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From:   ebiederm@xmission.com (Eric W. Biederman)
To:     Jann Horn <jannh@google.com>
Cc:     Bernd Edlinger <bernd.edlinger@hotmail.de>,
        Christian Brauner <christian.brauner@ubuntu.com>,
        Kees Cook <keescook@chromium.org>,
        Jonathan Corbet <corbet@lwn.net>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Andrew Morton <akpm@linux-foundation.org>,
        Alexey Dobriyan <adobriyan@gmail.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Oleg Nesterov <oleg@redhat.com>,
        Frederic Weisbecker <frederic@kernel.org>,
        Andrei Vagin <avagin@gmail.com>,
        Ingo Molnar <mingo@kernel.org>,
        "Peter Zijlstra \(Intel\)" <peterz@infradead.org>,
        Yuyang Du <duyuyang@gmail.com>,
        David Hildenbrand <david@redhat.com>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Anshuman Khandual <anshuman.khandual@arm.com>,
        David Howells <dhowells@redhat.com>,
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        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Shakeel Butt <shakeelb@google.com>,
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        Aleksa Sarai <cyphar@cyphar.com>,
        "Dmitry V. Levin" <ldv@altlinux.org>,
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Date:   Tue, 10 Mar 2020 16:05:27 -0500
In-Reply-To: <CAG48ez2aYfcwC7Sr6RseFk=PpvLAddcHsVsrTr_AS=jLvUu2KA@mail.gmail.com>
        (Jann Horn's message of "Tue, 10 Mar 2020 21:57:50 +0100")
Message-ID: <8736afsyy0.fsf@x220.int.ebiederm.org>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)
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Subject: Re: [PATCH v2 3/5] exec: Move cleanup of posix timers on exec out of de_thread
Sender: linux-kernel-owner@vger.kernel.org
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Jann Horn <jannh@google.com> writes:

> On Sun, Mar 8, 2020 at 10:39 PM Eric W. Biederman <ebiederm@xmission.com> wrote:
>> These functions have very little to do with de_thread move them out
>> of de_thread an into flush_old_exec proper so it can be more clearly
>> seen what flush_old_exec is doing.
>>
>> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
>> ---
>>  fs/exec.c | 10 +++++-----
>>  1 file changed, 5 insertions(+), 5 deletions(-)
>>
>> diff --git a/fs/exec.c b/fs/exec.c
>> index ff74b9a74d34..215d86f77b63 100644
>> --- a/fs/exec.c
>> +++ b/fs/exec.c
>> @@ -1189,11 +1189,6 @@ static int de_thread(struct task_struct *tsk)
>>         /* we have changed execution domain */
>>         tsk->exit_signal = SIGCHLD;
>>
>> -#ifdef CONFIG_POSIX_TIMERS
>> -       exit_itimers(sig);
>> -       flush_itimer_signals();
>> -#endif
>> -
>>         BUG_ON(!thread_group_leader(tsk));
>>         return 0;
>>
>> @@ -1277,6 +1272,11 @@ int flush_old_exec(struct linux_binprm * bprm)
>>         if (retval)
>>                 goto out;
>>
>> +#ifdef CONFIG_POSIX_TIMERS
>> +       exit_itimers(me->signal);
>> +       flush_itimer_signals();
>> +#endif
>
> nit: exit_itimers() has a comment referring to de_thread, that should
> probably be updated

Good point.

Eric