linux-kernel - Re: [PATCH] kmod: make request_module() return an error when autoloading is disabled

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Message-ID: <202003111050.B5D4423DA@keescook>
Date:   Wed, 11 Mar 2020 10:50:48 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        stable@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jeff Vander Stoep <jeffv@...gle.com>,
        Jessica Yu <jeyu@...nel.org>,
        Luis Chamberlain <mcgrof@...nel.org>
Subject: Re: [PATCH] kmod: make request_module() return an error when
 autoloading is disabled

On Wed, Mar 11, 2020 at 10:41:34AM -0700, Eric Biggers wrote:
> On Wed, Mar 11, 2020 at 10:28:07AM -0700, Kees Cook wrote:
> > On Tue, Mar 10, 2020 at 03:37:31PM -0700, Eric Biggers wrote:
> > > From: Eric Biggers <ebiggers@...gle.com>
> > > 
> > > It's long been possible to disable kernel module autoloading completely
> > > by setting /proc/sys/kernel/modprobe to the empty string.  This can be
> > 
> > Hunh. I've never seen that before. :) I've always used;
> > 
> > echo 1 > /proc/sys/kernel/modules_disabled
> > 
> > Regardless,
> > 
> > Reviewed-by: Kees Cook <keescook@...omium.org>
> > 
> 
> modules_disabled is different because it disables *all* module loading, not just
> autoloading.

Yes, quite true. Some day I'd love to revisit this series to improve
autoloading sanity checking:
https://github.com/KSPP/linux/issues/24

-- 
Kees Cook