linux-kernel - Any chance that kernel/uid6.c can go? [Was: [PATCH 22/45] kernel: provide ksys_*() wrappers for syscalls called by kernel/uid16.c]

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Date:   Thu, 22 Mar 2018 11:21:40 +0100
From:   Dominik Brodowski <linux@...inikbrodowski.net>
To:     linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        viro@...IV.linux.org.uk, arnd@...db.de, linux-arch@...r.kernel.org
Cc:     "Eric W . Biederman" <ebiederm@...ssion.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Any chance that kernel/uid6.c can go? [Was: [PATCH 22/45] kernel:
 provide ksys_*() wrappers for syscalls called by kernel/uid16.c]

On Thu, Mar 22, 2018 at 10:00:36AM +0100, Dominik Brodowski wrote:
> Using these helpers allows us to avoid the in-kernel calls to these
> syscalls: sys_setregid(), sys_setgid(), sys_setreuid(), sys_setuid(),
> sys_setresuid(), sys_setresgid(), sys_setfsuid(), and sys_setfsgid().
> 
> The ksys_ prefix denotes that these function are meant as a drop-in
> replacement for the syscall. In particular, they use the same calling
> convention.
> 
> This patch is part of a series which tries to remove in-kernel calls to
> syscalls. On this basis, the syscall entry path can be streamlined.
> 
> Cc: Al Viro <viro@...IV.linux.org.uk>
> Cc: Eric W. Biederman <ebiederm@...ssion.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Dominik Brodowski <linux@...inikbrodowski.net>
> ---
>  kernel/sys.c   | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++--------
>  kernel/uid16.c | 19 ++++++++++---------

In its header, kernel/uid16.c says, since 2.3.39 was released in January
2000:

 *      Wrapper functions for 16bit uid back compatibility. All nicely tied
 *      together in the faint hope we can take the out in five years time.

Are we any closer to removing these wrappers?

Thanks,
	Dominik