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SUNRPC: Ensure we respect the RPCSEC_GSS sequence number limit 

According to RFC2203, the RPCSEC_GSS sequence numbers are bounded to
an upper limit of MAXSEQ = 0x80000000. Ensure that we handle that
correctly.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2019-01-02 17:53:13 -05:00 committed by Anna Schumaker
parent e66721f043
commit 97b78ae96b
2 changed files with 21 additions and 10 deletions
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12
net/sunrpc/auth_gss/auth_gss.c
View File

@ -1549,8 +1549,10 @@ gss_marshal(struct rpc_task *task, __be32 *p)
cred_len = p++;
spin_lock(&ctx->gc_seq_lock);
req->rq_seqno = ctx->gc_seq++;
req->rq_seqno = (ctx->gc_seq < MAXSEQ) ? ctx->gc_seq++ : MAXSEQ;
spin_unlock(&ctx->gc_seq_lock);
if (req->rq_seqno == MAXSEQ)
goto out_expired;
*p++ = htonl((u32) RPC_GSS_VERSION);
*p++ = htonl((u32) ctx->gc_proc);
@ -1572,14 +1574,18 @@ gss_marshal(struct rpc_task *task, __be32 *p)
mic.data = (u8 *)(p + 1);
maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
goto out_expired;
} else if (maj_stat != 0) {
printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat);
pr_warn("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat);
task->tk_status = -EIO;
goto out_put_ctx;
}
p = xdr_encode_opaque(p, NULL, mic.len);
gss_put_ctx(ctx);
return p;
out_expired:
clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
task->tk_status = -EKEYEXPIRED;
out_put_ctx:
gss_put_ctx(ctx);
return NULL;

19
net/sunrpc/clnt.c
View File

@ -1741,11 +1741,8 @@ rpc_xdr_encode(struct rpc_task *task)
req->rq_rcvsize);
p = rpc_encode_header(task);
if (p == NULL) {
printk(KERN_INFO "RPC: couldn't encode RPC header, exit EIO\n");
rpc_exit(task, -EIO);
if (p == NULL)
return;
}
encode = task->tk_msg.rpc_proc->p_encode;
if (encode == NULL)
@ -1770,10 +1767,17 @@ call_encode(struct rpc_task *task)
/* Did the encode result in an error condition? */
if (task->tk_status != 0) {
/* Was the error nonfatal? */
if (task->tk_status == -EAGAIN || task->tk_status == -ENOMEM)
switch (task->tk_status) {
case -EAGAIN:
case -ENOMEM:
rpc_delay(task, HZ >> 4);
else
break;
case -EKEYEXPIRED:
task->tk_action = call_refresh;
break;
default:
rpc_exit(task, task->tk_status);
}
return;
}
@ -2335,7 +2339,8 @@ rpc_encode_header(struct rpc_task *task)
*p++ = htonl(clnt->cl_vers); /* program version */
*p++ = htonl(task->tk_msg.rpc_proc->p_proc); /* procedure */
p = rpcauth_marshcred(task, p);
req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
if (p)
req->rq_slen = xdr_adjust_iovec(&req->rq_svec[0], p);
return p;
}