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

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Date:	Tue, 17 Feb 2009 21:32:15 +0100
From:	etienne <etienne.basset@...ericable.fr>
To:	Casey Schaufler <casey@...aufler-ca.com>
CC:	Linux-Kernel <linux-kernel@...r.kernel.org>,
	linux-security-module@...r.kernel.org
Subject: [PATCH] SMACK smacklabel : apply &MASK to IP inserted in /smack/netlabel

hello,

with current code it is possible to insert inconsistent IP/mask in /smack/netlabel

before patch :
==============

root@...enne-desktop:/home/etienne/linux-2.6# cat /smack/netlabel
12.67.3.2/15 @
12.67.3.1/15 @
12.67.2.1/15 @
12.67.2.1/16 @
12.67.1.1/16 @
0.0.0.0/0 @

the solution is to apply the mask to the IP inserted in /smack/netlabel

after the patch:
================
root@...enne-desktop:/home/etienne/linux-2.6# echo 12.67.3.2/15 @ > /smack/netlabel           
root@...enne-desktop:/home/etienne/linux-2.6# cat /smack/netlabel                             
12.67.0.0/15 @                                                                                
root@...enne-desktop:/home/etienne/linux-2.6# echo 12.67.3.1/15 @ > /smack/netlabel                             
root@...enne-desktop:/home/etienne/linux-2.6# cat /smack/netlabel                             
12.67.0.0/15 @                                                                                
root@...enne-desktop:/home/etienne/linux-2.6# echo 12.67.3.3/15 @ > /smack/netlabel                             
root@...enne-desktop:/home/etienne/linux-2.6# cat /smack/netlabel                             
12.67.0.0/15 @                                                  

regards,
Etienne

Signed-off-by: <etienen.basset@...ericable.fr>
----
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.


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