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review.trustedfirmware.org / sandbox / arthur / hafnium / e89c793ac103f8fec9d40001f6383e3e450c00a6
commite89c793ac103f8fec9d40001f6383e3e450c00a6[log] [tgz]
authorJ-Alves <joao.alves@arm.com>Thu Oct 02 11:29:02 2025 +0100
committerJoao Alves <joao.alves@arm.com>Thu Oct 02 13:10:41 2025 +0000
tree5463750a1e392bb554a09537fef5f9e75e1464ac
parent305bfe7a752a0cadb31bb21f790f7094dd34e0c6 [diff]
fix(ffa_memory): avoid changing receiver's permissions

The memory region descriptor sent by the sender of a memory
sharing operation is cached inside Hafnium's internal state
structures.

The receiver's access permissions entry was getting updated
with those submitted after a successful retrieve request.

This is not necessary as per the current state of the
implementation, and it interferes with the return of
FFA_NS_RES_INFO_GET.

Signed-off-by: J-Alves <joao.alves@arm.com>
Change-Id: I38c186508d2f3d238c491c411d42ccd7f837dbc9
1 file changed
tree: 5463750a1e392bb554a09537fef5f9e75e1464ac
  1. .vscode/
  2. build/
  3. docs/
  4. inc/
  5. kokoro/
  6. project/
  7. src/
  8. test/
  9. third_party/
  10. tools/
  11. vmlib/
  12. prebuilts
  13. .clang-format
  14. .clang-tidy
  15. .gitignore
  16. .gitmodules
  17. .gn
  18. .readthedocs.yaml
  19. AUTHORS
  20. BUILD.gn
  21. commitlint.config.js
  22. CONTRIBUTING.md
  23. dco.txt
  24. LICENSE
  25. Makefile
  26. navbar.md
  27. package-lock.json
  28. package.json
  29. pyproject.toml
  30. README.md
README.md

Hafnium

Hafnium is the Secure Partition Manager(SPM) reference implementation, following the Arm's Firmware Framework specification.

It leverages Arm's virtualization extensions in the secure world of Arm's A class of devices (feature introduced with Armv8.4 FEAT_SEL2) to allow multiple Trusted OSes or Applications to run concurrently, inside the Trusted Execution Environment, each running as a Secure Partition (SP). Its main goal is to control the system access given to Trusted OSes, and serve as a mediator to the rest of the system.

For example, it limits the memory use, and handles all system calls from Trusted OS. Thus the SPM can enforce spacial isolation, and enforce some level of access control, protecting other critical system resources such as: the secure monitor, the normal world software stack, the SPM itself and other SPs/Trusted Applications. Other important features are: secure interrupt handling, device assignment, inter-partition communication and with the Normal World Software stack, also known as Rich Execution Environment (REE).

The following diagram shows an overview of a typical aarch64-based system, and where Hafnium fits:

Hafnium Architecture

Get in touch and keep up-to-date at:

See feature requests and bugs through github.

Documentation

To find more about Hafnium, view the full documentation. It includes valuable resources such as: Getting Started guide, Threat Model, and other documentation.