Linux-libre 4.5-gnu

1 files changed, 20 insertions, 0 deletions

diff --git a/kernel/bpf/inode.c b/kernel/bpf/inode.c
index 5a8a797d5..f2ece3c17 100644
--- a/kernel/bpf/inode.c
+++ b/kernel/bpf/inode.c
@@ -187,11 +187,31 @@ static int bpf_mkobj(struct inode *dir, struct dentry *dentry, umode_t mode,
 	}
 }
 
+static int bpf_link(struct dentry *old_dentry, struct inode *dir,
+		    struct dentry *new_dentry)
+{
+	if (bpf_dname_reserved(new_dentry))
+		return -EPERM;
+
+	return simple_link(old_dentry, dir, new_dentry);
+}
+
+static int bpf_rename(struct inode *old_dir, struct dentry *old_dentry,
+		      struct inode *new_dir, struct dentry *new_dentry)
+{
+	if (bpf_dname_reserved(new_dentry))
+		return -EPERM;
+
+	return simple_rename(old_dir, old_dentry, new_dir, new_dentry);
+}
+
 static const struct inode_operations bpf_dir_iops = {
 	.lookup		= simple_lookup,
 	.mknod		= bpf_mkobj,
 	.mkdir		= bpf_mkdir,
 	.rmdir		= simple_rmdir,
+	.rename		= bpf_rename,
+	.link		= bpf_link,
 	.unlink		= simple_unlink,
 };