linux-kernel - Re: [PATCH 1/2] exec: Properly mark the point of no return

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Message-ID: <87v9nh9zfz.fsf@x220.int.ebiederm.org>
Date:   Fri, 06 Mar 2020 11:16:00 -0600
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Bernd Edlinger <bernd.edlinger@...mail.de>
Cc:     Christian Brauner <christian.brauner@...ntu.com>,
        Kees Cook <keescook@...omium.org>,
        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\@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 1/2] exec: Properly mark the point of no return

Bernd Edlinger <bernd.edlinger@...mail.de> writes:

> On 3/6/20 6:09 AM, Eric W. Biederman wrote:
>> Bernd Edlinger <bernd.edlinger@...mail.de> writes:
>> 
>>> On 3/5/20 10:15 PM, Eric W. Biederman wrote:
>>>>
>>>> Add a flag binfmt->unrecoverable to mark when execution has gotten to
>>>> the point where it is impossible to return to userspace with the
>>>> calling process unchanged.
>>>>
>>>> While techinically this state starts as soon as de_thread starts
>
> typo: s/techinically/technically/

>>>> killing threads, the only return path at that point is if there is a
>>>> fatal signal pending.  I have choosen instead to set unrecoverable
>
> I'm not good at english, is this chosen ?
>

Yes.  Defintley worth fixing.

Eric