f35279d3f7
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>
193 lines
4.8 KiB
C
193 lines
4.8 KiB
C
/*
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* linux/net/sunrpc/sunrpc_syms.c
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*
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* Symbols exported by the sunrpc module.
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*
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* Copyright (C) 1997 Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/sched.h>
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#include <linux/uio.h>
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#include <linux/unistd.h>
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#include <linux/init.h>
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#include <linux/sunrpc/sched.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/svc.h>
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#include <linux/sunrpc/svcsock.h>
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#include <linux/sunrpc/auth.h>
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#include <linux/workqueue.h>
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#include <linux/sunrpc/rpc_pipe_fs.h>
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/* RPC scheduler */
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EXPORT_SYMBOL(rpc_execute);
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EXPORT_SYMBOL(rpc_init_task);
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EXPORT_SYMBOL(rpc_sleep_on);
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EXPORT_SYMBOL(rpc_wake_up_next);
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EXPORT_SYMBOL(rpc_wake_up_task);
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EXPORT_SYMBOL(rpc_new_child);
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EXPORT_SYMBOL(rpc_run_child);
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EXPORT_SYMBOL(rpciod_down);
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EXPORT_SYMBOL(rpciod_up);
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EXPORT_SYMBOL(rpc_new_task);
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EXPORT_SYMBOL(rpc_wake_up_status);
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EXPORT_SYMBOL(rpc_release_task);
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/* RPC client functions */
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EXPORT_SYMBOL(rpc_create_client);
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EXPORT_SYMBOL(rpc_new_client);
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EXPORT_SYMBOL(rpc_clone_client);
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EXPORT_SYMBOL(rpc_bind_new_program);
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EXPORT_SYMBOL(rpc_destroy_client);
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EXPORT_SYMBOL(rpc_shutdown_client);
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EXPORT_SYMBOL(rpc_release_client);
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EXPORT_SYMBOL(rpc_killall_tasks);
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EXPORT_SYMBOL(rpc_call_sync);
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EXPORT_SYMBOL(rpc_call_async);
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EXPORT_SYMBOL(rpc_call_setup);
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EXPORT_SYMBOL(rpc_clnt_sigmask);
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EXPORT_SYMBOL(rpc_clnt_sigunmask);
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EXPORT_SYMBOL(rpc_delay);
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EXPORT_SYMBOL(rpc_restart_call);
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EXPORT_SYMBOL(rpc_setbufsize);
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EXPORT_SYMBOL(rpc_unlink);
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EXPORT_SYMBOL(rpc_wake_up);
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EXPORT_SYMBOL(rpc_queue_upcall);
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EXPORT_SYMBOL(rpc_mkpipe);
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/* Client transport */
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EXPORT_SYMBOL(xprt_create_proto);
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EXPORT_SYMBOL(xprt_set_timeout);
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EXPORT_SYMBOL(xprt_udp_slot_table_entries);
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EXPORT_SYMBOL(xprt_tcp_slot_table_entries);
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/* Client credential cache */
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EXPORT_SYMBOL(rpcauth_register);
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EXPORT_SYMBOL(rpcauth_unregister);
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EXPORT_SYMBOL(rpcauth_create);
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EXPORT_SYMBOL(rpcauth_lookupcred);
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EXPORT_SYMBOL(rpcauth_lookup_credcache);
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EXPORT_SYMBOL(rpcauth_free_credcache);
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EXPORT_SYMBOL(rpcauth_init_credcache);
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EXPORT_SYMBOL(put_rpccred);
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/* RPC server stuff */
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EXPORT_SYMBOL(svc_create);
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EXPORT_SYMBOL(svc_create_thread);
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EXPORT_SYMBOL(svc_exit_thread);
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EXPORT_SYMBOL(svc_destroy);
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EXPORT_SYMBOL(svc_drop);
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EXPORT_SYMBOL(svc_process);
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EXPORT_SYMBOL(svc_recv);
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EXPORT_SYMBOL(svc_wake_up);
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EXPORT_SYMBOL(svc_makesock);
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EXPORT_SYMBOL(svc_reserve);
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EXPORT_SYMBOL(svc_auth_register);
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EXPORT_SYMBOL(auth_domain_lookup);
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EXPORT_SYMBOL(svc_authenticate);
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EXPORT_SYMBOL(svc_set_client);
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/* RPC statistics */
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#ifdef CONFIG_PROC_FS
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EXPORT_SYMBOL(rpc_proc_register);
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EXPORT_SYMBOL(rpc_proc_unregister);
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EXPORT_SYMBOL(svc_proc_register);
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EXPORT_SYMBOL(svc_proc_unregister);
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EXPORT_SYMBOL(svc_seq_show);
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#endif
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/* caching... */
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EXPORT_SYMBOL(auth_domain_find);
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EXPORT_SYMBOL(auth_domain_put);
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EXPORT_SYMBOL(auth_unix_add_addr);
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EXPORT_SYMBOL(auth_unix_forget_old);
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EXPORT_SYMBOL(auth_unix_lookup);
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EXPORT_SYMBOL(cache_check);
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EXPORT_SYMBOL(cache_flush);
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EXPORT_SYMBOL(cache_purge);
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EXPORT_SYMBOL(cache_fresh);
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EXPORT_SYMBOL(cache_init);
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EXPORT_SYMBOL(cache_register);
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EXPORT_SYMBOL(cache_unregister);
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EXPORT_SYMBOL(qword_add);
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EXPORT_SYMBOL(qword_addhex);
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EXPORT_SYMBOL(qword_get);
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EXPORT_SYMBOL(svcauth_unix_purge);
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EXPORT_SYMBOL(unix_domain_find);
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/* Generic XDR */
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EXPORT_SYMBOL(xdr_encode_string);
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EXPORT_SYMBOL(xdr_decode_string);
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EXPORT_SYMBOL(xdr_decode_string_inplace);
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EXPORT_SYMBOL(xdr_decode_netobj);
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EXPORT_SYMBOL(xdr_encode_netobj);
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EXPORT_SYMBOL(xdr_encode_pages);
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EXPORT_SYMBOL(xdr_inline_pages);
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EXPORT_SYMBOL(xdr_shift_buf);
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EXPORT_SYMBOL(xdr_encode_word);
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EXPORT_SYMBOL(xdr_decode_word);
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EXPORT_SYMBOL(xdr_encode_array2);
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EXPORT_SYMBOL(xdr_decode_array2);
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EXPORT_SYMBOL(xdr_buf_from_iov);
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EXPORT_SYMBOL(xdr_buf_subsegment);
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EXPORT_SYMBOL(xdr_buf_read_netobj);
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EXPORT_SYMBOL(read_bytes_from_xdr_buf);
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/* Debugging symbols */
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#ifdef RPC_DEBUG
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EXPORT_SYMBOL(rpc_debug);
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EXPORT_SYMBOL(nfs_debug);
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EXPORT_SYMBOL(nfsd_debug);
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EXPORT_SYMBOL(nlm_debug);
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#endif
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extern int register_rpc_pipefs(void);
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extern void unregister_rpc_pipefs(void);
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static int __init
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init_sunrpc(void)
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{
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int err = register_rpc_pipefs();
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if (err)
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goto out;
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err = rpc_init_mempool() != 0;
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if (err)
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goto out;
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#ifdef RPC_DEBUG
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rpc_register_sysctl();
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#endif
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#ifdef CONFIG_PROC_FS
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rpc_proc_init();
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#endif
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cache_register(&auth_domain_cache);
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cache_register(&ip_map_cache);
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out:
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return err;
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}
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static void __exit
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cleanup_sunrpc(void)
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{
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unregister_rpc_pipefs();
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rpc_destroy_mempool();
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if (cache_unregister(&auth_domain_cache))
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printk(KERN_ERR "sunrpc: failed to unregister auth_domain cache\n");
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if (cache_unregister(&ip_map_cache))
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printk(KERN_ERR "sunrpc: failed to unregister ip_map cache\n");
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#ifdef RPC_DEBUG
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rpc_unregister_sysctl();
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#endif
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#ifdef CONFIG_PROC_FS
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rpc_proc_exit();
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#endif
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}
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MODULE_LICENSE("GPL");
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module_init(init_sunrpc);
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module_exit(cleanup_sunrpc);
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