From: Andy Adamson <andros@xxxxxxxxxx>
Signed-off-by: Andy Adamson<andros@xxxxxxxxxx>
[nfsd41: do not verify nfserr_sequence_pos for minorversion 0]
Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
---
fs/nfsd/nfs4proc.c | 40 ++++++++++++++++++++++++++++++++--------
fs/nfsd/nfs4state.c | 4 ++++
2 files changed, 36 insertions(+), 8 deletions(-)
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index f7be7fa..ec51936 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -811,14 +811,15 @@ static inline void nfsd4_increment_op_stats(u32 opnum)
typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
void *);
+enum nfsd4_op_flags {
+ ALLOWED_WITHOUT_FH = 1 << 0, /* No current filehandle required */
+ ALLOWED_ON_ABSENT_FS = 2 << 0, /* ops processed on absent fs */
+ ALLOWED_AS_FIRST_OP = 3 << 0, /* ops reqired first in compound */
+};
struct nfsd4_operation {
nfsd4op_func op_func;
u32 op_flags;
-/* Most ops require a valid current filehandle; a few don't: */
-#define ALLOWED_WITHOUT_FH 1
-/* GETATTR and ops not listed as returning NFS4ERR_MOVED: */
-#define ALLOWED_ON_ABSENT_FS 2
char *op_name;
};
@@ -827,6 +828,23 @@ static struct nfsd4_operation nfsd4_ops[];
static const char *nfsd4_op_name(unsigned opnum);
/*
+ * Enforce NFSv4.1 COMPOUND ordering rules.
+ *
+ * TODO:
+ * - enforce NFS4ERR_NOT_ONLY_OP,
+ * - DESTROY_SESSION MUST be the final operation in the COMPOUND request.
+ */
+static bool nfs41_op_ordering_ok(struct nfsd4_compoundargs *args)
+{
+ if (args->minorversion && args->opcnt > 0) {
+ struct nfsd4_op *op = &args->ops[0];
+ return (op->status == nfserr_op_illegal) ||
+ (nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP);
+ }
+ return true;
+}
+
+/*
* COMPOUND call.
*/
static __be32
@@ -864,6 +882,12 @@ nfsd4_proc_compound(struct svc_rqst *rqstp,
if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
goto out;
+ if (!nfs41_op_ordering_ok(args)) {
+ op = &args->ops[0];
+ op->status = nfserr_sequence_pos;
+ goto encode_op;
+ }
+
status = nfs_ok;
while (!status && resp->opcnt < args->opcnt) {
op = &args->ops[resp->opcnt++];
@@ -1105,22 +1129,22 @@ static struct nfsd4_operation nfsd4_ops[] = {
/* NFSv4.1 operations */
[OP_EXCHANGE_ID] = {
.op_func = (nfsd4op_func)nfsd4_exchange_id,
- .op_flags = ALLOWED_WITHOUT_FH,
+ .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
.op_name = "OP_EXCHANGE_ID",
},
[OP_CREATE_SESSION] = {
.op_func = (nfsd4op_func)nfsd4_create_session,
- .op_flags = ALLOWED_WITHOUT_FH,
+ .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
.op_name = "OP_CREATE_SESSION",
},
[OP_DESTROY_SESSION] = {
.op_func = (nfsd4op_func)nfsd4_destroy_session,
- .op_flags = ALLOWED_WITHOUT_FH,
+ .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
.op_name = "OP_DESTROY_SESSION",
},
[OP_SEQUENCE] = {
.op_func = (nfsd4op_func)nfsd4_sequence,
- .op_flags = ALLOWED_WITHOUT_FH,
+ .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
.op_name = "OP_SEQUENCE",
},
};
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 24b6e05..9243dca 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1047,10 +1047,14 @@ nfsd4_sequence(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate,
struct nfsd4_sequence *seq)
{
+ struct nfsd4_compoundres *resp = rqstp->rq_resp;
struct nfsd4_session *session;
struct nfsd4_slot *slot;
int status;
+ if (resp->opcnt != 1)
+ return nfserr_sequence_pos;
+
spin_lock(&sessionid_lock);
status = nfserr_badsession;
session = find_in_sessionid_hashtbl(&seq->sessionid);
--
1.6.2.1
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