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Created: Wednesday, March 6 2013 10:48.32 CST

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Branch tracing and LBR access from user-mode in windows.

Author: everdox

# Views: 15798

This article is an in-depth explanation of leveraging access to the debug_ctl MSR's from user-mode and how windows provides access to LBRs in it's ExceptionInformation[] structure.

The article goes on to explain a quick trick I discovered where the last branch can be located when a caller nukes it's call stack prior to a branch.

The article also explains how the features can be used to detect whether or not the program runs under the control of certain hyper-visors.

The in depth article can be found here: http://www.codeproject.com/Articles/517466/Last-branch-records-and-branch-tracing

An older article not by me discussing these features can also be found here: http://www.openrce.org/blog/view/535/Branch_Tracing_with_Intel_MSR_Registers

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