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| author | Eric W. Biederman <ebiederm@xmission.com> | 2010-03-07 18:43:27 -0800 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2011-05-10 14:35:35 -0700 |
| commit | 34482e89a5218f0f9317abf1cfba3bb38b5c29dd (patch) | |
| tree | 94a2c2409fbbef8a01aae589469ee44180e6e04f | |
| parent | 13b6f57623bc485e116344fe91fbcb29f149242b (diff) | |
| download | lwn-34482e89a5218f0f9317abf1cfba3bb38b5c29dd.tar.gz lwn-34482e89a5218f0f9317abf1cfba3bb38b5c29dd.zip | |
ns proc: Add support for the uts namespace
Acked-by: Daniel Lezcano <daniel.lezcano@free.fr>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
| -rw-r--r-- | fs/proc/namespaces.c | 3 | ||||
| -rw-r--r-- | include/linux/proc_fs.h | 1 | ||||
| -rw-r--r-- | kernel/utsname.c | 39 |
3 files changed, 43 insertions, 0 deletions
diff --git a/fs/proc/namespaces.c b/fs/proc/namespaces.c index dcbd483e9915..b017181f1273 100644 --- a/fs/proc/namespaces.c +++ b/fs/proc/namespaces.c @@ -19,6 +19,9 @@ static const struct proc_ns_operations *ns_entries[] = { #ifdef CONFIG_NET_NS &netns_operations, #endif +#ifdef CONFIG_UTS_NS + &utsns_operations, +#endif }; static const struct file_operations ns_file_operations = { diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h index 62126ec6ede9..52aa89df8a6d 100644 --- a/include/linux/proc_fs.h +++ b/include/linux/proc_fs.h @@ -266,6 +266,7 @@ struct proc_ns_operations { int (*install)(struct nsproxy *nsproxy, void *ns); }; extern const struct proc_ns_operations netns_operations; +extern const struct proc_ns_operations utsns_operations; union proc_op { int (*proc_get_link)(struct inode *, struct path *); diff --git a/kernel/utsname.c b/kernel/utsname.c index 44646179eaba..bff131b9510a 100644 --- a/kernel/utsname.c +++ b/kernel/utsname.c @@ -15,6 +15,7 @@ #include <linux/err.h> #include <linux/slab.h> #include <linux/user_namespace.h> +#include <linux/proc_fs.h> static struct uts_namespace *create_uts_ns(void) { @@ -79,3 +80,41 @@ void free_uts_ns(struct kref *kref) put_user_ns(ns->user_ns); kfree(ns); } + +static void *utsns_get(struct task_struct *task) +{ + struct uts_namespace *ns = NULL; + struct nsproxy *nsproxy; + + rcu_read_lock(); + nsproxy = task_nsproxy(task); + if (nsproxy) { + ns = nsproxy->uts_ns; + get_uts_ns(ns); + } + rcu_read_unlock(); + + return ns; +} + +static void utsns_put(void *ns) +{ + put_uts_ns(ns); +} + +static int utsns_install(struct nsproxy *nsproxy, void *ns) +{ + get_uts_ns(ns); + put_uts_ns(nsproxy->uts_ns); + nsproxy->uts_ns = ns; + return 0; +} + +const struct proc_ns_operations utsns_operations = { + .name = "uts", + .type = CLONE_NEWUTS, + .get = utsns_get, + .put = utsns_put, + .install = utsns_install, +}; + |