3d6cc21066
Reword the description of threat #9 to make it more future-proof for Arm CCA. By avoiding specific references to secure or non-secure contexts, in favour of "worlds" and "security contexts", we make the description equally applicable to 2-world and 4-world architectures. Note that there are other threats that would benefit from such a similar revamp but this is out of scope of this patch. Also list malicious secure world code as a potential threat agent. This seems to be an oversight in the first version of the threat model (i.e. this change is not related to Arm CCA). Change-Id: Id8c8424b0a801104c4f3dc70e344ee702d2b259a Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com> |
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readme.rst
Trusted Firmware-A
Trusted Firmware-A (TF-A) is a reference implementation of secure world software for Arm A-Profile architectures (Armv8-A and Armv7-A), including an Exception Level 3 (EL3) Secure Monitor. It provides a suitable starting point for productization of secure world boot and runtime firmware, in either the AArch32 or AArch64 execution states.
TF-A implements Arm interface standards, including:
- Power State Coordination Interface (PSCI)
- Trusted Board Boot Requirements CLIENT (TBBR-CLIENT)
- SMC Calling Convention
- System Control and Management Interface (SCMI)
- Software Delegated Exception Interface (SDEI)
The code is designed to be portable and reusable across hardware platforms and software models that are based on the Armv8-A and Armv7-A architectures.
In collaboration with interested parties, we will continue to enhance TF-A with reference implementations of Arm standards to benefit developers working with Armv7-A and Armv8-A TrustZone technology.
Users are encouraged to do their own security validation, including penetration testing, on any secure world code derived from TF-A.
More Info and Documentation
To find out more about Trusted Firmware-A, please view the full documentation that is available through trustedfirmware.org.
Copyright (c) 2013-2019, Arm Limited and Contributors. All rights reserved.