On Mon, May 25, 2026 at 01:19:22PM +0000, [email protected] wrote:
> Thank you for your contribution! Sashiko AI review found 1 potential issue(s)
> to consider:
> - [High] GUP enters an infinite loop when using FOLL_FORCE on an
> inaccessible (PROT_NONE) VMA that has VM_UFFD_RWP enabled.
Confirmed. RWP resolution restores vm_page_prot, which is PAGE_NONE on
a PROT_NONE VMA -- the page never becomes accessible and FOLL_FORCE
loops. Will fix in v5 by rejecting the registration up front in
vma_can_userfault():
+ if ((vm_flags & VM_UFFD_RWP) && !vma_is_accessible(vma))
+ return false;
> --
> Sashiko AI review ยท
> https://sashiko.dev/#/patchset/[email protected]?part=7
--
Kiryl Shutsemau / Kirill A. Shutemov
