20d384978b
In the function gicv2_set_spi_routing, the signed value proc_num is cast to unsigned int before being compared to other unsigned values in two assert calls. The value proc_num can be a negative value, and once the negative value is cast to unsigned it becomes a very large number which will trigger the assert. This patch changes the assert cast so that the unsigned values are cast to signed instead, keeping the same functionality but allowing proc_num to be negative. This bug can be seen when running the SDEI RM_ANY routing mode test in TFTF on the Juno platform. This patch also makes the usage of the proc_num variable in other gicv2 functions more clear. Signed-off-by: John Powell <john.powell@arm.com> Change-Id: If1b98eebb00bd9b73862e5e995e5e68c168170a6 |
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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.