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| author | Serge E. Hallyn <serge@hallyn.com> | 2011-03-23 16:43:23 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-23 19:47:07 -0700 |
| commit | b515498f5bb5f38fc0e390b4ff7d00b6077de127 (patch) | |
| tree | b76dfc56415adee9aec5d8619124059ed3ab02a5 | |
| parent | fc832ad3645f0507f24d11752544525a50a83c71 (diff) | |
| download | linux-b515498f5bb5f38fc0e390b4ff7d00b6077de127.tar.gz linux-b515498f5bb5f38fc0e390b4ff7d00b6077de127.tar.bz2 linux-b515498f5bb5f38fc0e390b4ff7d00b6077de127.zip | |
userns: add a user namespace owner of ipc ns
Changelog:
Feb 15: Don't set new ipc->user_ns if we didn't create a new
ipc_ns.
Feb 23: Move extern declaration to ipc_namespace.h, and group
fwd declarations at top.
Signed-off-by: Serge E. Hallyn <serge.hallyn@canonical.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Daniel Lezcano <daniel.lezcano@free.fr>
Acked-by: David Howells <dhowells@redhat.com>
Cc: James Morris <jmorris@namei.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/linux/ipc_namespace.h | 3 | ||||
| -rw-r--r-- | ipc/msgutil.c | 1 | ||||
| -rw-r--r-- | ipc/namespace.c | 9 | ||||
| -rw-r--r-- | kernel/nsproxy.c | 5 |
4 files changed, 16 insertions, 2 deletions
diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h index 51952989ad42..d3c32dcec623 100644 --- a/include/linux/ipc_namespace.h +++ b/include/linux/ipc_namespace.h @@ -15,6 +15,7 @@ #define IPCNS_CALLBACK_PRI 0 +struct user_namespace; struct ipc_ids { int in_use; @@ -56,6 +57,8 @@ struct ipc_namespace { unsigned int mq_msg_max; /* initialized to DFLT_MSGMAX */ unsigned int mq_msgsize_max; /* initialized to DFLT_MSGSIZEMAX */ + /* user_ns which owns the ipc ns */ + struct user_namespace *user_ns; }; extern struct ipc_namespace init_ipc_ns; diff --git a/ipc/msgutil.c b/ipc/msgutil.c index f095ee268833..8b5ce5d3f3ef 100644 --- a/ipc/msgutil.c +++ b/ipc/msgutil.c @@ -32,6 +32,7 @@ struct ipc_namespace init_ipc_ns = { .mq_msg_max = DFLT_MSGMAX, .mq_msgsize_max = DFLT_MSGSIZEMAX, #endif + .user_ns = &init_user_ns, }; atomic_t nr_ipc_ns = ATOMIC_INIT(1); diff --git a/ipc/namespace.c b/ipc/namespace.c index a1094ff0befa..aa1889962693 100644 --- a/ipc/namespace.c +++ b/ipc/namespace.c @@ -11,10 +11,11 @@ #include <linux/slab.h> #include <linux/fs.h> #include <linux/mount.h> +#include <linux/user_namespace.h> #include "util.h" -static struct ipc_namespace *create_ipc_ns(void) +static struct ipc_namespace *create_ipc_ns(struct ipc_namespace *old_ns) { struct ipc_namespace *ns; int err; @@ -43,6 +44,9 @@ static struct ipc_namespace *create_ipc_ns(void) ipcns_notify(IPCNS_CREATED); register_ipcns_notifier(ns); + ns->user_ns = old_ns->user_ns; + get_user_ns(ns->user_ns); + return ns; } @@ -50,7 +54,7 @@ struct ipc_namespace *copy_ipcs(unsigned long flags, struct ipc_namespace *ns) { if (!(flags & CLONE_NEWIPC)) return get_ipc_ns(ns); - return create_ipc_ns(); + return create_ipc_ns(ns); } /* @@ -105,6 +109,7 @@ static void free_ipc_ns(struct ipc_namespace *ns) * order to have a correct value when recomputing msgmni. */ ipcns_notify(IPCNS_REMOVED); + put_user_ns(ns->user_ns); } /* diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c index b97fc9d04ddf..ac8a56e90bf8 100644 --- a/kernel/nsproxy.c +++ b/kernel/nsproxy.c @@ -80,6 +80,11 @@ static struct nsproxy *create_new_namespaces(unsigned long flags, err = PTR_ERR(new_nsp->ipc_ns); goto out_ipc; } + if (new_nsp->ipc_ns != tsk->nsproxy->ipc_ns) { + put_user_ns(new_nsp->ipc_ns->user_ns); + new_nsp->ipc_ns->user_ns = task_cred_xxx(tsk, user)->user_ns; + get_user_ns(new_nsp->ipc_ns->user_ns); + } new_nsp->pid_ns = copy_pid_ns(flags, task_active_pid_ns(tsk)); if (IS_ERR(new_nsp->pid_ns)) { |