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

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Message-ID: <202003101313.CF8CBDC582@keescook>
Date:   Tue, 10 Mar 2020 13:16:29 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Christian Brauner <christian.brauner@...ntu.com>,
        Bernd Edlinger <bernd.edlinger@...mail.de>,
        Jann Horn <jannh@...gle.com>, 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@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-api@...r.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

On Mon, Mar 09, 2020 at 03:48:55PM -0500, Eric W. Biederman wrote:
> And I completely agree that we should at least rename tsk to me.
> Just for clarity.

I think it wouldn't hurt to add comments to spell it out explicitly
in each of the tsk->me functions, something like:

/*
 * The "me" task_struct argument here must only ever refer to "current",
 * but it gets passed in to avoid re-calculating "current" in each helper.
 */

I've found that the exec code in its entirety would be better off with
more comments. :) Usually that's the bulk of what I find myself adding
when I make changes in this area. ;)

-Kees

-- 
Kees Cook