Managing update attempts by a guest operating system to a host system or device
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United States of America Patent
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May 24, 2016
Grant Date -
Jul 16, 2015
app pub date -
Mar 27, 2015
filing date -
Sep 8, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
Attempts to update confirmation information or firmware for a hardware device can be monitored using a secure counter that is configured to monotonically adjust a current value of the secure counter for each update or update attempt. The value of the counter can be determined every time the validity of the firmware is confirmed, and this value can be stored to a secure location. At subsequent times, such as during a boot process, the actual value of the counter can be determined and compared with the expected value. If the values do not match, such that the firmware may be in an unexpected state, an action can be taken, such as to prevent access to, or isolate, the hardware until such time as the firmware can be validated or updated to an expected state.
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