does other stuff, but it's not important now). Also the program runs in administrator mode of course. On Windows XP and Windows 7 it works fine, but on Windows 8.1 openprocess error 5 OpenProcess fails for the following system processes with ERROR_ACCESS_DENIED(5): smss.exe, csrss.exe, services.exe. As I know with SeDebugPrivilege I should be able to open these processes and retrieve a handle for them. Does anybody have a clue, what kind of magic causes this error only on Windows 8.1? (Anyway I have the same error with the same processes for CreateToolhelp32Snapshot) windows winapi windows-8.1 openprocess share|improve this question asked Feb 3 '15 at 16:05 Zoltán Várnagy 378 I guess you don't have enough rights any more. –David Heffernan Feb 3 '15 at 16:06 add a comment| 2 Answers 2 active oldest votes up vote 1 down vote accepted Windows 8.1 introduces the concept of a system protected process. This is documented in the context of third-party anti-malware software, but it seems reasonable to suppose that it is also used to protect particularly critical system processes. System protected processes are an extension of the Protected Process mechanism (Microsoft Word document) introduced in Windows Vista as a DRM measure. You cannot obtain any of these access rights for a protected process, even with debug privilege: DELETE READ_CONTROL WRITE_DAC WRITE_OWNER PROCESS_CREATE_THREAD PROCESS_DUP_HANDLE PROCESS_QUERY_INFORM
Access Denied (Error 5) when using OpenProcess() 8th November 2015, 02:59 AM #1
Process_query_information
synestra n00bie Join Date: Oct 2015 Posts: 3 Reputation: 10 process_vm_read Rep Power: 24 Access Denied (Error 5) when using OpenProcess() "System.ComponentModel.Win32Exception: Access is denied", this
Adjusttokenprivileges
error is appearing while I am attempting to do two things: while attempting this (Code block 1): Code: _class = new Proc(Process.GetProcessesByName("procname")[0]); then in the http://stackoverflow.com/questions/28303436/openprocess-access-denied-error-only-on-windows-8-1 class Proc whats happening is Code: public Proc(Process _SelectedProcess) { Process = _SelectedProcess; } public Process Process { get { return SelectedProcess; } set { SelectedProcess = value; if (SelectedProcess != null) { Process.EnterDebugMode(); _Reader = new Win32_Memory(value.Handle, value.MainModule.BaseAddress.ToInt32(), value.Id); } } } sometimes this passes without any exception for no http://www.unknowncheats.me/forum/c/161514-access-denied-error-5-using-openprocess.html apparent reason as far as I see. Note: it never passes in windows 7, I'm using windows 10 and sometimes it happens that the function works but if it does pass, the next time I need to use OpenProcess() outside of the Process class, I almost always get the exception, and if i do, then afterwards it fails executing code block 1 if I try to do so again. this (code block 2) also gets the same access denied error, and sometimes doesnt... Code: if (_Reader.ReadInt(_addr) == 1) _Reader.Write(_addr, 0); public bool Write(int address, long value) { hProc = OpenProcess(ProcessAccessFlags.VMWrite, false, ID); byte[] val = BitConverter.GetBytes(value); bool worked = WriteProcessMemory(hProc, new IntPtr(address), val, (uint)val.LongLength, 0); CloseHandle(hProc); return worked; } the access flags: Code: [Flags] public enum ProcessAccessFlags : uint { All = 0x001F0FFF, Terminate = 0x00000001, CreateThread = 0x00000002, VMOperation = 0x00000008, VMRead = 0x00000010, VMWrite = 0x00000020, DupHandle =
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