linux-kernel - Re: [PATCH v2 3/5] exec: Move cleanup of posix timers on exec out of de

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Date:   Tue, 10 Mar 2020 16:05:27 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Jann Horn <jannh@...gle.com>
Cc:     Bernd Edlinger <bernd.edlinger@...mail.de>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Kees Cook <keescook@...omium.org>,
        Jonathan Corbet <corbet@....net>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Oleg Nesterov <oleg@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Andrei Vagin <avagin@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        "Peter Zijlstra \(Intel\)" <peterz@...radead.org>,
        Yuyang Du <duyuyang@...il.com>,
        David Hildenbrand <david@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Anshuman Khandual <anshuman.khandual@....com>,
        David Howells <dhowells@...hat.com>,
        James Morris <jamorris@...ux.microsoft.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Christian Kellner <christian@...lner.me>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Aleksa Sarai <cyphar@...har.com>,
        "Dmitry V. Levin" <ldv@...linux.org>,
        "linux-doc\@vger.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fsdevel\@vger.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-mm\@kvack.org" <linux-mm@...ck.org>,
        "stable\@vger.kernel.org" <stable@...r.kernel.org>,
        "linux-api\@vger.kernel.org" <linux-api@...r.kernel.org>
Subject: Re: [PATCH v2 3/5] exec: Move cleanup of posix timers on exec out of de_thread

Jann Horn <jannh@...gle.com> writes:

> On Sun, Mar 8, 2020 at 10:39 PM Eric W. Biederman <ebiederm@...ssion.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@...ssion.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