proc 2/2: remove struct proc_dir_entry::owner
Setting ->owner as done currently (pde->owner = THIS_MODULE) is racy
as correctly noted at bug #12454. Someone can lookup entry with NULL
->owner, thus not pinning enything, and release it later resulting
in module refcount underflow.
We can keep ->owner and supply it at registration time like ->proc_fops
and ->data.
But this leaves ->owner as easy-manipulative field (just one C assignment)
and somebody will forget to unpin previous/pin current module when
switching ->owner. ->proc_fops is declared as "const" which should give
some thoughts.
->read_proc/->write_proc were just fixed to not require ->owner for
protection.
rmmod'ed directories will be empty and return "." and ".." -- no harm.
And directories with tricky enough readdir and lookup shouldn't be modular.
We definitely don't want such modular code.
Removing ->owner will also make PDE smaller.
So, let's nuke it.
Kudos to Jeff Layton for reminding about this, let's say, oversight.
http://bugzilla.kernel.org/show_bug.cgi?id=12454
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
diff --git a/net/sunrpc/stats.c b/net/sunrpc/stats.c
index 085372e..1ef6e46 100644
--- a/net/sunrpc/stats.c
+++ b/net/sunrpc/stats.c
@@ -262,14 +262,8 @@
rpc_proc_init(void)
{
dprintk("RPC: registering /proc/net/rpc\n");
- if (!proc_net_rpc) {
- struct proc_dir_entry *ent;
- ent = proc_mkdir("rpc", init_net.proc_net);
- if (ent) {
- ent->owner = THIS_MODULE;
- proc_net_rpc = ent;
- }
- }
+ if (!proc_net_rpc)
+ proc_net_rpc = proc_mkdir("rpc", init_net.proc_net);
}
void