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armv8.1-m: Add task dedicated PAC key

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To harden the security, each task is assigned
a dedicated PAC key, so that attackers needs
to guess the all the tasks' PAC keys right to
exploit the system using Return Oriented Programming.

The kernel is now updated to support the following:
* A PAC key set with a random number generated and
is pushed onto the task's stack when a task is created.

* As part of scheduling, the task's PAC key is stacked/unstacked
to/from the task's stack when a task is unscheduled/scheduled
from/to run.

Signed-off-by: Ahmed Ismail <Ahmed.Ismail@arm.com>
This commit is contained in:
Ahmed Ismail 2024-10-29 13:28:16 +00:00
parent c84fc7226e
commit 029545f4ad
63 changed files with 4247 additions and 1292 deletions
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2
.github/.cSpellWords.txt vendored
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@ -106,6 +106,7 @@ CLKSOURCE
CLKSTA
CLRB
CLRF
clrm
CLRPSW
CMCNT
CMCON
@ -678,6 +679,7 @@ pylint
pytest
pyyaml
RAMPZ
randomisation
RASR
Rationalised
Raynald