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authorEric Paris <eparis@redhat.com>2012-04-02 13:15:44 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-04-03 09:49:10 -0700
commit48c62af68a403ef1655546bd3e021070c8508573 (patch)
treeba938e4fb45d5bdaad2dad44071d0625f8e36945 /security/smack
parent3b3b0e4fc15efa507b902d90cea39e496a523c3b (diff)
downloadvexpress-lsk-48c62af68a403ef1655546bd3e021070c8508573.tar.gz
LSM: shrink the common_audit_data data union
After shrinking the common_audit_data stack usage for private LSM data I'm not going to shrink the data union. To do this I'm going to move anything larger than 2 void * ptrs to it's own structure and require it to be declared separately on the calling stack. Thus hot paths which don't need more than a couple pointer don't have to declare space to hold large unneeded structures. I could get this down to one void * by dealing with the key struct and the struct path. We'll see if that is helpful after taking care of networking. Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'security/smack')
-rw-r--r--security/smack/smack.h10
-rw-r--r--security/smack/smack_lsm.c29
2 files changed, 26 insertions, 13 deletions
diff --git a/security/smack/smack.h b/security/smack/smack.h
index ccba3823d9e..4ede719922e 100644
--- a/security/smack/smack.h
+++ b/security/smack/smack.h
@@ -325,6 +325,14 @@ static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
a->a.smack_audit_data->function = func;
}
+static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func,
+ char type, struct lsm_network_audit *net)
+{
+ smk_ad_init(a, func, type);
+ memset(net, 0, sizeof(*net));
+ a->a.u.net = net;
+}
+
static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
struct task_struct *t)
{
@@ -348,7 +356,7 @@ static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
struct sock *sk)
{
- a->a.u.net.sk = sk;
+ a->a.u.net->sk = sk;
}
#else /* no AUDIT */
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index cd667b4089a..81c03a59711 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -1939,16 +1939,17 @@ static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
char *hostsp;
struct socket_smack *ssp = sk->sk_security;
struct smk_audit_info ad;
+ struct lsm_network_audit net;
rcu_read_lock();
hostsp = smack_host_label(sap);
if (hostsp != NULL) {
sk_lbl = SMACK_UNLABELED_SOCKET;
#ifdef CONFIG_AUDIT
- smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
- ad.a.u.net.family = sap->sin_family;
- ad.a.u.net.dport = sap->sin_port;
- ad.a.u.net.v4info.daddr = sap->sin_addr.s_addr;
+ smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
+ ad.a.u.net->family = sap->sin_family;
+ ad.a.u.net->dport = sap->sin_port;
+ ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
#endif
rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad);
} else {
@@ -2808,9 +2809,10 @@ static int smack_unix_stream_connect(struct sock *sock,
struct socket_smack *osp = other->sk_security;
struct socket_smack *nsp = newsk->sk_security;
struct smk_audit_info ad;
+ struct lsm_network_audit net;
int rc = 0;
- smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
+ smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
smk_ad_setfield_u_net_sk(&ad, other);
if (!capable(CAP_MAC_OVERRIDE))
@@ -2840,9 +2842,10 @@ static int smack_unix_may_send(struct socket *sock, struct socket *other)
struct socket_smack *ssp = sock->sk->sk_security;
struct socket_smack *osp = other->sk->sk_security;
struct smk_audit_info ad;
+ struct lsm_network_audit net;
int rc = 0;
- smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
+ smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
smk_ad_setfield_u_net_sk(&ad, other->sk);
if (!capable(CAP_MAC_OVERRIDE))
@@ -2990,6 +2993,7 @@ static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
char *csp;
int rc;
struct smk_audit_info ad;
+ struct lsm_network_audit net;
if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
return 0;
@@ -3007,9 +3011,9 @@ static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
netlbl_secattr_destroy(&secattr);
#ifdef CONFIG_AUDIT
- smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
- ad.a.u.net.family = sk->sk_family;
- ad.a.u.net.netif = skb->skb_iif;
+ smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
+ ad.a.u.net->family = sk->sk_family;
+ ad.a.u.net->netif = skb->skb_iif;
ipv4_skb_to_auditdata(skb, &ad.a, NULL);
#endif
/*
@@ -3152,6 +3156,7 @@ static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
char *sp;
int rc;
struct smk_audit_info ad;
+ struct lsm_network_audit net;
/* handle mapped IPv4 packets arriving via IPv6 sockets */
if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
@@ -3166,9 +3171,9 @@ static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
netlbl_secattr_destroy(&secattr);
#ifdef CONFIG_AUDIT
- smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
- ad.a.u.net.family = family;
- ad.a.u.net.netif = skb->skb_iif;
+ smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
+ ad.a.u.net->family = family;
+ ad.a.u.net->netif = skb->skb_iif;
ipv4_skb_to_auditdata(skb, &ad.a, NULL);
#endif
/*