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authorAlexey Dobriyan <adobriyan@gmail.com>2009-03-25 22:48:06 +0300
committerAlexey Dobriyan <adobriyan@gmail.com>2009-03-31 01:14:44 +0400
commit99b76233803beab302123d243eea9e41149804f3 (patch)
tree398178210fe66845ccd6fa4258ba762a87e023ad /net
parent3dec7f59c370c7b58184d63293c3dc984d475840 (diff)
downloadlinux-2.6.38-lt-ux500-99b76233803beab302123d243eea9e41149804f3.tar.gz
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>
Diffstat (limited to 'net')
-rw-r--r--net/appletalk/atalk_proc.c1
-rw-r--r--net/atm/mpoa_proc.c1
-rw-r--r--net/atm/proc.c1
-rw-r--r--net/can/bcm.c4
-rw-r--r--net/can/proc.c2
-rw-r--r--net/core/pktgen.c1
-rw-r--r--net/irda/irproc.c1
-rw-r--r--net/llc/llc_proc.c1
-rw-r--r--net/sctp/protocol.c8
-rw-r--r--net/sunrpc/cache.c4
-rw-r--r--net/sunrpc/stats.c10
11 files changed, 4 insertions, 30 deletions
diff --git a/net/appletalk/atalk_proc.c b/net/appletalk/atalk_proc.c
index 162199a2d74..fd8e0847b25 100644
--- a/net/appletalk/atalk_proc.c
+++ b/net/appletalk/atalk_proc.c
@@ -281,7 +281,6 @@ int __init atalk_proc_init(void)
atalk_proc_dir = proc_mkdir("atalk", init_net.proc_net);
if (!atalk_proc_dir)
goto out;
- atalk_proc_dir->owner = THIS_MODULE;
p = proc_create("interface", S_IRUGO, atalk_proc_dir,
&atalk_seq_interface_fops);
diff --git a/net/atm/mpoa_proc.c b/net/atm/mpoa_proc.c
index 4990541ef5d..1a0f5ccea9c 100644
--- a/net/atm/mpoa_proc.c
+++ b/net/atm/mpoa_proc.c
@@ -281,7 +281,6 @@ int mpc_proc_init(void)
printk(KERN_ERR "Unable to initialize /proc/atm/%s\n", STAT_FILE_NAME);
return -ENOMEM;
}
- p->owner = THIS_MODULE;
return 0;
}
diff --git a/net/atm/proc.c b/net/atm/proc.c
index 49487b313f2..e7b3b273907 100644
--- a/net/atm/proc.c
+++ b/net/atm/proc.c
@@ -476,7 +476,6 @@ int __init atm_proc_init(void)
atm_proc_root, e->proc_fops);
if (!dirent)
goto err_out_remove;
- dirent->owner = THIS_MODULE;
e->dirent = dirent;
}
ret = 0;
diff --git a/net/can/bcm.c b/net/can/bcm.c
index b7c7d465113..95d7f32643a 100644
--- a/net/can/bcm.c
+++ b/net/can/bcm.c
@@ -1604,10 +1604,6 @@ static int __init bcm_module_init(void)
/* create /proc/net/can-bcm directory */
proc_dir = proc_mkdir("can-bcm", init_net.proc_net);
-
- if (proc_dir)
- proc_dir->owner = THIS_MODULE;
-
return 0;
}
diff --git a/net/can/proc.c b/net/can/proc.c
index 520fef5e539..1463653dbe3 100644
--- a/net/can/proc.c
+++ b/net/can/proc.c
@@ -473,8 +473,6 @@ void can_init_proc(void)
return;
}
- can_dir->owner = THIS_MODULE;
-
/* own procfs entries from the AF_CAN core */
pde_version = can_create_proc_readentry(CAN_PROC_VERSION, 0644,
can_proc_read_version, NULL);
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 32d419f5ac9..3779c1438c1 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -3806,7 +3806,6 @@ static int __init pg_init(void)
pg_proc_dir = proc_mkdir(PG_PROC_DIR, init_net.proc_net);
if (!pg_proc_dir)
return -ENODEV;
- pg_proc_dir->owner = THIS_MODULE;
pe = proc_create(PGCTRL, 0600, pg_proc_dir, &pktgen_fops);
if (pe == NULL) {
diff --git a/net/irda/irproc.c b/net/irda/irproc.c
index 88e80a31273..8ff1861649e 100644
--- a/net/irda/irproc.c
+++ b/net/irda/irproc.c
@@ -70,7 +70,6 @@ void __init irda_proc_register(void)
proc_irda = proc_mkdir("irda", init_net.proc_net);
if (proc_irda == NULL)
return;
- proc_irda->owner = THIS_MODULE;
for (i = 0; i < ARRAY_SIZE(irda_dirs); i++)
d = proc_create(irda_dirs[i].name, 0, proc_irda,
diff --git a/net/llc/llc_proc.c b/net/llc/llc_proc.c
index b58bd7c6cdf..d208b3396d9 100644
--- a/net/llc/llc_proc.c
+++ b/net/llc/llc_proc.c
@@ -236,7 +236,6 @@ int __init llc_proc_init(void)
llc_proc_dir = proc_mkdir("llc", init_net.proc_net);
if (!llc_proc_dir)
goto out;
- llc_proc_dir->owner = THIS_MODULE;
p = proc_create("socket", S_IRUGO, llc_proc_dir, &llc_seq_socket_fops);
if (!p)
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index cb198af8887..8eb3e61cb70 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -106,12 +106,8 @@ static __init int sctp_proc_init(void)
goto out_nomem;
#ifdef CONFIG_PROC_FS
if (!proc_net_sctp) {
- struct proc_dir_entry *ent;
- ent = proc_mkdir("sctp", init_net.proc_net);
- if (ent) {
- ent->owner = THIS_MODULE;
- proc_net_sctp = ent;
- } else
+ proc_net_sctp = proc_mkdir("sctp", init_net.proc_net);
+ if (!proc_net_sctp)
goto out_free_percpu;
}
diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index 4735caad26e..20029a79a5d 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -313,7 +313,6 @@ static int create_cache_proc_entries(struct cache_detail *cd)
cd->proc_ent = proc_mkdir(cd->name, proc_net_rpc);
if (cd->proc_ent == NULL)
goto out_nomem;
- cd->proc_ent->owner = cd->owner;
cd->channel_ent = cd->content_ent = NULL;
p = proc_create_data("flush", S_IFREG|S_IRUSR|S_IWUSR,
@@ -321,7 +320,6 @@ static int create_cache_proc_entries(struct cache_detail *cd)
cd->flush_ent = p;
if (p == NULL)
goto out_nomem;
- p->owner = cd->owner;
if (cd->cache_request || cd->cache_parse) {
p = proc_create_data("channel", S_IFREG|S_IRUSR|S_IWUSR,
@@ -329,7 +327,6 @@ static int create_cache_proc_entries(struct cache_detail *cd)
cd->channel_ent = p;
if (p == NULL)
goto out_nomem;
- p->owner = cd->owner;
}
if (cd->cache_show) {
p = proc_create_data("content", S_IFREG|S_IRUSR|S_IWUSR,
@@ -337,7 +334,6 @@ static int create_cache_proc_entries(struct cache_detail *cd)
cd->content_ent = p;
if (p == NULL)
goto out_nomem;
- p->owner = cd->owner;
}
return 0;
out_nomem:
diff --git a/net/sunrpc/stats.c b/net/sunrpc/stats.c
index 085372ef4fe..1ef6e46d9da 100644
--- a/net/sunrpc/stats.c
+++ b/net/sunrpc/stats.c
@@ -262,14 +262,8 @@ void
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