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When called from ntdll.dll in user mode, these groups are almost exactly the same; they trap into kernel mode and call the equivalent function in ntoskrnl.exe via the SSDT. When calling the functions directly in ntoskrnl.exe (only possible in kernel mode), the Zw variants ensure kernel mode, whereas the Nt variants do not. [7]
When calling the functions directly in ntoskrnl.exe (only possible in kernel mode), the Zw variants ensure kernel mode, whereas the Nt variants do not. [1] The Zw prefix does not stand for anything. [2] Rtl is the second largest group of ntdll calls. These comprise the (extended) C Run-Time Library, which includes many utility functions that ...
Windows Resource Protection is a feature first introduced in Windows Vista and Windows Server 2008. It is available in all subsequent Windows operating systems, and replaces Windows File Protection. Windows Resource Protection prevents the replacement of critical system files, registry keys and folders.
Despite having an ".exe" file extension, native applications cannot be executed by the user (or any program in the Win32 or other subsystems). An example is the autochk.exe binary that runs chkdsk during the system initialization "Blue Screen". Other prominent examples are the services that implement the various subsystems, such as csrss.exe.
The Session Manager Subsystem is the first user-mode process started by the kernel. Once started it creates additional paging files with configuration data from HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management, [1] the environment variables located at the registry entry HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment, and DOS device mappings (e.g. CON ...
Using kernel stacks not allocated by the kernel; Modifying or patching code contained within the kernel itself, [8] or the HAL or NDIS kernel libraries [9] Kernel Patch Protection only defends against device drivers modifying the kernel. It does not offer any protection against one device driver patching another. [10]
For example, in Windows XP and other versions, "rundll32.exe" shell32.dll,Options_RunDLL 0 is executed on the command line when a user launches the "Folder Options" applet in the Control Panel. The user's Desktop is a special folder that resides at the root of the Shell namespace. Although this folder maps by default to a physical folder stored ...
Classic "Begin logon" dialog box on Windows XP Windows 11 lock screen, requiring user to press Ctrl+Alt+Delete.. Winlogon (Windows Logon) is the component of Microsoft Windows operating systems that is responsible for handling the secure attention sequence, loading the user profile on logon, creates the desktops for the window station, and optionally locking the computer when a screensaver is ...