From: ebiederm@xmission.com (Eric W. Biederman)
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Oleg Nesterov <oleg@redhat.com>, Jann Horn <jannh@google.com>,
Kees Cook <keescook@chromium.org>,
Bernd Edlinger <bernd.edlinger@hotmail.de>
Subject: Re: [PATCH 1/2] exec: Don't set group_exit_task during a coredump
Date: Mon, 22 Jun 2020 11:20:11 -0500 [thread overview]
Message-ID: <87eeq7xebo.fsf@x220.int.ebiederm.org> (raw)
In-Reply-To: <CAHk-=wgczNRMP-DK3Ga-e_HXvZMBbQNxthdGt=MqMZ0CFDHHcg@mail.gmail.com> (Linus Torvalds's message of "Sat, 20 Jun 2020 11:58:13 -0700")
Linus Torvalds <torvalds@linux-foundation.org> writes:
> On Fri, Jun 19, 2020 at 11:36 AM Eric W. Biederman
> <ebiederm@xmission.com> wrote:
>>
>> Instead test SIGNAL_GROUP_COREDUMP in signal_group_exit().
>
> You say "instead", but the patch itself doesn't agree:
>
>> static inline int signal_group_exit(const struct signal_struct *sig)
>> {
>> - return (sig->flags & SIGNAL_GROUP_EXIT) ||
>> + return (sig->flags & (SIGNAL_GROUP_EXIT | SIGNAL_GROUP_COREDUMP)) ||
>> (sig->group_exit_task != NULL);
>> }
>
> it does it _in_addition_to_.
Hmm. I think I can change that line to:
>> Instead add a test for SIGNAL_GROUP_COREDUMP in signal_group_exit().
Does that read better?
> I think the whole test for "sig->group_exit_task != NULL" should be
> removed for this commit to make sense.
The code change is designed not to have a behavioral change in
signal_group_exit(). As de_thread also sets sig->group_exit_task
the test for sig->group_exit_task needs to remain in signal_group_exit()
for the behavior of signal_group_exit() to remain unchanged.
Why do you think the test sig->group_exit_task != NULL should be removed
for the commit to make sense?
Eric
next prev parent reply other threads:[~2020-06-22 16:24 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-19 18:30 [PATCH 0/2] exec: s/group_exit_task/group_exec_task/ for clarity Eric W. Biederman
2020-06-19 18:32 ` [PATCH 1/2] exec: Don't set group_exit_task during a coredump Eric W. Biederman
2020-06-20 18:58 ` Linus Torvalds
2020-06-22 16:20 ` Eric W. Biederman [this message]
2020-06-22 16:32 ` Linus Torvalds
2020-06-22 11:25 ` Oleg Nesterov
2020-06-19 18:33 ` [PATCH 2/2] exec: Rename group_exit_task group_exec_task and correct the Documentation Eric W. Biederman
2020-06-23 21:52 ` [PATCH v2 0/6] exec: s/group_exit_task/group_exec_task/ for clarity Eric W. Biederman
2020-06-23 21:53 ` [PATCH v2 1/6] signal: Pretty up the SIGNAL_GROUP_FLAGS Eric W. Biederman
2020-06-23 21:54 ` [PATCH v2 2/6] exec: Lock more defensively in exec Eric W. Biederman
2020-06-23 21:54 ` [PATCH v2 3/6] signal: Implement SIGNAL_GROUP_DETHREAD Eric W. Biederman
2020-06-23 21:55 ` [PATCH v2 4/6] signal: In signal_group_exit remove the group_exit_task test Eric W. Biederman
2020-06-23 21:55 ` [PATCH v2 5/6] coredump: Stop using group_exit_task Eric W. Biederman
2020-06-23 21:56 ` [PATCH v2 6/6] exec: Rename group_exit_task group_exec_task and correct the Documentation Eric W. Biederman
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