diff options
| -rw-r--r-- | fs/sysfs/mount.c | 12 | ||||
| -rw-r--r-- | include/linux/kobject_ns.h | 2 | ||||
| -rw-r--r-- | lib/kobject.c | 15 | ||||
| -rw-r--r-- | net/core/net-sysfs.c | 8 |
4 files changed, 34 insertions, 3 deletions
diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c index 4a2da3a..8c69ef4 100644 --- a/fs/sysfs/mount.c +++ b/fs/sysfs/mount.c @@ -112,9 +112,15 @@ static struct dentry *sysfs_mount(struct file_system_type *fs_type, struct super_block *sb; int error; - if (!(flags & MS_KERNMOUNT) && !capable(CAP_SYS_ADMIN) && - !fs_fully_visible(fs_type)) - return ERR_PTR(-EPERM); + if (!(flags & MS_KERNMOUNT)) { + if (!capable(CAP_SYS_ADMIN) && !fs_fully_visible(fs_type)) + return ERR_PTR(-EPERM); + + for (type = KOBJ_NS_TYPE_NONE; type < KOBJ_NS_TYPES; type++) { + if (!kobj_ns_current_may_mount(type)) + return ERR_PTR(-EPERM); + } + } info = kzalloc(sizeof(*info), GFP_KERNEL); if (!info) diff --git a/include/linux/kobject_ns.h b/include/linux/kobject_ns.h index f66b065..df32d25 100644 --- a/include/linux/kobject_ns.h +++ b/include/linux/kobject_ns.h @@ -39,6 +39,7 @@ enum kobj_ns_type { */ struct kobj_ns_type_operations { enum kobj_ns_type type; + bool (*current_may_mount)(void); void *(*grab_current_ns)(void); const void *(*netlink_ns)(struct sock *sk); const void *(*initial_ns)(void); @@ -50,6 +51,7 @@ int kobj_ns_type_registered(enum kobj_ns_type type); const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent); const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj); +bool kobj_ns_current_may_mount(enum kobj_ns_type type); void *kobj_ns_grab_current(enum kobj_ns_type type); const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk); const void *kobj_ns_initial(enum kobj_ns_type type); diff --git a/lib/kobject.c b/lib/kobject.c index 4a1f33d..3bbde22 100644 --- a/lib/kobject.c +++ b/lib/kobject.c @@ -915,6 +915,21 @@ const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj) return kobj_child_ns_ops(kobj->parent); } +bool kobj_ns_current_may_mount(enum kobj_ns_type type) +{ + bool may_mount = false; + + if (type == KOBJ_NS_TYPE_NONE) + return true; + + spin_lock(&kobj_ns_type_lock); + if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) && + kobj_ns_ops_tbl[type]) + may_mount = kobj_ns_ops_tbl[type]->current_may_mount(); + spin_unlock(&kobj_ns_type_lock); + + return may_mount; +} void *kobj_ns_grab_current(enum kobj_ns_type type) { diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c index 981fed3..9bd9ae1 100644 --- a/net/core/net-sysfs.c +++ b/net/core/net-sysfs.c @@ -1157,6 +1157,13 @@ static void remove_queue_kobjects(struct net_device *net) #endif } +static bool net_current_may_mount(void) +{ + struct net *net = current->nsproxy->net_ns; + + return ns_capable(net->user_ns, CAP_SYS_ADMIN); +} + static void *net_grab_current_ns(void) { struct net *ns = current->nsproxy->net_ns; @@ -1179,6 +1186,7 @@ static const void *net_netlink_ns(struct sock *sk) struct kobj_ns_type_operations net_ns_type_operations = { .type = KOBJ_NS_TYPE_NET, + .current_may_mount = net_current_may_mount, .grab_current_ns = net_grab_current_ns, .netlink_ns = net_netlink_ns, .initial_ns = net_initial_ns, |
