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-rw-r--r--mm/gup.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/mm/gup.c b/mm/gup.c
index f6d5563574..1611e73b11 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1669,20 +1669,22 @@ long populate_vma_page_range(struct vm_area_struct *vma,
if (vma->vm_flags & VM_LOCKONFAULT)
return nr_pages;
+ /* ... similarly, we've never faulted in PROT_NONE pages */
+ if (!vma_is_accessible(vma))
+ return -EFAULT;
+
gup_flags = FOLL_TOUCH;
/*
* We want to touch writable mappings with a write fault in order
* to break COW, except for shared mappings because these don't COW
* and we would not want to dirty them for nothing.
+ *
+ * Otherwise, do a read fault, and use FOLL_FORCE in case it's not
+ * readable (ie write-only or executable).
*/
if ((vma->vm_flags & (VM_WRITE | VM_SHARED)) == VM_WRITE)
gup_flags |= FOLL_WRITE;
-
- /*
- * We want mlock to succeed for regions that have any permissions
- * other than PROT_NONE.
- */
- if (vma_is_accessible(vma))
+ else
gup_flags |= FOLL_FORCE;
if (locked)