linux-kernel - Re: [RFC 04/11] ima: add support to namespace securityfs file

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Date:   Thu, 18 May 2017 15:39:39 -0600
From:   Tycho Andersen <tycho@...ker.com>
To:     Guilherme Magalhaes <guilherme.magalhaes@....com>
Cc:     dmitry.kasatkin@...il.com, zohar@...ux.vnet.ibm.com,
        viro@...iv.linux.org.uk, james.l.morris@...cle.com,
        serge@...lyn.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-ima-devel@...ts.sourceforge.net,
        linux-ima-user@...ts.sourceforge.net,
        linux-security-module@...r.kernel.org, joaquims@....com,
        nigel.edwards@....com
Subject: Re: [RFC 04/11] ima: add support to namespace securityfs file

Hi Guilherme,

On Thu, May 11, 2017 at 10:59:56AM -0300, Guilherme Magalhaes wrote:
> +static int ima_open_namespaces(struct inode *inode, struct file *filp)
> +{
> +	if (!(filp->f_flags & O_WRONLY))
> +		return -EACCES;
> +
> +	if (!capable(CAP_SYS_ADMIN))
> +		return -EPERM;
> +
> +	if (test_and_set_bit(IMA_FS_BUSY, &ima_fs_flags))
> +		return -EBUSY;

It probably makes sense to do something like:

if (!(ima_appraise & IMA_APPRAISE_NAMESPACE))
	return -EINVAL;

here.

I'll keep playing around with this patchset and see if I have any
other feedback.

Cheers,

Tycho