[PATCH 1/2] namespaces: give each namespace a serial number
From: Richard Guy Briggs
Date: Tue Apr 22 2014 - 14:14:29 EST
Assign a serial number per namespace since boot.
Signed-off-by: Richard Guy Briggs <rgb@xxxxxxxxxx>
---
fs/mount.h | 1 +
fs/namespace.c | 1 +
include/linux/ipc_namespace.h | 1 +
include/linux/nsproxy.h | 8 ++++++++
include/linux/pid_namespace.h | 1 +
include/linux/user_namespace.h | 1 +
include/linux/utsname.h | 1 +
include/net/net_namespace.h | 1 +
init/version.c | 1 +
ipc/msgutil.c | 1 +
ipc/namespace.c | 2 ++
kernel/nsproxy.c | 24 ++++++++++++++++++++++++
kernel/pid.c | 1 +
kernel/pid_namespace.c | 2 ++
kernel/user.c | 1 +
kernel/user_namespace.c | 2 ++
kernel/utsname.c | 2 ++
net/core/net_namespace.c | 4 +++-
18 files changed, 54 insertions(+), 1 deletions(-)
diff --git a/fs/mount.h b/fs/mount.h
index b29e42f..23d041b 100644
--- a/fs/mount.h
+++ b/fs/mount.h
@@ -5,6 +5,7 @@
struct mnt_namespace {
atomic_t count;
unsigned int proc_inum;
+ unsigned int serial_num;
struct mount * root;
struct list_head list;
struct user_namespace *user_ns;
diff --git a/fs/namespace.c b/fs/namespace.c
index 2ffc5a2..b4a31aa 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2472,6 +2472,7 @@ static struct mnt_namespace *alloc_mnt_ns(struct user_namespace *user_ns)
kfree(new_ns);
return ERR_PTR(ret);
}
+ new_ns->serial_num = ns_serial();
new_ns->seq = atomic64_add_return(1, &mnt_ns_seq);
atomic_set(&new_ns->count, 1);
new_ns->root = NULL;
diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h
index 35e7eca..ee1444f 100644
--- a/include/linux/ipc_namespace.h
+++ b/include/linux/ipc_namespace.h
@@ -69,6 +69,7 @@ struct ipc_namespace {
struct user_namespace *user_ns;
unsigned int proc_inum;
+ unsigned int serial_num;
};
extern struct ipc_namespace init_ipc_ns;
diff --git a/include/linux/nsproxy.h b/include/linux/nsproxy.h
index b4ec59d..12e1250 100644
--- a/include/linux/nsproxy.h
+++ b/include/linux/nsproxy.h
@@ -66,6 +66,14 @@ static inline struct nsproxy *task_nsproxy(struct task_struct *tsk)
return rcu_dereference(tsk->nsproxy);
}
+unsigned int ns_serial(void);
+enum {
+ NS_IPC_INIT_SN = 1,
+ NS_UTS_INIT_SN = 2,
+ NS_USER_INIT_SN = 3,
+ NS_PID_INIT_SN = 4,
+};
+
int copy_namespaces(unsigned long flags, struct task_struct *tsk);
void exit_task_namespaces(struct task_struct *tsk);
void switch_task_namespaces(struct task_struct *tsk, struct nsproxy *new);
diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
index 7246ef3..4606e8c 100644
--- a/include/linux/pid_namespace.h
+++ b/include/linux/pid_namespace.h
@@ -43,6 +43,7 @@ struct pid_namespace {
int hide_pid;
int reboot; /* group exit code if this pidns was rebooted */
unsigned int proc_inum;
+ unsigned int serial_num;
};
extern struct pid_namespace init_pid_ns;
diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h
index 4836ba3..c70ed6b 100644
--- a/include/linux/user_namespace.h
+++ b/include/linux/user_namespace.h
@@ -27,6 +27,7 @@ struct user_namespace {
kuid_t owner;
kgid_t group;
unsigned int proc_inum;
+ unsigned int serial_num;
/* Register of per-UID persistent keyrings for this namespace */
#ifdef CONFIG_PERSISTENT_KEYRINGS
diff --git a/include/linux/utsname.h b/include/linux/utsname.h
index 239e277..ccee588 100644
--- a/include/linux/utsname.h
+++ b/include/linux/utsname.h
@@ -24,6 +24,7 @@ struct uts_namespace {
struct new_utsname name;
struct user_namespace *user_ns;
unsigned int proc_inum;
+ unsigned int serial_num;
};
extern struct uts_namespace init_uts_ns;
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 991dcd9..1d2e2a5 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -59,6 +59,7 @@ struct net {
struct user_namespace *user_ns; /* Owning user namespace */
unsigned int proc_inum;
+ unsigned int serial_num;
struct proc_dir_entry *proc_net;
struct proc_dir_entry *proc_net_stat;
diff --git a/init/version.c b/init/version.c
index 1a4718e..cfdcb85 100644
--- a/init/version.c
+++ b/init/version.c
@@ -36,6 +36,7 @@ struct uts_namespace init_uts_ns = {
},
.user_ns = &init_user_ns,
.proc_inum = PROC_UTS_INIT_INO,
+ .serial_num = NS_UTS_INIT_SN /* ns_serial() */,
};
EXPORT_SYMBOL_GPL(init_uts_ns);
diff --git a/ipc/msgutil.c b/ipc/msgutil.c
index 7e70959..9aa66ae 100644
--- a/ipc/msgutil.c
+++ b/ipc/msgutil.c
@@ -32,6 +32,7 @@ struct ipc_namespace init_ipc_ns = {
.count = ATOMIC_INIT(1),
.user_ns = &init_user_ns,
.proc_inum = PROC_IPC_INIT_INO,
+ .serial_num = NS_IPC_INIT_SN /* ns_serial() */,
};
atomic_t nr_ipc_ns = ATOMIC_INIT(1);
diff --git a/ipc/namespace.c b/ipc/namespace.c
index 59451c1..76dac5c 100644
--- a/ipc/namespace.c
+++ b/ipc/namespace.c
@@ -41,6 +41,8 @@ static struct ipc_namespace *create_ipc_ns(struct user_namespace *user_ns,
}
atomic_inc(&nr_ipc_ns);
+ ns->serial_num = ns_serial();
+
sem_init_ns(ns);
msg_init_ns(ns);
shm_init_ns(ns);
diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index 8e78110..212fa63 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -41,6 +41,30 @@ struct nsproxy init_nsproxy = {
#endif
};
+/**
+ * ns_serial - compute a serial number for the namespace
+ *
+ * Compute a serial number for the namespace to uniquely identify it in
+ * audit records.
+ */
+unsigned int ns_serial(void)
+{
+ static DEFINE_SPINLOCK(serial_lock);
+ static unsigned int serial = 4; /* reserved for IPC, UTS, user, PID */
+
+ unsigned long flags;
+ unsigned int ret;
+
+ spin_lock_irqsave(&serial_lock, flags);
+ do {
+ ret = ++serial;
+ } while (unlikely(!ret));
+ spin_unlock_irqrestore(&serial_lock, flags);
+
+ return ret;
+}
+
+
static inline struct nsproxy *create_nsproxy(void)
{
struct nsproxy *nsproxy;
diff --git a/kernel/pid.c b/kernel/pid.c
index 9b9a266..3bf7127 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -80,6 +80,7 @@ struct pid_namespace init_pid_ns = {
.child_reaper = &init_task,
.user_ns = &init_user_ns,
.proc_inum = PROC_PID_INIT_INO,
+ .serial_num = NS_PID_INIT_SN /* ns_serial() */,
};
EXPORT_SYMBOL_GPL(init_pid_ns);
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index 06c62de..c24f207 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -109,6 +109,8 @@ static struct pid_namespace *create_pid_namespace(struct user_namespace *user_ns
if (err)
goto out_free_map;
+ ns->serial_num = ns_serial();
+
kref_init(&ns->kref);
ns->level = level;
ns->parent = get_pid_ns(parent_pid_ns);
diff --git a/kernel/user.c b/kernel/user.c
index c006131..fb16754 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -51,6 +51,7 @@ struct user_namespace init_user_ns = {
.owner = GLOBAL_ROOT_UID,
.group = GLOBAL_ROOT_GID,
.proc_inum = PROC_USER_INIT_INO,
+ .serial_num = NS_USER_INIT_SN /* ns_serial() */,
#ifdef CONFIG_PERSISTENT_KEYRINGS
.persistent_keyring_register_sem =
__RWSEM_INITIALIZER(init_user_ns.persistent_keyring_register_sem),
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index dd06439..750241c 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -92,6 +92,8 @@ int create_user_ns(struct cred *new)
return ret;
}
+ ns->serial_num = ns_serial();
+
atomic_set(&ns->count, 1);
/* Leave the new->user_ns reference with the new user namespace. */
ns->parent = parent_ns;
diff --git a/kernel/utsname.c b/kernel/utsname.c
index fd39312..74fa737 100644
--- a/kernel/utsname.c
+++ b/kernel/utsname.c
@@ -47,6 +47,8 @@ static struct uts_namespace *clone_uts_ns(struct user_namespace *user_ns,
kfree(ns);
return ERR_PTR(err);
}
+
+ ns->serial_num = ns_serial();
down_read(&uts_sem);
memcpy(&ns->name, &old_ns->name, sizeof(ns->name));
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 81d3a9a..e0b8528 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -104,8 +104,10 @@ static int ops_init(const struct pernet_operations *ops, struct net *net)
err = 0;
if (ops->init)
err = ops->init(net);
- if (!err)
+ if (!err) {
+ net->serial_num = ns_serial();
return 0;
+ }
cleanup:
kfree(data);
--
1.7.1
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