From: Chuck Lever <chuck.lever@xxxxxxxxxx>
[ Upstream commit 1caf5f61dd8430ae5a0b4538afe4953ce7517cbb ]
The "statp + 1" pointer that is passed to nfsd_cache_update() is
supposed to point to the start of the egress NFS Reply header. In
fact, it does point there for AUTH_SYS and RPCSEC_GSS_KRB5 requests.
But both krb5i and krb5p add fields between the RPC header's
accept_stat field and the start of the NFS Reply header. In those
cases, "statp + 1" points at the extra fields instead of the Reply.
The result is that nfsd_cache_update() caches what looks to the
client like garbage.
A connection break can occur for a number of reasons, but the most
common reason when using krb5i/p is a GSS sequence number window
underrun. When an underrun is detected, the server is obliged to
drop the RPC and the connection to force a retransmit with a fresh
GSS sequence number. The client presents the same XID, it hits in
the server's DRC, and the server returns the garbage cache entry.
The "statp + 1" argument has been used since the oldest changeset
in the kernel history repo, so it has been in nfsd_dispatch()
literally since before history began. The problem arose only when
the server-side GSS implementation was added twenty years ago.
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
Tested-by: Jeff Layton <jlayton@xxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
fs/nfsd/nfssvc.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index 6b20f285f3ca..ca2a9d0eefc2 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -1027,6 +1027,7 @@ nfsd(void *vrqstp)
int nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp)
{
const struct svc_procedure *proc = rqstp->rq_procinfo;
+ __be32 *nfs_reply;
/*
* Give the xdr decoder a chance to change this if it wants
@@ -1053,6 +1054,7 @@ int nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp)
*/
svcxdr_init_encode(rqstp);
+ nfs_reply = xdr_inline_decode(&rqstp->rq_res_stream, 0);
*statp = proc->pc_func(rqstp);
if (*statp == rpc_drop_reply || test_bit(RQ_DROPME, &rqstp->rq_flags))
goto out_update_drop;
@@ -1060,7 +1062,7 @@ int nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp)
if (!proc->pc_encode(rqstp, &rqstp->rq_res_stream))
goto out_encode_err;
- nfsd_cache_update(rqstp, rqstp->rq_cachetype, statp + 1);
+ nfsd_cache_update(rqstp, rqstp->rq_cachetype, nfs_reply);
out_cached_reply:
return 1;
