xfrm: Remove useless secid field from xfrm_audit.

It seems to me that commit ab5f5e8b "[XFRM]: xfrm audit calls" is doing
something strange at xfrm_audit_helper_usrinfo().
If secid != 0 && security_secid_to_secctx(secid) != 0, the caller calls
audit_log_task_context() which basically does
secid != 0 && security_secid_to_secctx(secid) == 0 case
except that secid is obtained from current thread's context.

Oh, what happens if secid passed to xfrm_audit_helper_usrinfo() was
obtained from other thread's context? It might audit current thread's
context rather than other thread's context if security_secid_to_secctx()
in xfrm_audit_helper_usrinfo() failed for some reason.

Then, are all the caller of xfrm_audit_helper_usrinfo() passing either
secid obtained from current thread's context or secid == 0?
It seems to me that they are.

If I didn't miss something, we don't need to pass secid to
xfrm_audit_helper_usrinfo() because audit_log_task_context() will
obtain secid from current thread's context.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

5 files changed, 36 insertions, 71 deletions

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 116e9c7e19cb..882889eb156b 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -693,7 +693,6 @@ struct xfrm_spi_skb_cb {
 
 /* Audit Information */
 struct xfrm_audit {
-        u32     secid;
         kuid_t  loginuid;
         unsigned int sessionid;
 };
@@ -713,30 +712,22 @@ static inline struct audit_buffer *xfrm_audit_start(const char *op)
         return audit_buf;
 }
 
-static inline void xfrm_audit_helper_usrinfo(kuid_t auid, unsigned int ses, u32 secid,
+static inline void xfrm_audit_helper_usrinfo(kuid_t auid, unsigned int ses,
                                              struct audit_buffer *audit_buf)
 {
-        char *secctx;
-        u32 secctx_len;
-
         audit_log_format(audit_buf, " auid=%u ses=%u",
                          from_kuid(&init_user_ns, auid), ses);
-        if (secid != 0 &&
-            security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
-                audit_log_format(audit_buf, " subj=%s", secctx);
-                security_release_secctx(secctx, secctx_len);
-        } else
-                audit_log_task_context(audit_buf);
+        audit_log_task_context(audit_buf);
 }
 
 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, kuid_t auid,
-                           unsigned int ses, u32 secid);
+                           unsigned int ses);
 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, kuid_t auid,
-                              unsigned int ses, u32 secid);
+                              unsigned int ses);
 void xfrm_audit_state_add(struct xfrm_state *x, int result, kuid_t auid,
-                          unsigned int ses, u32 secid);
+                          unsigned int ses);
 void xfrm_audit_state_delete(struct xfrm_state *x, int result, kuid_t auid,
-                             unsigned int ses, u32 secid);
+                             unsigned int ses);
 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
                                       struct sk_buff *skb);
 void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
@@ -749,22 +740,22 @@ void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
 #else
 
 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
-                                  kuid_t auid, unsigned int ses, u32 secid)
+                                  kuid_t auid, unsigned int ses)
 {
 }
 
 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
-                                  kuid_t auid, unsigned int ses, u32 secid)
+                                  kuid_t auid, unsigned int ses)
 {
 }
 
 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
-                                 kuid_t auid, unsigned int ses, u32 secid)
+                                 kuid_t auid, unsigned int ses)
 {
 }
 
 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
-                                    kuid_t auid, unsigned int ses, u32 secid)
+                                    kuid_t auid, unsigned int ses)
 {
 }
 
diff --git a/net/key/af_key.c b/net/key/af_key.c
index f3c83073afc4..d66ff72adefb 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -1478,7 +1478,7 @@ static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg
 
         xfrm_audit_state_add(x, err ? 0 : 1,
                              audit_get_loginuid(current),
-                             audit_get_sessionid(current), 0);
+                             audit_get_sessionid(current));
 
         if (err < 0) {
                 x->km.state = XFRM_STATE_DEAD;
@@ -1534,7 +1534,7 @@ static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_
 out:
         xfrm_audit_state_delete(x, err ? 0 : 1,
                                 audit_get_loginuid(current),
-                                audit_get_sessionid(current), 0);
+                                audit_get_sessionid(current));
         xfrm_state_put(x);
 
         return err;
@@ -1735,7 +1735,6 @@ static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_m
 
         audit_info.loginuid = audit_get_loginuid(current);
         audit_info.sessionid = audit_get_sessionid(current);
-        audit_info.secid = 0;
         err = xfrm_state_flush(net, proto, &audit_info);
         err2 = unicast_flush_resp(sk, hdr);
         if (err || err2) {
@@ -2290,7 +2289,7 @@ static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_
 
         xfrm_audit_policy_add(xp, err ? 0 : 1,
                               audit_get_loginuid(current),
-                              audit_get_sessionid(current), 0);
+                              audit_get_sessionid(current));
 
         if (err)
                 goto out;
@@ -2374,7 +2373,7 @@ static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sa
 
         xfrm_audit_policy_delete(xp, err ? 0 : 1,
                                  audit_get_loginuid(current),
-                                 audit_get_sessionid(current), 0);
+                                 audit_get_sessionid(current));
 
         if (err)
                 goto out;
@@ -2624,7 +2623,7 @@ static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_
         if (delete) {
                 xfrm_audit_policy_delete(xp, err ? 0 : 1,
                                 audit_get_loginuid(current),
-                                audit_get_sessionid(current), 0);
+                                audit_get_sessionid(current));
 
                 if (err)
                         goto out;
@@ -2738,7 +2737,6 @@ static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sad
 
         audit_info.loginuid = audit_get_loginuid(current);
         audit_info.sessionid = audit_get_sessionid(current);
-        audit_info.secid = 0;
         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
         err2 = unicast_flush_resp(sk, hdr);
         if (err || err2) {
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index c08fbd11ceff..bd001b7062c0 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -785,8 +785,7 @@ xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audi
                         if (err) {
                                 xfrm_audit_policy_delete(pol, 0,
                                                          audit_info->loginuid,
-                                                         audit_info->sessionid,
-                                                         audit_info->secid);
+                                                         audit_info->sessionid);
                                 return err;
                         }
                 }
@@ -801,8 +800,7 @@ xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audi
                                 if (err) {
                                         xfrm_audit_policy_delete(pol, 0,
                                                         audit_info->loginuid,
-                                                        audit_info->sessionid,
-                                                        audit_info->secid);
+                                                        audit_info->sessionid);
                                         return err;
                                 }
                         }
@@ -842,8 +840,7 @@ int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info)
                         cnt++;
 
                         xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,
-                                                 audit_info->sessionid,
-                                                 audit_info->secid);
+                                                 audit_info->sessionid);
 
                         xfrm_policy_kill(pol);
 
@@ -864,8 +861,7 @@ int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info)
 
                                 xfrm_audit_policy_delete(pol, 1,
                                                          audit_info->loginuid,
-                                                         audit_info->sessionid,
-                                                         audit_info->secid);
+                                                         audit_info->sessionid);
                                 xfrm_policy_kill(pol);
 
                                 write_lock_bh(&net->xfrm.xfrm_policy_lock);
@@ -2870,12 +2866,10 @@ static void xfrm_policy_fini(struct net *net)
 #ifdef CONFIG_XFRM_SUB_POLICY
         audit_info.loginuid = INVALID_UID;
         audit_info.sessionid = (unsigned int)-1;
-        audit_info.secid = 0;
         xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info);
 #endif
         audit_info.loginuid = INVALID_UID;
         audit_info.sessionid = (unsigned int)-1;
-        audit_info.secid = 0;
         xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
 
         WARN_ON(!list_empty(&net->xfrm.policy_all));
@@ -2992,14 +2986,14 @@ static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
 }
 
 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
-                           kuid_t auid, unsigned int sessionid, u32 secid)
+                           kuid_t auid, unsigned int sessionid)
 {
         struct audit_buffer *audit_buf;
 
         audit_buf = xfrm_audit_start("SPD-add");
         if (audit_buf == NULL)
                 return;
-        xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
+        xfrm_audit_helper_usrinfo(auid, sessionid, audit_buf);
         audit_log_format(audit_buf, " res=%u", result);
         xfrm_audit_common_policyinfo(xp, audit_buf);
         audit_log_end(audit_buf);
@@ -3007,14 +3001,14 @@ void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
 EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
 
 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
-                              kuid_t auid, unsigned int sessionid, u32 secid)
+                              kuid_t auid, unsigned int sessionid)
 {
         struct audit_buffer *audit_buf;
 
         audit_buf = xfrm_audit_start("SPD-delete");
         if (audit_buf == NULL)
                 return;
-        xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
+        xfrm_audit_helper_usrinfo(auid, sessionid, audit_buf);
         audit_log_format(audit_buf, " res=%u", result);
         xfrm_audit_common_policyinfo(xp, audit_buf);
         audit_log_end(audit_buf);
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 8e9c781a6bba..d91312b5ceb0 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -465,7 +465,7 @@ expired:
 
         xfrm_audit_state_delete(x, err ? 0 : 1,
                                 audit_get_loginuid(current),
-                                audit_get_sessionid(current), 0);
+                                audit_get_sessionid(current));
 
 out:
         spin_unlock(&x->lock);
@@ -574,8 +574,7 @@ xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audi
                            (err = security_xfrm_state_delete(x)) != 0) {
                                 xfrm_audit_state_delete(x, 0,
                                                         audit_info->loginuid,
-                                                        audit_info->sessionid,
-                                                        audit_info->secid);
+                                                        audit_info->sessionid);
                                 return err;
                         }
                 }
@@ -613,8 +612,7 @@ restart:
                                 err = xfrm_state_delete(x);
                                 xfrm_audit_state_delete(x, err ? 0 : 1,
                                                         audit_info->loginuid,
-                                                        audit_info->sessionid,
-                                                        audit_info->secid);
+                                                        audit_info->sessionid);
                                 xfrm_state_put(x);
                                 if (!err)
                                         cnt++;
@@ -2134,7 +2132,6 @@ void xfrm_state_fini(struct net *net)
         flush_work(&net->xfrm.state_hash_work);
         audit_info.loginuid = INVALID_UID;
         audit_info.sessionid = (unsigned int)-1;
-        audit_info.secid = 0;
         xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info);
         flush_work(&net->xfrm.state_gc_work);
 
@@ -2199,14 +2196,14 @@ static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
 }
 
 void xfrm_audit_state_add(struct xfrm_state *x, int result,
-                          kuid_t auid, unsigned int sessionid, u32 secid)
+                          kuid_t auid, unsigned int sessionid)
 {
         struct audit_buffer *audit_buf;
 
         audit_buf = xfrm_audit_start("SAD-add");
         if (audit_buf == NULL)
                 return;
-        xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
+        xfrm_audit_helper_usrinfo(auid, sessionid, audit_buf);
         xfrm_audit_helper_sainfo(x, audit_buf);
         audit_log_format(audit_buf, " res=%u", result);
         audit_log_end(audit_buf);
@@ -2214,14 +2211,14 @@ void xfrm_audit_state_add(struct xfrm_state *x, int result,
 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
 
 void xfrm_audit_state_delete(struct xfrm_state *x, int result,
-                             kuid_t auid, unsigned int sessionid, u32 secid)
+                             kuid_t auid, unsigned int sessionid)
 {
         struct audit_buffer *audit_buf;
 
         audit_buf = xfrm_audit_start("SAD-delete");
         if (audit_buf == NULL)
                 return;
-        xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
+        xfrm_audit_helper_usrinfo(auid, sessionid, audit_buf);
         xfrm_audit_helper_sainfo(x, audit_buf);
         audit_log_format(audit_buf, " res=%u", result);
         audit_log_end(audit_buf);
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 8f131c10a6f3..d6409d927b82 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -599,7 +599,6 @@ static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
         struct km_event c;
         kuid_t loginuid = audit_get_loginuid(current);
         unsigned int sessionid = audit_get_sessionid(current);
-        u32 sid;
 
         err = verify_newsa_info(p, attrs);
         if (err)
@@ -615,8 +614,7 @@ 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);
+        xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid);
 
         if (err < 0) {
                 x->km.state = XFRM_STATE_DEAD;
@@ -678,7 +676,6 @@ static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
         struct xfrm_usersa_id *p = nlmsg_data(nlh);
         kuid_t loginuid = audit_get_loginuid(current);
         unsigned int sessionid = audit_get_sessionid(current);
-        u32 sid;
 
         x = xfrm_user_state_lookup(net, p, attrs, &err);
         if (x == NULL)
@@ -703,8 +700,7 @@ 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_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid);
         xfrm_state_put(x);
         return err;
 }
@@ -1416,7 +1412,6 @@ static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
         int excl;
         kuid_t loginuid = audit_get_loginuid(current);
         unsigned int sessionid = audit_get_sessionid(current);
-        u32 sid;
 
         err = verify_newpolicy_info(p);
         if (err)
@@ -1435,8 +1430,7 @@ 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);
+        xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid);
 
         if (err) {
                 security_xfrm_policy_free(xp->security);
@@ -1675,11 +1669,8 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
         } else {
                 kuid_t loginuid = audit_get_loginuid(current);
                 unsigned int sessionid = audit_get_sessionid(current);
-                u32 sid;
 
-                security_task_getsecid(current, &sid);
-                xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
-                                         sid);
+                xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid);
 
                 if (err != 0)
                         goto out;
@@ -1709,7 +1700,6 @@ static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
 
         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 */
@@ -1902,7 +1892,6 @@ static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
 
         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 */
@@ -1971,11 +1960,9 @@ static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
         if (up->hard) {
                 kuid_t loginuid = audit_get_loginuid(current);
                 unsigned int 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);
+                xfrm_audit_policy_delete(xp, 1, loginuid, sessionid);
 
         } else {
                 // reset the timers here?
@@ -2014,11 +2001,9 @@ static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
         if (ue->hard) {
                 kuid_t loginuid = audit_get_loginuid(current);
                 unsigned int 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);
+                xfrm_audit_state_delete(x, 1, loginuid, sessionid);
         }
         err = 0;
 out: