[PATCH V2 1/6] namespaces: assign each namespace instance a serial number
Richard Guy Briggs
rgb at redhat.com
Sat May 10 00:27:22 UTC 2014
Generate and assign a serial number per namespace instance since boot.
Use a serial number per namespace (unique across one boot of one kernel)
instead of the inode number (which is claimed to have had the right to change
reserved and is not necessarily unique if there is more than one proc fs) to
uniquely identify it per kernel boot.
Signed-off-by: Richard Guy Briggs <rgb at redhat.com>
---
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 | 20 ++++++++++++++++++++
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, 50 insertions(+), 1 deletions(-)
diff --git a/fs/mount.h b/fs/mount.h
index b29e42f..3d2f451 100644
--- a/fs/mount.h
+++ b/fs/mount.h
@@ -5,6 +5,7 @@
struct mnt_namespace {
atomic_t count;
unsigned int proc_inum;
+ unsigned long long 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..392e45c 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 long long serial_num;
};
extern struct ipc_namespace init_ipc_ns;
diff --git a/include/linux/nsproxy.h b/include/linux/nsproxy.h
index b4ec59d..3329335 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 long long 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..ad20a38 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 long long 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..5f18aa0 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 long long 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..ad5f9ea 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 long long 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..a8d4bd9 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 long long 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..f4f1068 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -41,6 +41,26 @@ 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 long long ns_serial(void)
+{
+ static DEFINE_SPINLOCK(serial_lock);
+ static unsigned long long serial = 4; /* reserved for IPC, UTS, user, PID */
+ unsigned long flags;
+
+ spin_lock_irqsave(&serial_lock, flags);
+ ++serial;
+ spin_unlock_irqrestore(&serial_lock, flags);
+ BUG_ON(!serial);
+
+ return serial;
+}
+
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..d0cf7b5 100644
--- a/kernel/utsname.c
+++ b/kernel/utsname.c
@@ -48,6 +48,8 @@ static struct uts_namespace *clone_uts_ns(struct user_namespace *user_ns,
return ERR_PTR(err);
}
+ ns->serial_num = ns_serial();
+
down_read(&uts_sem);
memcpy(&ns->name, &old_ns->name, sizeof(ns->name));
ns->user_ns = get_user_ns(user_ns);
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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