Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
fs/nfsd/nfs4xdr.c | 165 ++++++++++++++++++++++++++++++++++-------------------
1 file changed, 107 insertions(+), 58 deletions(-)
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 8e2609658904..d9c57b2f3fcf 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -210,6 +210,25 @@ static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
* NFSv4 basic data type decoders
*/
+/*
+ * This helper handles variable-length opaques which belong to protocol
+ * elements that this implementation does not support.
+ */
+static __be32
+nfsd4_decode_ignored_string(struct nfsd4_compoundargs *argp, u32 maxlen)
+{
+ u32 len;
+
+ if (xdr_stream_decode_u32(argp->xdr, &len) < 0)
+ return nfserr_bad_xdr;
+ if (maxlen && len > maxlen)
+ return nfserr_bad_xdr;
+ if (!xdr_inline_decode(argp->xdr, len))
+ return nfserr_bad_xdr;
+
+ return nfs_ok;
+}
+
static __be32
nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
{
@@ -590,87 +609,117 @@ nfsd4_decode_stateid4(struct nfsd4_compoundargs *argp, stateid_t *sid)
return nfs_ok;
}
-static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
+/* Defined in Appendix A of RFC 5531 */
+static __be32
+nfsd4_decode_authsys_parms(struct nfsd4_compoundargs *argp,
+ struct nfsd4_cb_sec *cbs)
{
- DECODE_HEAD;
- struct user_namespace *userns = nfsd_user_namespace(argp->rqstp);
- u32 dummy, uid, gid;
- char *machine_name;
- int i;
- int nr_secflavs;
+ u32 stamp, gidcount, uid, gid;
+ __be32 *p, status;
+
+ if (xdr_stream_decode_u32(argp->xdr, &stamp) < 0)
+ return nfserr_bad_xdr;
+ /* machine name */
+ status = nfsd4_decode_ignored_string(argp, 255);
+ if (status)
+ return status;
+ if (xdr_stream_decode_u32(argp->xdr, &uid) < 0)
+ return nfserr_bad_xdr;
+ if (xdr_stream_decode_u32(argp->xdr, &gid) < 0)
+ return nfserr_bad_xdr;
+ if (xdr_stream_decode_u32(argp->xdr, &gidcount) < 0)
+ return nfserr_bad_xdr;
+ if (gidcount > 16)
+ return nfserr_bad_xdr;
+ p = xdr_inline_decode(argp->xdr, gidcount << 2);
+ if (!p)
+ return nfserr_bad_xdr;
+ if (cbs->flavor == (u32)(-1)) {
+ struct user_namespace *userns = nfsd_user_namespace(argp->rqstp);
+
+ kuid_t kuid = make_kuid(userns, uid);
+ kgid_t kgid = make_kgid(userns, gid);
+ if (uid_valid(kuid) && gid_valid(kgid)) {
+ cbs->uid = kuid;
+ cbs->gid = kgid;
+ cbs->flavor = RPC_AUTH_UNIX;
+ } else {
+ dprintk("RPC_AUTH_UNIX with invalid uid or gid, ignoring!\n");
+ }
+ }
+
+ return nfs_ok;
+}
+
+static __be32
+nfsd4_decode_gss_cb_handles4(struct nfsd4_compoundargs *argp,
+ struct nfsd4_cb_sec *cbs)
+{
+ __be32 status;
+ u32 service;
+
+ dprintk("RPC_AUTH_GSS callback secflavor not supported!\n");
+
+ if (xdr_stream_decode_u32(argp->xdr, &service) < 0)
+ return nfserr_bad_xdr;
+ if (service < RPC_GSS_SVC_NONE || service > RPC_GSS_SVC_PRIVACY)
+ return nfserr_bad_xdr;
+ /* gcbp_handle_from_server */
+ status = nfsd4_decode_ignored_string(argp, 0);
+ if (status)
+ return status;
+ /* gcbp_handle_from_client */
+ status = nfsd4_decode_ignored_string(argp, 0);
+ if (status)
+ return status;
+
+ return nfs_ok;
+}
+
+/* a counted array of callback_sec_parms4 */
+static __be32
+nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
+{
+ u32 i, secflavor, nr_secflavs;
+ __be32 status;
/* callback_sec_params4 */
- READ_BUF(4);
- nr_secflavs = be32_to_cpup(p++);
+ if (xdr_stream_decode_u32(argp->xdr, &nr_secflavs) < 0)
+ return nfserr_bad_xdr;
if (nr_secflavs)
cbs->flavor = (u32)(-1);
else
/* Is this legal? Be generous, take it to mean AUTH_NONE: */
cbs->flavor = 0;
+
for (i = 0; i < nr_secflavs; ++i) {
- READ_BUF(4);
- dummy = be32_to_cpup(p++);
- switch (dummy) {
+ if (xdr_stream_decode_u32(argp->xdr, &secflavor) < 0)
+ return nfserr_bad_xdr;
+ switch (secflavor) {
case RPC_AUTH_NULL:
- /* Nothing to read */
+ /* void */
if (cbs->flavor == (u32)(-1))
cbs->flavor = RPC_AUTH_NULL;
break;
case RPC_AUTH_UNIX:
- READ_BUF(8);
- /* stamp */
- dummy = be32_to_cpup(p++);
-
- /* machine name */
- dummy = be32_to_cpup(p++);
- READ_BUF(dummy);
- SAVEMEM(machine_name, dummy);
-
- /* uid, gid */
- READ_BUF(8);
- uid = be32_to_cpup(p++);
- gid = be32_to_cpup(p++);
-
- /* more gids */
- READ_BUF(4);
- dummy = be32_to_cpup(p++);
- READ_BUF(dummy * 4);
- if (cbs->flavor == (u32)(-1)) {
- kuid_t kuid = make_kuid(userns, uid);
- kgid_t kgid = make_kgid(userns, gid);
- if (uid_valid(kuid) && gid_valid(kgid)) {
- cbs->uid = kuid;
- cbs->gid = kgid;
- cbs->flavor = RPC_AUTH_UNIX;
- } else {
- dprintk("RPC_AUTH_UNIX with invalid"
- "uid or gid ignoring!\n");
- }
- }
+ status = nfsd4_decode_authsys_parms(argp, cbs);
+ if (status)
+ return status;
break;
case RPC_AUTH_GSS:
- dprintk("RPC_AUTH_GSS callback secflavor "
- "not supported!\n");
- READ_BUF(8);
- /* gcbp_service */
- dummy = be32_to_cpup(p++);
- /* gcbp_handle_from_server */
- dummy = be32_to_cpup(p++);
- READ_BUF(dummy);
- p += XDR_QUADLEN(dummy);
- /* gcbp_handle_from_client */
- READ_BUF(4);
- dummy = be32_to_cpup(p++);
- READ_BUF(dummy);
+ status = nfsd4_decode_gss_cb_handles4(argp, cbs);
+ if (status)
+ return status;
break;
default:
- dprintk("Illegal callback secflavor\n");
return nfserr_inval;
}
}
- DECODE_TAIL;
+
+ return nfs_ok;
}
+
/*
* NFSv4 operation argument decoders
*/
