[merged mm-hotfixes-stable] mm-mseal-update-vma-end-correctly-on-merge.patch removed from -mm tree

[merged mm-hotfixes-stable] mm-mseal-update-vma-end-correctly-on-merge.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/mseal: update VMA end correctly on merge
has been removed from the -mm tree.  Its filename was
     mm-mseal-update-vma-end-correctly-on-merge.patch

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

------------------------------------------------------
From: "Lorenzo Stoakes (Oracle)" <ljs@kernel.org>
Subject: mm/mseal: update VMA end correctly on merge
Date: Fri, 27 Mar 2026 17:31:04 +0000

Previously we stored the end of the current VMA in curr_end, and then upon
iterating to the next VMA updated curr_start to curr_end to advance to the
next VMA.

However, this doesn't take into account the fact that a VMA might be
updated due to a merge by vma_modify_flags(), which can result in curr_end
being stale and thus, upon setting curr_start to curr_end, ending up with
an incorrect curr_start on the next iteration.

Resolve the issue by setting curr_end to vma->vm_end unconditionally to
ensure this value remains updated should this occur.

While we're here, eliminate this entire class of bug by simply setting
const curr_[start/end] to be clamped to the input range and VMAs, which
also happens to simplify the logic.

Link: https://lkml.kernel.org/r/20260327173104.322405-1-ljs@kernel.org
Fixes: 6c2da14ae1e0 ("mm/mseal: rework mseal apply logic")
Signed-off-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Reported-by: Antonius <antonius@bluedragonsec.com>
Closes: https://lore.kernel.org/linux-mm/CAK8a0jwWGj9-SgFk0yKFh7i8jMkwKm5b0ao9=kmXWjO54veX2g@mail.gmail.com/
Suggested-by: David Hildenbrand (ARM) <david@kernel.org>
Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Reviewed-by: Pedro Falcato <pfalcato@suse.de>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Jann Horn <jannh@google.com>
Cc: Jeff Xu <jeffxu@chromium.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/mseal.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/mm/mseal.c~mm-mseal-update-vma-end-correctly-on-merge
+++ a/mm/mseal.c
@@ -56,7 +56,6 @@ static int mseal_apply(struct mm_struct
 		unsigned long start, unsigned long end)
 {
 	struct vm_area_struct *vma, *prev;
-	unsigned long curr_start = start;
 	VMA_ITERATOR(vmi, mm, start);
 
 	/* We know there are no gaps so this will be non-NULL. */
@@ -66,6 +65,7 @@ static int mseal_apply(struct mm_struct
 		prev = vma;
 
 	for_each_vma_range(vmi, vma, end) {
+		const unsigned long curr_start = MAX(vma->vm_start, start);
 		const unsigned long curr_end = MIN(vma->vm_end, end);
 
 		if (!(vma->vm_flags & VM_SEALED)) {
@@ -79,7 +79,6 @@ static int mseal_apply(struct mm_struct
 		}
 
 		prev = vma;
-		curr_start = curr_end;
 	}
 
 	return 0;
_

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

mm-rename-vma-flag-helpers-to-be-more-readable.patch
mm-add-vma_desc_test_all-and-use-it.patch
mm-always-inline-__mk_vma_flags-and-invoked-functions.patch
mm-reintroduce-vma_flags_test-as-a-singular-flag-test.patch
mm-reintroduce-vma_desc_test-as-a-singular-flag-test.patch
tools-testing-vma-add-test-for-vma_flags_test-vma_desc_test.patch
mm-mremap-correct-invalid-map-count-check.patch
mm-abstract-reading-sysctl_max_map_count-and-read_once.patch
mm-mremap-check-map-count-under-mmap-write-lock-and-abstract.patch
mm-vma-add-vma_flags_empty-vma_flags_and-vma_flags_diff_pair.patch
tools-testing-vma-add-unit-tests-flag-empty-diff_pair-and.patch
mm-vma-add-further-vma_flags_t-unions.patch
tools-testing-vma-convert-bulk-of-test-code-to-vma_flags_t.patch
mm-vma-use-new-vma-flags-for-sticky-flags-logic.patch
tools-testing-vma-fix-vma-flag-tests.patch
mm-vma-add-append_vma_flags-helper.patch
tools-testing-vma-add-simple-test-for-append_vma_flags.patch
mm-unexport-vm_brk_flags-and-eliminate-vm_flags-parameter.patch
mm-vma-introduce-vma_flags_same.patch
mm-vma-introduce-_to_-helpers.patch
tools-testing-vma-test-that-legacy-flag-helpers-work-correctly.patch
mm-vma-introduce-vma_test-and-make-inlining-consistent.patch
tools-testing-vma-update-vma-flag-tests-to-test-vma_test.patch
mm-introduce-vma_flags_count-and-vma_test_single_mask.patch
tools-testing-vma-test-vma_flags_countvma_test_single_mask.patch
mm-convert-do_brk_flags-to-use-vma_flags_t.patch
mm-update-vma_supports_mlock-to-use-new-vma-flags.patch
mm-vma-introduce-vma_clear_flags.patch
tools-testing-vma-update-vma-tests-to-test-vma_clear_flags.patch
mm-vma-convert-as-much-as-we-can-in-mm-vmac-to-vma_flags_t.patch
tools-bitmap-add-missing-bitmap_copy-implementation.patch
mm-vma-convert-vma_modify_flags-to-use-vma_flags_t.patch
mm-vma-convert-__mmap_region-to-use-vma_flags_t.patch
mm-simplify-vma-flag-tests-of-excluded-flags.patch
mm-various-small-mmap_prepare-cleanups.patch
mm-add-documentation-for-the-mmap_prepare-file-operation-callback.patch
mm-document-vm_operations_struct-open-the-same-as-close.patch
mm-avoid-deadlock-when-holding-rmap-on-mmap_prepare-error.patch
mm-switch-the-rmap-lock-held-option-off-in-compat-layer.patch
mm-vma-remove-superfluous-map-hold_file_rmap_lock.patch
mm-have-mmap_action_complete-handle-the-rmap-lock-and-unmap.patch
mm-add-vm_ops-mapped-hook.patch
fs-afs-revert-mmap_prepare-change.patch
fs-afs-restore-mmap_prepare-implementation.patch
mm-add-mmap_action_simple_ioremap.patch
misc-open-dice-replace-deprecated-mmap-hook-with-mmap_prepare.patch
hpet-replace-deprecated-mmap-hook-with-mmap_prepare.patch
mtdchar-replace-deprecated-mmap-hook-with-mmap_prepare-clean-up.patch
stm-replace-deprecated-mmap-hook-with-mmap_prepare.patch
staging-vme_user-replace-deprecated-mmap-hook-with-mmap_prepare.patch
mm-allow-handling-of-stacked-mmap_prepare-hooks-in-more-drivers.patch
drivers-hv-vmbus-replace-deprecated-mmap-hook-with-mmap_prepare.patch
uio-replace-deprecated-mmap-hook-with-mmap_prepare-in-uio_info.patch
mm-add-mmap_action_map_kernel_pages.patch
mm-on-remap-assert-that-input-range-within-the-proposed-vma.patch
mm-huge_memory-simplify-vma_is_specal_huge.patch
mm-huge-avoid-big-else-branch-in-zap_huge_pmd.patch
mm-huge_memory-have-zap_huge_pmd-return-a-boolean-add-kdoc.patch
mm-huge_memory-handle-buggy-pmd-entry-in-zap_huge_pmd.patch
mm-huge_memory-add-a-common-exit-path-to-zap_huge_pmd.patch
mm-huge_memory-remove-unnecessary-vm_bug_on_page.patch
mm-huge_memory-deduplicate-zap-deposited-table-call.patch
mm-huge_memory-remove-unnecessary-sanity-checks.patch
mm-huge_memory-use-mm-instead-of-tlb-mm.patch
mm-huge_memory-separate-out-the-folio-part-of-zap_huge_pmd.patch
mm-add-softleaf_is_valid_pmd_entry-pmd_to_softleaf_folio.patch
mm-huge_memory-add-and-use-normal_or_softleaf_folio_pmd.patch
mm-huge_memory-add-and-use-normal_or_softleaf_folio_pmd-fix.patch
mm-huge_memory-add-and-use-has_deposited_pgtable.patch
mm-huge_memory-add-and-use-has_deposited_pgtable-fix.patch
maintainers-update-mglru-entry-to-reflect-current-status.patch