ptrace changes for v3.1

Linus,

please pull from

git://git.kernel.org/pub/scm/linux/kernel/git/oleg/misc.git ptrace

More ptrace/jobctl fixes plus PTRACE_SEIZE/PTRACE_LISTEN functionality from Tejun.

Note:

- f701e5b7 "connector: add an event for monitoring process tracers" is a bit off-topic, it was routed via ptrace branch because it textually depends on the changes in tracehook/ptrace_attach code.

- a288eecc "ptrace: kill trivial tracehooks" has the simple conflicts with 248bed4b "[S390] use siginfo for sigtrap signals" pending in s390 tree, hopefully this is trivial to resolve.

Assuming you didn't pulled s390 yet: s390 version supercedes, only

- tracehook_consider_fatal_signal
+ current->ptrace

chunk in arch/s390/kernel/traps.c should be dropped because this was already done by a288eecc

Denys Vlasenko (1):
ptrace: make former thread ID available via PTRACE_GETEVENTMSG after PTRACE_EVENT_EXEC stop

Oleg Nesterov (17):
make do_notify_parent() return bool
kill tracehook_notify_death()
__ptrace_detach: avoid task_detached(), check do_notify_parent() make do_notify_parent() __must_check, update the callers
reparent_leader: check EXIT_DEAD instead of task_detached() kill task_detached()
do not change dead_task->exit_signal
redefine thread_group_leader() as exit_signal >= 0
ptrace: ptrace_reparented() should check same_thread_group()
ptrace: kill real_parent_is_ptracer() in in favor of ptrace_reparented()
ptrace: wait_consider_task: s/same_thread_group/ptrace_reparented/
has_stopped_jobs: s/task_is_stopped/SIGNAL_STOP_STOPPED/
ptrace_init_task: initialize child->jobctl explicitly
ptrace: mv send-SIGSTOP from do_fork() to ptrace_init_task()
ptrace: dont send SIGSTOP on auto-attach if PT_SEIZED
ptrace: fix ptrace_signal() && STOP_DEQUEUED interaction
ptrace: do_wait(traced_leader_killed_by_mt_exec) can block forever

Tejun Heo (20):
ptrace: remove silly wait_trap variable from ptrace_attach()
job control: rename signal->group_stop and flags to jobctl and update them
ptrace: ptrace_check_attach(): rename @kill to @ignore_state and add comments
ptrace: relocate set_current_state(TASK_TRACED) in ptrace_stop()
job control: introduce JOBCTL_PENDING_MASK and task_clear_jobctl_pending()
job control: make task_clear_jobctl_pending() clear TRAPPING automatically
job control: introduce task_set_jobctl_pending()
ptrace: use bit_waitqueue for TRAPPING instead of wait_chldexit
signal: remove three noop tracehooks
job control: introduce JOBCTL_TRAP_STOP and use it for group stop trap
ptrace: implement PTRACE_SEIZE
ptrace: implement PTRACE_INTERRUPT
ptrace: implement TRAP_NOTIFY and use it for group stop events
ptrace: implement PTRACE_LISTEN
ptrace: kill task_ptrace()
ptrace: introduce ptrace_event_enabled() and simplify ptrace_event() and tracehook_prepare_clone()
ptrace: move SIGTRAP on exec(2) logic to ptrace_event()
ptrace: kill trivial tracehooks
ptrace: kill clone/exec tracehooks
ptrace: s/tracehook_tracer_task()/ptrace_parent()/

Vladimir Zapolskiy (1):
connector: add an event for monitoring process tracers

 arch/s390/kernel/traps.c    |    4 +-
 drivers/connector/cn_proc.c |   35 ++++
 fs/exec.c                   |   27 +++-
 fs/proc/array.c             |    2 +-
 fs/proc/base.c              |    2 +-
 include/linux/cn_proc.h     |   13 ++
 include/linux/ptrace.h      |  104 ++++++++---
 include/linux/sched.h       |   52 ++++--
 include/linux/tracehook.h   |  385 +--------------------------------------
 kernel/exit.c               |   91 ++++-----
 kernel/fork.c               |   33 +++-
 kernel/ptrace.c             |  197 ++++++++++++++++----
 kernel/signal.c             |  425 +++++++++++++++++++++++++++----------------
 mm/nommu.c                  |    3 +-
 mm/oom_kill.c               |    3 +-
 security/apparmor/domain.c  |    2 +-
 security/selinux/hooks.c    |    4 +-
 17 files changed, 674 insertions(+), 708 deletions(-)

Please do not actually add anything to the connector code. It's a horrible interface and users should migrate away from it.

and migrate to <what>, please??

---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***

(add Evgeniy)

I never understood who can use this interface and for what. But it has users.

As for this patch. This feature was acked by maintainers, I do not think I can argue. Fortunately, the patch adds nothing without CONFIG_PROC_EVENTS.

Oleg.

Besides usual drugs, what else this is all about?

	Evgeniy Polyakov