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Hidden Debug Mode in AMD Processors
- JoachimSchipper 16y agoThe linked article has been slashdotted, but does anyone know if the security implications are as horrible as I think they are? (Crossing process-kernel boundaries, crossing VM boundaries, ...)
- agl 16y agoI haven't been able to read the article either but, from teasing apart the /. comments, it appears that they are extensions to the normal debugging support and aren't an immediate cause for concern. (If it's just a way to trigger a breakpoint based on the contents of a write, then that's only a subset of the documented capability.)
- tptacek 16y agoAlmost certainly not; the features are modeled after the DRx hardware debug registers. You can't access them from userland, and the debug registers are already virtualized.
- mfukar 16y agoProbably not, although I couldn't tell for sure at this moment. It's certainly a lot cooler debugging feature in relation to Intel chips.
- JoachimSchipper 16y agoAlso see http://news.ycombinator.com/item?id=1897583 http://news.ycombinator.com/item?id=1897583.
- danielson 16y agoFrench security blog w/ a copy of the text: http://www.secuobs.com/revue/news/264198.shtml http://www.secuobs.com/revue/news/264198.shtml Incomplete?
- swolchok 16y agoCached version, via Slashdot: http://webcache.googleusercontent.com/search?q=cache:EzsEFcoAZDAJ:www.woodmann.com/forum/archive/index.php/t-13891.html+amd+hardware+debugging+features&hl=en&gl=uk&strip=1 http://webcache.googleusercontent.com/search?q=cache:EzsEFco... Make sure you choose "text-only version" in the upper-right. Looks like it's just hardware conditional breakpoints, nothing to see here...
- danielson 16y agoMuch better.