linux-kernel - Re: [PATCH] make TIOCSTI ioctl require CAP_SYS

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Date:   Wed, 19 Apr 2017 21:18:13 +1000 (AEST)
From:   James Morris <jmorris@...ei.org>
To:     Matt Brown <matt@...tt.com>
cc:     serge@...lyn.com, gregkh@...uxfoundation.org, jslaby@...e.com,
        akpm@...ux-foundation.org, jannh@...gle.com, keescook@...omium.org,
        kernel-hardening@...ts.openwall.com,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] make TIOCSTI ioctl require CAP_SYS_ADMIN

On Tue, 18 Apr 2017, Matt Brown wrote:

> This patch reproduces GRKERNSEC_HARDEN_TTY functionality from the grsecurity
> project in-kernel.

It seems like an ugly hack to an ugly feature (CAP_SYS_ADMIN barely makes 
sense here), and rather than sprinkling these types of things throughout 
the kernel, I wonder if it might be better to implement it via LSM, in the 
YAMA module.

- James
-- 
James Morris
<jmorris@...ei.org>