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![Andrei Vagin](/assets/img/avatar_default.png)
Changing a time namespace requires remapping a vvar page, so we don't want
to allow doing that if any other tasks can use the same mm.
Currently, we install a time namespace when a task is created with a new
vm. exec() is another case when a task gets a new mm and so it can switch
a time namespace safely, but it isn't handled now.
One more issue of the current interface is that clone() with CLONE_VM isn't
allowed if the current task has unshared a time namespace
(timens_for_children doesn't match the current timens).
Both these issues make some inconvenience for users. For example, Alexey
and Florian reported that posix_spawn() uses vfork+exec and this pattern
doesn't work with time namespaces due to the both described issues.
LXC needed to workaround the exec() issue by calling setns.
In the commit 133e2d3e81
("fs/exec: allow to unshare a time namespace on
vfork+exec"), we tried to fix these issues with minimal impact on UAPI. But
it adds extra complexity and some undesirable side effects. Eric suggested
fixing the issues properly because here are all the reasons to suppose that
there are no users that depend on the old behavior.
Cc: Alexey Izbyshev <izbyshev@ispras.ru>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Dmitry Safonov <0x7f454c46@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Suggested-by: "Eric W. Biederman" <ebiederm@xmission.com>
Origin-author: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220921003120.209637-1-avagin@google.com
592 lines
13 KiB
C
592 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2006 IBM Corporation
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*
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* Author: Serge Hallyn <serue@us.ibm.com>
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*
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* Jun 2006 - namespaces support
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* OpenVZ, SWsoft Inc.
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* Pavel Emelianov <xemul@openvz.org>
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*/
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <linux/nsproxy.h>
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#include <linux/init_task.h>
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#include <linux/mnt_namespace.h>
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#include <linux/utsname.h>
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#include <linux/pid_namespace.h>
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#include <net/net_namespace.h>
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#include <linux/ipc_namespace.h>
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#include <linux/time_namespace.h>
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#include <linux/fs_struct.h>
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#include <linux/proc_fs.h>
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#include <linux/proc_ns.h>
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#include <linux/file.h>
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#include <linux/syscalls.h>
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#include <linux/cgroup.h>
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#include <linux/perf_event.h>
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static struct kmem_cache *nsproxy_cachep;
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struct nsproxy init_nsproxy = {
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.count = ATOMIC_INIT(1),
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.uts_ns = &init_uts_ns,
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#if defined(CONFIG_POSIX_MQUEUE) || defined(CONFIG_SYSVIPC)
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.ipc_ns = &init_ipc_ns,
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#endif
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.mnt_ns = NULL,
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.pid_ns_for_children = &init_pid_ns,
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#ifdef CONFIG_NET
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.net_ns = &init_net,
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#endif
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#ifdef CONFIG_CGROUPS
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.cgroup_ns = &init_cgroup_ns,
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#endif
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#ifdef CONFIG_TIME_NS
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.time_ns = &init_time_ns,
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.time_ns_for_children = &init_time_ns,
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#endif
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};
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static inline struct nsproxy *create_nsproxy(void)
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{
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struct nsproxy *nsproxy;
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nsproxy = kmem_cache_alloc(nsproxy_cachep, GFP_KERNEL);
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if (nsproxy)
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atomic_set(&nsproxy->count, 1);
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return nsproxy;
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}
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/*
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* Create new nsproxy and all of its the associated namespaces.
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* Return the newly created nsproxy. Do not attach this to the task,
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* leave it to the caller to do proper locking and attach it to task.
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*/
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static struct nsproxy *create_new_namespaces(unsigned long flags,
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struct task_struct *tsk, struct user_namespace *user_ns,
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struct fs_struct *new_fs)
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{
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struct nsproxy *new_nsp;
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int err;
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new_nsp = create_nsproxy();
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if (!new_nsp)
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return ERR_PTR(-ENOMEM);
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new_nsp->mnt_ns = copy_mnt_ns(flags, tsk->nsproxy->mnt_ns, user_ns, new_fs);
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if (IS_ERR(new_nsp->mnt_ns)) {
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err = PTR_ERR(new_nsp->mnt_ns);
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goto out_ns;
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}
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new_nsp->uts_ns = copy_utsname(flags, user_ns, tsk->nsproxy->uts_ns);
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if (IS_ERR(new_nsp->uts_ns)) {
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err = PTR_ERR(new_nsp->uts_ns);
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goto out_uts;
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}
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new_nsp->ipc_ns = copy_ipcs(flags, user_ns, tsk->nsproxy->ipc_ns);
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if (IS_ERR(new_nsp->ipc_ns)) {
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err = PTR_ERR(new_nsp->ipc_ns);
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goto out_ipc;
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}
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new_nsp->pid_ns_for_children =
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copy_pid_ns(flags, user_ns, tsk->nsproxy->pid_ns_for_children);
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if (IS_ERR(new_nsp->pid_ns_for_children)) {
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err = PTR_ERR(new_nsp->pid_ns_for_children);
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goto out_pid;
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}
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new_nsp->cgroup_ns = copy_cgroup_ns(flags, user_ns,
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tsk->nsproxy->cgroup_ns);
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if (IS_ERR(new_nsp->cgroup_ns)) {
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err = PTR_ERR(new_nsp->cgroup_ns);
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goto out_cgroup;
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}
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new_nsp->net_ns = copy_net_ns(flags, user_ns, tsk->nsproxy->net_ns);
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if (IS_ERR(new_nsp->net_ns)) {
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err = PTR_ERR(new_nsp->net_ns);
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goto out_net;
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}
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new_nsp->time_ns_for_children = copy_time_ns(flags, user_ns,
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tsk->nsproxy->time_ns_for_children);
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if (IS_ERR(new_nsp->time_ns_for_children)) {
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err = PTR_ERR(new_nsp->time_ns_for_children);
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goto out_time;
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}
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new_nsp->time_ns = get_time_ns(tsk->nsproxy->time_ns);
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return new_nsp;
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out_time:
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put_net(new_nsp->net_ns);
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out_net:
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put_cgroup_ns(new_nsp->cgroup_ns);
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out_cgroup:
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if (new_nsp->pid_ns_for_children)
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put_pid_ns(new_nsp->pid_ns_for_children);
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out_pid:
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if (new_nsp->ipc_ns)
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put_ipc_ns(new_nsp->ipc_ns);
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out_ipc:
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if (new_nsp->uts_ns)
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put_uts_ns(new_nsp->uts_ns);
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out_uts:
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if (new_nsp->mnt_ns)
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put_mnt_ns(new_nsp->mnt_ns);
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out_ns:
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kmem_cache_free(nsproxy_cachep, new_nsp);
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return ERR_PTR(err);
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}
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/*
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* called from clone. This now handles copy for nsproxy and all
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* namespaces therein.
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*/
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int copy_namespaces(unsigned long flags, struct task_struct *tsk)
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{
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struct nsproxy *old_ns = tsk->nsproxy;
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struct user_namespace *user_ns = task_cred_xxx(tsk, user_ns);
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struct nsproxy *new_ns;
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if (likely(!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
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CLONE_NEWPID | CLONE_NEWNET |
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CLONE_NEWCGROUP | CLONE_NEWTIME)))) {
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if ((flags & CLONE_VM) ||
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likely(old_ns->time_ns_for_children == old_ns->time_ns)) {
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get_nsproxy(old_ns);
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return 0;
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}
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} else if (!ns_capable(user_ns, CAP_SYS_ADMIN))
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return -EPERM;
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/*
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* CLONE_NEWIPC must detach from the undolist: after switching
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* to a new ipc namespace, the semaphore arrays from the old
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* namespace are unreachable. In clone parlance, CLONE_SYSVSEM
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* means share undolist with parent, so we must forbid using
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* it along with CLONE_NEWIPC.
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*/
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if ((flags & (CLONE_NEWIPC | CLONE_SYSVSEM)) ==
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(CLONE_NEWIPC | CLONE_SYSVSEM))
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return -EINVAL;
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new_ns = create_new_namespaces(flags, tsk, user_ns, tsk->fs);
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if (IS_ERR(new_ns))
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return PTR_ERR(new_ns);
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if ((flags & CLONE_VM) == 0)
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timens_on_fork(new_ns, tsk);
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tsk->nsproxy = new_ns;
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return 0;
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}
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void free_nsproxy(struct nsproxy *ns)
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{
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if (ns->mnt_ns)
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put_mnt_ns(ns->mnt_ns);
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if (ns->uts_ns)
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put_uts_ns(ns->uts_ns);
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if (ns->ipc_ns)
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put_ipc_ns(ns->ipc_ns);
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if (ns->pid_ns_for_children)
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put_pid_ns(ns->pid_ns_for_children);
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if (ns->time_ns)
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put_time_ns(ns->time_ns);
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if (ns->time_ns_for_children)
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put_time_ns(ns->time_ns_for_children);
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put_cgroup_ns(ns->cgroup_ns);
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put_net(ns->net_ns);
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kmem_cache_free(nsproxy_cachep, ns);
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}
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/*
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* Called from unshare. Unshare all the namespaces part of nsproxy.
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* On success, returns the new nsproxy.
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*/
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int unshare_nsproxy_namespaces(unsigned long unshare_flags,
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struct nsproxy **new_nsp, struct cred *new_cred, struct fs_struct *new_fs)
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{
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struct user_namespace *user_ns;
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int err = 0;
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if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
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CLONE_NEWNET | CLONE_NEWPID | CLONE_NEWCGROUP |
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CLONE_NEWTIME)))
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return 0;
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user_ns = new_cred ? new_cred->user_ns : current_user_ns();
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if (!ns_capable(user_ns, CAP_SYS_ADMIN))
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return -EPERM;
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*new_nsp = create_new_namespaces(unshare_flags, current, user_ns,
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new_fs ? new_fs : current->fs);
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if (IS_ERR(*new_nsp)) {
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err = PTR_ERR(*new_nsp);
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goto out;
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}
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out:
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return err;
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}
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void switch_task_namespaces(struct task_struct *p, struct nsproxy *new)
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{
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struct nsproxy *ns;
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might_sleep();
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task_lock(p);
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ns = p->nsproxy;
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p->nsproxy = new;
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task_unlock(p);
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if (ns)
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put_nsproxy(ns);
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}
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void exit_task_namespaces(struct task_struct *p)
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{
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switch_task_namespaces(p, NULL);
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}
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int exec_task_namespaces(void)
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{
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struct task_struct *tsk = current;
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struct nsproxy *new;
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if (tsk->nsproxy->time_ns_for_children == tsk->nsproxy->time_ns)
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return 0;
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new = create_new_namespaces(0, tsk, current_user_ns(), tsk->fs);
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if (IS_ERR(new))
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return PTR_ERR(new);
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timens_on_fork(new, tsk);
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switch_task_namespaces(tsk, new);
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return 0;
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}
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static int check_setns_flags(unsigned long flags)
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{
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if (!flags || (flags & ~(CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
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CLONE_NEWNET | CLONE_NEWTIME | CLONE_NEWUSER |
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CLONE_NEWPID | CLONE_NEWCGROUP)))
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return -EINVAL;
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#ifndef CONFIG_USER_NS
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if (flags & CLONE_NEWUSER)
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return -EINVAL;
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#endif
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#ifndef CONFIG_PID_NS
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if (flags & CLONE_NEWPID)
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return -EINVAL;
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#endif
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#ifndef CONFIG_UTS_NS
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if (flags & CLONE_NEWUTS)
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return -EINVAL;
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#endif
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#ifndef CONFIG_IPC_NS
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if (flags & CLONE_NEWIPC)
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return -EINVAL;
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#endif
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#ifndef CONFIG_CGROUPS
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if (flags & CLONE_NEWCGROUP)
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return -EINVAL;
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#endif
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#ifndef CONFIG_NET_NS
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if (flags & CLONE_NEWNET)
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return -EINVAL;
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#endif
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#ifndef CONFIG_TIME_NS
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if (flags & CLONE_NEWTIME)
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return -EINVAL;
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#endif
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return 0;
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}
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static void put_nsset(struct nsset *nsset)
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{
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unsigned flags = nsset->flags;
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if (flags & CLONE_NEWUSER)
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put_cred(nsset_cred(nsset));
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/*
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* We only created a temporary copy if we attached to more than just
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* the mount namespace.
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*/
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if (nsset->fs && (flags & CLONE_NEWNS) && (flags & ~CLONE_NEWNS))
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free_fs_struct(nsset->fs);
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if (nsset->nsproxy)
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free_nsproxy(nsset->nsproxy);
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}
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static int prepare_nsset(unsigned flags, struct nsset *nsset)
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{
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struct task_struct *me = current;
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nsset->nsproxy = create_new_namespaces(0, me, current_user_ns(), me->fs);
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if (IS_ERR(nsset->nsproxy))
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return PTR_ERR(nsset->nsproxy);
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if (flags & CLONE_NEWUSER)
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nsset->cred = prepare_creds();
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else
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nsset->cred = current_cred();
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if (!nsset->cred)
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goto out;
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/* Only create a temporary copy of fs_struct if we really need to. */
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if (flags == CLONE_NEWNS) {
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nsset->fs = me->fs;
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} else if (flags & CLONE_NEWNS) {
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nsset->fs = copy_fs_struct(me->fs);
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if (!nsset->fs)
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goto out;
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}
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nsset->flags = flags;
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return 0;
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out:
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put_nsset(nsset);
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return -ENOMEM;
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}
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static inline int validate_ns(struct nsset *nsset, struct ns_common *ns)
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{
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return ns->ops->install(nsset, ns);
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}
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/*
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* This is the inverse operation to unshare().
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* Ordering is equivalent to the standard ordering used everywhere else
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* during unshare and process creation. The switch to the new set of
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* namespaces occurs at the point of no return after installation of
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* all requested namespaces was successful in commit_nsset().
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*/
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static int validate_nsset(struct nsset *nsset, struct pid *pid)
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{
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int ret = 0;
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unsigned flags = nsset->flags;
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struct user_namespace *user_ns = NULL;
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struct pid_namespace *pid_ns = NULL;
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struct nsproxy *nsp;
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struct task_struct *tsk;
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/* Take a "snapshot" of the target task's namespaces. */
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rcu_read_lock();
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tsk = pid_task(pid, PIDTYPE_PID);
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if (!tsk) {
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rcu_read_unlock();
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return -ESRCH;
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}
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if (!ptrace_may_access(tsk, PTRACE_MODE_READ_REALCREDS)) {
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rcu_read_unlock();
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return -EPERM;
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}
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task_lock(tsk);
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nsp = tsk->nsproxy;
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if (nsp)
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get_nsproxy(nsp);
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task_unlock(tsk);
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if (!nsp) {
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rcu_read_unlock();
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return -ESRCH;
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}
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#ifdef CONFIG_PID_NS
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if (flags & CLONE_NEWPID) {
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pid_ns = task_active_pid_ns(tsk);
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if (unlikely(!pid_ns)) {
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rcu_read_unlock();
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ret = -ESRCH;
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goto out;
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}
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get_pid_ns(pid_ns);
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}
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#endif
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#ifdef CONFIG_USER_NS
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if (flags & CLONE_NEWUSER)
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user_ns = get_user_ns(__task_cred(tsk)->user_ns);
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#endif
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rcu_read_unlock();
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/*
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* Install requested namespaces. The caller will have
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* verified earlier that the requested namespaces are
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* supported on this kernel. We don't report errors here
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* if a namespace is requested that isn't supported.
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*/
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#ifdef CONFIG_USER_NS
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if (flags & CLONE_NEWUSER) {
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ret = validate_ns(nsset, &user_ns->ns);
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if (ret)
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goto out;
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}
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#endif
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if (flags & CLONE_NEWNS) {
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ret = validate_ns(nsset, from_mnt_ns(nsp->mnt_ns));
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if (ret)
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goto out;
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}
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#ifdef CONFIG_UTS_NS
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if (flags & CLONE_NEWUTS) {
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ret = validate_ns(nsset, &nsp->uts_ns->ns);
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if (ret)
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goto out;
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}
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#endif
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#ifdef CONFIG_IPC_NS
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if (flags & CLONE_NEWIPC) {
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ret = validate_ns(nsset, &nsp->ipc_ns->ns);
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if (ret)
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goto out;
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}
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#endif
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#ifdef CONFIG_PID_NS
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if (flags & CLONE_NEWPID) {
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ret = validate_ns(nsset, &pid_ns->ns);
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if (ret)
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goto out;
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}
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#endif
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#ifdef CONFIG_CGROUPS
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if (flags & CLONE_NEWCGROUP) {
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ret = validate_ns(nsset, &nsp->cgroup_ns->ns);
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if (ret)
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|
goto out;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_NET_NS
|
|
if (flags & CLONE_NEWNET) {
|
|
ret = validate_ns(nsset, &nsp->net_ns->ns);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_TIME_NS
|
|
if (flags & CLONE_NEWTIME) {
|
|
ret = validate_ns(nsset, &nsp->time_ns->ns);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
#endif
|
|
|
|
out:
|
|
if (pid_ns)
|
|
put_pid_ns(pid_ns);
|
|
if (nsp)
|
|
put_nsproxy(nsp);
|
|
put_user_ns(user_ns);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This is the point of no return. There are just a few namespaces
|
|
* that do some actual work here and it's sufficiently minimal that
|
|
* a separate ns_common operation seems unnecessary for now.
|
|
* Unshare is doing the same thing. If we'll end up needing to do
|
|
* more in a given namespace or a helper here is ultimately not
|
|
* exported anymore a simple commit handler for each namespace
|
|
* should be added to ns_common.
|
|
*/
|
|
static void commit_nsset(struct nsset *nsset)
|
|
{
|
|
unsigned flags = nsset->flags;
|
|
struct task_struct *me = current;
|
|
|
|
#ifdef CONFIG_USER_NS
|
|
if (flags & CLONE_NEWUSER) {
|
|
/* transfer ownership */
|
|
commit_creds(nsset_cred(nsset));
|
|
nsset->cred = NULL;
|
|
}
|
|
#endif
|
|
|
|
/* We only need to commit if we have used a temporary fs_struct. */
|
|
if ((flags & CLONE_NEWNS) && (flags & ~CLONE_NEWNS)) {
|
|
set_fs_root(me->fs, &nsset->fs->root);
|
|
set_fs_pwd(me->fs, &nsset->fs->pwd);
|
|
}
|
|
|
|
#ifdef CONFIG_IPC_NS
|
|
if (flags & CLONE_NEWIPC)
|
|
exit_sem(me);
|
|
#endif
|
|
|
|
#ifdef CONFIG_TIME_NS
|
|
if (flags & CLONE_NEWTIME)
|
|
timens_commit(me, nsset->nsproxy->time_ns);
|
|
#endif
|
|
|
|
/* transfer ownership */
|
|
switch_task_namespaces(me, nsset->nsproxy);
|
|
nsset->nsproxy = NULL;
|
|
}
|
|
|
|
SYSCALL_DEFINE2(setns, int, fd, int, flags)
|
|
{
|
|
struct file *file;
|
|
struct ns_common *ns = NULL;
|
|
struct nsset nsset = {};
|
|
int err = 0;
|
|
|
|
file = fget(fd);
|
|
if (!file)
|
|
return -EBADF;
|
|
|
|
if (proc_ns_file(file)) {
|
|
ns = get_proc_ns(file_inode(file));
|
|
if (flags && (ns->ops->type != flags))
|
|
err = -EINVAL;
|
|
flags = ns->ops->type;
|
|
} else if (!IS_ERR(pidfd_pid(file))) {
|
|
err = check_setns_flags(flags);
|
|
} else {
|
|
err = -EINVAL;
|
|
}
|
|
if (err)
|
|
goto out;
|
|
|
|
err = prepare_nsset(flags, &nsset);
|
|
if (err)
|
|
goto out;
|
|
|
|
if (proc_ns_file(file))
|
|
err = validate_ns(&nsset, ns);
|
|
else
|
|
err = validate_nsset(&nsset, file->private_data);
|
|
if (!err) {
|
|
commit_nsset(&nsset);
|
|
perf_event_namespaces(current);
|
|
}
|
|
put_nsset(&nsset);
|
|
out:
|
|
fput(file);
|
|
return err;
|
|
}
|
|
|
|
int __init nsproxy_cache_init(void)
|
|
{
|
|
nsproxy_cachep = KMEM_CACHE(nsproxy, SLAB_PANIC|SLAB_ACCOUNT);
|
|
return 0;
|
|
}
|