From: Pedro Alves <palves@redhat.com>
To: Tom Tromey <tromey@redhat.com>
Cc: Gary Benson <gbenson@redhat.com>,
gdb-patches@sourceware.org, Doug Evans <dje@google.com>
Subject: Re: [PATCH 2/3 v4] Remove some GDBSERVER checks from linux-ptrace
Date: Thu, 24 Jul 2014 14:17:00 -0000 [thread overview]
Message-ID: <53D1149A.101@redhat.com> (raw)
In-Reply-To: <87oaweonp4.fsf@fleche.redhat.com>
On 07/24/2014 03:07 PM, Tom Tromey wrote:
>>>>>> "Pedro" == Pedro Alves <palves@redhat.com> writes:
>
>>> + current_ptrace_options |= PTRACE_O_TRACECLONE |
>>> + (additional_flags & ~(PTRACE_O_TRACESYSGOOD
>>> + | PTRACE_O_TRACEVFORKDONE));
>
> Pedro> This isn't right. That enables e.g., PTRACE_O_TRACEEXIT, for example,
> Pedro> and possibly invalid flags even.
>
> I don't see how that can happen. I think the "&" prevents it.
If the caller puts PTRACE_O_TRACEEXIT in additional_flags, that'll
enable it, even though that's not what the test that led to that
code was making sure the kernel supported.
(PTRACE_O_TRACEEXIT was added to the kernel at the same time as
PTRACE_EVENT_VFORK_DONE, not the fork/exec flags).
--
Thanks,
Pedro Alves
next prev parent reply other threads:[~2014-07-24 14:13 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-24 12:51 [PATCH 0/3 v4] Common code cleanups (part 1) Gary Benson
2014-07-24 12:51 ` [PATCH 2/3 v4] Remove some GDBSERVER checks from linux-ptrace Gary Benson
2014-07-24 13:25 ` Pedro Alves
2014-07-24 14:09 ` Tom Tromey
2014-07-24 14:17 ` Pedro Alves [this message]
2014-07-24 14:13 ` [PATCH 2/3 v5] " Gary Benson
2014-07-24 14:25 ` Pedro Alves
2014-07-24 15:05 ` Gary Benson
2014-07-24 12:51 ` [PATCH 1/3 v4] Introduce common/errors.h Gary Benson
2014-07-24 13:24 ` Pedro Alves
2014-07-24 18:03 ` Doug Evans
2014-07-25 8:51 ` Gary Benson
2014-07-25 10:32 ` Pedro Alves
2014-07-25 11:38 ` Gary Benson
2014-07-25 12:13 ` Pedro Alves
2014-07-25 13:34 ` Gary Benson
2014-07-29 16:44 ` Doug Evans
2014-07-29 17:45 ` Pedro Alves
2014-07-30 9:43 ` Gary Benson
2014-07-25 10:19 ` Pedro Alves
2014-07-24 17:52 ` Doug Evans
2014-07-24 22:39 ` Doug Evans
2014-07-25 9:34 ` Gary Benson
2014-07-28 20:16 ` Doug Evans
2014-07-24 13:08 ` [PATCH 3/3 v4] Make gdbserver CORE_ADDR unsigned Gary Benson
2014-07-24 13:36 ` Pedro Alves
2014-07-24 14:07 ` Gary Benson
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