Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Kay Sievers 3959214f97 sched: delayed cleanup of user_struct ... During bootup performance tracing we see repeated occurrences of /sys/kernel/uid/* events for the same uid, leading to a, in this case, rather pointless userspace processing for the same uid over and over. This is usually caused by tools which change their uid to "nobody", to run without privileges to read data supplied by untrusted users. This change delays the execution of the (already existing) scheduled work, to cleanup the uid after one second, so the allocated and announced uid can possibly be re-used by another process. This is the current behavior, where almost every invocation of a binary, which changes the uid, creates two events: $ read START < /sys/kernel/uevent_seqnum; \ for i in `seq 100`; do su --shell=/bin/true bin; done; \ read END < /sys/kernel/uevent_seqnum; \ echo $(($END - $START)) 178 With the delayed cleanup, we get only two events, and userspace finishes a bit faster too: $ read START < /sys/kernel/uevent_seqnum; \ for i in `seq 100`; do su --shell=/bin/true bin; done; \ read END < /sys/kernel/uevent_seqnum; \ echo $(($END - $START)) 1 Acked-by: Dhaval Giani <dhaval@linux.vnet.ibm.com> Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>		2009-06-15 21:30:23 -07:00
..
irq	irq: slab alloc for default irq_affinity	2009-06-12 13:50:23 +03:00
power	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2009-06-14 13:46:25 -07:00
time	Merge branch 'timers-for-linus-migration' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-06-15 10:06:19 -07:00
trace	Merge branch 'timers-for-linus-migration' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-06-15 10:06:19 -07:00
.gitignore
acct.c
async.c	async: Fix lack of boot-time console due to insufficient synchronization	2009-06-08 12:31:53 -07:00
audit.c	Audit: remove spaces from audit_log_d_path	2009-04-05 13:49:04 -04:00
audit.h
audit_tree.c	Switch collect_mounts() to struct path	2009-06-11 21:36:01 -04:00
auditfilter.c	inotify: use GFP_NOFS in kernel_event() to work around a lockdep false-positive	2009-05-06 16:36:09 -07:00
auditsc.c	Audit: remove spaces from audit_log_d_path	2009-04-05 13:49:04 -04:00
backtracetest.c
bounds.c
capability.c
cgroup.c	Push BKL down into ->remount_fs()	2009-06-11 21:36:11 -04:00
cgroup_debug.c
cgroup_freezer.c
compat.c	signals: implement sys_rt_tgsigqueueinfo	2009-04-30 19:24:24 +02:00
configs.c
cpu.c
cpuset.c	x86: remove some alloc_bootmem_cpumask_var calling	2009-06-11 19:27:07 +03:00
cred-internals.h
cred.c	CRED: Rename cred_exec_mutex to reflect that it's a guard against ptrace	2009-05-11 08:15:36 +10:00
delayacct.c
dma-coherent.c
dma.c
exec_domain.c
exit.c	Merge branch 'perfcounters-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-06-11 14:01:07 -07:00
extable.c	Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-04-05 11:04:19 -07:00
fork.c	Merge branch 'linus' into perfcounters/core	2009-06-11 17:55:42 +02:00
freezer.c
futex.c	futex: fix restart in wait_requeue_pi	2009-05-20 10:34:32 +02:00
futex_compat.c
hrtimer.c	clocksource: prevent selection of low resolution clocksourse also for nohz=on	2009-06-13 12:00:26 +02:00
hung_task.c
itimer.c
kallsyms.c	kernel/kallsyms.c: replace deprecated __initcall with device_initcall and fix whitespace	2009-06-09 22:37:52 +02:00
Kconfig.freezer
Kconfig.hz
Kconfig.preempt
kexec.c	PM core: rename suspend and resume functions	2009-06-12 21:32:31 +02:00
kfifo.c
kgdb.c	sysrq, intel_fb: fix sysrq g collision	2009-05-15 07:56:24 -05:00
kmod.c	kmod: Release sub_info on cred allocation failure.	2009-05-26 12:11:19 -07:00
kprobes.c	kprobes: fix to use text_mutex around arm/disarm kprobe	2009-05-08 16:23:48 -07:00
ksysfs.c
kthread.c	tracing/events: move trace point headers into include/trace/events	2009-04-14 22:05:43 -04:00
latencytop.c
lockdep.c	Merge branch 'linus' into tracing/core	2009-05-07 11:17:34 +02:00
lockdep_internals.h	lockdep: increase MAX_LOCKDEP_ENTRIES and MAX_LOCKDEP_CHAINS	2009-05-12 19:59:52 +02:00
lockdep_proc.c
lockdep_states.h
Makefile	Merge branch 'linus' into perfcounters/core	2009-06-11 17:55:42 +02:00
marker.c
module.c	module: trim exception table on init free.	2009-06-12 21:47:04 +09:30
mutex-debug.c
mutex-debug.h
mutex.c	Merge branch 'linus' into perfcounters/core	2009-06-11 17:55:42 +02:00
mutex.h
notifier.c
ns_cgroup.c
nsproxy.c
panic.c	Fix caller information for warn_slowpath_null	2009-05-16 13:41:28 -07:00
params.c	module_param: allow 'bool' module_params to be bool, not just int.	2009-06-12 21:46:58 +09:30
perf_counter.c	perf_counter: Add forward/backward attribute ABI compatibility	2009-06-12 14:28:52 +02:00
pid.c
pid_namespace.c
pm_qos_params.c
posix-cpu-timers.c	kernel/posix-cpu-timers.c: fix sparse warning	2009-04-30 08:08:31 +02:00
posix-timers.c
printk.c	Merge branch 'printk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-04-05 10:23:25 -07:00
profile.c	x86: remove some alloc_bootmem_cpumask_var calling	2009-06-11 19:27:07 +03:00
ptrace.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6	2009-06-11 10:01:41 -07:00
rcuclassic.c
rcupdate.c	RCU: Don't try and predeclare inline funcs as it upsets some versions of gcc	2009-04-15 13:55:14 -07:00
rcupreempt.c	rcu: rcu_sched_grace_period(): kill the bogus flush_signals()	2009-05-05 20:28:05 +02:00
rcupreempt_trace.c
rcutorture.c
rcutree.c	rcu: Add __rcu_pending tracing to hierarchical RCU	2009-04-14 11:33:43 +02:00
rcutree.h
rcutree_trace.c	rcu: Add __rcu_pending tracing to hierarchical RCU	2009-04-14 11:33:43 +02:00
relay.c	Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-04-05 11:04:19 -07:00
res_counter.c
resource.c	Remove 'recurse into child resources' logic from 'reserve_region_with_split()'	2009-04-18 21:44:24 -07:00
rtmutex-debug.c
rtmutex-debug.h
rtmutex-tester.c
rtmutex.c	trivial: fix ETIMEOUT -> ETIMEDOUT typos	2009-06-12 18:01:50 +02:00
rtmutex.h
rtmutex_common.h	rt_mutex: add proxy lock routines	2009-04-06 11:14:02 +02:00
rwsem.c
sched.c	Merge branch 'timers-for-linus-migration' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-06-15 10:06:19 -07:00
sched_clock.c	sched: Fix fallback sched_clock()'s offset when using jiffies	2009-05-09 10:08:19 +02:00
sched_cpupri.c	sched: use slab in cpupri_init()	2009-06-11 19:27:12 +03:00
sched_cpupri.h
sched_debug.c
sched_fair.c	sched: remove redundant hierarchy walk in check_preempt_wakeup	2009-04-09 08:19:08 +02:00
sched_features.h
sched_idletask.c	sched, timers: move calc_load() to scheduler	2009-05-15 15:32:45 +02:00
sched_rt.c	cpumask: alloc zeroed cpumask for static cpumask_var_ts	2009-06-09 22:30:27 +09:30
sched_stats.h
seccomp.c
semaphore.c
signal.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6	2009-06-11 10:01:41 -07:00
slow-work.c	slow_work_thread() should do the exclusive wait	2009-06-11 11:26:38 -07:00
smp.c	cpumask: alloc zeroed cpumask for static cpumask_var_ts	2009-06-09 22:30:27 +09:30
softirq.c	Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-06-10 19:53:40 -07:00
softlockup.c
spinlock.c
srcu.c
stacktrace.c
stop_machine.c
sys.c	Merge branch 'linus' into perfcounters/core	2009-04-29 14:47:05 +02:00
sys_ni.c
sysctl.c	Merge branch 'timers-for-linus-migration' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-06-15 10:06:19 -07:00
sysctl_check.c
taskstats.c
test_kprobes.c
time.c
timeconst.pl
timer.c	Merge branch 'timers-for-linus-migration' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-06-15 10:06:19 -07:00
tracepoint.c
tsacct.c
uid16.c
up.c
user.c	sched: delayed cleanup of user_struct	2009-06-15 21:30:23 -07:00
user_namespace.c
utsname.c
utsname_sysctl.c
wait.c	wait: don't use __wake_up_common()	2009-04-14 17:17:16 +02:00
workqueue.c	ftrace, workqueuetrace: make workqueue tracepoints use TRACE_EVENT macro	2009-06-02 01:10:40 +02:00