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| From: | Sebastian Herbszt |
| Subject: | Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios |
| Date: | Sun, 22 Nov 2009 22:15:59 +0100 |
Kevin O'Connor wrote:
On Sun, Nov 22, 2009 at 04:31:24PM +0100, Sebastian Herbszt wrote: > Bad things could happen if someone modifies the BIOS because it's unprotected > (e.g. VM crash).I'm not sure why modification of the BIOS would cause a VM crash. If this is true, then a malicious guest could unlock the ram and write to it for the same effect.
On Linux only root can unlock the memory. If the memory is unlocked and a user manages to overwrite the BIOS, the VM will crash on next "reboot" or system_reset. If the OS is using the BIOS interfaces more often, e.g. INT 13h, bad things could happen earlier. - Sebastian
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