[PATCH v2 1/2] mm: prevent droppable mappings from being locked

[Anthony Yznaga <anthony.yznaga@oracle.com>]

Droppable mappings must not be lockable. There is a check for VMAs with
VM_DROPPABLE set in mlock_fixup() along with checks for other types of
unlockable VMAs which ensures this when calling mlock()/mlock2().

For mlockall(MCL_FUTURE), the check for unlockable VMAs is different.
In apply_mlockall_flags(), if the flags parameter has MCL_FUTURE set, the
current task's mm's default VMA flag field mm->def_flags has VM_LOCKED
applied to it. VM_LOCKONFAULT is also applied if MCL_ONFAULT is also set.
When these flags are set as default in this manner they are cleared in
__mmap_complete() for new mappings that do not support mlock. A check for
VM_DROPPABLE in __mmap_complete() is missing resulting in droppable
mappings created with VM_LOCKED set. To fix this and reduce that chance of
similar bugs in the future, introduce and use vma_supports_mlock().

Fixes: 9651fcedf7b9 ("mm: add MAP_DROPPABLE for designating always lazily freeable mappings")
Suggested-by: David Hildenbrand <david@kernel.org>
Signed-off-by: Anthony Yznaga <anthony.yznaga@oracle.com>
---
v2:
 - Implement vma_supports_mlock() instead of vma flags mask (DavidH)
 - Add selftests (Lorenzo)

 include/linux/hugetlb_inline.h    |  2 +-
 mm/internal.h                     | 10 ++++++++++
 mm/mlock.c                        | 10 ++++++----
 mm/vma.c                          |  4 +---
 tools/testing/vma/include/stubs.h |  5 +++++
 5 files changed, 23 insertions(+), 8 deletions(-)

diff --git a/include/linux/hugetlb_inline.h b/include/linux/hugetlb_inline.h
index 593f5d4e108b..755281fab23d 100644
--- a/include/linux/hugetlb_inline.h
+++ b/include/linux/hugetlb_inline.h
@@ -30,7 +30,7 @@ static inline bool is_vma_hugetlb_flags(const vma_flags_t *flags)
 
 #endif
 
-static inline bool is_vm_hugetlb_page(struct vm_area_struct *vma)
+static inline bool is_vm_hugetlb_page(const struct vm_area_struct *vma)
 {
 	return is_vm_hugetlb_flags(vma->vm_flags);
 }
diff --git a/mm/internal.h b/mm/internal.h
index cb0af847d7d9..8c67637abcdd 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -1218,6 +1218,16 @@ static inline struct file *maybe_unlock_mmap_for_io(struct vm_fault *vmf,
 	}
 	return fpin;
 }
+
+static inline bool vma_supports_mlock(const struct vm_area_struct *vma)
+{
+	if (vma->vm_flags & (VM_SPECIAL | VM_DROPPABLE))
+		return false;
+	if (vma_is_dax(vma) || is_vm_hugetlb_page(vma))
+		return false;
+	return vma != get_gate_vma(current->mm);
+}
+
 #else /* !CONFIG_MMU */
 static inline void unmap_mapping_folio(struct folio *folio) { }
 static inline void mlock_new_folio(struct folio *folio) { }
diff --git a/mm/mlock.c b/mm/mlock.c
index 2f699c3497a5..73551c71cebf 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -472,10 +472,12 @@ static int mlock_fixup(struct vma_iterator *vmi, struct vm_area_struct *vma,
 	int ret = 0;
 	vm_flags_t oldflags = vma->vm_flags;
 
-	if (newflags == oldflags || (oldflags & VM_SPECIAL) ||
-	    is_vm_hugetlb_page(vma) || vma == get_gate_vma(current->mm) ||
-	    vma_is_dax(vma) || vma_is_secretmem(vma) || (oldflags & VM_DROPPABLE))
-		/* don't set VM_LOCKED or VM_LOCKONFAULT and don't count */
+	if (newflags == oldflags || vma_is_secretmem(vma) ||
+	    !vma_supports_mlock(vma))
+		/*
+		 * Don't set VM_LOCKED or VM_LOCKONFAULT and don't count.
+		 * For secretmem, don't allow the memory to be unlocked.
+		 */
 		goto out;
 
 	vma = vma_modify_flags(vmi, *prev, vma, start, end, &newflags);
diff --git a/mm/vma.c b/mm/vma.c
index be64f781a3aa..18c3c5280748 100644
--- a/mm/vma.c
+++ b/mm/vma.c
@@ -2589,9 +2589,7 @@ static void __mmap_complete(struct mmap_state *map, struct vm_area_struct *vma)
 
 	vm_stat_account(mm, vma->vm_flags, map->pglen);
 	if (vm_flags & VM_LOCKED) {
-		if ((vm_flags & VM_SPECIAL) || vma_is_dax(vma) ||
-					is_vm_hugetlb_page(vma) ||
-					vma == get_gate_vma(mm))
+		if (!vma_supports_mlock(vma))
 			vm_flags_clear(vma, VM_LOCKED_MASK);
 		else
 			mm->locked_vm += map->pglen;
diff --git a/tools/testing/vma/include/stubs.h b/tools/testing/vma/include/stubs.h
index 947a3a0c2566..416bb93f5005 100644
--- a/tools/testing/vma/include/stubs.h
+++ b/tools/testing/vma/include/stubs.h
@@ -426,3 +426,8 @@ static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
 }
 
 static inline void hugetlb_split(struct vm_area_struct *, unsigned long) {}
+
+static inline bool vma_supports_mlock(const struct vm_area_struct *vma)
+{
+	return false;
+}
-- 
2.47.3