4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
commit fd40559c8657418385e42f797e0b04bfc0add748 upstream.
The verifier is allocated on the stack, but the EXCHANGE_ID RPC call was
changed to be asynchronous by commit 8d89bd70bc939. If we interrrupt
the call to rpc_wait_for_completion_task(), we can therefore end up
transmitting random stack contents in lieu of the verifier.
Fixes: 8d89bd70bc939 ("NFS setup async exchange_id")
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/nfs/nfs4proc.c | 11 ++++-------
fs/nfs/nfs4xdr.c | 2 +-
include/linux/nfs_xdr.h | 2 +-
3 files changed, 6 insertions(+), 9 deletions(-)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -7410,7 +7410,7 @@ static void nfs4_exchange_id_done(struct
cdata->res.server_scope = NULL;
}
/* Save the EXCHANGE_ID verifier session trunk tests */
- memcpy(clp->cl_confirm.data, cdata->args.verifier->data,
+ memcpy(clp->cl_confirm.data, cdata->args.verifier.data,
sizeof(clp->cl_confirm.data));
}
out:
@@ -7447,7 +7447,6 @@ static const struct rpc_call_ops nfs4_ex
static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
u32 sp4_how, struct rpc_xprt *xprt)
{
- nfs4_verifier verifier;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
.rpc_cred = cred,
@@ -7470,8 +7469,7 @@ static int _nfs4_proc_exchange_id(struct
if (!calldata)
goto out;
- if (!xprt)
- nfs4_init_boot_verifier(clp, &verifier);
+ nfs4_init_boot_verifier(clp, &calldata->args.verifier);
status = nfs4_init_uniform_client_string(clp);
if (status)
@@ -7516,9 +7514,8 @@ static int _nfs4_proc_exchange_id(struct
task_setup_data.rpc_xprt = xprt;
task_setup_data.flags =
RPC_TASK_SOFT|RPC_TASK_SOFTCONN|RPC_TASK_ASYNC;
- calldata->args.verifier = &clp->cl_confirm;
- } else {
- calldata->args.verifier = &verifier;
+ memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
+ sizeof(calldata->args.verifier.data));
}
calldata->args.client = clp;
#ifdef CONFIG_NFS_V4_1_MIGRATION
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -1761,7 +1761,7 @@ static void encode_exchange_id(struct xd
int len = 0;
encode_op_hdr(xdr, OP_EXCHANGE_ID, decode_exchange_id_maxsz, hdr);
- encode_nfs4_verifier(xdr, args->verifier);
+ encode_nfs4_verifier(xdr, &args->verifier);
encode_string(xdr, strlen(args->client->cl_owner_id),
args->client->cl_owner_id);
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1199,7 +1199,7 @@ struct nfs41_state_protection {
struct nfs41_exchange_id_args {
struct nfs_client *client;
- nfs4_verifier *verifier;
+ nfs4_verifier verifier;
u32 flags;
struct nfs41_state_protection state_protect;
};