Processes virtualization state in Software

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Processes virtualization state
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7 Security
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Applications such as cmdexe or regexe are not subject to virtualization because they have an application manifest specifying a requestedExecutionLevel in their manifests, as shown in Listing 159 Native x86-64 applications are not virtualized and will fail under a UAC account in the same way they failed on Windows XP, when running under the standard user account This provides the motivation for writing applications that does not require administrative privileges to work properly This enforcement has a minimal impact on the applications compatibility, as the number of x86-64 applications is still small
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WHY ARE APPLICATIONS NOT WORKING UNDER A STANDARD USER ACCOUNT Some applications write on locations protected by the operating system default security settings To write into those locations, the applications must run under a local administrator account Applications keeping their configurable setting in the installation folder or in a global registry hive, such as HKEY_LOCAL_MACHINE, are the common failure cases The easiest way to find those failures is testing the application under Application Verifier, as described in 1, Introduction to the Tools Another simple tool to evaluate this application behavior is the Microsoft Standard User Analyzer tool, available as a free download on Microsoft s Web site Fixing the application, during the development phase is the quickest and the most efficient solution to those problems As a positive side effect, the application is one step closer to being able to obtain the Certified for Windows Vista logo To find out all processes that are not meeting the standards for Windows Vista certification, a simple check of the virtual file and registry locations will most likely reveal them
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Besides the security changes made with the intent of creating the most secure version of Windows yet, Windows Vista introduced other security changes designed to prevent tampering with so-called protected processes A protected processes, usually a hosting media playback application, offer a higher degree of protection from tampering, especially when it uses media protected with DRM technologies Although the changes supporting protected process are implemented deeply in the kernel, they are manifesting themselves in the inability to debug such processes Microsoft MSDN has several whitepapers describing the protected process and the future of developments in this area You learned in this section what is behind security changes implemented in Windows Vista and the effect those changes have on software applications Furthermore, you learned the mechanisms to extract detailed information from the failing system, failure caused by those security changes
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15 WINDOWS VISTA FUNDAMENTALS
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8 Interprocess Communication
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The changes introduced by Windows Vista in the interprocess communication area are restricted to the boundaries of a single physical system Because the computers running Windows Vista must work seamlessly in a heterogeneous network, networkobservable behavior is similar to previous operating system behavior, and all techniques based on interpreting the network traffic are still applicable However, the communication model between various components within the same physical system has been changed The Lightweight Procedure Call (LPC) protocol has been replaced with the new Advanced Lightweight Procedure Call (ALPC) protocol, which is the foundation for other protocols
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RPC and DCOM Protocol Changes
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All the protocols built on top of ALPC have been changed to take advantage of the new communication paradigms DCOM and RPC have been also enhanced in the reliability and manageability area To improve the RPC debugging capability, its development team introduced two tracing channels In the Microsoft-Windows-Rpcss-EndpointMapper/Debug channel, the RPC infrastructure records each interface that is registered or unregistered with the EndpointMapper The Microsoft-Windows-RPC/EEInfo channel collects the error generated by the RPC infrastructure as described in 8, in the section RPC Extended Error Information As part of management improvements, DCOM has a tracing channel, MicrosoftWindows-COM/Analytic, that can capture events generated by the infrastructure However, at the time of writing, no information about how to enable this channel or how to interpret the events generated in this log was available
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