Re: [PATCH v3 1/2] ARM: mm: fix use-after-free in __do_user_fault() under CONFIG_DEBUG_USER

[Xie Yuanbin]

On Sat, 11 Jul 2026 09:05:03 +0100, Lorenzo Stoakes wrote:
> OK given arm32 can't do any of the stuff that makes kernel faults an issue, and
> if it's certain you can't deadlock on mmap write lock for VMA or non-VMA ranges
> on user fault, then no need for the mmap write trylock, and just take the mmap
> write lock unconditionally for user faults, and no lock for kernel faults I
> guess?

Yes, that's exactly what I think. We are waiting for ARM's maintainer Russell King
to confirm, and then we will send out the new patch. :)