Re: [PATCH V2] powerpc: Restore KUAP registers on syscall restart exit

[Madhavan Srinivasan]

On Mon, 15 Jun 2026 21:56:17 +0530, Mukesh Kumar Chaurasiya (IBM) wrote:
> During a syscall restart, block KUAP so that pending interrupts can be
> replayed. The original KUAP state is not restored before returning to
> userspace, causing subsequent userspace accesses to fault and eventually
> trigger bad_access_pkey(), crashing the kernel.
> 
> The original KUAP register values are already saved in
> arch_enter_from_user_mode(). Restore them on the syscall restart exit
> path before returning to userspace.
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc: Restore KUAP registers on syscall restart exit
      https://git.kernel.org/powerpc/c/4e1187e12de40b5301977b2476d21b569358dafb

cheers