linux/net/sunrpc
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
..
auth_gss [PATCH] sunrpc: cache_register can use wrong module reference 2005-09-07 16:57:25 -07:00
Makefile Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
auth.c [PATCH] RPC: [PATCH] improve rpcauthauth_create error returns 2005-06-22 16:07:16 -04:00
auth_null.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
auth_unix.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cache.c [PATCH] sunrpc: cache_register can use wrong module reference 2005-09-07 16:57:25 -07:00
clnt.c [PATCH] RPC: Ensure rpc calls respects the RPC_NOINTR flag 2005-06-22 16:07:30 -04:00
pmap_clnt.c [PATCH] RPC: Allow multiple RPC client programs to share the same transport 2005-06-22 16:07:18 -04:00
rpc_pipe.c [PATCH] remove driverfs references from include/linux/cpu.h and net/sunrpc/rpc_pipe.c 2005-09-02 00:57:31 -07:00
sched.c [NET]: use __read_mostly on kmem_cache_t , DEFINE_SNMP_STAT pointers 2005-08-29 16:11:18 -07:00
stats.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sunrpc_syms.c [PATCH] sunrpc: cache_register can use wrong module reference 2005-09-07 16:57:25 -07:00
svc.c [PATCH] RPC: Allow the sunrpc server to multiplex serveral programs on a single port 2005-06-22 16:07:22 -04:00
svcauth.c [PATCH] sunrpc: cache_register can use wrong module reference 2005-09-07 16:57:25 -07:00
svcauth_unix.c [PATCH] sunrpc: cache_register can use wrong module reference 2005-09-07 16:57:25 -07:00
svcsock.c [NET]: Store skb->timestamp as offset to a base timestamp 2005-08-29 15:58:24 -07:00
sysctl.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
timer.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
xdr.c [PATCH] NFS: Ensure ACL xdr code doesn't overflow. 2005-08-16 08:52:11 -07:00
xprt.c [PATCH] coverity: sunrpc/xprt task null check 2005-07-07 18:23:47 -07:00