1 files changed, 3 insertions, 0 deletions

diff --git a/mm/madvise.c b/mm/madvise.c
index af3d573b0141..4e196155a0c3 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -168,6 +168,9 @@ static long madvise_remove(struct vm_area_struct *vma,
                         return -EINVAL;
         }
 
+        if ((vma->vm_flags & (VM_SHARED|VM_WRITE)) != (VM_SHARED|VM_WRITE))
+                return -EACCES;
+
         mapping = vma->vm_file->f_mapping;
 
         offset = (loff_t)(start - vma->vm_start)