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NFS: Fix infinite loop in gss_create_upcall()

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There can be an infinite loop if gss_create_upcall() is called without
the userspace program running.  To prevent this, we return -EACCES if
we notice that pipe_version hasn't changed (indicating that the pipe
has not been opened).

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Bryan Schumaker 2011-04-13 14:31:28 -04:00 committed by Trond Myklebust
parent 79a48a1f5d
commit d1a8016a2d
2 changed files with 8 additions and 5 deletions
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5
fs/nfs/nfs4proc.c
View file

@ -2224,8 +2224,9 @@ static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
for (i = 0; i < len; i++) {
status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
if (status != -EPERM)
break;
if (status == -EPERM || status == -EACCES)
continue;
break;
}
if (status == 0)
status = nfs4_server_capabilities(server, fhandle);

8
net/sunrpc/auth_gss/auth_gss.c
View file

@ -520,7 +520,7 @@ gss_refresh_upcall(struct rpc_task *task)
warn_gssd();
task->tk_timeout = 15*HZ;
rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL);
return 0;
return -EAGAIN;
}
if (IS_ERR(gss_msg)) {
err = PTR_ERR(gss_msg);
@ -563,10 +563,12 @@ gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
if (PTR_ERR(gss_msg) == -EAGAIN) {
err = wait_event_interruptible_timeout(pipe_version_waitqueue,
pipe_version >= 0, 15*HZ);
if (pipe_version < 0) {
warn_gssd();
err = -EACCES;
}
if (err)
goto out;
if (pipe_version < 0)
warn_gssd();
goto retry;
}
if (IS_ERR(gss_msg)) {