Preventing code modification after boot
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United States of America Patent
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Jan 23, 2018
Grant Date -
Dec 24, 2015
app pub date -
Jun 20, 2014
filing date -
Jun 20, 2014
priority date (Note) -
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Abstract
The subject disclosure is directed towards protecting code in memory from being modified after boot, such as code used in a dedicated microprocessor or microcontroller. Hardware, such as in logic or in a memory protection unit, allows a range of memory to be made non-writeable after being loaded, e.g., via a secure boot load operation. Further, startup code that is used to configure the hardware/memory may be made non-executable after having run once, so that no further execution may occur in that space, e.g., as a result of an attack. A function in the runtime code may allow for a limited, attack-protected reconfiguration of sub-regions of memory regions during the runtime execution.
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