From: Pedro Alves <pedro@codesourcery.com>
To: Tejun Heo <tj@kernel.org>
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: Thu, 19 May 2011 20:31:33 +0100 [thread overview]
Message-ID: <201105192031.33569.pedro@codesourcery.com> (raw)
In-Reply-To: <20110519141728.GJ627@htj.dyndns.org>
On Thursday 19 May 2011 15:17:28, Tejun Heo wrote:
> But making SEIZE not trigger INTERRUPT and SETOPTIONS without
> requiring TRACED don't seem too difficult. Jan, would that be enough?
> Oleg, what do you think?
UUIC, that opens a race where between SEIZEing and
SETOPTIONS(O_TRACE FORK|VFORK|EXEC...), the tracee can
fork/vfork/clone/exec, without the tracer getting the
nice corresponding PTRACE_EVENT_ events.
In GDBs case, GDB will want to poke at memory
right after attaching, to at least read the
loaded DSO list, so if you can't read tracee
memory without interrupting it, you won't get much
benefit from SEIZE not interrupting.
Not to say other users wouldn't benefit.
--
Pedro Alves
next prev parent reply other threads:[~2011-05-19 19:38 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 [this message]
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
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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