X-Git-Url: http://git.cascardo.info/?a=blobdiff_plain;f=mm%2Fmadvise.c;h=4e196155a0c3635801bd0f8dcff0b18ce1bbcf37;hb=f0ee3404cce2c45f8b95b341dd6311cd92e5cee0;hp=af3d573b014122f7fd2a99c3ee90c3826f70457f;hpb=409761bb6a06bd61e2d8e27a1af534371d9537ed;p=cascardo%2Flinux.git

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)