On Wednesday, November 07, 2012 09:54:03 PM Matthew Garrett wrote: > Is there a case where modifying MSRs or EC registers can cause arbitrary > code execution? Ok, I am not familiar enough with this secure stuff. Theoretically writing EC registers could be used to trick ACPI code and change the way it is processed by inspecting ACPI code for bad EC register return values. Similar for MSR, the kernel could be (not directly) influenced by setting MSR registers in a way it does not expect them to be. I expect it's easy to get the system totally stalled/hang/rebooted with bad MSR writes which I thought should be forbidden for userspace (even for root...) in secure boot mode. Thomas -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
