[原文]An error in the Toshiba ACPI BIOS 1.6 causes the BIOS to only examine the first slot in the Master Boot Record (MBR) table for an active partition, which prevents the system from booting even though the MBR is not malformed. NOTE: it has been debated as to whether or not this issue poses a security vulnerability, since administrative privileges would be required, and other DoS attacks are possible with such privileges.
Toshiba ACPI BIOS contains a flaw that may allow a local denial of service. The issue is due to an error, which causes the BIOS to only check the first slot in the MBR table for a bootable partition. It is possible for a malicious user to arbitrary specify a different slot in the MBR table, which prevents the system from booting resulting in a loss of availability.
Currently, there are no known upgrades or patches to correct this issue. It is possible to correct the flaw by implementing the following workaround: prevent unauthorized physical access to the machine.