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NFSv4: Fix EXCHANGE_ID corrupt verifier issue 

The verifier is allocated on the stack, but the EXCHANGE_ID RPC call was
changed to be asynchronous by commit 8d89bd70bc. 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: 8d89bd70bc ("NFS setup async exchange_id")
Cc: stable@vger.kernel.org # v4.9+
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2017-08-01 16:02:47 -04:00 committed by Anna Schumaker
parent b7dbcc0e43
commit fd40559c86
3 changed files with 6 additions and 9 deletions
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11
fs/nfs/nfs4proc.c
View File

@ -7460,7 +7460,7 @@ static void nfs4_exchange_id_done(struct rpc_task *task, void *data)
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:
@ -7497,7 +7497,6 @@ static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
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,
@ -7521,8 +7520,7 @@ static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
return -ENOMEM;
}
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)
@ -7563,9 +7561,8 @@ static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
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

2
fs/nfs/nfs4xdr.c
View File

@ -1785,7 +1785,7 @@ static void encode_exchange_id(struct xdr_stream *xdr,
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);

2
include/linux/nfs_xdr.h
View File

@ -1235,7 +1235,7 @@ 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;
};