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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <alpine.LRH.2.20.1704192114270.12914@namei.org>
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>