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Oleg Nesterov 12a3de0a96 pids: sys_getpgid: fix unsafe *pid usage, s/tasklist/rcu/ 
1. sys_getpgid() needs rcu_read_lock() to derive the pgrp _nr, even if
   the task is current, otherwise we can race with another thread which
   does sys_setpgid().

2. Use rcu_read_lock() instead of tasklist_lock when pid != 0, make sure
   that we don't use the NULL pid if the task exits right after successful
   find_task_by_vpid().

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-30 08:29:49 -07:00
..
irq
kernel: explicitly include required header files under kernel/
2008-04-29 08:06:04 -07:00
power
PM/gxfb: add hook to PM console layer that allows disabling of suspend VT switch
2008-04-28 08:58:36 -07:00
time
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
.gitignore
…
acct.c
bsd_acct: using task_struct->tgid is not right in pid-namespaces
2008-03-24 19:22:20 -07:00
audit_tree.c
…
audit.c
[patch 2/2] Use find_task_by_vpid in audit code
2008-04-28 06:28:30 -04:00
audit.h
[PATCH 1/2] audit: move extern declarations to audit.h
2008-04-28 06:28:04 -04:00
auditfilter.c
Merge branch 'audit.b50' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit-current
2008-04-29 11:41:22 -07:00
auditsc.c
[PATCH] new predicate - AUDIT_FILETYPE
2008-04-28 06:28:37 -04:00
backtracetest.c
…
bounds.c
Add kbuild.h that contains common definitions for kbuild users
2008-04-29 08:06:29 -07:00
capability.c
…
cgroup_debug.c
CGroup API files: move "releasable" to cgroup_debug subsystem
2008-04-29 08:06:09 -07:00
cgroup.c
cgroups: add an owner to the mm_struct
2008-04-29 08:06:10 -07:00
compat.c
signals: add set_restore_sigmask
2008-04-30 08:29:37 -07:00
configs.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
cpu.c
simplify cpu_hotplug_begin()/put_online_cpus()
2008-04-29 08:06:11 -07:00
cpuset.c
Cpuset hardwall flag: add a mem_hardwall flag to cpusets
2008-04-29 08:06:11 -07:00
delayacct.c
…
dma.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
exec_domain.c
…
exit.c
pids: __set_special_pids: use change_pid() helper
2008-04-30 08:29:49 -07:00
extable.c
…
fork.c
signals: microoptimize the usage of ->curr_target
2008-04-30 08:29:35 -07:00
futex_compat.c
futex_compat __user annotation
2008-03-30 14:18:41 -07:00
futex.c
NULL noise: fs/*, mm/*, kernel/*
2008-03-30 14:18:41 -07:00
hrtimer.c
hrtimer: raise softirq unlocked to avoid circular lock dependency
2008-04-28 22:22:21 +02:00
itimer.c
…
kallsyms.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
Kconfig.hz
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Kconfig.preempt
rcu: move PREEMPT_RCU config option back under PREEMPT
2008-03-10 18:01:20 -07:00
kexec.c
vmcoreinfo: add page flags values
2008-04-28 08:58:23 -07:00
kfifo.c
…
kgdb.c
kgdb: always use icache flush for sw breakpoints
2008-04-17 20:05:43 +02:00
kmod.c
generic: use new set_cpus_allowed_ptr function
2008-04-19 19:44:58 +02:00
kprobes.c
kprobes: add (un)register_jprobes for batch registration
2008-04-28 08:58:32 -07:00
ksysfs.c
…
kthread.c
Deprecate find_task_by_pid()
2008-04-30 08:29:48 -07:00
latencytop.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
lockdep_internals.h
…
lockdep_proc.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
lockdep.c
…
Makefile
sysctl: allow embedded targets to disable sysctl_check.c
2008-04-29 08:06:22 -07:00
marker.c
kernel: explicitly include required header files under kernel/
2008-04-29 08:06:04 -07:00
module.c
kernel: Remove unnecessary inclusions of asm/semaphore.h
2008-04-18 22:17:04 -04:00
mutex-debug.c
…
mutex-debug.h
…
mutex.c
…
mutex.h
…
notifier.c
ipc: re-enable msgmni automatic recomputing msgmni if set to negative
2008-04-29 08:06:13 -07:00
ns_cgroup.c
cgroups: kernel/ns_cgroup.c should #include <linux/nsproxy.h>
2008-04-29 08:06:07 -07:00
nsproxy.c
ipc: sysvsem: refuse clone(CLONE_SYSVSEM|CLONE_NEWIPC)
2008-04-29 08:06:14 -07:00
panic.c
Taint kernel after WARN_ON(condition)
2008-04-29 08:05:59 -07:00
params.c
…
pid_namespace.c
kernel: fix integer as NULL pointer warnings
2008-04-28 17:29:18 -07:00
pid.c
pids: introduce change_pid() helper
2008-04-30 08:29:48 -07:00
pm_qos_params.c
…
posix-cpu-timers.c
posix-timers: fix shadowed variables
2008-04-17 12:22:30 +02:00
posix-timers.c
signals: join send_sigqueue() with send_group_sigqueue()
2008-04-30 08:29:36 -07:00
printk.c
tty: The big operations rework
2008-04-30 08:29:47 -07:00
profile.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
ptrace.c
ptrace: permit ptracing of /sbin/init
2008-04-30 08:29:38 -07:00
rcuclassic.c
…
rcupdate.c
…
rcupreempt_trace.c
…
rcupreempt.c
generic: reduce stack pressure in sched_affinity
2008-04-19 19:44:59 +02:00
rcutorture.c
kernel: explicitly include required header files under kernel/
2008-04-29 08:06:04 -07:00
relay.c
Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block
2008-04-29 08:18:03 -07:00
res_counter.c
memcgroup: add the max_usage member on the res_counter
2008-04-29 08:06:10 -07:00
resource.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
rtmutex_common.h
…
rtmutex-debug.c
…
rtmutex-debug.h
…
rtmutex-tester.c
…
rtmutex.c
…
rtmutex.h
…
rwsem.c
…
sched_debug.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
sched_fair.c
sched: debug: show a weight tree
2008-04-19 19:45:00 +02:00
sched_features.h
sched: /debug/sched_features
2008-04-19 19:45:00 +02:00
sched_idletask.c
…
sched_rt.c
sched: rt-group: optimize dequeue_rt_stack
2008-04-19 19:45:00 +02:00
sched_stats.h
cpumask: use new cpus_scnprintf function
2008-04-19 19:44:59 +02:00
sched.c
CGroups _s64 files: use read_s64/write_s64 in CFS cgroup for rt_runtime file
2008-04-29 08:06:09 -07:00
seccomp.c
…
semaphore.c
Improve semaphore documentation
2008-04-17 10:43:01 -04:00
signal.c
signals: add set_restore_sigmask
2008-04-30 08:29:37 -07:00
softirq.c
tasklets: execute tasklets in the same order they were queued
2008-04-19 19:44:58 +02:00
softlockup.c
softlockup: fix task state setting
2008-02-29 18:46:53 +01:00
spinlock.c
…
srcu.c
…
stacktrace.c
…
stop_machine.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/juhl/trivial
2008-04-21 16:36:46 -07:00
sys_ni.c
…
sys.c
pids: sys_getpgid: fix unsafe *pid usage, s/tasklist/rcu/
2008-04-30 08:29:49 -07:00
sysctl_check.c
…
sysctl.c
sysctl: add the ->permissions callback on the ctl_table_root
2008-04-29 08:06:23 -07:00
taskstats.c
Use find_task_by_vpid in taskstats
2008-04-30 08:29:48 -07:00
test_kprobes.c
…
time.c
kernel: explicitly include required header files under kernel/
2008-04-29 08:06:04 -07:00
timeconst.pl
…
timer.c
timers: simplify lockdep handling
2008-04-17 12:22:31 +02:00
tsacct.c
…
uid16.c
asmlinkage_protect replaces prevent_tail_call
2008-04-10 17:28:26 -07:00
user_namespace.c
eCryptfs: make key module subsystem respect namespaces
2008-04-29 08:06:07 -07:00
user.c
keys: don't generate user and user session keyrings unless they're accessed
2008-04-29 08:06:17 -07:00
utsname_sysctl.c
…
utsname.c
kernel: explicitly include required header files under kernel/
2008-04-29 08:06:04 -07:00
wait.c
…
workqueue.c
cleanup_workqueue_thread: remove the unneeded "cpu" parameter
2008-04-29 08:06:11 -07:00