Systems and Methods For Overriding Memory Access Permissions In A Virtual Machine
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United States of America Patent
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Jul 21, 2016
app pub date -
Jan 21, 2015
filing date -
Jan 21, 2015
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Abstract
Described systems and methods allow an instruction that violates memory access permissions within a virtual machine to execute natively (i.e., within the respective virtual machine), when such execution is deemed acceptable by security software executing at the level of the hypervisor. In some embodiments, the processor is endowed with a register having a set of control fields (e.g., control bits) that regulate permission overrides. Control fields may be accessible to software via a VM state object such as the VMCS on Intel® platforms.
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