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SELinux: Only store the network interface's ifindex

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Instead of storing the packet's network interface name store the ifindex.  This
allows us to defer the need to lookup the net_device structure until the audit
record is generated meaning that in the majority of cases we never need to
bother with this at all.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Paul Moore 2008-01-29 08:38:10 -05:00 committed by James Morris
parent e8bfdb9d0d
commit da5645a28a
3 changed files with 15 additions and 6 deletions
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15
security/selinux/avc.c
View file

@ -661,9 +661,18 @@ void avc_audit(u32 ssid, u32 tsid,
"daddr", "dest");
break;
}
if (a->u.net.netif)
audit_log_format(ab, " netif=%s",
a->u.net.netif);
if (a->u.net.netif > 0) {
struct net_device *dev;
/* NOTE: we always use init's namespace */
dev = dev_get_by_index(&init_net,
a->u.net.netif);
if (dev) {
audit_log_format(ab, " netif=%s",
dev->name);
dev_put(dev);
}
}
break;
}
}

4
security/selinux/hooks.c
View file

@ -3928,7 +3928,7 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
family = PF_INET;
AVC_AUDIT_DATA_INIT(&ad, NET);
ad.u.net.netif = skb->dev ? skb->dev->name : "[unknown]";
ad.u.net.netif = skb->iif;
ad.u.net.family = family;
err = selinux_parse_skb(skb, &ad, &addrp, &len, 1, NULL);
@ -4259,7 +4259,7 @@ static unsigned int selinux_ip_postroute_last(unsigned int hooknum,
sksec = sk->sk_security;
AVC_AUDIT_DATA_INIT(&ad, NET);
ad.u.net.netif = dev->name;
ad.u.net.netif = dev->ifindex;
ad.u.net.family = family;
err = selinux_parse_skb(skb, &ad, &addrp, &len, 0, &proto);

2
security/selinux/include/avc.h
View file

@ -51,7 +51,7 @@ struct avc_audit_data {
struct inode *inode;
} fs;
struct {
char *netif;
int netif;
struct sock *sk;
u16 family;
__be16 dport;