From f35279d3f713e5c97b98cbdbf47d98f79942c11f Mon Sep 17 00:00:00 2001 From: Bruce Allan Date: Tue, 6 Sep 2005 15:17:08 -0700 Subject: [PATCH] [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./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 Cc: Trond Myklebust Cc: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/nfsd/export.c | 3 +++ fs/nfsd/nfs4idmap.c | 8 ++++++-- include/linux/sunrpc/cache.h | 1 + net/sunrpc/auth_gss/svcauth_gss.c | 8 ++++++-- net/sunrpc/cache.c | 8 ++++---- net/sunrpc/sunrpc_syms.c | 6 ++++-- net/sunrpc/svcauth.c | 1 + net/sunrpc/svcauth_unix.c | 1 + 8 files changed, 26 insertions(+), 10 deletions(-) diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c index 9a11aa3..057aff7 100644 --- a/fs/nfsd/export.c +++ b/fs/nfsd/export.c @@ -26,6 +26,7 @@ #include #include #include +#include #include #include @@ -221,6 +222,7 @@ static int expkey_show(struct seq_file *m, } struct cache_detail svc_expkey_cache = { + .owner = THIS_MODULE, .hash_size = EXPKEY_HASHMAX, .hash_table = expkey_table, .name = "nfsd.fh", @@ -456,6 +458,7 @@ static int svc_export_show(struct seq_file *m, return 0; } struct cache_detail svc_export_cache = { + .owner = THIS_MODULE, .hash_size = EXPORT_HASHMAX, .hash_table = export_table, .name = "nfsd.export", diff --git a/fs/nfsd/nfs4idmap.c b/fs/nfsd/nfs4idmap.c index 5605a26..1336965 100644 --- a/fs/nfsd/nfs4idmap.c +++ b/fs/nfsd/nfs4idmap.c @@ -187,6 +187,7 @@ static int idtoname_parse(struct cache_detail *, char *, int); static struct ent *idtoname_lookup(struct ent *, int); static struct cache_detail idtoname_cache = { + .owner = THIS_MODULE, .hash_size = ENT_HASHMAX, .hash_table = idtoname_table, .name = "nfs4.idtoname", @@ -320,6 +321,7 @@ static struct ent *nametoid_lookup(struct ent *, int); static int nametoid_parse(struct cache_detail *, char *, int); static struct cache_detail nametoid_cache = { + .owner = THIS_MODULE, .hash_size = ENT_HASHMAX, .hash_table = nametoid_table, .name = "nfs4.nametoid", @@ -404,8 +406,10 @@ nfsd_idmap_init(void) void nfsd_idmap_shutdown(void) { - cache_unregister(&idtoname_cache); - cache_unregister(&nametoid_cache); + if (cache_unregister(&idtoname_cache)) + printk(KERN_ERR "nfsd: failed to unregister idtoname cache\n"); + if (cache_unregister(&nametoid_cache)) + printk(KERN_ERR "nfsd: failed to unregister nametoid cache\n"); } /* diff --git a/include/linux/sunrpc/cache.h b/include/linux/sunrpc/cache.h index 6864063..c4e3ea7 100644 --- a/include/linux/sunrpc/cache.h +++ b/include/linux/sunrpc/cache.h @@ -60,6 +60,7 @@ struct cache_head { #define CACHE_NEW_EXPIRY 120 /* keep new things pending confirmation for 120 seconds */ struct cache_detail { + struct module * owner; int hash_size; struct cache_head ** hash_table; rwlock_t hash_lock; diff --git a/net/sunrpc/auth_gss/svcauth_gss.c b/net/sunrpc/auth_gss/svcauth_gss.c index 5c8fe3b..e330819 100644 --- a/net/sunrpc/auth_gss/svcauth_gss.c +++ b/net/sunrpc/auth_gss/svcauth_gss.c @@ -250,6 +250,7 @@ out: } static struct cache_detail rsi_cache = { + .owner = THIS_MODULE, .hash_size = RSI_HASHMAX, .hash_table = rsi_table, .name = "auth.rpcsec.init", @@ -436,6 +437,7 @@ out: } static struct cache_detail rsc_cache = { + .owner = THIS_MODULE, .hash_size = RSC_HASHMAX, .hash_table = rsc_table, .name = "auth.rpcsec.context", @@ -1074,7 +1076,9 @@ gss_svc_init(void) void gss_svc_shutdown(void) { - cache_unregister(&rsc_cache); - cache_unregister(&rsi_cache); + if (cache_unregister(&rsc_cache)) + printk(KERN_ERR "auth_rpcgss: failed to unregister rsc cache\n"); + if (cache_unregister(&rsi_cache)) + printk(KERN_ERR "auth_rpcgss: failed to unregister rsi cache\n"); svc_auth_unregister(RPC_AUTH_GSS); } diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index 900f5bc..f509e99 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -177,7 +177,7 @@ void cache_register(struct cache_detail *cd) cd->proc_ent = proc_mkdir(cd->name, proc_net_rpc); if (cd->proc_ent) { struct proc_dir_entry *p; - cd->proc_ent->owner = THIS_MODULE; + cd->proc_ent->owner = cd->owner; cd->channel_ent = cd->content_ent = NULL; p = create_proc_entry("flush", S_IFREG|S_IRUSR|S_IWUSR, @@ -185,7 +185,7 @@ void cache_register(struct cache_detail *cd) cd->flush_ent = p; if (p) { p->proc_fops = &cache_flush_operations; - p->owner = THIS_MODULE; + p->owner = cd->owner; p->data = cd; } @@ -195,7 +195,7 @@ void cache_register(struct cache_detail *cd) cd->channel_ent = p; if (p) { p->proc_fops = &cache_file_operations; - p->owner = THIS_MODULE; + p->owner = cd->owner; p->data = cd; } } @@ -205,7 +205,7 @@ void cache_register(struct cache_detail *cd) cd->content_ent = p; if (p) { p->proc_fops = &content_file_operations; - p->owner = THIS_MODULE; + p->owner = cd->owner; p->data = cd; } } diff --git a/net/sunrpc/sunrpc_syms.c b/net/sunrpc/sunrpc_syms.c index 62a0734..ed48ff0 100644 --- a/net/sunrpc/sunrpc_syms.c +++ b/net/sunrpc/sunrpc_syms.c @@ -176,8 +176,10 @@ cleanup_sunrpc(void) { unregister_rpc_pipefs(); rpc_destroy_mempool(); - cache_unregister(&auth_domain_cache); - cache_unregister(&ip_map_cache); + 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 diff --git a/net/sunrpc/svcauth.c b/net/sunrpc/svcauth.c index bde8147..dda4f0c 100644 --- a/net/sunrpc/svcauth.c +++ b/net/sunrpc/svcauth.c @@ -143,6 +143,7 @@ static void auth_domain_drop(struct cache_head *item, struct cache_detail *cd) struct cache_detail auth_domain_cache = { + .owner = THIS_MODULE, .hash_size = DN_HASHMAX, .hash_table = auth_domain_table, .name = "auth.domain", diff --git a/net/sunrpc/svcauth_unix.c b/net/sunrpc/svcauth_unix.c index d6baf6f..cac2e77 100644 --- a/net/sunrpc/svcauth_unix.c +++ b/net/sunrpc/svcauth_unix.c @@ -242,6 +242,7 @@ static int ip_map_show(struct seq_file *m, struct cache_detail ip_map_cache = { + .owner = THIS_MODULE, .hash_size = IP_HASHMAX, .hash_table = ip_table, .name = "auth.unix.ip", -- 1.8.2.3