From: Tejun Heo <tj@kernel.org>
To: Pedro Alves <pedro@codesourcery.com>
Cc: Denys Vlasenko <vda.linux@googlemail.com>,
oleg@redhat.com, jan.kratochvil@redhat.com,
linux-kernel@vger.kernel.org, torvalds@linux-foundation.org,
akpm@linux-foundation.org, indan@nul.nu, bdonlan@gmail.com
Subject: Re: [PATCH 03/10] ptrace: implement PTRACE_SEIZE
Date: Fri, 20 May 2011 11:12:56 +0200 [thread overview]
Message-ID: <20110520091256.GD31426@htj.dyndns.org> (raw)
In-Reply-To: <201105200956.23320.pedro@codesourcery.com>
Hello,
On Fri, May 20, 2011 at 09:56:22AM +0100, Pedro Alves wrote:
> > Ptrace API never allowed poking of running tracees.
>
> Which is a bit lame.
Lame as it may be, it would be quite challenging to change that.
> > You need to stop it first.
>
> That was my point... I was just pointing out that GDB will end
> up PTRACE_INTERRUPTing the target anyway. Maybe we could extend
> GDB's "observer" mode to be even more observer-only, and delay
> reading the DSO list and whatever else GDB does on attach until
> the first stop, or to user request. Some archs need reading
> registers as soon as possible in order to actually know which
> arch variant we've attached to. Anyway, this is GDBs business.
> SEIZE not interrupting won't hurt GDB, and is obviously useful for
> some use cases and tracers, _provided the race with SETOPTS is fixed_.
Other than the to-be-removed SIGTRAP, I don't think the trace is
observable from userland. Do you have anything specific on mind?
Thanks.
--
tejun
next prev parent reply other threads:[~2011-05-20 9:13 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-16 18:17 [PATCHSET ptrace] ptrace: implement PTRACE_SEIZE/INTERRUPT and group stop notification, take#2 Tejun Heo
2011-05-16 18:17 ` [PATCH 01/10] signal: remove three noop tracehooks Tejun Heo
2011-05-17 16:22 ` Christoph Hellwig
2011-05-17 16:27 ` Tejun Heo
2011-05-18 18:45 ` Oleg Nesterov
2011-05-19 12:11 ` Tejun Heo
2011-05-19 16:10 ` Oleg Nesterov
2011-05-16 18:17 ` [PATCH 02/10] job control: introduce JOBCTL_TRAP_STOP and use it for group stop trap Tejun Heo
2011-05-18 16:48 ` Oleg Nesterov
2011-05-18 16:57 ` Oleg Nesterov
2011-05-19 10:19 ` Tejun Heo
2011-05-19 16:19 ` Oleg Nesterov
2011-05-16 18:17 ` [PATCH 03/10] ptrace: implement PTRACE_SEIZE Tejun Heo
2011-05-18 0:40 ` Denys Vlasenko
2011-05-18 9:55 ` Tejun Heo
2011-05-18 10:44 ` Denys Vlasenko
2011-05-18 11:14 ` Tejun Heo
2011-05-19 14:17 ` Tejun Heo
2011-05-19 15:02 ` Tejun Heo
2011-05-19 19:31 ` Pedro Alves
2011-05-19 22:42 ` Denys Vlasenko
2011-05-19 23:00 ` Pedro Alves
2011-05-20 1:44 ` Denys Vlasenko
2011-05-20 8:56 ` Pedro Alves
2011-05-20 9:12 ` Tejun Heo [this message]
2011-05-20 9:07 ` Tejun Heo
2011-05-20 9:27 ` Pedro Alves
2011-05-20 9:31 ` Tejun Heo
2011-05-24 9:49 ` Pedro Alves
2011-05-24 12:00 ` Tejun Heo
2011-05-24 12:36 ` Pedro Alves
2011-05-24 14:02 ` Tejun Heo
2011-05-24 14:55 ` Pedro Alves
2011-05-25 18:18 ` Oleg Nesterov
2011-05-26 9:10 ` Tejun Heo
2011-05-26 10:01 ` Pedro Alves
2011-05-26 10:11 ` Tejun Heo
2011-05-26 14:55 ` Oleg Nesterov
2011-05-23 13:09 ` Oleg Nesterov
2011-05-23 12:43 ` Oleg Nesterov
2011-05-24 10:28 ` Tejun Heo
2011-05-25 18:29 ` Oleg Nesterov
2011-05-26 9:14 ` Tejun Heo
2011-05-26 15:01 ` Oleg Nesterov
2011-05-27 18:21 ` Tejun Heo
2011-05-30 19:22 ` Oleg Nesterov
[not found] ` <BANLkTimupSd774N-VBoswOj+Dza=5ofvWQ@mail.gmail.com>
2011-05-31 19:08 ` Oleg Nesterov
2011-05-31 21:32 ` Linus Torvalds
2011-06-01 20:04 ` Oleg Nesterov
2011-06-01 5:34 ` Tejun Heo
2011-06-01 20:08 ` Oleg Nesterov
2011-06-02 5:01 ` Tejun Heo
2011-05-18 18:17 ` Oleg Nesterov
2011-05-19 10:34 ` Tejun Heo
2011-05-16 18:17 ` [PATCH 04/10] ptrace: implement PTRACE_INTERRUPT Tejun Heo
2011-05-18 18:38 ` Oleg Nesterov
2011-05-19 12:07 ` Tejun Heo
2011-05-19 16:21 ` Oleg Nesterov
2011-05-16 18:17 ` [PATCH 05/10] ptrace: restructure ptrace_getsiginfo() Tejun Heo
2011-05-16 18:17 ` [PATCH 06/10] ptrace: add siginfo.si_pt_flags Tejun Heo
2011-05-16 18:17 ` [PATCH 07/10] ptrace: make group stop state visible via PTRACE_GETSIGINFO Tejun Heo
2011-05-19 16:27 ` Oleg Nesterov
2011-05-19 16:40 ` Tejun Heo
2011-05-16 18:17 ` [PATCH 08/10] ptrace: don't let PTRACE_SETSIGINFO override __SI_TRAP siginfo Tejun Heo
2011-05-16 18:17 ` [PATCH 09/10] ptrace: add JOBCTL_BLOCK_NOTIFY Tejun Heo
2011-05-19 16:32 ` Oleg Nesterov
2011-05-19 16:44 ` Tejun Heo
2011-05-19 16:48 ` Oleg Nesterov
2011-05-19 16:58 ` Tejun Heo
2011-05-16 18:17 ` [PATCH 10/10] ptrace: implement group stop notification for ptracer Tejun Heo
2011-05-19 16:32 ` Oleg Nesterov
2011-05-19 16:57 ` Tejun Heo
2011-05-19 17:13 ` Oleg Nesterov
2011-05-19 22:48 ` Denys Vlasenko
2011-05-20 8:59 ` Tejun Heo
2011-05-23 13:34 ` Oleg Nesterov
2011-05-20 8:46 ` Tejun Heo
2011-05-19 16:58 ` Oleg Nesterov
2011-05-23 11:45 ` Oleg Nesterov
2011-05-24 13:44 ` Tejun Heo
2011-05-24 15:44 ` Tejun Heo
2011-05-26 14:44 ` Oleg Nesterov
2011-05-28 7:32 ` Tejun Heo
2011-05-18 18:50 ` [PATCHSET ptrace] ptrace: implement PTRACE_SEIZE/INTERRUPT and group stop notification, take#2 Oleg Nesterov
2011-05-19 12:08 ` Tejun Heo
2011-05-19 15:04 ` Linus Torvalds
2011-05-19 15:19 ` Tejun Heo
2011-05-19 22:45 ` Denys Vlasenko
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