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4.2.2 Protection of Immutable Code

NIST platform security: roots of trust, firmware and secure enclaves SP 800-193
All changes in this version
first version loaded 4 Firmware Security Guidelines for Platform Devices part of 4.2

Title

Protection of Immutable Code

Control

Code could be stored in field non-upgradable memory, such as Read Only Memory (ROM). While the protections for this type of storage are strong, the trade-off is the inability to update the code to fix bugs and patch vulnerabilities. Manufacturers of systems and devices should carefully weigh the advantages and disadvantages of using nonvolatile storage that is not field upgradable.

1) If used, the write protection of field non-upgradable memory shall not be modifiable.