linux-kernel - Re: seccomp feature development

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Message-ID: <CALCETrXv82qFRRXvH0ELQScRkKFzp+ND_8pahD+YJ=0OWY8YWg@mail.gmail.com>
Date:   Mon, 18 May 2020 15:55:06 -0700
From:   Andy Lutomirski <luto@...capital.net>
To:     Kees Cook <keescook@...omium.org>
Cc:     Christian Brauner <christian.brauner@...ntu.com>,
        Tycho Andersen <tycho@...ho.ws>,
        Sargun Dhillon <sargun@...gun.me>,
        Matt Denton <mpdenton@...gle.com>,
        Chris Palmer <palmer@...gle.com>,
        Jeffrey Vander Stoep <jeffv@...gle.com>,
        Linux Containers <containers@...ts.linux-foundation.org>,
        Linux API <linux-api@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: seccomp feature development

On Mon, May 18, 2020 at 2:05 PM Kees Cook <keescook@...omium.org> wrote:
>
> Hi!
>

This is minor, but, if we grow seccomp_data, I would like to add the
other 32 bits of the syscall nr to it.  Syscall numbers are unsigned
long, but they get munged into u32 for seccomp_data.

Sure, no one uses those high bits yet, but if we're extending things
anyway, let's support them.