linux-kernel - Re: [PATCH v9 19/25] integrity: Move integrity_kernel_module

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Date: Mon, 12 Feb 2024 12:56:50 -0500
From: Paul Moore <paul@...l-moore.com>
To: Stefan Berger <stefanb@...ux.ibm.com>
Cc: Roberto Sassu <roberto.sassu@...weicloud.com>, viro@...iv.linux.org.uk, 
	brauner@...nel.org, chuck.lever@...cle.com, jlayton@...nel.org, neilb@...e.de, 
	kolga@...app.com, Dai.Ngo@...cle.com, tom@...pey.com, jmorris@...ei.org, 
	serge@...lyn.com, zohar@...ux.ibm.com, dmitry.kasatkin@...il.com, 
	eric.snowberg@...cle.com, dhowells@...hat.com, jarkko@...nel.org, 
	stephen.smalley.work@...il.com, eparis@...isplace.org, casey@...aufler-ca.com, 
	shuah@...nel.org, mic@...ikod.net, linux-kernel@...r.kernel.org, 
	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org, 
	linux-security-module@...r.kernel.org, linux-integrity@...r.kernel.org, 
	keyrings@...r.kernel.org, selinux@...r.kernel.org, 
	linux-kselftest@...r.kernel.org, Roberto Sassu <roberto.sassu@...wei.com>
Subject: Re: [PATCH v9 19/25] integrity: Move integrity_kernel_module_request()
 to IMA

On Mon, Feb 12, 2024 at 12:48 PM Stefan Berger <stefanb@...ux.ibm.com> wrote:
> On 1/15/24 13:18, Roberto Sassu wrote:

..

> > +/**
> > + * ima_kernel_module_request - Prevent crypto-pkcs1pad(rsa,*) requests
> > + * @kmod_name: kernel module name
> > + *
> > + * We have situation, when public_key_verify_signature() in case of RSA > + * algorithm use alg_name to store internal information in order to
> > + * construct an algorithm on the fly, but crypto_larval_lookup() will try
> > + * to use alg_name in order to load kernel module with same name.
> > + * Since we don't have any real "crypto-pkcs1pad(rsa,*)" kernel modules,
> > + * we are safe to fail such module request from crypto_larval_lookup().
> > + *
> > + * In this way we prevent modprobe execution during digsig verification
> > + * and avoid possible deadlock if modprobe and/or it's dependencies
> > + * also signed with digsig.
>
> This text needs to some reformulation at some point..

There is no time like the present.  If you have a suggestion I would
love to hear it and I'm sure Roberto would too.

-- 
paul-moore.com