linux-kernel - Re: [PATCH v2] signal: add procfd

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Message-ID: <87y392h4b7.fsf@oldenburg2.str.redhat.com>
Date:   Thu, 06 Dec 2018 19:56:44 +0100
From:   Florian Weimer <fweimer@...hat.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Christian Brauner <christian@...uner.io>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "Serge E. Hallyn" <serge@...lyn.com>, Jann Horn <jannh@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Aleksa Sarai <cyphar@...har.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        Daniel Colascione <dancol@...gle.com>,
        Tim Murray <timmurray@...gle.com>,
        linux-man <linux-man@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH v2] signal: add procfd_signal() syscall

* Andy Lutomirski:

>> I suppose that's fine.  Or alternatively, when thread group support is
>> added, introduce a flag that applications have to use to enable it, so
>> that they can probe for support by checking support for the flag.
>>
>> I wouldn't be opposed to a new system call like this either:
>>
>>  int procfd_open (pid_t thread_group, pid_t thread_id, unsigned flags);
>>
>> But I think this is frowned upon on the kernel side.
>
> I have no problem with it, except that I think it shouldn’t return an
> fd that can be used for proc filesystem access.

Oh no, my intention was that it would just be used with  *_send_signal
and related functions.

Thanks,
Florian