Eric W. Biederman 61bce0f137 pid: generalize task_active_pid_ns ... Currently task_active_pid_ns is not safe to call after a task becomes a zombie and exit_task_namespaces is called, as nsproxy becomes NULL. By reading the pid namespace from the pid of the task we can trivially solve this problem at the cost of one extra memory read in what should be the same cacheline as we read the namespace from. When moving things around I have made task_active_pid_ns out of line because keeping it in pid_namespace.h would require adding includes of pid.h and sched.h that I don't think we want. This change does make task_active_pid_ns unsafe to call during copy_process until we attach a pid on the task_struct which seems to be a reasonable trade off. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Roland McGrath <roland@redhat.com> Cc: Bastian Blank <bastian@waldi.eu.org> Cc: Pavel Emelyanov <xemul@openvz.org> Cc: Nadia Derbey <Nadia.Derbey@bull.net> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2009-01-08 08:31:12 -08:00
..
irq	async: Asynchronous function calls to speed up kernel boot	2009-01-07 08:45:46 -08:00
power	pm: struct device - replace bus_id with dev_name(), dev_set_name()	2009-01-06 10:44:39 -08:00
time	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2009-01-07 11:31:52 -08:00
trace	Merge branch 'cpus4096-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-01-02 11:44:09 -08:00
.gitignore
acct.c
async.c	async: don't do the initcall stuff post boot	2009-01-07 09:31:49 -08:00
audit.c	[PATCH] fix broken timestamps in AVC generated by kernel threads	2008-12-09 02:27:41 -05:00
audit.h	fixing audit rule ordering mess, part 1	2009-01-04 15:14:41 -05:00
audit_tree.c	audit: validate comparison operations, store them in sane form	2009-01-04 15:14:42 -05:00
auditfilter.c	audit: validate comparison operations, store them in sane form	2009-01-04 15:14:42 -05:00
auditsc.c	make sure that filterkey of task,always rules is reported	2009-01-04 15:14:42 -05:00
backtracetest.c
bounds.c
capability.c	Merge branch 'next' into for-linus	2009-01-07 09:58:22 +11:00
cgroup.c	cgroups: add css_tryget()	2009-01-08 08:31:10 -08:00
cgroup_debug.c
cgroup_freezer.c
compat.c	Allow times and time system calls to return small negative values	2009-01-06 15:59:13 -08:00
configs.c
cpu.c	stop_machine/cpu hotplug: fix disable_nonboot_cpus	2009-01-07 11:36:14 -08:00
cpuset.c	cpuset: remove remaining pointers to cpumask_t	2009-01-08 08:31:11 -08:00
cred-internals.h
cred.c	User namespaces: set of cleanups (v2)	2008-11-24 18:57:41 -05:00
delayacct.c	schedstat: consolidate per-task cpu runtime stats	2008-12-18 13:54:01 +01:00
dma-coherent.c	dma-coherent: catch oversized requests to dma_alloc_from_coherent()	2009-01-06 15:59:31 -08:00
dma.c
exec_domain.c
exit.c	mm: introduce get_mm_hiwater_xxx(), fix taskstats->hiwater_xxx accounting	2009-01-06 15:59:09 -08:00
extable.c	Merge branch 'core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2008-12-30 16:10:19 -08:00
fork.c	pid: generalize task_active_pid_ns	2009-01-08 08:31:12 -08:00
freezer.c
futex.c	Merge branches 'core/futexes', 'core/locking', 'core/rcu' and 'linus' into core/urgent	2009-01-06 09:32:11 +01:00
futex_compat.c
hrtimer.c	hrtimer: splitout peek ahead functionality, fix	2009-01-05 14:11:10 +01:00
itimer.c
kallsyms.c	allow stripping of generated symbols under CONFIG_KALLSYMS_ALL	2008-12-19 22:47:10 +01:00
Kconfig.freezer
Kconfig.hz
Kconfig.preempt	rcu: provide RCU options on non-preempt architectures too	2008-12-25 09:31:28 +01:00
kexec.c	cpumask: prepare for iterators to only go to nr_cpu_ids/nr_cpumask_bits.: core	2009-01-01 10:12:15 +10:30
kfifo.c
kgdb.c
kmod.c	kmod: fix varargs kernel-doc	2009-01-06 15:59:27 -08:00
kprobes.c	kprobes: support probing module __init function	2009-01-06 15:59:21 -08:00
ksysfs.c	kernel/ksysfs.c:fix dependence on CONFIG_NET	2009-01-06 10:44:31 -08:00
kthread.c	tracepoints: add DECLARE_TRACE() and DEFINE_TRACE()	2008-11-16 09:01:36 +01:00
latencytop.c	KSYM_SYMBOL_LEN fixes	2008-12-10 08:01:54 -08:00
lockdep.c	Merge branch 'core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2008-12-30 16:10:19 -08:00
lockdep_internals.h
lockdep_proc.c
Makefile	async: Asynchronous function calls to speed up kernel boot	2009-01-07 08:45:46 -08:00
marker.c	markers/tracpoints: fix non-modular build	2008-11-16 09:52:03 +01:00
module.c	async: Asynchronous function calls to speed up kernel boot	2009-01-07 08:45:46 -08:00
mutex-debug.c
mutex-debug.h
mutex.c	mutex: __used is needed for function referenced only from inline asm	2008-11-24 10:00:28 +01:00
mutex.h
notifier.c	Merge commit 'v2.6.28-rc6' into core/debug	2008-11-26 08:22:50 +01:00
ns_cgroup.c	ns_cgroup: remove unused spinlock	2009-01-08 08:31:02 -08:00
nsproxy.c	User namespaces: set of cleanups (v2)	2008-11-24 18:57:41 -05:00
panic.c	oops: increment the oops UUID every time we oops	2009-01-06 15:59:12 -08:00
params.c
pid.c	pid: generalize task_active_pid_ns	2009-01-08 08:31:12 -08:00
pid_namespace.c
pm_qos_params.c
posix-cpu-timers.c	Merge commit 'v2.6.28' into core/core	2008-12-25 13:51:46 +01:00
posix-timers.c	Merge branches 'timers/clocksource', 'timers/hpet', 'timers/hrtimers', 'timers/nohz', 'timers/ntp', 'timers/posixtimers' and 'timers/rtc' into timers/core	2008-12-25 18:02:25 +01:00
printk.c	trivial: printk: fix indentation of new_text_line declaration	2009-01-06 11:28:06 +01:00
profile.c	profile: don't include <asm/ptrace.h> twice.	2009-01-06 15:59:14 -08:00
ptrace.c	Merge branch 'tracing-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2008-12-28 12:21:10 -08:00
rcuclassic.c	cpumask: convert RCU implementations, fix	2009-01-03 18:59:25 +01:00
rcupdate.c	rcu: eliminate synchronize_rcu_xxx macro	2009-01-05 10:18:08 +01:00
rcupreempt.c	rcu: eliminate synchronize_rcu_xxx macro	2009-01-05 10:18:08 +01:00
rcupreempt_trace.c	"Tree RCU": scalable classic RCU implementation	2008-12-18 21:56:04 +01:00
rcutorture.c	rcu: fix rcutorture bug	2009-01-05 13:09:49 +01:00
rcutree.c	rcu: make treercu safe for suspend and resume	2009-01-05 10:12:33 +01:00
rcutree_trace.c	"Tree RCU": scalable classic RCU implementation	2008-12-18 21:56:04 +01:00
relay.c	relayfs: fix infinite loop with splice()	2008-12-10 08:01:52 -08:00
res_counter.c	memcg: memory cgroup resource counters for hierarchy	2009-01-08 08:31:05 -08:00
resource.c	resource: allow MMIO exclusivity for device drivers	2009-01-07 11:12:32 -08:00
rtmutex-debug.c
rtmutex-debug.h
rtmutex-tester.c
rtmutex.c
rtmutex.h
rtmutex_common.h
rwsem.c
sched.c	sched: fix possible recursive rq->lock	2009-01-07 16:10:54 +01:00
sched_clock.c	sched_clock: prevent scd->clock from moving backwards, take #2	2008-12-31 09:53:21 +01:00
sched_cpupri.c	sched: fix section mismatch	2009-01-06 11:07:15 +01:00
sched_cpupri.h	sched: convert struct cpupri_vec cpumask_var_t.	2008-11-24 17:52:22 +01:00
sched_debug.c	sched: add uid information to sched_debug for CONFIG_USER_SCHED	2008-12-01 20:39:50 +01:00
sched_fair.c	Merge branch 'linus' into sched/urgent	2009-01-05 13:53:39 +01:00
sched_features.h
sched_idletask.c
sched_rt.c	sched: put back some stack hog changes that were undone in kernel/sched.c	2009-01-03 19:00:09 +01:00
sched_stats.h	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-cpumask into merge-rr-cpumask	2009-01-03 18:53:31 +01:00
seccomp.c
semaphore.c
signal.c	SEND_SIG_NOINFO: set si_pid to tgid instead of pid	2009-01-06 15:59:29 -08:00
smp.c	cpumask: prepare for iterators to only go to nr_cpu_ids/nr_cpumask_bits.: core	2009-01-01 10:12:15 +10:30
softirq.c	Merge branch 'cpus4096-for-linus-3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-01-03 12:04:39 -08:00
softlockup.c	cpumask: convert rest of files in kernel/	2009-01-01 10:12:28 +10:30
spinlock.c
srcu.c
stacktrace.c	stacktrace: provide save_stack_trace_tsk() weak alias	2008-12-25 11:44:43 +01:00
stop_machine.c	stop_machine: introduce stop_machine_create/destroy.	2009-01-05 08:40:14 +10:30
sys.c	Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-01-06 17:10:33 -08:00
sys_ni.c	reintroduce accept4	2008-11-19 18:49:57 -08:00
sysctl.c	mm: add dirty_background_bytes and dirty_bytes sysctls	2009-01-06 15:59:03 -08:00
sysctl_check.c
taskstats.c	cpumask: convert rest of files in kernel/	2009-01-01 10:12:28 +10:30
test_kprobes.c	kprobes: add tests for register_kprobes	2009-01-06 15:59:20 -08:00
time.c	Allow times and time system calls to return small negative values	2009-01-06 15:59:13 -08:00
timeconst.pl
timer.c	[PATCH] idle cputime accounting	2008-12-31 15:11:46 +01:00
tracepoint.c	markers/tracpoints: fix non-modular build	2008-11-16 09:52:03 +01:00
tsacct.c	mm: introduce get_mm_hiwater_xxx(), fix taskstats->hiwater_xxx accounting	2009-01-06 15:59:09 -08:00
uid16.c
user.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2008-12-28 12:27:58 -08:00
user_namespace.c	User namespaces: set of cleanups (v2)	2008-11-24 18:57:41 -05:00
utsname.c
utsname_sysctl.c
wait.c
workqueue.c	cpumask: convert kernel/workqueue.c	2009-01-01 10:12:25 +10:30