From 7518a3dc5ea249d4112156ce71b8b184eb786151 Mon Sep 17 00:00:00 2001
From: Chuck Lever <chuck.lever@oracle.com>
Date: Mon, 5 Sep 2022 15:33:32 -0400
Subject: [PATCH] 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>
---
fs/nfsd/nfs4proc.c | 19 +++++++++++++------
fs/nfsd/nfs4xdr.c | 12 +++---------
fs/nfsd/xdr4.h | 3 ++-
3 files changed, 18 insertions(+), 16 deletions(-)
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 7055e1c91d0ef..6ef0795fefb45 100644
--- 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 @@ nfsd4_proc_compound(struct svc_rqst *rqstp)
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 4b69e86240eb2..09519b4a860a9 100644
--- 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 96267258e6291..466e2786fc976 100644
--- 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];