Category Archives: Notícias

Building a better computer bug finder: Researchers improve the process of finding vulnerabilities by intentionally adding swarms of bugs to source code

Detecting bugs in computer programs is an expensive task, and there is no way of measuring their efficacy without knowing exactly how many go unnoticed. To tackle this problem, researchers have created LAVA (Large-Scale Automated Vulnerability Addition), a cost-effective technique of intentionally adding vulnerabilities to a program’s source code to test the limits of bug-finding tools and ultimately help developers improve them.

Source: Building a better computer bug finder: Researchers improve the process of finding vulnerabilities by intentionally adding swarms of bugs to source code

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An Emulator Writer’s HOWTO for Static Binary Translation

This is a very interesting article that I found at: http://www.gtoal.com/sbt/. This is a practical article showing to to craft a simple static binary translator and emulator.

There is a lot of Computer Science literature on binary translation, both of the sexy dynamic variety and the slightly duller (from the CS point of view) static variety. However most of what you’ll find when you research the subject is rather dry and somewhat academic. I don’t know of any accessible primers on static translation that someone from the emulation world can pick up and use in a practical project.
So… the aim of this HOWTO document is to give you a very practical method that you can adapt to your own area of expertise, which should pretty much guarantee that if you have already written or worked on a reasonable emulator, you will be able to write a translator which will take a specific program and generate a binary from it that runs on a different architecture, and does so faster than any emulator that you’re used to using.

And that’s why we’re doing this: you have a favorite old video game that you want to run on some system and the emulator for that system works but it just isn’t fast enough. Or perhaps you want to port an emulator which works OK on a 300MHz Pentium to a 16MHz ARM in your PDA. A straight port runs your favourite game at 2FPS and you don’t think the hardware is likely to get 25 times faster in the near future! Play your cards right and you may get that factor of 25 out of a static binary translator.

This document tries to explain things simply – perhaps too simply at times, and there are a lot of examples which differ from the previous example in small details. This makes the document rather long, but that’s deliberate; I don’t want to skip too many stages and risk having anyone lose track of the process. Apologies in advance to those of you who think I’m taking it too slowly or have made this document too long.

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