linux-kernel - Re: [PATCH] pid: Allow creation of pidfds to threads

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Message-ID: <11982900.O9o76ZdvQC@genesis>
Date:   Thu, 14 Apr 2022 10:11:40 +0200
From:   Alois Wohlschlager <alwoju@....de>
To:     Christian Brauner <brauner@...nel.org>,
        Matthew Bobrowski <repnop@...gle.com>
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Alexey Gladkov <legion@...nel.org>,
        Jens Axboe <axboe@...nel.dk>,
        David Hildenbrand <david@...hat.com>,
        Rolf Eike Beer <eb@...ix.com>,
        Ran Xiaokai <ran.xiaokai@....com.cn>, Jan Kara <jack@...e.cz>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pid: Allow creation of pidfds to threads

Am Mittwoch, 13. April 2022, 06:46:20 CEST schrieb Matthew Bobrowski:
> For the fanotify API i.e. FAN_REPORT_PIDFD, I don't see there being
> any issues with supporting/returning pidfds which belong to
> non-thread-group leaders. In saying that, for this to be useful from
> the fanotify API POV, I definitely do think we should consider
> supporting the ability to send thread-specific signals via
> pidfd_send_signal(). Adding this extension through the optional flag
> parameter makes sense to me.

I actually started implementing this, but then took it out again because I
couldn't think of a use case. Now that one has been found, I can bring it back
in a v2.

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