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| author | Denis V. Lunev <den@openvz.org> | 2008-01-10 03:51:41 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-01-28 15:01:36 -0800 |
| commit | e5d69b9f4a6ce17f0d09595da45e37b870fee5ae (patch) | |
| tree | fa6ddbf9a5dbf674e8c7ec668edec2f36d34176a | |
| parent | 8cced9eff1d413c28efac9c5ac5a75793c9251cf (diff) | |
| download | linux-3.10-e5d69b9f4a6ce17f0d09595da45e37b870fee5ae.tar.gz linux-3.10-e5d69b9f4a6ce17f0d09595da45e37b870fee5ae.tar.bz2 linux-3.10-e5d69b9f4a6ce17f0d09595da45e37b870fee5ae.zip | |
[ATM]: Oops reading net/atm/arp
cat /proc/net/atm/arp causes the NULL pointer dereference in the
get_proc_net+0xc/0x3a. This happens as proc_get_net believes that the
parent proc dir entry contains struct net.
Fix this assumption for "net/atm" case.
The problem is introduced by the commit c0097b07abf5f92ab135d024dd41bd2aada1512f
from Eric W. Biederman/Daniel Lezcano.
Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | fs/proc/proc_net.c | 17 | ||||
| -rw-r--r-- | include/linux/proc_fs.h | 2 | ||||
| -rw-r--r-- | net/atm/proc.c | 4 |
3 files changed, 17 insertions, 6 deletions
diff --git a/fs/proc/proc_net.c b/fs/proc/proc_net.c index cfc4f6c072f..4823c9677fa 100644 --- a/fs/proc/proc_net.c +++ b/fs/proc/proc_net.c @@ -96,6 +96,17 @@ static struct proc_dir_entry *proc_net_shadow(struct task_struct *task, return task->nsproxy->net_ns->proc_net; } +struct proc_dir_entry *proc_net_mkdir(struct net *net, const char *name, + struct proc_dir_entry *parent) +{ + struct proc_dir_entry *pde; + pde = proc_mkdir_mode(name, S_IRUGO | S_IXUGO, parent); + if (pde != NULL) + pde->data = net; + return pde; +} +EXPORT_SYMBOL_GPL(proc_net_mkdir); + static __net_init int proc_net_ns_init(struct net *net) { struct proc_dir_entry *root, *netd, *net_statd; @@ -107,18 +118,16 @@ static __net_init int proc_net_ns_init(struct net *net) goto out; err = -EEXIST; - netd = proc_mkdir("net", root); + netd = proc_net_mkdir(net, "net", root); if (!netd) goto free_root; err = -EEXIST; - net_statd = proc_mkdir("stat", netd); + net_statd = proc_net_mkdir(net, "stat", netd); if (!net_statd) goto free_net; root->data = net; - netd->data = net; - net_statd->data = net; net->proc_net_root = root; net->proc_net = netd; diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h index a5316829215..8f92546b403 100644 --- a/include/linux/proc_fs.h +++ b/include/linux/proc_fs.h @@ -201,6 +201,8 @@ static inline struct proc_dir_entry *create_proc_info_entry(const char *name, extern struct proc_dir_entry *proc_net_fops_create(struct net *net, const char *name, mode_t mode, const struct file_operations *fops); extern void proc_net_remove(struct net *net, const char *name); +extern struct proc_dir_entry *proc_net_mkdir(struct net *net, const char *name, + struct proc_dir_entry *parent); #else diff --git a/net/atm/proc.c b/net/atm/proc.c index 5d9d5ffba14..565e75e62ca 100644 --- a/net/atm/proc.c +++ b/net/atm/proc.c @@ -476,7 +476,7 @@ static void atm_proc_dirs_remove(void) if (e->dirent) remove_proc_entry(e->name, atm_proc_root); } - remove_proc_entry("atm", init_net.proc_net); + proc_net_remove(&init_net, "atm"); } int __init atm_proc_init(void) @@ -484,7 +484,7 @@ int __init atm_proc_init(void) static struct atm_proc_entry *e; int ret; - atm_proc_root = proc_mkdir("atm", init_net.proc_net); + atm_proc_root = proc_net_mkdir(&init_net, "atm", init_net.proc_net); if (!atm_proc_root) goto err_out; for (e = atm_proc_ents; e->name; e++) { |