Quoting Eric W. Biederman (ebiederm@xxxxxxxxxxxx):
> Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Acked-by: Serge Hallyn <serge@xxxxxxxxxx>
> ---
> include/linux/user_namespace.h | 1 +
> ipc/namespace.c | 42 +++++++++++++++++++++++++++++++-----------
> kernel/user_namespace.c | 1 +
> 3 files changed, 33 insertions(+), 11 deletions(-)
>
> diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h
> index bed2506081fe..367cf08ff63d 100644
> --- a/include/linux/user_namespace.h
> +++ b/include/linux/user_namespace.h
> @@ -26,6 +26,7 @@ enum ucounts {
> UCOUNT_USER_NAMESPACES,
> UCOUNT_PID_NAMESPACES,
> UCOUNT_UTS_NAMESPACES,
> + UCOUNT_IPC_NAMESPACES,
> UCOUNT_COUNTS,
> };
>
> diff --git a/ipc/namespace.c b/ipc/namespace.c
> index 04cb07eb81f1..3996a1e41a1d 100644
> --- a/ipc/namespace.c
> +++ b/ipc/namespace.c
> @@ -16,33 +16,42 @@
>
> #include "util.h"
>
> +static bool inc_ipc_namespaces(struct user_namespace *ns)
> +{
> + return inc_ucount(ns, UCOUNT_IPC_NAMESPACES);
> +}
> +
> +static void dec_ipc_namespaces(struct user_namespace *ns)
> +{
> + dec_ucount(ns, UCOUNT_IPC_NAMESPACES);
> +}
> +
> static struct ipc_namespace *create_ipc_ns(struct user_namespace *user_ns,
> struct ipc_namespace *old_ns)
> {
> struct ipc_namespace *ns;
> int err;
>
> + err = -ENFILE;
> + if (!inc_ipc_namespaces(user_ns))
> + goto fail;
> +
> + err = -ENOMEM;
> ns = kmalloc(sizeof(struct ipc_namespace), GFP_KERNEL);
> if (ns == NULL)
> - return ERR_PTR(-ENOMEM);
> + goto fail_dec;
>
> err = ns_alloc_inum(&ns->ns);
> - if (err) {
> - kfree(ns);
> - return ERR_PTR(err);
> - }
> + if (err)
> + goto fail_free;
> ns->ns.ops = &ipcns_operations;
>
> atomic_set(&ns->count, 1);
> ns->user_ns = get_user_ns(user_ns);
>
> err = mq_init_ns(ns);
> - if (err) {
> - put_user_ns(ns->user_ns);
> - ns_free_inum(&ns->ns);
> - kfree(ns);
> - return ERR_PTR(err);
> - }
> + if (err)
> + goto fail_put;
> atomic_inc(&nr_ipc_ns);
>
> sem_init_ns(ns);
> @@ -50,6 +59,16 @@ static struct ipc_namespace *create_ipc_ns(struct user_namespace *user_ns,
> shm_init_ns(ns);
>
> return ns;
> +
> +fail_put:
> + put_user_ns(ns->user_ns);
> + ns_free_inum(&ns->ns);
> +fail_free:
> + kfree(ns);
> +fail_dec:
> + dec_ipc_namespaces(user_ns);
> +fail:
> + return ERR_PTR(err);
> }
>
> struct ipc_namespace *copy_ipcs(unsigned long flags,
> @@ -98,6 +117,7 @@ static void free_ipc_ns(struct ipc_namespace *ns)
> shm_exit_ns(ns);
> atomic_dec(&nr_ipc_ns);
>
> + dec_ipc_namespaces(ns->user_ns);
> put_user_ns(ns->user_ns);
> ns_free_inum(&ns->ns);
> kfree(ns);
> diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
> index 6b205c24e888..060d3e099f87 100644
> --- a/kernel/user_namespace.c
> +++ b/kernel/user_namespace.c
> @@ -79,6 +79,7 @@ static struct ctl_table userns_table[] = {
> UCOUNT_ENTRY("max_user_namespaces"),
> UCOUNT_ENTRY("max_pid_namespaces"),
> UCOUNT_ENTRY("max_uts_namespaces"),
> + UCOUNT_ENTRY("max_ipc_namespaces"),
> { }
> };
> #endif /* CONFIG_SYSCTL */
> --
> 2.8.3
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