[PATCH] mm: remove_mapping() safeness

[pandora-kernel.git] / mm / madvise.c

diff --git a/mm/madvise.c b/mm/madvise.c
index af3d573..4e19615 100644 (file)
--- 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)