NFSD: Add missing NFSv2 .pc_func methods

There's no protection in nfsd_dispatch() against a NULL .pc_func
helpers. A malicious NFS client can trigger a crash by invoking the
unused/unsupported NFSv2 ROOT or WRITECACHE procedures.

The current NFSD dispatcher does not support returning a void reply
to a non-NULL procedure, so the reply to both of these is wrong, for
the moment.

Cc: <stable@vger.kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/nfsproc.c b/fs/nfsd/nfsproc.c
index 6e0b066..6d1b3af 100644 (file)
--- a/fs/nfsd/nfsproc.c
+++ b/fs/nfsd/nfsproc.c
@@ -118,6 +118,13 @@ done:
        return nfsd_return_attrs(nfserr, resp);
 }
 
+/* Obsolete, replaced by MNTPROC_MNT. */
+static __be32
+nfsd_proc_root(struct svc_rqst *rqstp)
+{
+       return nfs_ok;
+}
+
 /*
  * Look up a path name component
  * Note: the dentry in the resp->fh may be negative if the file
@@ -203,6 +210,13 @@ nfsd_proc_read(struct svc_rqst *rqstp)
        return fh_getattr(&resp->fh, &resp->stat);
 }
 
+/* Reserved */
+static __be32
+nfsd_proc_writecache(struct svc_rqst *rqstp)
+{
+       return nfs_ok;
+}
+
 /*
  * Write data to a file
  * N.B. After this call resp->fh needs an fh_put
@@ -617,6 +631,7 @@ static const struct svc_procedure nfsd_procedures2[18] = {
                .pc_xdrressize = ST+AT,
        },
        [NFSPROC_ROOT] = {
+               .pc_func = nfsd_proc_root,
                .pc_decode = nfssvc_decode_void,
                .pc_encode = nfssvc_encode_void,
                .pc_argsize = sizeof(struct nfsd_void),
@@ -654,6 +669,7 @@ static const struct svc_procedure nfsd_procedures2[18] = {
                .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
        },
        [NFSPROC_WRITECACHE] = {
+               .pc_func = nfsd_proc_writecache,
                .pc_decode = nfssvc_decode_void,
                .pc_encode = nfssvc_encode_void,
                .pc_argsize = sizeof(struct nfsd_void),