NFSD: Fix handling of oversized NFSv4 COMPOUND requests

If an NFS server returns NFS4ERR_RESOURCE on the first operation in
an NFSv4 COMPOUND, there's no way for a client to know where the
problem is and then simplify the compound to make forward progress.

So instead, make NFSD process as many operations in an oversized
COMPOUND as it can and then return NFS4ERR_RESOURCE on the first
operation it did not process.

pynfs NFSv4.0 COMP6 exercises this case, but checks only for the
COMPOUND status code, not whether the server has processed any
of the operations.

pynfs NFSv4.1 SEQ6 and SEQ7 exercise the NFSv4.1 case, which detects
too many operations per COMPOUND by checking against the limits
negotiated when the session was created.

Suggested-by: Bruce Fields <bfields@fieldses.org>
Fixes: 0078117c6d91 ("nfsd: return RESOURCE not GARBAGE_ARGS on too many ops")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 7055e1c..6ef0795 100644 (file)
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -2631,9 +2631,6 @@ nfsd4_proc_compound(struct svc_rqst *rqstp)
        status = nfserr_minor_vers_mismatch;
        if (nfsd_minorversion(nn, args->minorversion, NFSD_TEST) <= 0)
                goto out;
-       status = nfserr_resource;
-       if (args->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
-               goto out;
 
        status = nfs41_check_op_ordering(args);
        if (status) {
@@ -2646,10 +2643,20 @@ nfsd4_proc_compound(struct svc_rqst *rqstp)
 
        rqstp->rq_lease_breaker = (void **)&cstate->clp;
 
-       trace_nfsd_compound(rqstp, args->opcnt);
+       trace_nfsd_compound(rqstp, args->client_opcnt);
        while (!status && resp->opcnt < args->opcnt) {
                op = &args->ops[resp->opcnt++];
 
+               if (unlikely(resp->opcnt == NFSD_MAX_OPS_PER_COMPOUND)) {
+                       /* If there are still more operations to process,
+                        * stop here and report NFS4ERR_RESOURCE. */
+                       if (cstate->minorversion == 0 &&
+                           args->client_opcnt > resp->opcnt) {
+                               op->status = nfserr_resource;
+                               goto encode_op;
+                       }
+               }
+
                /*
                 * The XDR decode routines may have pre-set op->status;
                 * for example, if there is a miscellaneous XDR error
@@ -2725,8 +2732,8 @@ encode_op:
                        status = op->status;
                }
 
-               trace_nfsd_compound_status(args->opcnt, resp->opcnt, status,
-                                          nfsd4_op_name(op->opnum));
+               trace_nfsd_compound_status(args->client_opcnt, resp->opcnt,
+                                          status, nfsd4_op_name(op->opnum));
 
                nfsd4_cstate_clear_replay(cstate);
                nfsd4_increment_op_stats(op->opnum);

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 4b69e86..09519b4 100644 (file)
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -2359,16 +2359,10 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
 
        if (xdr_stream_decode_u32(argp->xdr, &argp->minorversion) < 0)
                return false;
-       if (xdr_stream_decode_u32(argp->xdr, &argp->opcnt) < 0)
+       if (xdr_stream_decode_u32(argp->xdr, &argp->client_opcnt) < 0)
                return false;
-
-       /*
-        * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS
-        * here, so we return success at the xdr level so that
-        * nfsd4_proc can handle this is an NFS-level error.
-        */
-       if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
-               return true;
+       argp->opcnt = min_t(u32, argp->client_opcnt,
+                           NFSD_MAX_OPS_PER_COMPOUND);
 
        if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
                argp->ops = vcalloc(argp->opcnt, sizeof(*argp->ops));

diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index 9626725..466e278 100644 (file)
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -717,9 +717,10 @@ struct nfsd4_compoundargs {
        struct svcxdr_tmpbuf            *to_free;
        struct svc_rqst                 *rqstp;
 
-       u32                             taglen;
        char *                          tag;
+       u32                             taglen;
        u32                             minorversion;
+       u32                             client_opcnt;
        u32                             opcnt;
        struct nfsd4_op                 *ops;
        struct nfsd4_op                 iops[8];