linux-kernel - Re: [RFC v2] ptrace, pidfd: add pidfd

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Date:   Mon, 27 Apr 2020 11:00:05 +0200 (CEST)
From:   Hagen Paul Pfeifer <hagen@...u.net>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Florian Weimer <fweimer@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <christian@...uner.io>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, Brian Gerst <brgerst@...il.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        David Howells <dhowells@...hat.com>,
        Aleksa Sarai <cyphar@...har.com>,
        Andy Lutomirski <luto@...nel.org>,
        Oleg Nesterov <oleg@...hat.com>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Sargun Dhillon <sargun@...gun.me>,
        Linux API <linux-api@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [RFC v2] ptrace, pidfd: add pidfd_ptrace syscall

> On April 27, 2020 10:30 AM Arnd Bergmann <arnd@...db.de> wrote:

Hey Arnd

> When you add a new system call, please add it to all architectures.
> See the patches for the last few additions on how to do it, in
> particular the bit around adding the arm64 compat entry that is
> a bit tricky.

Yes, the patch was intended to be as an rough (but x86_64 working)
RFC patch to basically check if there is interest in it. Or whether
there are fundamental reasons against pidfd_ptrace().

If not I will prepare v3 with all input, sure! Thank you Arnd

Hagen