linux-kernel - Re: [PATCH] SMACK smacklabel : apply &MASK to IP inserted in /smack/netlabel

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Message-Id: <200902171854.17203.paul.moore@hp.com>
Date:	Tue, 17 Feb 2009 18:54:17 -0500
From:	Paul Moore <paul.moore@...com>
To:	etienne <etienne.basset@...ericable.fr>
Cc:	Casey Schaufler <casey@...aufler-ca.com>,
	"Linux-Kernel" <linux-kernel@...r.kernel.org>,
	linux-security-module@...r.kernel.org
Subject: Re: [PATCH] SMACK smacklabel : apply &MASK to IP inserted in /smack/netlabel

On Tuesday 17 February 2009 03:32:15 pm etienne wrote:
> ----
> diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
> index 8e42800..5717150 100644
> --- a/security/smack/smackfs.c
> +++ b/security/smack/smackfs.c
> @@ -765,6 +765,7 @@ static ssize_t smk_write_netlbladdr(struct file *file,
> const char __user *buf, mask.s_addr |= bebits;
>                 bebits <<= 1;
>         }
> +       newname.sin_addr.s_addr &= mask.s_addr;
>         /*
>          * Only allow one writer at a time. Writes should be
>          * quite rare and small in any case.

If you do this you can simplify some of the code in smack_host_label() by 
removing the code which applies the mask to the stored addresses when 
comparing addresses.  There may be other places as well.

-- 
paul moore
linux @ hp

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