netlink: kill loginuid/sessionid/sid members from struct netlink_skb_parms
Patrick McHardy [Thu, 3 Mar 2011 18:55:40 +0000 (10:55 -0800)]
Netlink message processing in the kernel is synchronous these days, the
session information can be collected when needed.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/netlink.h
kernel/audit.c
kernel/auditfilter.c
net/netlabel/netlabel_user.h
net/netlink/af_netlink.c
net/xfrm/xfrm_user.c
security/selinux/hooks.c

index e2b9e63..66823b8 100644 (file)
@@ -161,9 +161,6 @@ struct netlink_skb_parms {
        __u32                   pid;
        __u32                   dst_group;
        kernel_cap_t            eff_cap;
-       __u32                   loginuid;       /* Login (audit) uid */
-       __u32                   sessionid;      /* Session id (audit) */
-       __u32                   sid;            /* SELinux security id */
 };
 
 #define NETLINK_CB(skb)                (*(struct netlink_skb_parms*)&((skb)->cb))
index 162e88e..9395003 100644 (file)
@@ -673,9 +673,9 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 
        pid  = NETLINK_CREDS(skb)->pid;
        uid  = NETLINK_CREDS(skb)->uid;
-       loginuid = NETLINK_CB(skb).loginuid;
-       sessionid = NETLINK_CB(skb).sessionid;
-       sid  = NETLINK_CB(skb).sid;
+       loginuid = audit_get_loginuid(current);
+       sessionid = audit_get_sessionid(current);
+       security_task_getsecid(current, &sid);
        seq  = nlh->nlmsg_seq;
        data = NLMSG_DATA(nlh);
 
index add2819..f8277c8 100644 (file)
@@ -1238,6 +1238,7 @@ static int audit_filter_user_rules(struct netlink_skb_parms *cb,
        for (i = 0; i < rule->field_count; i++) {
                struct audit_field *f = &rule->fields[i];
                int result = 0;
+               u32 sid;
 
                switch (f->type) {
                case AUDIT_PID:
@@ -1250,19 +1251,22 @@ static int audit_filter_user_rules(struct netlink_skb_parms *cb,
                        result = audit_comparator(cb->creds.gid, f->op, f->val);
                        break;
                case AUDIT_LOGINUID:
-                       result = audit_comparator(cb->loginuid, f->op, f->val);
+                       result = audit_comparator(audit_get_loginuid(current),
+                                                 f->op, f->val);
                        break;
                case AUDIT_SUBJ_USER:
                case AUDIT_SUBJ_ROLE:
                case AUDIT_SUBJ_TYPE:
                case AUDIT_SUBJ_SEN:
                case AUDIT_SUBJ_CLR:
-                       if (f->lsm_rule)
-                               result = security_audit_rule_match(cb->sid,
+                       if (f->lsm_rule) {
+                               security_task_getsecid(current, &sid);
+                               result = security_audit_rule_match(sid,
                                                                   f->type,
                                                                   f->op,
                                                                   f->lsm_rule,
                                                                   NULL);
+                       }
                        break;
                }
 
index 6caef8b..f4fc4c9 100644 (file)
@@ -49,9 +49,9 @@
 static inline void netlbl_netlink_auditinfo(struct sk_buff *skb,
                                            struct netlbl_audit *audit_info)
 {
-       audit_info->secid = NETLINK_CB(skb).sid;
-       audit_info->loginuid = NETLINK_CB(skb).loginuid;
-       audit_info->sessionid = NETLINK_CB(skb).sessionid;
+       security_task_getsecid(current, &audit_info->secid);
+       audit_info->loginuid = audit_get_loginuid(current);
+       audit_info->sessionid = audit_get_sessionid(current);
 }
 
 /* NetLabel NETLINK I/O functions */
index 478181d..97ecd92 100644 (file)
@@ -1362,9 +1362,6 @@ static int netlink_sendmsg(struct kiocb *kiocb, struct socket *sock,
 
        NETLINK_CB(skb).pid     = nlk->pid;
        NETLINK_CB(skb).dst_group = dst_group;
-       NETLINK_CB(skb).loginuid = audit_get_loginuid(current);
-       NETLINK_CB(skb).sessionid = audit_get_sessionid(current);
-       security_task_getsecid(current, &(NETLINK_CB(skb).sid));
        memcpy(NETLINK_CREDS(skb), &siocb->scm->creds, sizeof(struct ucred));
 
        /* What can I do? Netlink is asynchronous, so that
index 673698d..468ab60 100644 (file)
@@ -497,9 +497,9 @@ static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
        struct xfrm_state *x;
        int err;
        struct km_event c;
-       uid_t loginuid = NETLINK_CB(skb).loginuid;
-       u32 sessionid = NETLINK_CB(skb).sessionid;
-       u32 sid = NETLINK_CB(skb).sid;
+       uid_t loginuid = audit_get_loginuid(current);
+       u32 sessionid = audit_get_sessionid(current);
+       u32 sid;
 
        err = verify_newsa_info(p, attrs);
        if (err)
@@ -515,6 +515,7 @@ static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
        else
                err = xfrm_state_update(x);
 
+       security_task_getsecid(current, &sid);
        xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
 
        if (err < 0) {
@@ -575,9 +576,9 @@ static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
        int err = -ESRCH;
        struct km_event c;
        struct xfrm_usersa_id *p = nlmsg_data(nlh);
-       uid_t loginuid = NETLINK_CB(skb).loginuid;
-       u32 sessionid = NETLINK_CB(skb).sessionid;
-       u32 sid = NETLINK_CB(skb).sid;
+       uid_t loginuid = audit_get_loginuid(current);
+       u32 sessionid = audit_get_sessionid(current);
+       u32 sid;
 
        x = xfrm_user_state_lookup(net, p, attrs, &err);
        if (x == NULL)
@@ -602,6 +603,7 @@ static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
        km_state_notify(x, &c);
 
 out:
+       security_task_getsecid(current, &sid);
        xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
        xfrm_state_put(x);
        return err;
@@ -1265,9 +1267,9 @@ static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
        struct km_event c;
        int err;
        int excl;
-       uid_t loginuid = NETLINK_CB(skb).loginuid;
-       u32 sessionid = NETLINK_CB(skb).sessionid;
-       u32 sid = NETLINK_CB(skb).sid;
+       uid_t loginuid = audit_get_loginuid(current);
+       u32 sessionid = audit_get_sessionid(current);
+       u32 sid;
 
        err = verify_newpolicy_info(p);
        if (err)
@@ -1286,6 +1288,7 @@ static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
         * a type XFRM_MSG_UPDPOLICY - JHS */
        excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
        err = xfrm_policy_insert(p->dir, xp, excl);
+       security_task_getsecid(current, &sid);
        xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
 
        if (err) {
@@ -1522,10 +1525,11 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
                                            NETLINK_CB(skb).pid);
                }
        } else {
-               uid_t loginuid = NETLINK_CB(skb).loginuid;
-               u32 sessionid = NETLINK_CB(skb).sessionid;
-               u32 sid = NETLINK_CB(skb).sid;
+               uid_t loginuid = audit_get_loginuid(current);
+               u32 sessionid = audit_get_sessionid(current);
+               u32 sid;
 
+               security_task_getsecid(current, &sid);
                xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
                                         sid);
 
@@ -1553,9 +1557,9 @@ static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
        struct xfrm_audit audit_info;
        int err;
 
-       audit_info.loginuid = NETLINK_CB(skb).loginuid;
-       audit_info.sessionid = NETLINK_CB(skb).sessionid;
-       audit_info.secid = NETLINK_CB(skb).sid;
+       audit_info.loginuid = audit_get_loginuid(current);
+       audit_info.sessionid = audit_get_sessionid(current);
+       security_task_getsecid(current, &audit_info.secid);
        err = xfrm_state_flush(net, p->proto, &audit_info);
        if (err) {
                if (err == -ESRCH) /* empty table */
@@ -1720,9 +1724,9 @@ static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
        if (err)
                return err;
 
-       audit_info.loginuid = NETLINK_CB(skb).loginuid;
-       audit_info.sessionid = NETLINK_CB(skb).sessionid;
-       audit_info.secid = NETLINK_CB(skb).sid;
+       audit_info.loginuid = audit_get_loginuid(current);
+       audit_info.sessionid = audit_get_sessionid(current);
+       security_task_getsecid(current, &audit_info.secid);
        err = xfrm_policy_flush(net, type, &audit_info);
        if (err) {
                if (err == -ESRCH) /* empty table */
@@ -1789,9 +1793,11 @@ static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
 
        err = 0;
        if (up->hard) {
-               uid_t loginuid = NETLINK_CB(skb).loginuid;
-               uid_t sessionid = NETLINK_CB(skb).sessionid;
-               u32 sid = NETLINK_CB(skb).sid;
+               uid_t loginuid = audit_get_loginuid(current);
+               u32 sessionid = audit_get_sessionid(current);
+               u32 sid;
+
+               security_task_getsecid(current, &sid);
                xfrm_policy_delete(xp, p->dir);
                xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
 
@@ -1830,9 +1836,11 @@ static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
        km_state_expired(x, ue->hard, current->pid);
 
        if (ue->hard) {
-               uid_t loginuid = NETLINK_CB(skb).loginuid;
-               uid_t sessionid = NETLINK_CB(skb).sessionid;
-               u32 sid = NETLINK_CB(skb).sid;
+               uid_t loginuid = audit_get_loginuid(current);
+               u32 sessionid = audit_get_sessionid(current);
+               u32 sid;
+
+               security_task_getsecid(current, &sid);
                __xfrm_state_delete(x);
                xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
        }
index c8d6992..cef42f5 100644 (file)
@@ -4669,6 +4669,7 @@ static int selinux_netlink_recv(struct sk_buff *skb, int capability)
 {
        int err;
        struct common_audit_data ad;
+       u32 sid;
 
        err = cap_netlink_recv(skb, capability);
        if (err)
@@ -4677,8 +4678,9 @@ static int selinux_netlink_recv(struct sk_buff *skb, int capability)
        COMMON_AUDIT_DATA_INIT(&ad, CAP);
        ad.u.cap = capability;
 
-       return avc_has_perm(NETLINK_CB(skb).sid, NETLINK_CB(skb).sid,
-                           SECCLASS_CAPABILITY, CAP_TO_MASK(capability), &ad);
+       security_task_getsecid(current, &sid);
+       return avc_has_perm(sid, sid, SECCLASS_CAPABILITY,
+                           CAP_TO_MASK(capability), &ad);
 }
 
 static int ipc_alloc_security(struct task_struct *task,