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Oleg Nesterov 4a2c7a7837 [PATCH] make fork() atomic wrt pgrp/session signals 
Eric W. Biederman wrote:
>
> Ok. SUSV3/Posix is clear, fork is atomic with respect
> to signals.  Either a signal comes before or after a
> fork but not during. (See the rationale section).
> http://www.opengroup.org/onlinepubs/000095399/functions/fork.html
>
> The tasklist_lock does not stop forks from adding to a process
> group. The forks stall while the tasklist_lock is held, but a fork
> that began before we grabbed the tasklist_lock simply completes
> afterwards, and the child does not receive the signal.

This also means that SIGSTOP or sig_kernel_coredump() signal can't
be delivered to pgrp/session reliably.

With this patch copy_process() returns -ERESTARTNOINTR when it
detects a pending signal, fork() will be restarted transparently
after handling the signals.

This patch also deletes now unneeded "group_stop_count > 0" check,
copy_process() can no longer succeed while group stop in progress.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-By: Eric Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-28 18:36:44 -08:00
..
irq
[PATCH] warn if free_irq() is called from IRQ context
2006-03-26 08:56:53 -08:00
power
[PATCH] swswsup: return correct load_image error
2006-03-26 08:56:55 -08:00
.gitignore
gitignore: ignore more generated files
2006-01-03 11:35:26 +01:00
acct.c
[PATCH] move capable() to capability.h
2006-01-11 18:42:13 -08:00
audit.c
[PATCH] fix audit_init failure path
2006-03-20 14:08:55 -05:00
audit.h
[PATCH] sem2mutex: audit_netlink_sem
2006-03-20 14:08:55 -05:00
auditfilter.c
[PATCH] sem2mutex: audit_netlink_sem
2006-03-20 14:08:55 -05:00
auditsc.c
Merge branch 'audit.b3' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit-current
2006-03-25 09:24:53 -08:00
capability.c
[PATCH] refactor capable() to one implementation, add __capable() helper
2006-03-25 08:22:56 -08:00
compat.c
[PATCH] lightweight robust futexes: compat
2006-03-27 08:44:49 -08:00
configs.c
update the email address of Randy Dunlap
2006-01-03 13:37:51 +01:00
cpu.c
[PATCH] Notifier chain update: API changes
2006-03-27 08:44:50 -08:00
cpuset.c
[PATCH] cpuset: remove useless local variable initialization
2006-03-24 07:33:24 -08:00
dma.c
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
exec_domain.c
[PATCH] Fix module refcount leak in __set_personality()
2006-03-24 07:33:30 -08:00
exit.c
[PATCH] pids: kill PIDTYPE_TGID
2006-03-28 18:36:44 -08:00
extable.c
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
fork.c
[PATCH] make fork() atomic wrt pgrp/session signals
2006-03-28 18:36:44 -08:00
futex_compat.c
[PATCH] compat_sys_futex() warning fix
2006-03-28 09:16:09 -08:00
futex.c
[PATCH] lightweight robust futexes updates
2006-03-27 08:44:49 -08:00
hrtimer.c
[PATCH] hrtimers: remove data field
2006-03-26 08:57:03 -08:00
intermodule.c
[PATCH] missing license tag in intermodule
2006-02-05 11:06:52 -08:00
itimer.c
[PATCH] hrtimers: remove data field
2006-03-26 08:57:03 -08:00
kallsyms.c
[PATCH] fix missing includes
2005-10-30 17:37:32 -08:00
Kconfig.hz
[PATCH] i386: Selectable Frequency of the Timer Interrupt
2005-06-23 09:45:10 -07:00
Kconfig.preempt
[PATCH] sched: voluntary kernel preemption
2005-06-25 16:24:45 -07:00
kexec.c
[PATCH] move capable() to capability.h
2006-01-11 18:42:13 -08:00
kfifo.c
[PATCH] gfp flags annotations - part 1
2005-10-08 15:00:57 -07:00
kmod.c
[PATCH] wait_for_helper: trivial style cleanup
2006-03-28 18:36:41 -08:00
kprobes.c
[PATCH] kretprobe instance recycled by parent process
2006-03-26 08:57:04 -08:00
ksysfs.c
[PATCH] fix build error if CONFIG_SYSFS=n
2006-03-24 07:33:31 -08:00
kthread.c
[PATCH] find_task_by_pid() needs tasklist_lock
2006-03-25 08:22:57 -08:00
Makefile
[PATCH] lightweight robust futexes: compat
2006-03-27 08:44:49 -08:00
module.c
[PATCH] symversion warning fix
2006-03-28 09:16:02 -08:00
mutex-debug.c
[PATCH] fix/simplify mutex debugging code
2006-01-11 08:14:16 -08:00
mutex-debug.h
[PATCH] mutex subsystem, debugging code
2006-01-09 15:59:20 -08:00
mutex.c
[PATCH] mutex: trivial whitespace cleanups
2006-01-10 14:27:59 -08:00
mutex.h
[PATCH] mutex subsystem, core
2006-01-09 15:59:19 -08:00
panic.c
[PATCH] Notifier chain update: API changes
2006-03-27 08:44:50 -08:00
params.c
[PATCH] Change dash2underscore() return value to char
2006-03-28 09:16:03 -08:00
pid.c
[PATCH] pidhash: don't count idle threads
2006-03-28 18:36:41 -08:00
posix-cpu-timers.c
[PATCH] hrtimer: switch clock_nanosleep to hrtimer nanosleep API
2006-01-10 08:01:38 -08:00
posix-timers.c
[PATCH] hrtimers: remove data field
2006-03-26 08:57:03 -08:00
printk.c
[PATCH] console_setup() depends (wrongly?) on CONFIG_PRINTK
2006-03-24 07:33:27 -08:00
profile.c
[PATCH] Notifier chain update: API changes
2006-03-27 08:44:50 -08:00
ptrace.c
[PATCH] don't use REMOVE_LINKS/SET_LINKS for reparenting
2006-03-28 18:36:41 -08:00
rcupdate.c
[PATCH] rcu_process_callbacks: don't cli() while testing ->nxtlist
2006-03-24 07:33:20 -08:00
rcutorture.c
[PATCH] for_each_possible_cpu: fixes for generic part
2006-03-28 09:16:05 -08:00
relay.c
[PATCH] relay: consolidate sendfile() and read() code
2006-03-23 19:58:45 +01:00
resource.c
[PATCH] kernel/resource.c: __check_region(): remove pointless __deprecated
2006-01-10 08:02:02 -08:00
sched.c
[PATCH] for_each_possible_cpu: fixes for generic part
2006-03-28 09:16:05 -08:00
seccomp.c
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
signal.c
[PATCH] do_sigaction: don't take tasklist_lock
2006-03-28 18:36:44 -08:00
softirq.c
[PATCH] on_each_cpu(): disable local interrupts
2006-03-22 07:53:59 -08:00
softlockup.c
[PATCH] Notifier chain update: API changes
2006-03-27 08:44:50 -08:00
spinlock.c
[PATCH] BUILD_LOCK_OPS: cleanup preempt_disable() usage
2006-03-23 07:38:16 -08:00
stop_machine.c
[PATCH] Remove set_fs() in stop_machine()
2006-01-10 08:01:25 -08:00
sys_ni.c
[PATCH] lightweight robust futexes: core
2006-03-27 08:44:49 -08:00
sys.c
[PATCH] sys_times: don't take tasklist_lock
2006-03-28 18:36:43 -08:00
sysctl.c
[PATCH] Range checking in do_proc_dointvec_(userhz_)jiffies_conv
2006-03-24 07:33:20 -08:00
time.c
[PATCH] hrtimers: remove nsec_t typedef
2006-03-26 08:57:03 -08:00
timer.c
[PATCH] remove pps support
2006-03-25 08:23:02 -08:00
uid16.c
[PATCH] move capable() to capability.h
2006-01-11 18:42:13 -08:00
user.c
[PATCH] free_uid() locking improvement
2006-03-24 07:33:20 -08:00
wait.c
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
workqueue.c
[SCSI] add execute_in_process_context() API
2006-02-27 23:34:40 -06:00