[merged mm-stable] mm-vma-avoid-broken-uffd-merge-on-mremap.patch removed from -mm tree

[merged mm-stable] mm-vma-avoid-broken-uffd-merge-on-mremap.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/vma: avoid broken uffd merge on mremap
has been removed from the -mm tree.  Its filename was
     mm-vma-avoid-broken-uffd-merge-on-mremap.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: "Lorenzo Stoakes (ARM)" <ljs@kernel.org>
Subject: mm/vma: avoid broken uffd merge on mremap
Date: Tue, 20 Oct 2026 15:55:30 +0100

Userfaultfd often causes unexpected interactions within mm, and does so at
the intersection of uffd, mremap() and VMA merging.

When an mremap of a VMA occurs, copy_vma_and_data() calls
mremap_userfaultfd_prep() to notify uffd of this.

However, mremap_userfaultfd_prep() simply drops the UFFD context for the
VMA if the user did not register it for remap, i.e. didn't specify the
UFFD_FEATURE_EVENT_REMAP flag.

This is OK for the VMA itself, as upon page table move, move_ptes() clears
UFFD page table flags, using vma_has_uffd_without_event_remap() to
determine whether to do so.

However, this doesn't account for merging with adjacent VMAs, whose page
tables won't have received this treatment, and thus latent UFFD markers
will be left around.

Worse, it'll break UFFD for any VMAs it is merged with. This is very
surprising behaviour for a user, who will then simply not receive UFFD
events for VMAs they ought to.

Resolve the issue by explicitly checking for this case via
vma_has_uffd_without_event_remap() in vma_merge_copied_range(), the merge
function explicitly designated for mremap() operations.

Also update the userland VMA tests accordingly.

Link: https://lore.kernel.org/20261020-uffd-remap-fix-v1-1-0f34fc181f0a@kernel.org
Fixes: 3cfd22be0ad6 ("userfaultfd: clear flag if remap event not enabled")
Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reported-by: shaos <shawnq1@163.com>
Closes: https://lore.kernel.org/all/20261020110748.959870-1-shawnq1@163.com/
Reviewed-by: Kiryl Shutsemau (Meta) <kas@kernel.org>
Reviewed-by: Gregory Price (Meta) <gourry@gourry.net>
Reviewed-by: Xueyuan Chen <xueyuan.chen21@gmail.com>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Jann Horn <jannh@google.com>
Cc: Pedro Falcato <pfalcato@suse.de>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: <stable@vger.kernel.org>
---

 mm/vma.c                          |    5 +++++
 tools/testing/vma/include/stubs.h |    5 +++++
 2 files changed, 10 insertions(+)

--- a/mm/vma.c~mm-vma-avoid-broken-uffd-merge-on-mremap
+++ a/mm/vma.c
@@ -1211,6 +1211,11 @@ static struct vm_area_struct *vma_merge_
 
 	vmg->copied_from = vmg->middle;
 	vmg->middle = NULL;
+
+	/* If not registered for remap, uffd context will be cleared. */
+	if (vma_has_uffd_without_event_remap(vmg->copied_from))
+		return NULL;
+
 	return vma_merge_new_range(vmg);
 }
 
--- a/tools/testing/vma/include/stubs.h~mm-vma-avoid-broken-uffd-merge-on-mremap
+++ a/tools/testing/vma/include/stubs.h
@@ -386,6 +386,11 @@ static inline bool is_mergeable_vm_userf
 	return true;
 }
 
+static inline bool vma_has_uffd_without_event_remap(struct vm_area_struct *vma)
+{
+	return false;
+}
+
 static inline bool anon_vma_name_eq(struct anon_vma_name *anon_name1,
 				    struct anon_vma_name *anon_name2)
 {
_

Patches currently in -mm which might be from ljs@kernel.org are

mm-vma-fix-expansion-of-vma_mixedmap_bit-vmas.patch
mm-do-not-unintentionally-overwrite-atomic-vma-flags.patch
mm-vma-avoid-losing-atomic-vma-flags-when-setting-sticky-vma-flags.patch