linux-kernel - Re: [RFC PATCH 01/35] syscalls: define goal to not call sys

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Message-ID: <CALCETrV3gUrL3fpr5EEjMyoWtj5t64hpYxjO+qJfUVTq7z1rNQ@mail.gmail.com>
Date:   Sun, 11 Mar 2018 15:24:01 +0000
From:   Andy Lutomirski <luto@...nel.org>
To:     Dominik Brodowski <linux@...inikbrodowski.net>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Andrew Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH 01/35] syscalls: define goal to not call sys_xyzzy()
 from within the kernel

On Sun, Mar 11, 2018 at 10:55 AM, Dominik Brodowski
<linux@...inikbrodowski.net> wrote:
> The syscall entry points to the kernel defined by SYSCALL_DEFINEx()
> and COMPAT_SYSCALL_DEFINEx() should only be called from userspace
> through kernel entry points, but not from the kernel itself. This
> will allow cleanups and optimizations to the entry paths *and* to
> the parts of the kernel code which currently need to pretend to be
> userspace in order to make use of syscalls.
>

> +
> +/*
> + * The kernel should not use call syscalls (i.e., sys_xyzyyz()) directly.
> + * Instead, use one of the following functions which work equivalent to
> + * the syscall they are named for.

"Instead, use one of the functions which work equivalently, e.g. do_xysyyz()"