linux-kernel - Re: [PATCH 1/2] clone3: add CLONE3_CLEAR

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Date:   Thu, 10 Oct 2019 17:22:30 +0200
From:   Florian Weimer <fweimer@...hat.com>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     linux-kernel@...r.kernel.org, Oleg Nesterov <oleg@...hat.com>,
        libc-alpha@...rceware.org, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Shuah Khan <shuah@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Elena Reshetova <elena.reshetova@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Roman Gushchin <guro@...com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Aleksa Sarai <cyphar@...har.com>,
        "Dmitry V. Levin" <ldv@...linux.org>,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 1/2] clone3: add CLONE3_CLEAR_SIGHAND

* Christian Brauner:

> On Thu, Oct 10, 2019 at 04:19:44PM +0200, Florian Weimer wrote:
>> * Christian Brauner:
>> 
>> > @@ -2567,7 +2572,7 @@ static bool clone3_args_valid(const struct kernel_clone_args *kargs)
>> >  	 * All lower bits of the flag word are taken.
>> >  	 * Verify that no other unknown flags are passed along.
>> >  	 */
>> > -	if (kargs->flags & ~CLONE_LEGACY_FLAGS)
>> > +	if (kargs->flags & ~(CLONE_LEGACY_FLAGS | CLONE3_CLEAR_SIGHAND))
>> >  		return false;
>> 
>> Does the comment need updating?  I feel it's a bit misleading now.
>
> Yeah, maybe just:
>
> /* Verify that no unknown flags are passed along. */
>
> ?

Sure, looks fine to me.

Thanks,
Florian