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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Sun Oct 25, 2026 at 6:32 PM EDT, Hungyu Lin wrote: > When move_pages() is used with nodes =3D=3D NULL, do_pages_stat_array() > passes each page address directly to vma_lookup(). A valid tagged address > therefore fails the VMA lookup and gets -EFAULT in its status entry, > instead of the node reported for the corresponding untagged address. > > The tagged address ABI permits these pointers, and the migration path > already removes their tags. Apply the target mm's untagging rules to > the query path as well, while holding its mmap read lock. > > Fixes: 057d3389108e ("mm: untag user pointers passed to memory syscalls") > Reported-by: Sashiko > Link: https://lore.kernel.org/r/20260721183257.706661F000E9@smtp.kernel.o= rg It should be "Closes:" > Cc: stable@vger.kernel.org > Signed-off-by: Hungyu Lin > --- > mm/migrate.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/mm/migrate.c b/mm/migrate.c > index 7e3a81f06974..994c78782a54 100644 > --- a/mm/migrate.c > +++ b/mm/migrate.c > @@ -2461,7 +2461,7 @@ static void do_pages_stat_array(struct mm_struct *m= m, unsigned long nr_pages, > mmap_read_lock(mm); > =20 > for (i =3D 0; i < nr_pages; i++) { > - unsigned long addr =3D (unsigned long)(*pages); > + unsigned long addr =3D (unsigned long)untagged_addr_remote(mm, *pages)= ; > struct vm_area_struct *vma; > struct folio_walk fw; > struct folio *folio; LGTM. add_folio_for_migration() does the same thing for user pointer p. Acked-by: Zi Yan --=20 Best Regards, Yan, Zi