[PATCHSET ptrace] ptrace: implement PTRACE_SEIZE/INTERRUPT and group stop notification, take#3

[Tejun Heo]

Hello,

This is the third try at implementing PTRACE_SEIZE/INTERRUPT and group
stop notification.  This patchset contains both the prep and the
actual implementation patches.  Changes from the second take[1][2]
are,

- 0008-ptrace-move-JOBCTL_TRAPPING-wait-to-wait-2-and-ptrac.patch:

  wait_task_stopped() syscall restart fixed such that -ERESTARTSYS is
  used for !WNOHANG waits.

- 0006-job-control-introduce-task_set_jobctl_pending.patch:

  Added to address Oleg's concern that setting trap conditions on
  dying task may make it unkillable.  task_set_jobctl_pending() is
  always used when raising stop/trap conditions and becomes noop if
  target task is dying.  0011, 0013 and 0019 updated to use
  task_set_jobctl_pending().

- 0012-ptrace-implement-PTRACE_SEIZE.patch:

  PTRACE_SEIZE no longer traps the tracee automatically as suggested
  by Jan Kratochvil.  If tracee is running, it's left running.

- 0016-ptrace-make-group-stop-state-visible-via-PTRACE_GETS.patch:
- 0018-ptrace-add-JOBCTL_BLOCK_NOTIFY.patch:-v2:

  Cosmetic updates as per review.

This patchset contains the following 19 patches.

  0001-job-control-rename-signal-group_stop-and-flags-to-jo.patch
  0002-ptrace-ptrace_check_attach-rename-kill-to-ignore_sta.patch
  0003-ptrace-relocate-set_current_state-TASK_TRACED-in-ptr.patch
  0004-job-control-introduce-JOBCTL_PENDING_MASK-and-task_c.patch
  0005-job-control-make-task_clear_jobctl_pending-clear-TRA.patch
  0006-job-control-introduce-task_set_jobctl_pending.patch
  0007-ptrace-use-bit_waitqueue-for-TRAPPING-instead-of-wai.patch
  0008-ptrace-move-JOBCTL_TRAPPING-wait-to-wait-2-and-ptrac.patch
  0009-ptrace-make-TRAPPING-wait-interruptible.patch
  0010-signal-remove-three-noop-tracehooks.patch
  0011-job-control-introduce-JOBCTL_TRAP_STOP-and-use-it-fo.patch
  0012-ptrace-implement-PTRACE_SEIZE.patch
  0013-ptrace-implement-PTRACE_INTERRUPT.patch
  0014-ptrace-restructure-ptrace_getsiginfo.patch
  0015-ptrace-add-siginfo.si_pt_flags.patch
  0016-ptrace-make-group-stop-state-visible-via-PTRACE_GETS.patch
  0017-ptrace-don-t-let-PTRACE_SETSIGINFO-override-__SI_TRA.patch
  0018-ptrace-add-JOBCTL_BLOCK_NOTIFY.patch
  0019-ptrace-implement-group-stop-notification-for-ptracer.patch

and available in the following git branch.

  git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git review-ptrace-seize

The HEAD is 6e3eb3ab5f (ptrace: implement group stop notification for
ptracer).  If you see older branch, please retry after a while (korg
is still syncing).

The patchset is on top of today's (20110524) mainline -
d762f438310 (Merge branch 'sh-latest' of
git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6).

diffstat follows.

 arch/ia64/include/asm/siginfo.h       |    7 
 arch/ia64/kernel/signal.c             |    5 
 arch/mips/include/asm/compat-signal.h |    7 
 arch/mips/include/asm/siginfo.h       |    7 
 arch/mips/kernel/signal32.c           |    5 
 arch/parisc/kernel/signal32.c         |    5 
 arch/parisc/kernel/signal32.h         |    7 
 arch/powerpc/kernel/ppc32.h           |    7 
 arch/powerpc/kernel/signal_32.c       |    5 
 arch/s390/kernel/compat_linux.h       |    7 
 arch/s390/kernel/compat_signal.c      |    5 
 arch/sparc/kernel/signal32.c          |   12 +
 arch/tile/kernel/compat_signal.c      |   11 +
 arch/x86/ia32/ia32_signal.c           |    4 
 arch/x86/include/asm/ia32.h           |    7 
 fs/exec.c                             |    2 
 include/asm-generic/siginfo.h         |   10 
 include/linux/ptrace.h                |   16 +
 include/linux/sched.h                 |   28 +-
 include/linux/tracehook.h             |   52 ----
 kernel/exit.c                         |   27 ++
 kernel/ptrace.c                       |  302 +++++++++++++++++++++++----
 kernel/signal.c                       |  370 ++++++++++++++++++++++------------
 23 files changed, 672 insertions(+), 236 deletions(-)

--
tejun

[1] http://thread.gmane.org/gmane.linux.kernel/1139751
[2] http://thread.gmane.org/gmane.linux.kernel/1140778
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