linux-kernel - Re: [PATCH] Smack: Simplified Mandatory Access Control Kernel

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Date:	Sat, 11 Aug 2007 12:56:42 -0700 (PDT)
From:	Casey Schaufler <casey@...aufler-ca.com>
To:	Arjan van de Ven <arjan@...radead.org>, casey@...aufler-ca.com
Cc:	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, akpm@...l.org, torvalds@...l.org
Subject: Re: [PATCH] Smack: Simplified Mandatory Access Control Kernel


--- Arjan van de Ven <arjan@...radead.org> wrote:

> > +extern struct smk_list_entry *smack_list;
> 
> any reason to invent your own list rather than just using list.h?

The list.h mechanisms are fine, but heavier than I require.
I'm willing to give in on it, but I don't see an advantage.

> > +
> > +#include <linux/kernel.h>
> > +#include <linux/vmalloc.h>
> > +#include <linux/security.h>
> > +#include <linux/mutex.h>
> > +#include <net/netlabel.h>
> > +#include "../../net/netlabel/netlabel_domainhash.h"
> 
> can't you move this header to include/ instead?

Paul Moore, the developer of netlabel, promised to work out
the right solution for this with me at a future date. He
doesn't want to move the header, and I respect that.

> > +
> > +static struct file_operations smk_load_ops = {
> > +	.read		= smk_read_load,
> > +	.write		= smk_write_load,
> > +};
> 
> make that a const please

Will do.

> > +
> > +	doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
> > +	if (doip == NULL)
> > +		panic("smack:  Failed to initialize cipso DOI.\n");
> > +	doip->map.std = NULL;
> > +
> > +	ndmp = kmalloc(sizeof(struct netlbl_dom_map), GFP_KERNEL);
> > +	if (ndmp == NULL)
> > +		panic("smack:  Failed to initialize cipso ndmp.\n");
> 
> 
> is panic() really the right thing here? It's usually considered quite
> rude ;)

It's really early in start-up and if you're out of memory at that
point you are not going very far into the future.

> > +static struct file_operations smk_cipso_ops = {
> > +	.read		= smk_read_cipso,
> > +	.write		= smk_write_cipso,
> > +};
> 
> another candidate for const

Will do that, too.

> > +static void *smackfs_follow_link(struct dentry *dentry, struct nameidata
> *nd)
> > +{
> 
> 
> this one deserves a comment; are you implementing magic symlinks here?

Yup.

Casey Schaufler
casey@...aufler-ca.com
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