Re: [PATCH V4 1/8] namespaces: assign each namespace instance a serial number

On Aug 20, 2014 8:12 PM, "Richard Guy Briggs" <rgb(a)redhat.com&gt; wrote: > > 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(a)redhat.com&gt; > --- > 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 | 17 +++++++++++++++++ > 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 | 8 +++++++- > 18 files changed, 51 insertions(+), 1 deletions(-) > > diff --git a/fs/mount.h b/fs/mount.h > index d55297f..c076f99 100644 > --- a/fs/mount.h > +++ b/fs/mount.h > @@ -5,6 +5,7 @@ > struct mnt_namespace { > atomic_t count; > unsigned int proc_inum; > + 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 182bc41..9af49ff 100644 > --- a/fs/namespace.c > +++ b/fs/namespace.c > @@ -2486,6 +2486,7 @@ 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..8ccfb2d 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; > + 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..8e5fe0d 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); > } > > +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, Please add an extra value here for the first dynamic value... > +/** > + * ns_serial - compute a serial number for the namespace > + * > + * Compute a serial number for the namespace to uniquely identify it in > + * audit records. > + */ > +long long ns_serial(void) > +{ > + static atomic64_t serial = ATOMIC_INIT(4); /* reserved for IPC, UTS, user, PID */ ...and use it here.

Also, does this work on all architectures?

--Andy