Hi all,
This series fixes the Endpoint Memory Access Descriptor (EMAD) offset calculations and adds the necessary bounds checks for both the core FF-A driver and the pKVM hypervisor.
Prior to FF-A version 1.1, the memory region header didn't specify an explicit offset for the EMADs, leading to the assumption that they immediately follow the header. However, from v1.1 onwards, the specification dictates using the ep_mem_offset` field to determine the start of the memory access array.
The patches in this series address this by: 1. Updating the core `arm_ffa` firmware driver to correctly calculate the descriptor offset using `ep_mem_offset` rather than defaulting to `sizeof(struct ffa_mem_region)`. It also introduces bounds checking against `max_fragsize`. 2. Enhancing the pKVM hypervisor validation logic to no longer strictly enforce that the descriptor strictly follows the header, aligning it with the driver behavior and the FF-A specification, while also ensuring the offset falls within the mailbox buffer bounds.
While addressing these bugs, Sashiko uncovered other issues that were fixed in the same series.
Changelog ######### v4->v5: - Collect Sudeep Rbs - Add extra patch to check base address alignment. - Remove WARN_ONs in KVM code - Use ffa_emad_size_get() instead of hardcoded size in KVM code.
v3 -> v4: - Address review comments and fix Sashiko bugs
v2 -> v3: - Fixed typo in nvhe/ffa.c (missing sizeof)
v1 -> v2: - For pKVM, removed the strict placement enforcement for `ep_mem_offset` as it is not compliant with the spec, and avoids making assumptions about the driver's memory layout.
Link to: ######## v4: https://lore.kernel.org/all/20260520204948.2440882-1-smostafa@google.com/ v3: https://lore.kernel.org/all/20260512124442.1899107-1-sebastianene@google.com... v2: https://lore.kernel.org/all/20260430160241.1934777-1-sebastianene@google.com... v1: https://lore.kernel.org/all/ae9KN9nkOgDYJcGP@google.com/T/#t
Mostafa Saleh (4): optee: ffa: Add NULL check in optee_ffa_lend_protmem firmware: arm_ffa: Fix out-of-bound writes in ffa_setup_and_transmit() KVM: arm64: Fix bounds checking in do_ffa_mem_reclaim() KVM: arm64: Ensure FFA ranges are page aligned
Sebastian Ene (2): firmware: arm_ffa: Fix Endpoint Memory Access Descriptor offset calculation KVM: arm64: Validate the offset to the mem access descriptor
arch/arm64/kvm/hyp/nvhe/ffa.c | 38 ++++++++++++++++++++++--------- drivers/firmware/arm_ffa/driver.c | 21 ++++++++++------- drivers/tee/optee/ffa_abi.c | 3 +++ include/linux/arm_ffa.h | 2 +- 4 files changed, 44 insertions(+), 20 deletions(-)