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The Buffer Security Check Switch The run-time checks are very cool, but another switch that you should always turn on is /GS, the Buffer Security Check switch. Unlike the /RTCx switches, /GS should be turned on for both debug and release builds. The purpose of /GS is to monitor the return address for a function to see whether it's overwritten, which is a common technique used by viruses and Trojan horse programs to take over your application. /GS works by reserving space on the stack before the return address. At the function entry, the function prolog fills in that spot with a security cookie XOR'd with the return address. That security cookie is computed as part of the module load so it's unique to each module. When the function exits, a special function, _security_check_cookie, checks to see whether the value stored at the special spot is the same as it was when entering the function. If the values are different, the code pops up a message box and terminates the program. If you want to see the security code in action, read the source files SECCINIT.C, SECCOOK.C, and SECFAIL.C in the C run-time source code. As if the security-checking capability of the /GS switch weren't enough, the switch is also a wonderful debugging aid. Even though the /RTCx switches will track numerous errors, a random write to the return address will still sneak through. With the /GS, you get that checking in your debug builds as well. Of course, the Redmondtonians were thinking of us when they wrote the /GS switch, so you can replace the default message box function with your own handler by calling _set_security_error_handler. If you do whack the stack, your handler should call ExitProcess after logging the error. 662

Distinct differences in formatting increase accep-

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Summary The debug C run-time library has many wonderful features provided you turn them on in your application. Because using memory is a fact of life in our C and C++ programs, we need all the help we can get solving the problems we invariably have with memory. This chapter covered the high points of the DCRT library and presented two utilities I wrote, MemDumperValidator and MemStress, that will help you get more information about the memory your application uses and allow you to better test your application under stressful conditions. The extensibility of the DCRT library is pretty amazing. If you've been in this business for more than a year or two, you've probably written something like it in the past. I hope I was able to give you some sense of the power of the DCRT library. I encourage you to devise other utilities and helper code that will ease your memory debugging chores. I also discussed the techniques and tools necessary to handle the nastiest of memory problems in production applications: uninitialized writes and memory overruns. Although the brute force approach might not seem elegant for solving those uninitialized writes, it's the only technique that actually gives you a chance. When it comes to memory overruns, the PageHeap tool accessible from AppVerifier, part of the Application Compatibility Toolkit, makes tracking them down easier. Although AppVerifier has some lumps, I'm sure Microsoft will continue to improve it in the future. Finally, the new Run-Time Error Checks and Buffer Security Check compiler switches are some of the most important advances we've had in compiler tools to help eradicate errors.

14. Read the Publish to path, which is displayed near the bottom of the Publish Your Presentation page, and verify that it is correct. If you want to make any changes, now is the time to click Back. 15. Click Finish. The two progress bars near the top and middle of the page display the current condition of the publishing process, and the Publish Wizard also displays the estimated time remaining until completion. 16. When the publishing process is complete, the Publish Wizard allows you to preview your presentation. Click Ye s in the window that asks, Would you like to view your published presentation Be sure to pay attention to the speed at which the presentation loads and plays from this point forward, since you might want to make changes based on the performance you observe. The introduction page for your presentation will open in a separate Internet Explorer window.

Never leave it to the observer to guess interdependencies and paths . In particular, bear this in mind if color-formatted charts are to be printed in monochrome . Because this often happens, it is important to remember this point . If necessary, indicate in your presentations and in any other data material that a continuous path will not necessarily continue in the same wave in the next unseen step; that is, either upwards or downwards . A rapidly increasing line at the end of a year can also sink dramatically again in January . In fact, this is the norm in some companies that are heavily dependent on the Christmas holiday trade .

When using data breakpoints, after you stop a debugging session, you probably want to clear any data breakpoints you've set Since I recommend using addresses for the data breakpoints, it's very probable that the memory location you want to watch will move around in subsequent runs This is especially true with the stack memory you're watching Better Data Breakpoints The new and improved data breakpoints are a wonderful improvement to Visual Studio NET native debugging However, if you've ever looked at the Intel Architecture Software Developer's Manuals, the documentation on the debug registers indicates that the registers can be set such that every read and read/write to the memory at the address specified can cause the hardware breakpoint to trigger The behavior of the Visual Studio NET data breakpoints is that they trigger only when the data changes in the address specified.

Summary

Figure 11.21 The presentation s introduction page displayed in Internet Explorer. Click Play to view your published presentation. When you have finished watching, close the Internet Explorer window. Then click Close to exit the Publish Wizard.

So if the value you're writing to a location doesn't change the data at that location, you'll never stop Occasionally, you do want to see who is writing or reading from a memory location no matter what I don't know how many times I've tracked down performance problems by counting how many times memory was touched Visual Studio NET hides part of the power of the hardware debug registers, but I figured there had to be a way to get the full power in the debugger As I was pondering the solution, I got an e-mail message from Mike Morearty indicating that he wanted the same thing and had set out to solve the problem Mike subsequently developed code that did exactly what I wanted, so there was no need for me even to think about the problem any more All you have to do is visit http://wwwmorearty.

I could cite other laws of perception here, but because these have only secondary importance for the purposes of this book I ll leave them out of our discussion . Now I will summarize the content of this chapter . Anyone who observes your chart, be it in a publication or as part of a presentation, is physiologically conditioned to recognize and interpret as quickly as possible the information being presented in the chart and its significance . If this does not happen reasonably quickly, both the observer s readiness to perceive and his or her acceptance of the information being presented diminish; that is, the person may quickly lose interest in your work or presentation . Anyone who wants to avoid this is well advised to consistently observe the central universal laws of human perception . In so doing, you should: