From: Andrey Vagin <avagin-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org> To: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: criu-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org, linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Andrey Vagin <avagin-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org> Subject: [PATCH 4/5] nsfs: add ioctl to get a parent namespace Date: Thu, 14 Jul 2016 11:20:18 -0700 [thread overview] Message-ID: <1468520419-28220-5-git-send-email-avagin@openvz.org> (raw) In-Reply-To: <1468520419-28220-1-git-send-email-avagin-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org> Pid and user namepaces are hierarchical. There is no way to discover parent-child relationships. In a future we will use this interface to dump and restore nested namespaces. Signed-off-by: Andrey Vagin <avagin-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org> --- fs/nsfs.c | 4 ++++ include/linux/proc_ns.h | 1 + include/uapi/linux/nsfs.h | 1 + kernel/pid_namespace.c | 26 ++++++++++++++++++++++++++ kernel/user_namespace.c | 1 + 5 files changed, 33 insertions(+) diff --git a/fs/nsfs.c b/fs/nsfs.c index 1e5d2d0..b607a42 100644 --- a/fs/nsfs.c +++ b/fs/nsfs.c @@ -169,6 +169,10 @@ static long ns_ioctl(struct file *filp, unsigned int ioctl, switch (ioctl) { case NS_GET_USERNS: return open_related_ns(ns, ns_get_owner); + case NS_GET_PARENT: + if (!ns->ops->get_parent) + return -EINVAL; + return open_related_ns(ns, ns->ops->get_parent); default: return -ENOTTY; } diff --git a/include/linux/proc_ns.h b/include/linux/proc_ns.h index de0e771..1c9f720 100644 --- a/include/linux/proc_ns.h +++ b/include/linux/proc_ns.h @@ -18,6 +18,7 @@ struct proc_ns_operations { struct ns_common *(*get)(struct task_struct *task); void (*put)(struct ns_common *ns); int (*install)(struct nsproxy *nsproxy, struct ns_common *ns); + struct ns_common *(*get_parent)(struct ns_common *ns); }; extern const struct proc_ns_operations netns_operations; diff --git a/include/uapi/linux/nsfs.h b/include/uapi/linux/nsfs.h index 7a09ede..88098ea 100644 --- a/include/uapi/linux/nsfs.h +++ b/include/uapi/linux/nsfs.h @@ -5,5 +5,6 @@ #define NSIO 0xb7 #define NS_GET_USERNS _IO(NSIO, 0x1) +#define NS_GET_PARENT _IO(NSIO, 0x2) #endif /* __LINUX_NSFS_H */ diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c index 3529a03..a63adfb 100644 --- a/kernel/pid_namespace.c +++ b/kernel/pid_namespace.c @@ -388,12 +388,38 @@ static int pidns_install(struct nsproxy *nsproxy, struct ns_common *ns) return 0; } +static struct ns_common *pidns_get_parent(struct ns_common *ns) +{ + struct pid_namespace *active = task_active_pid_ns(current); + struct pid_namespace *pid_ns, *p; + + pid_ns = to_pid_ns(ns); + if (pid_ns == &init_pid_ns) { + if (capable(CAP_SYS_ADMIN)) + return ERR_PTR(-ENOENT); + return ERR_PTR(-EPERM); + } + + pid_ns = p = pid_ns->parent; + + for (;;) { + if (p == active) + break; + if (p == &init_pid_ns) + return ERR_PTR(-EPERM); + p = p->parent; + } + + return &get_pid_ns(pid_ns)->ns; +} + const struct proc_ns_operations pidns_operations = { .name = "pid", .type = CLONE_NEWPID, .get = pidns_get, .put = pidns_put, .install = pidns_install, + .get_parent = pidns_get_parent, }; static __init int pid_namespaces_init(void) diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c index 6382e5e..d6ba0b8 100644 --- a/kernel/user_namespace.c +++ b/kernel/user_namespace.c @@ -1024,6 +1024,7 @@ const struct proc_ns_operations userns_operations = { .get = userns_get, .put = userns_put, .install = userns_install, + .get_parent = ns_get_owner, }; static __init int user_namespaces_init(void) -- 2.5.5
WARNING: multiple messages have this Message-ID (diff)
From: Andrey Vagin <avagin@openvz.org> To: linux-kernel@vger.kernel.org Cc: linux-api@vger.kernel.org, containers@lists.linux-foundation.org, criu@openvz.org, linux-fsdevel@vger.kernel.org, Andrey Vagin <avagin@openvz.org> Subject: [PATCH 4/5] nsfs: add ioctl to get a parent namespace Date: Thu, 14 Jul 2016 11:20:18 -0700 [thread overview] Message-ID: <1468520419-28220-5-git-send-email-avagin@openvz.org> (raw) In-Reply-To: <1468520419-28220-1-git-send-email-avagin@openvz.org> Pid and user namepaces are hierarchical. There is no way to discover parent-child relationships. In a future we will use this interface to dump and restore nested namespaces. Signed-off-by: Andrey Vagin <avagin@openvz.org> --- fs/nsfs.c | 4 ++++ include/linux/proc_ns.h | 1 + include/uapi/linux/nsfs.h | 1 + kernel/pid_namespace.c | 26 ++++++++++++++++++++++++++ kernel/user_namespace.c | 1 + 5 files changed, 33 insertions(+) diff --git a/fs/nsfs.c b/fs/nsfs.c index 1e5d2d0..b607a42 100644 --- a/fs/nsfs.c +++ b/fs/nsfs.c @@ -169,6 +169,10 @@ static long ns_ioctl(struct file *filp, unsigned int ioctl, switch (ioctl) { case NS_GET_USERNS: return open_related_ns(ns, ns_get_owner); + case NS_GET_PARENT: + if (!ns->ops->get_parent) + return -EINVAL; + return open_related_ns(ns, ns->ops->get_parent); default: return -ENOTTY; } diff --git a/include/linux/proc_ns.h b/include/linux/proc_ns.h index de0e771..1c9f720 100644 --- a/include/linux/proc_ns.h +++ b/include/linux/proc_ns.h @@ -18,6 +18,7 @@ struct proc_ns_operations { struct ns_common *(*get)(struct task_struct *task); void (*put)(struct ns_common *ns); int (*install)(struct nsproxy *nsproxy, struct ns_common *ns); + struct ns_common *(*get_parent)(struct ns_common *ns); }; extern const struct proc_ns_operations netns_operations; diff --git a/include/uapi/linux/nsfs.h b/include/uapi/linux/nsfs.h index 7a09ede..88098ea 100644 --- a/include/uapi/linux/nsfs.h +++ b/include/uapi/linux/nsfs.h @@ -5,5 +5,6 @@ #define NSIO 0xb7 #define NS_GET_USERNS _IO(NSIO, 0x1) +#define NS_GET_PARENT _IO(NSIO, 0x2) #endif /* __LINUX_NSFS_H */ diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c index 3529a03..a63adfb 100644 --- a/kernel/pid_namespace.c +++ b/kernel/pid_namespace.c @@ -388,12 +388,38 @@ static int pidns_install(struct nsproxy *nsproxy, struct ns_common *ns) return 0; } +static struct ns_common *pidns_get_parent(struct ns_common *ns) +{ + struct pid_namespace *active = task_active_pid_ns(current); + struct pid_namespace *pid_ns, *p; + + pid_ns = to_pid_ns(ns); + if (pid_ns == &init_pid_ns) { + if (capable(CAP_SYS_ADMIN)) + return ERR_PTR(-ENOENT); + return ERR_PTR(-EPERM); + } + + pid_ns = p = pid_ns->parent; + + for (;;) { + if (p == active) + break; + if (p == &init_pid_ns) + return ERR_PTR(-EPERM); + p = p->parent; + } + + return &get_pid_ns(pid_ns)->ns; +} + const struct proc_ns_operations pidns_operations = { .name = "pid", .type = CLONE_NEWPID, .get = pidns_get, .put = pidns_put, .install = pidns_install, + .get_parent = pidns_get_parent, }; static __init int pid_namespaces_init(void) diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c index 6382e5e..d6ba0b8 100644 --- a/kernel/user_namespace.c +++ b/kernel/user_namespace.c @@ -1024,6 +1024,7 @@ const struct proc_ns_operations userns_operations = { .get = userns_get, .put = userns_put, .install = userns_install, + .get_parent = ns_get_owner, }; static __init int user_namespaces_init(void) -- 2.5.5
next prev parent reply other threads:[~2016-07-14 18:20 UTC|newest] Thread overview: 142+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-07-14 18:20 [PATCH 0/5 RFC] Add an interface to discover relationships between namespaces Andrey Vagin 2016-07-14 18:20 ` Andrey Vagin 2016-07-14 18:20 ` [PATCH 1/5] namespaces: move user_ns into ns_common Andrey Vagin [not found] ` <1468520419-28220-2-git-send-email-avagin-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org> 2016-07-15 12:21 ` kbuild test robot 2016-07-15 12:21 ` kbuild test robot 2016-07-14 18:20 ` [PATCH 3/5] nsfs: add ioctl to get an owning user namespace for ns file descriptor Andrey Vagin 2016-07-14 18:48 ` W. Trevor King 2016-07-14 18:48 ` W. Trevor King [not found] ` <1468520419-28220-4-git-send-email-avagin-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org> 2016-07-14 18:48 ` W. Trevor King 2016-07-14 22:02 ` [PATCH 0/5 RFC] Add an interface to discover relationships between namespaces Andrey Vagin 2016-07-14 22:02 ` Andrey Vagin 2016-07-24 5:10 ` Eric W. Biederman 2016-07-24 5:10 ` Eric W. Biederman [not found] ` <87poq3liyq.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org> 2016-07-26 2:07 ` Andrew Vagin 2016-07-26 2:07 ` Andrew Vagin [not found] ` <CANaxB-xw_xBUq=0uT14ANv-jfg2NsGaPy=jyDO9=yF03_7toSw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2016-07-15 2:12 ` [PATCH 1/5] namespaces: move user_ns into ns_common Andrey Vagin 2016-07-15 2:12 ` Andrey Vagin 2016-07-15 2:12 ` [PATCH 4/5] nsfs: add ioctl to get a parent namespace Andrey Vagin 2016-07-15 2:12 ` Andrey Vagin [not found] ` <1468548742-32136-4-git-send-email-avagin-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org> 2016-07-24 5:07 ` Eric W. Biederman 2016-07-24 5:07 ` Eric W. Biederman 2016-07-24 5:07 ` Eric W. Biederman 2016-07-15 2:12 ` [PATCH 5/5] tools/testing: add a test to check nsfs ioctl-s Andrey Vagin [not found] ` <1468548742-32136-1-git-send-email-avagin-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org> 2016-07-15 2:12 ` [PATCH 2/5] kernel: add a helper to get an owning user namespace for a namespace Andrey Vagin 2016-07-15 2:12 ` Andrey Vagin [not found] ` <1468548742-32136-2-git-send-email-avagin-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org> 2016-07-24 5:03 ` Eric W. Biederman 2016-07-24 16:54 ` W. Trevor King 2016-07-24 16:54 ` W. Trevor King 2016-07-24 5:03 ` Eric W. Biederman 2016-07-24 5:03 ` Eric W. Biederman [not found] ` <878twrmxu2.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org> 2016-07-24 6:37 ` Andrew Vagin 2016-07-24 6:37 ` Andrew Vagin [not found] ` <20160724063728.GA17810-1ViLX0X+lBJGNQ1M2rI3KwRV3xvJKrda@public.gmane.org> 2016-07-24 14:30 ` Eric W. Biederman 2016-07-24 14:30 ` Eric W. Biederman 2016-07-24 14:30 ` Eric W. Biederman [not found] ` <87shuzglck.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org> 2016-07-24 17:05 ` W. Trevor King 2016-07-24 17:05 ` W. Trevor King 2016-07-15 2:12 ` [PATCH 3/5] nsfs: add ioctl to get an owning user namespace for ns file descriptor Andrey Vagin 2016-07-15 2:12 ` Andrey Vagin 2016-07-15 2:12 ` [PATCH 4/5] nsfs: add ioctl to get a parent namespace Andrey Vagin 2016-07-15 2:12 ` [PATCH 5/5] tools/testing: add a test to check nsfs ioctl-s Andrey Vagin 2016-07-16 8:21 ` [PATCH 1/5] namespaces: move user_ns into ns_common kbuild test robot 2016-07-16 8:21 ` kbuild test robot 2016-07-23 23:07 ` kbuild test robot 2016-07-23 23:07 ` kbuild test robot 2016-07-24 5:00 ` Eric W. Biederman 2016-07-24 5:00 ` Eric W. Biederman 2016-07-24 5:00 ` Eric W. Biederman 2016-07-24 5:54 ` Andrew Vagin 2016-07-24 5:54 ` Andrew Vagin [not found] ` <87k2gbmy02.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org> 2016-07-24 5:54 ` Andrew Vagin 2016-07-24 5:54 ` Andrew Vagin 2016-07-24 5:54 ` Andrew Vagin 2016-07-24 5:54 ` Andrew Vagin 2016-07-24 5:54 ` Andrew Vagin 2016-07-24 5:54 ` Andrew Vagin 2016-07-24 5:10 ` [PATCH 0/5 RFC] Add an interface to discover relationships between namespaces Eric W. Biederman 2016-07-21 14:41 ` Michael Kerrisk (man-pages) 2016-07-21 14:41 ` Michael Kerrisk (man-pages) [not found] ` <c9bdaf3d-ec93-d754-81ac-9f524a0d0954-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2016-07-21 21:06 ` Andrew Vagin 2016-07-21 21:06 ` Andrew Vagin 2016-07-21 21:06 ` Andrew Vagin [not found] ` <20160721210650.GA10989-1ViLX0X+lBJGNQ1M2rI3KwRV3xvJKrda@public.gmane.org> 2016-07-22 6:48 ` Michael Kerrisk (man-pages) [not found] ` <1515f5f2-5a49-fcab-61f4-8b627d3ba3e2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2016-07-22 18:25 ` Andrey Vagin 2016-07-22 18:25 ` Andrey Vagin 2016-07-25 11:47 ` Michael Kerrisk (man-pages) 2016-07-25 11:47 ` Michael Kerrisk (man-pages) [not found] ` <e2811bf1-4b86-e115-bcdb-301d6f2546eb-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2016-07-25 13:18 ` Eric W. Biederman 2016-07-25 13:18 ` Eric W. Biederman [not found] ` <87lh0pg8jx.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org> 2016-07-25 14:46 ` Michael Kerrisk (man-pages) 2016-07-25 14:46 ` Michael Kerrisk (man-pages) [not found] ` <44ca0e41-dc92-45b1-2a6c-c41a048a072d-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2016-07-25 14:54 ` Serge E. Hallyn 2016-07-25 14:59 ` Eric W. Biederman 2016-07-25 14:59 ` Eric W. Biederman [not found] ` <87r3ahepb4.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org> 2016-07-26 2:54 ` Andrew Vagin 2016-07-26 2:54 ` Andrew Vagin 2016-07-26 8:03 ` Michael Kerrisk (man-pages) 2016-07-26 8:03 ` Michael Kerrisk (man-pages) [not found] ` <3390535b-0660-757f-aeba-c03d936b3485-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2016-07-26 18:25 ` Andrew Vagin 2016-07-26 18:25 ` Andrew Vagin 2016-07-26 18:32 ` W. Trevor King 2016-07-26 18:32 ` W. Trevor King [not found] ` <20160726183224.GN24913-q4NCUed9G3sTnwFZoN752g@public.gmane.org> 2016-07-26 19:11 ` Andrew Vagin 2016-07-26 19:11 ` Andrew Vagin [not found] ` <20160726182524.GA328-1ViLX0X+lBJGNQ1M2rI3KwRV3xvJKrda@public.gmane.org> 2016-07-26 18:32 ` W. Trevor King 2016-07-26 19:17 ` Michael Kerrisk (man-pages) 2016-07-26 19:17 ` Michael Kerrisk (man-pages) [not found] ` <CAKgNAkjmOu+vfiMDyeYQkkf7wQBH9PVmJ4nH2CTg43GrN-k7eA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2016-07-26 20:39 ` Andrew Vagin 2016-07-26 20:39 ` Andrew Vagin 2016-07-28 10:45 ` Michael Kerrisk (man-pages) 2016-07-28 10:45 ` Michael Kerrisk (man-pages) [not found] ` <ca0787a3-b270-e962-46d1-7e63c9335a55-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2016-07-28 12:56 ` Eric W. Biederman 2016-07-28 12:56 ` Eric W. Biederman 2016-07-28 19:00 ` Michael Kerrisk (man-pages) 2016-07-29 18:05 ` Eric W. Biederman 2016-07-29 18:05 ` Eric W. Biederman [not found] ` <87h9b8e2v7.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org> 2016-07-31 21:31 ` Michael Kerrisk (man-pages) 2016-07-31 21:31 ` Michael Kerrisk (man-pages) 2016-08-01 23:01 ` Andrew Vagin 2016-08-01 23:01 ` Andrew Vagin [not found] ` <40e35f1a-10e6-b7a5-936e-a09f008be0d0-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2016-07-29 18:05 ` Eric W. Biederman [not found] ` <87popxkjjp.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org> 2016-07-28 19:00 ` Michael Kerrisk (man-pages) [not found] ` <20160726203955.GA9415-1ViLX0X+lBJGNQ1M2rI3KwRV3xvJKrda@public.gmane.org> 2016-07-28 10:45 ` Michael Kerrisk (man-pages) [not found] ` <20160726025455.GC26206-1ViLX0X+lBJGNQ1M2rI3KwRV3xvJKrda@public.gmane.org> 2016-07-26 8:03 ` Michael Kerrisk (man-pages) 2016-07-26 19:38 ` Eric W. Biederman 2016-07-26 19:38 ` Eric W. Biederman 2016-07-25 14:54 ` Serge E. Hallyn 2016-07-25 14:54 ` Serge E. Hallyn 2016-07-25 15:17 ` Eric W. Biederman 2016-07-25 15:17 ` Eric W. Biederman [not found] ` <20160725145445.GA19879-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org> 2016-07-25 15:17 ` Eric W. Biederman [not found] ` <CANaxB-w8H8Wo8FmtmBBZTpJX-ZDGRQx0rbm9E5c9WbduQ_Ukmw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2016-07-25 11:47 ` Michael Kerrisk (man-pages) [not found] ` <1468520419-28220-1-git-send-email-avagin-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org> 2016-07-14 18:20 ` [PATCH 1/5] namespaces: move user_ns into ns_common Andrey Vagin 2016-07-14 18:20 ` [PATCH 2/5] kernel: add a helper to get an owning user namespace for a namespace Andrey Vagin 2016-07-14 18:20 ` Andrey Vagin [not found] ` <1468520419-28220-3-git-send-email-avagin-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org> 2016-07-14 19:07 ` W. Trevor King 2016-07-14 19:07 ` W. Trevor King 2016-07-14 18:20 ` [PATCH 3/5] nsfs: add ioctl to get an owning user namespace for ns file descriptor Andrey Vagin 2016-07-14 18:20 ` Andrey Vagin [this message] 2016-07-14 18:20 ` [PATCH 4/5] nsfs: add ioctl to get a parent namespace Andrey Vagin 2016-07-14 18:20 ` [PATCH 5/5] tools/testing: add a test to check nsfs ioctl-s Andrey Vagin 2016-07-14 18:20 ` Andrey Vagin 2016-07-14 22:02 ` [PATCH 0/5 RFC] Add an interface to discover relationships between namespaces Andrey Vagin 2016-07-21 14:41 ` Michael Kerrisk (man-pages) 2016-07-23 21:14 ` W. Trevor King 2016-07-23 21:14 ` W. Trevor King [not found] ` <20160723211414.GA25371-q4NCUed9G3sTnwFZoN752g@public.gmane.org> 2016-07-23 21:38 ` James Bottomley 2016-07-23 21:38 ` James Bottomley [not found] ` <1469309936.2332.35.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org> 2016-07-23 21:58 ` W. Trevor King 2016-07-23 21:58 ` W. Trevor King 2016-07-23 21:58 ` W. Trevor King 2016-07-23 21:56 ` Eric W. Biederman 2016-07-23 21:56 ` Eric W. Biederman [not found] ` <87mvl8nhlv.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org> 2016-07-23 22:34 ` W. Trevor King 2016-07-23 22:34 ` W. Trevor King [not found] ` <20160723223448.GP24913-q4NCUed9G3sTnwFZoN752g@public.gmane.org> 2016-07-24 4:51 ` Eric W. Biederman 2016-07-24 4:51 ` Eric W. Biederman [not found] ` <20160723215802.GO24913-q4NCUed9G3sTnwFZoN752g@public.gmane.org> 2016-07-23 21:56 ` Eric W. Biederman 2016-08-01 18:20 ` Alban Crequy 2016-08-01 18:20 ` Alban Crequy [not found] ` <CAMXgnP6j+rTeb5XJgoPV20y8puGyVm=9O9gdg9Sah4DuF5qm9w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2016-08-01 23:32 ` Andrew Vagin 2016-08-01 23:32 ` Andrew Vagin
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