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linux-next/net/sunrpc/sunrpc_syms.c
Bruce Allan f35279d3f7 [PATCH] sunrpc: cache_register can use wrong module reference 
When registering an RPC cache, cache_register() always sets the owner as the
sunrpc module.  However, there are RPC caches owned by other modules.  With
the incorrect owner setting, the real owning module can be removed potentially
with an open reference to the cache from userspace.

For example, if one were to stop the nfs server and unmount the nfsd
filesystem, the nfsd module could be removed eventhough rpc.idmapd had
references to the idtoname and nametoid caches (i.e.
/proc/net/rpc/nfs4.<cachename>/channel is still open).  This resulted in a
system panic on one of our machines when attempting to restart the nfs
services after reloading the nfsd module.

The following patch adds a 'struct module *owner' field in struct
cache_detail.  The owner is further assigned to the struct proc_dir_entry
in cache_register() so that the module cannot be unloaded while user-space
daemons have an open reference on the associated file under /proc.

Signed-off-by: Bruce Allan <bwa@us.ibm.com>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-07 16:57:25 -07:00

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/*
* linux/net/sunrpc/sunrpc_syms.c
*
* Symbols exported by the sunrpc module.
*
* Copyright (C) 1997 Olaf Kirch <okir@monad.swb.de>
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sched.h>
#include <linux/uio.h>
#include <linux/unistd.h>
#include <linux/init.h>
#include <linux/sunrpc/sched.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/svcsock.h>
#include <linux/sunrpc/auth.h>
#include <linux/workqueue.h>
#include <linux/sunrpc/rpc_pipe_fs.h>
/* RPC scheduler */
EXPORT_SYMBOL(rpc_execute);
EXPORT_SYMBOL(rpc_init_task);
EXPORT_SYMBOL(rpc_sleep_on);
EXPORT_SYMBOL(rpc_wake_up_next);
EXPORT_SYMBOL(rpc_wake_up_task);
EXPORT_SYMBOL(rpc_new_child);
EXPORT_SYMBOL(rpc_run_child);
EXPORT_SYMBOL(rpciod_down);
EXPORT_SYMBOL(rpciod_up);
EXPORT_SYMBOL(rpc_new_task);
EXPORT_SYMBOL(rpc_wake_up_status);
EXPORT_SYMBOL(rpc_release_task);
/* RPC client functions */
EXPORT_SYMBOL(rpc_create_client);
EXPORT_SYMBOL(rpc_new_client);
EXPORT_SYMBOL(rpc_clone_client);
EXPORT_SYMBOL(rpc_bind_new_program);
EXPORT_SYMBOL(rpc_destroy_client);
EXPORT_SYMBOL(rpc_shutdown_client);
EXPORT_SYMBOL(rpc_release_client);
EXPORT_SYMBOL(rpc_killall_tasks);
EXPORT_SYMBOL(rpc_call_sync);
EXPORT_SYMBOL(rpc_call_async);
EXPORT_SYMBOL(rpc_call_setup);
EXPORT_SYMBOL(rpc_clnt_sigmask);
EXPORT_SYMBOL(rpc_clnt_sigunmask);
EXPORT_SYMBOL(rpc_delay);
EXPORT_SYMBOL(rpc_restart_call);
EXPORT_SYMBOL(rpc_setbufsize);
EXPORT_SYMBOL(rpc_unlink);
EXPORT_SYMBOL(rpc_wake_up);
EXPORT_SYMBOL(rpc_queue_upcall);
EXPORT_SYMBOL(rpc_mkpipe);
/* Client transport */
EXPORT_SYMBOL(xprt_create_proto);
EXPORT_SYMBOL(xprt_set_timeout);
EXPORT_SYMBOL(xprt_udp_slot_table_entries);
EXPORT_SYMBOL(xprt_tcp_slot_table_entries);
/* Client credential cache */
EXPORT_SYMBOL(rpcauth_register);
EXPORT_SYMBOL(rpcauth_unregister);
EXPORT_SYMBOL(rpcauth_create);
EXPORT_SYMBOL(rpcauth_lookupcred);
EXPORT_SYMBOL(rpcauth_lookup_credcache);
EXPORT_SYMBOL(rpcauth_free_credcache);
EXPORT_SYMBOL(rpcauth_init_credcache);
EXPORT_SYMBOL(put_rpccred);
/* RPC server stuff */
EXPORT_SYMBOL(svc_create);
EXPORT_SYMBOL(svc_create_thread);
EXPORT_SYMBOL(svc_exit_thread);
EXPORT_SYMBOL(svc_destroy);
EXPORT_SYMBOL(svc_drop);
EXPORT_SYMBOL(svc_process);
EXPORT_SYMBOL(svc_recv);
EXPORT_SYMBOL(svc_wake_up);
EXPORT_SYMBOL(svc_makesock);
EXPORT_SYMBOL(svc_reserve);
EXPORT_SYMBOL(svc_auth_register);
EXPORT_SYMBOL(auth_domain_lookup);
EXPORT_SYMBOL(svc_authenticate);
EXPORT_SYMBOL(svc_set_client);
/* RPC statistics */
#ifdef CONFIG_PROC_FS
EXPORT_SYMBOL(rpc_proc_register);
EXPORT_SYMBOL(rpc_proc_unregister);
EXPORT_SYMBOL(svc_proc_register);
EXPORT_SYMBOL(svc_proc_unregister);
EXPORT_SYMBOL(svc_seq_show);
#endif
/* caching... */
EXPORT_SYMBOL(auth_domain_find);
EXPORT_SYMBOL(auth_domain_put);
EXPORT_SYMBOL(auth_unix_add_addr);
EXPORT_SYMBOL(auth_unix_forget_old);
EXPORT_SYMBOL(auth_unix_lookup);
EXPORT_SYMBOL(cache_check);
EXPORT_SYMBOL(cache_flush);
EXPORT_SYMBOL(cache_purge);
EXPORT_SYMBOL(cache_fresh);
EXPORT_SYMBOL(cache_init);
EXPORT_SYMBOL(cache_register);
EXPORT_SYMBOL(cache_unregister);
EXPORT_SYMBOL(qword_add);
EXPORT_SYMBOL(qword_addhex);
EXPORT_SYMBOL(qword_get);
EXPORT_SYMBOL(svcauth_unix_purge);
EXPORT_SYMBOL(unix_domain_find);
/* Generic XDR */
EXPORT_SYMBOL(xdr_encode_string);
EXPORT_SYMBOL(xdr_decode_string);
EXPORT_SYMBOL(xdr_decode_string_inplace);
EXPORT_SYMBOL(xdr_decode_netobj);
EXPORT_SYMBOL(xdr_encode_netobj);
EXPORT_SYMBOL(xdr_encode_pages);
EXPORT_SYMBOL(xdr_inline_pages);
EXPORT_SYMBOL(xdr_shift_buf);
EXPORT_SYMBOL(xdr_encode_word);
EXPORT_SYMBOL(xdr_decode_word);
EXPORT_SYMBOL(xdr_encode_array2);
EXPORT_SYMBOL(xdr_decode_array2);
EXPORT_SYMBOL(xdr_buf_from_iov);
EXPORT_SYMBOL(xdr_buf_subsegment);
EXPORT_SYMBOL(xdr_buf_read_netobj);
EXPORT_SYMBOL(read_bytes_from_xdr_buf);
/* Debugging symbols */
#ifdef RPC_DEBUG
EXPORT_SYMBOL(rpc_debug);
EXPORT_SYMBOL(nfs_debug);
EXPORT_SYMBOL(nfsd_debug);
EXPORT_SYMBOL(nlm_debug);
#endif
extern int register_rpc_pipefs(void);
extern void unregister_rpc_pipefs(void);
static int __init
init_sunrpc(void)
{
int err = register_rpc_pipefs();
if (err)
goto out;
err = rpc_init_mempool() != 0;
if (err)
goto out;
#ifdef RPC_DEBUG
rpc_register_sysctl();
#endif
#ifdef CONFIG_PROC_FS
rpc_proc_init();
#endif
cache_register(&auth_domain_cache);
cache_register(&ip_map_cache);
out:
return err;
}
static void __exit
cleanup_sunrpc(void)
{
unregister_rpc_pipefs();
rpc_destroy_mempool();
if (cache_unregister(&auth_domain_cache))
printk(KERN_ERR "sunrpc: failed to unregister auth_domain cache\n");
if (cache_unregister(&ip_map_cache))
printk(KERN_ERR "sunrpc: failed to unregister ip_map cache\n");
#ifdef RPC_DEBUG
rpc_unregister_sysctl();
#endif
#ifdef CONFIG_PROC_FS
rpc_proc_exit();
#endif
}
MODULE_LICENSE("GPL");
module_init(init_sunrpc);
module_exit(cleanup_sunrpc);
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