Eric W. Biederman
0663c6f8fa
ns: Introduce the setns syscall ...
With the networking stack today there is demand to handle
multiple network stacks at a time. Not in the context
of containers but in the context of people doing interesting
things with routing.
There is also demand in the context of containers to have
an efficient way to execute some code in the container itself.
If nothing else it is very useful ad a debugging technique.
Both problems can be solved by starting some form of login
daemon in the namespaces people want access to, or you
can play games by ptracing a process and getting the
traced process to do things you want it to do. However
it turns out that a login daemon or a ptrace puppet
controller are more code, they are more prone to
failure, and generally they are less efficient than
simply changing the namespace of a process to a
specified one.
Pieces of this puzzle can also be solved by instead of
coming up with a general purpose system call coming up
with targed system calls perhaps socketat that solve
a subset of the larger problem. Overall that appears
to be more work for less reward.
int setns(int fd, int nstype);
The fd argument is a file descriptor referring to a proc
file of the namespace you want to switch the process to.
In the setns system call the nstype is 0 or specifies
an clone flag of the namespace you intend to change
to prevent changing a namespace unintentionally.
v2: Most of the architecture support added by Daniel Lezcano <dlezcano@fr.ibm.com>
v3: ported to v2.6.36-rc4 by: Eric W. Biederman <ebiederm@xmission.com>
v4: Moved wiring up of the system call to another patch
v5: Cleaned up the system call arguments
- Changed the order.
- Modified nstype to take the standard clone flags.
v6: Added missing error handling as pointed out by Matt Helsley <matthltc@us.ibm.com>
Acked-by: Daniel Lezcano <daniel.lezcano@free.fr>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
2011-05-10 14:32:56 -07:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
Merge branch 'trivial' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6
2011-03-20 18:14:55 -07:00
genirq: Fix typo CONFIG_GENIRC_IRQ_SHOW_LEVEL
2011-05-02 21:16:37 +02:00
PM: Fix error code paths executed after failing syscore_suspend()
2011-04-18 23:58:59 +02:00
posix clocks: Replace mutex with reader/writer semaphore
2011-04-18 10:39:38 +02:00
Merge branch 'tip/perf/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into perf/urgent
2011-04-27 10:31:29 +02:00
netlink: kill loginuid/sessionid/sid members from struct netlink_skb_parms
2011-03-03 10:55:40 -08:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
kill path_lookup()
2011-03-14 09:15:23 -04:00
netlink: kill loginuid/sessionid/sid members from struct netlink_skb_parms
2011-03-03 10:55:40 -08:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
memcg: remove direct page_cgroup-to-page pointer
2011-03-23 19:46:28 -07:00
userns: make has_capability* into real functions
2011-03-23 19:47:06 -07:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
posix-timers: Introduce a syscall for clock tuning.
2011-02-02 15:28:19 +01:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
cpuset: hold callback_mutex in cpuset_post_clone()
2011-03-23 19:46:35 -07:00
crash_dump: export is_kdump_kernel to modules, consolidate elfcorehdr_addr, setup_elfcorehdr and saved_max_pfn
2011-03-23 19:47:19 -07:00
userns: security: make capabilities relative to the user namespace
2011-03-23 19:47:02 -07:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
Freezer: Fix a race during freezing of TASK_STOPPED tasks
2010-12-24 15:02:40 +01:00
futex: Set FLAGS_HAS_TIMEOUT during futex_wait restart setup
2011-04-15 16:34:32 +02:00
userns: user namespaces: convert several capable() calls
2011-03-23 19:47:08 -07:00
userns: user namespaces: convert several capable() calls
2011-03-23 19:47:08 -07:00
hrtimer: Initialize CLOCK_ID to HRTIMER_BASE table statically
2011-04-29 10:57:11 +02:00
perf: Dynamic pmu types
2010-12-16 11:36:43 +01:00
irq_work: Use per cpu atomics instead of regular atomics
2010-12-18 15:54:48 +01:00
Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2011-03-25 17:52:22 -07:00
PM: Add missing syscore_suspend() and syscore_resume() calls
2011-04-20 00:36:11 +02:00
Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
2011-01-07 17:02:58 -08:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
lockdep: Remove unused 'factor' variable from lockdep_stats_show()
2011-03-23 13:54:47 +01:00
crash_dump: export is_kdump_kernel to modules, consolidate elfcorehdr_addr, setup_elfcorehdr and saved_max_pfn
2011-03-23 19:47:19 -07:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
ns: Introduce the setns syscall
2011-05-10 14:32:56 -07:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
move x86 specific oops=panic to generic code
2011-03-22 17:44:11 -07:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
perf_event: Fix cgrp event scheduling bug in perf_enable_on_exec()
2011-04-11 11:07:55 +02:00
next_pidmap: fix overflow condition
2011-04-18 10:35:30 -07:00
pidns: call pid_ns_prepare_proc() from create_pid_namespace()
2011-03-23 19:46:58 -07:00
PM QoS: Make pm_qos settings readable
2011-03-15 00:43:18 +01:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
printk: allow setting DEFAULT_MESSAGE_LEVEL via Kconfig
2011-03-22 17:44:13 -07:00
userns: allow ptrace from non-init user namespaces
2011-03-23 19:47:05 -07:00
rcu: add comment saying why DEBUG_OBJECTS_RCU_HEAD depends on PREEMPT.
2011-03-04 08:05:41 -08:00
rcu: avoid pointless blocked-task warnings
2011-01-14 04:58:08 -08:00
rcu: call __rcu_read_unlock() in exit_rcu for tiny RCU
2011-03-04 08:05:08 -08:00
rcutorture: Get rid of duplicate sched.h include
2011-03-04 08:05:17 -08:00
Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
2011-01-07 17:02:58 -08:00
rcu: limit rcu_node leaf-level fanout
2010-12-17 12:34:20 -08:00
rcu: increase synchronize_sched_expedited() batching
2010-12-17 12:34:08 -08:00
rcu,cleanup: simplify the code when cpu is dying
2010-11-29 22:01:58 -08:00
memcg: res_counter_read_u64(): fix potential races on 32-bit machines
2011-03-23 19:46:22 -07:00
resources: add arch hook for preventing allocation in reserved areas
2010-12-17 10:01:09 -08:00
rtmutex: Simplify PI algorithm and make highest prio task get lock
2011-01-27 21:13:51 -05:00
rtmutex: tester: Remove the remaining BKL leftovers
2011-02-22 22:07:22 +01:00
rtmutex: Simplify PI algorithm and make highest prio task get lock
2011-01-27 21:13:51 -05:00
rtmutex: Simplify PI algorithm and make highest prio task get lock
2011-01-27 21:13:51 -05:00
block: let io_schedule() flush the plug inline
2011-04-16 13:27:55 +02:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
sched, autogroup: Stop going ahead if autogroup is disabled
2011-02-23 11:33:59 +01:00
sched: Add some clock info to sched_debug
2010-11-23 10:29:08 +01:00
sched: Use a buddy to implement yield_task_fair()
2011-02-03 14:20:33 +01:00
sched: Fix erroneous all_pinned logic
2011-04-11 11:08:54 +02:00
sched, doc: Update sched-design-CFS.txt
2011-03-23 14:09:41 +01:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
sched, doc: Update sched-design-CFS.txt
2011-03-23 14:09:41 +01:00
signal.c: fix erroneous syscall kernel-doc
2011-04-08 11:05:24 -07:00
smp: move smp setup functions to kernel/smp.c
2011-03-22 17:44:11 -07:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
rcu: demote SRCU_SYNCHRONIZE_DELAY from kernel-parameter status
2011-01-14 04:56:49 -08:00
kthread: use kthread_create_on_node()
2011-03-22 17:44:01 -07:00
userns: user namespaces: convert all capable checks in kernel/sys.c
2011-03-23 19:47:06 -07:00
vfs: Add open by file handle support
2011-03-15 02:21:44 -04:00
sysctl: restrict write access to dmesg_restrict
2011-03-23 19:46:54 -07:00
open-style analog of vfs_path_lookup()
2011-03-14 09:15:28 -04:00
sysctl_check: drop dead code
2011-03-23 19:46:51 -07:00
taskstats: use appropriate printk priority level
2011-03-23 19:47:14 -07:00
Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2011-03-15 18:53:35 -07:00
Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2011-03-15 18:53:35 -07:00
tracepoints: Fix section alignment using pointer array
2011-02-03 09:28:46 -05:00
userns: user namespaces: convert several capable() calls
2011-03-23 19:47:08 -07:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
userns: add a user_namespace as creator/owner of uts_namespace
2011-03-23 19:46:59 -07:00
user_ns: improve the user_ns on-the-slab packaging
2011-01-13 08:03:18 -08:00
userns: allow sethostname in a container
2011-03-23 19:47:03 -07:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
kernel/watchdog.c: disable nmi perf event in the error path of enabling watchdog
2011-04-28 11:28:21 -07:00
workqueue: fix deadlock in worker_maybe_bind_and_lock()
2011-04-29 18:08:37 +02:00
0663c6f8fa