X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=mm%2Fmadvise.c;h=4e196155a0c3635801bd0f8dcff0b18ce1bbcf37;hb=1c7da74c4aab595a994beb5fe728ebf0d0b41f59;hp=af3d573b014122f7fd2a99c3ee90c3826f70457f;hpb=1f84253e3ce75fc1b2946a544e16c5c0c13c7017;p=linux-2.6

diff --git a/mm/madvise.c b/mm/madvise.c
index af3d573b01..4e196155a0 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)