Openprocess Access Denied Error
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Openprocess Error
minute: Sign up OpenProcess: access 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 openprocess sedebugprivilege it works fine, but on Windows 8.1 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 fo
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more process_all_access about Stack Overflow the company Business Learn more about hiring developers or posting ads process_query_information with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow openprocesstoken is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up WinAPI: OpenProcess() returns error 5 with SeDebugPrivilege enabled for host process up http://stackoverflow.com/questions/28303436/openprocess-access-denied-error-only-on-windows-8-1 vote 0 down vote favorite I've got a routine where I process-walk to obtain the HANDLE of each process as I 'walk' down the list (which works fine), but my issue lies when I do: HANDLE h = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pe32.th32ProcessID) where PROCESS_ALL_ACCESS is the access token, handle inheritance is set to FALSE, and pe32 is a PROCESSENTRY32 GetLastError() returns error code 5, and all the handles that are made http://stackoverflow.com/questions/20725051/winapi-openprocess-returns-error-5-with-sedebugprivilege-enabled-for-host-pro are addresses which do not correspond to any appropriate process in Spy++32/64 (I've tried building the application under both platform targets, but as you'd expect, the result is the same). The code for setting SeDebugPrivilege for the host process which I'm using is: BOOL EnableDebugPrivilege(BOOL bEnable) { HANDLE hToken = nullptr; LUID luid; if (!OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES, &hToken)) return FALSE; if (!LookupPrivilegeValue(NULL, SE_DEBUG_NAME, &luid)) return FALSE; TOKEN_PRIVILEGES tokenPriv; tokenPriv.PrivilegeCount = 1; tokenPriv.Privileges[0].Luid = luid; tokenPriv.Privileges[0].Attributes = bEnable ? SE_PRIVILEGE_ENABLED : 0; if (!AdjustTokenPrivileges(hToken, FALSE, &tokenPriv, sizeof(TOKEN_PRIVILEGES), NULL, NULL)) return FALSE; return TRUE; } Some questions that would be helpful to you: I'm running Windows 7 x64 Professional. Yes, devenv.exe is started with "Run as Administrator" privileges, which means that the debugger and the application itself are started under the same affinity. I have tried toggling UAC or running the application with UAC off altogether. Still error code 5. I just attempted doing it with PROCESS_QUERY_LIMITED_INFORMATION and I receive error code 6, or ERROR_INVALID_HANDLE. Also attempted with PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, result is error 5 again. SeDebugPrivilege is enabled, verified with SysInternals' Process Explorer. Additionally, all processes that spawn from devenv/whatever the debugger is called inherit SeDebugPrivilege so...this is weird. Thank you all very much for your time, I
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow http://stackoverflow.com/questions/35732495/openprocess-access-is-denied-for-some-users the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 https://www.gamekiller.net/threads/resolved-c-openprocess-returns-access-denied.305035/ million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up OpenProcess Access is denied for some users up vote 1 down vote favorite 1 I have an application that access denied opens another non-system 32-bit process and attempts to get a list of its loaded modules with EnumProcessModulesEx and path of each module with GetModuleFileNameEx. It works well in my development environment (Windows 10) and for many users that have tested the application. However, for some users (two users, Windows 8.1 and Windows 10) the OpenProcess() function fails with Access is denied (error code 5). I am opening the process with PROCESS_QUERY_INFORMATION | openprocess access denied PROCESS_VM_READ. Opening the process with PROCESS_QUERY_LIMITED_INFORMATION works, but then EnumProcessModulesEx will fail. According to my testing, both PROCESS_QUERY_INFORMATION and PROCESS_VM_READ, if used alone, will fail OpenProcess() for users with the mentioned issue. Also I believe PROCESS_QUERY_INFORMATION | PROCESS_VM_READ is required for EnumPorcessModulesEx, so trying with less access rights is not an option. However, when the application is executed with "Run as administrator", this problem no longer occurs. OpenProcess() works and also the application works as expected. The problem hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, processid); Works for most users, but returns error code 5, access is denied for some users of the application. Partial solution ...is to run the application as administrator. OpenProcess() then works well. Question Why is access denied for some users when the application is executed without "Run as administrator"? Is there an alternative way to get a list of modules of another process without executing my application as administrator? c++ windows share|improve this question asked Mar 1 at 20:11 Lari Taskula 61 What is the other process? which user is it running as? –immibis Mar 1 at 20:25 Clearly the user doesn't have sufficient rights. –David Heffernan Mar 1 at 20:31 @immibis, the other process is an old game and both my application and the tar
this forum only Display results as threads Advanced Search Recent Posts GameKiller - Bringing The Pain To Each And Every Game Home Off Topic > Programming > Programming & Reversing Discussion > [RESOLVED] [C++] OpenProcess( ) returns ACCESS DENIED Discussion in 'Programming & Reversing Discussion' started by SatanClause, Mar 13, 2012. SatanClause Lurker Joined: Mar 13, 2012 Messages: 4 Likes Received: 0 Trophy Points: 1 THIS ISSUE HAS BEEN RESOLVED. PLEASE SEE FOURTH REPLY TO SEE MY SOLUTION IF THIS DESCRIBES AN ISSUE YOU ARE ENCOUNTERING Whatsup guys I've written a small console trainer for a video game with one purpose - to overwrite a specific address in memory. The problem: Although the trainer works as it should on my system, other users run into an identical error: Code: OpenProcess(PROCESS_ALL_ACCESS, FALSE, procID) returns ACCESS DENIED Considering PROCESS_ALL_ACCESS might be hefty to ask of an operating system, I've tried changing the access flags to something lower-level and gut it down to the ones my trainer requires : Code: OpenProcess(PROCESS_VM_READ | PROCESS_VM_WRITE, FALSE, procID) but even this returns ACCESS DENIED. I've looked into this issue on various forums and browsed through MSDN documentation and the solution might be SeDebugPrivilege to enable debugging privileges within the process. I have never used process tokens and never adjusted process privileges before, so I have no clue how to implement it in my trainer. Questions: Have any of you ever had this problem with OpenProcess() and how did you get around it? Have any of you ever adjusted privileges in your trainers, and would you kindly provide example code? Thank you I'll be checking back often for replies. P.S. I have 6 other individuals testing my trainer for me with various versions of Windows. None of whom have VC++ installed on their systems. Something to consider Last edited: Mar 16, 2012 SatanClause, Mar 13, 2012 #1 happyblade Veteran Hacker Jo