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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 5/30/26 03:23, Kiryl Shutsemau (Meta) wrote: > change_non_present_huge_pmd() rewrites a writable device-private PMD > swap entry into a readable one without carrying pmd_swp_uffd_wp() > across. The PTE-level change_softleaf_pte() does this correctly; > mirror that here, matching what copy_huge_pmd() does for the fork > path. Without the carry, a plain mprotect() over a UFFD_WP-marked > device-private THP strips the bit and the trap is bypassed on > swap-in. > > Fixes: 368076f52ebe ("mm/huge_memory: add device-private THP support to PMD operations") > Cc: stable@vger.kernel.org > Reported-by: Sashiko AI review > Signed-off-by: Kiryl Shutsemau > --- > mm/huge_memory.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/mm/huge_memory.c b/mm/huge_memory.c > index 42b86e8ab7c0..b7c895b1d366 100644 > --- a/mm/huge_memory.c > +++ b/mm/huge_memory.c > @@ -2663,6 +2663,8 @@ static void change_non_present_huge_pmd(struct mm_struct *mm, > } else if (softleaf_is_device_private_write(entry)) { > entry = make_readable_device_private_entry(swp_offset(entry)); > newpmd = swp_entry_to_pmd(entry); > + if (pmd_swp_uffd_wp(*pmd)) > + newpmd = pmd_swp_mkuffd_wp(newpmd); > } else { > newpmd = *pmd; > } Reviewed-by: Balbir Singh Balbir