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Arm FF-A fixes for v7.1

Browse source 
The updates fix several robustness issues in the FF-A bus and core driver,
 mostly around notification handling, RxTx buffer sizing, firmware-provided
 bounds, and cleanup paths.
 
 The notification fixes make per-CPU notification work truly per-CPU, avoid
 running per-vCPU notification handling from IPI context, keep RX buffer
 release serialized under rx_lock, validate framework notification payload
 layout before copying from the shared RX buffer, and avoid dereferencing
 notifier entries after they may have been unregistered.
 
 The remaining fixes reject FF-A drivers without an ID table at registration
 time, avoid freeing an unallocated RX buffer after allocation failure,
 unregister the FF-A v1.0 bus notifier on teardown, bound register-based
 PARTITION_INFO_GET descriptor copies, align the stored RxTx buffer size with
 the size mapped to firmware, and fix sched-recv callback partition lookup on
 the circular partition list.
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Merge tag 'ffa-fixes-7.1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux into arm/fixes

Arm FF-A fixes for v7.1

The updates fix several robustness issues in the FF-A bus and core driver,
mostly around notification handling, RxTx buffer sizing, firmware-provided
bounds, and cleanup paths.

The notification fixes make per-CPU notification work truly per-CPU, avoid
running per-vCPU notification handling from IPI context, keep RX buffer
release serialized under rx_lock, validate framework notification payload
layout before copying from the shared RX buffer, and avoid dereferencing
notifier entries after they may have been unregistered.

The remaining fixes reject FF-A drivers without an ID table at registration
time, avoid freeing an unallocated RX buffer after allocation failure,
unregister the FF-A v1.0 bus notifier on teardown, bound register-based
PARTITION_INFO_GET descriptor copies, align the stored RxTx buffer size with
the size mapped to firmware, and fix sched-recv callback partition lookup on
the circular partition list.

* tag 'ffa-fixes-7.1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux:
  firmware: arm_ffa: Fix sched-recv callback partition lookup
  firmware: arm_ffa: Snapshot notifier callbacks under lock
  firmware: arm_ffa: Align RxTx buffer size before mapping
  firmware: arm_ffa: Validate framework notification message layout
  firmware: arm_ffa: Keep framework RX release under lock
  firmware: arm_ffa: Bound PARTITION_INFO_GET_REGS copies
  firmware: arm_ffa: Unregister bus notifier on teardown for FF-A v1.0
  firmware: arm_ffa: Fix per-vcpu self notifications handling in workqueue
  firmware: arm_ffa: Avoid collapsing NPI work from different CPUs
  firmware: arm_ffa: Skip free_pages on RX buffer alloc failure
  firmware: arm_ffa: Check for NULL FF-A ID table while driver registration

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2026-05-07 14:06:53 +02:00
commit d1f29ea139
2 changed files with 104 additions and 44 deletions
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