linux-kernel - Re: [PATCH] tty: ldisc: add sysctl to prevent autoloading of ldiscs

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Message-ID: <20190122000142.GB19379@mit.edu>
Date:   Mon, 21 Jan 2019 19:01:42 -0500
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     <kernel-hardening@...ts.openwall.com>,
        <linux-kernel@...r.kernel.org>, <linux-serial@...r.kernel.org>,
        Jiri Slaby <jslaby@...e.com>
Subject: Re: [PATCH] tty: ldisc: add sysctl to prevent autoloading of ldiscs

On Mon, Jan 21, 2019 at 05:26:42PM +0100, Greg Kroah-Hartman wrote:
> By default, the kernel will automatically load the module of any line
> dicipline that is asked for.  As this sometimes isn't the safest thing
> to do, provide a sysctl to disable this feature.
> 
> By default, we set this to 'y' as that is the historical way that Linux
> has worked, and we do not want to break working systems.  But in the
> future, perhaps this can default to 'n' to prevent this functionality.
> 
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Reviewed-by: Theodore Ts'o <tytso@....edu>