[v19,20/23] Audit: Add new record for multiple process LSM attributes
diff mbox series

Message ID 20200724203226.16374-21-casey@schaufler-ca.com
State Superseded
Headers show
Series
  • LSM: Module stacking for AppArmor
Related show

Commit Message

Casey Schaufler July 24, 2020, 8:32 p.m. UTC
Create a new audit record type to contain the subject information
when there are multiple security modules that require such data.
This record is linked with the same timestamp and serial number.
The record is produced only in cases where there is more than one
security module with a process "context".

Before this change the only audit events that required multiple
records were syscall events. Several non-syscall events include
subject contexts, so the use of audit_context data has been expanded
as necessary.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Cc: linux-audit@redhat.com
---
 drivers/android/binder.c                |  2 +-
 include/linux/audit.h                   | 13 +++-
 include/linux/security.h                | 18 ++++-
 include/net/netlabel.h                  |  2 +-
 include/net/scm.h                       |  3 +-
 include/net/xfrm.h                      |  4 +-
 include/uapi/linux/audit.h              |  1 +
 kernel/audit.c                          | 90 ++++++++++++++++++-------
 kernel/auditfilter.c                    |  2 +-
 kernel/auditsc.c                        | 87 ++++++++++++++++++++++--
 net/ipv4/ip_sockglue.c                  |  2 +-
 net/netfilter/nf_conntrack_netlink.c    |  4 +-
 net/netfilter/nf_conntrack_standalone.c |  2 +-
 net/netfilter/nfnetlink_queue.c         |  2 +-
 net/netlabel/netlabel_unlabeled.c       | 16 ++---
 net/netlabel/netlabel_user.c            | 12 ++--
 net/netlabel/netlabel_user.h            |  6 +-
 security/integrity/integrity_audit.c    |  2 +-
 security/security.c                     | 71 ++++++++++++++-----
 security/smack/smackfs.c                |  3 +-
 20 files changed, 259 insertions(+), 83 deletions(-)

Comments

Stephen Smalley July 27, 2020, 7:04 p.m. UTC | #1
On 7/24/20 4:32 PM, Casey Schaufler wrote:

> Create a new audit record type to contain the subject information
> when there are multiple security modules that require such data.
> This record is linked with the same timestamp and serial number.
> The record is produced only in cases where there is more than one
> security module with a process "context".
>
> Before this change the only audit events that required multiple
> records were syscall events. Several non-syscall events include
> subject contexts, so the use of audit_context data has been expanded
> as necessary.
>
> Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
> Cc: linux-audit@redhat.com
> ---
> diff --git a/include/net/xfrm.h b/include/net/xfrm.h
> index c7d213c9f9d8..930432c3912e 100644
> --- a/include/net/xfrm.h
> +++ b/include/net/xfrm.h
> @@ -672,11 +672,13 @@ static inline struct audit_buffer *xfrm_audit_start(const char *op)
>   
>   	if (audit_enabled == AUDIT_OFF)
>   		return NULL;
> +	audit_stamp_context(audit_context());
>   	audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
>   				    AUDIT_MAC_IPSEC_EVENT);
>   	if (audit_buf == NULL)
>   		return NULL;
>   	audit_log_format(audit_buf, "op=%s", op);
> +	audit_log_lsm(NULL, false);

Notice that the audit_log_start() call above specified GFP_ATOMIC. But 
your audit_log_lsm() uses GFP_KERNEL. You'll either need to always use 
GFP_ATOMIC in audit_log_lsm() or pass in the gfp flags there.  Make sure 
you test with CONFIG_DEBUG_ATOMIC_SLEEP=y and check your dmesg output.

Patch
diff mbox series

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index ceb5987c7d76..99b1e65b193c 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -3109,7 +3109,7 @@  static void binder_transaction(struct binder_proc *proc,
 		size_t added_size;
 
 		security_task_getsecid(proc->tsk, &blob);
-		ret = security_secid_to_secctx(&blob, &lsmctx);
+		ret = security_secid_to_secctx(&blob, &lsmctx, LSMBLOB_DISPLAY);
 		if (ret) {
 			return_error = BR_FAILED_REPLY;
 			return_error_param = ret;
diff --git a/include/linux/audit.h b/include/linux/audit.h
index aabbbe6d9296..4693febcf41f 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -168,7 +168,9 @@  extern void		    audit_log_path_denied(int type,
 						  const char *operation);
 extern void		    audit_log_lost(const char *message);
 
-extern int audit_log_task_context(struct audit_buffer *ab);
+extern void audit_log_lsm(struct lsmblob *blob, bool exiting);
+extern int audit_log_task_context(struct audit_buffer *ab,
+				  struct lsmblob *blob);
 extern void audit_log_task_info(struct audit_buffer *ab);
 
 extern int		    audit_update_lsm_rules(void);
@@ -228,7 +230,10 @@  static inline void audit_log_key(struct audit_buffer *ab, char *key)
 { }
 static inline void audit_log_path_denied(int type, const char *operation)
 { }
-static inline int audit_log_task_context(struct audit_buffer *ab)
+static inline void audit_log_lsm(struct lsmblob *blob, bool exiting)
+{ }
+static inline int audit_log_task_context(struct audit_buffer *ab,
+					 struct lsmblob *blob);
 {
 	return 0;
 }
@@ -287,6 +292,7 @@  extern void audit_seccomp(unsigned long syscall, long signr, int code);
 extern void audit_seccomp_actions_logged(const char *names,
 					 const char *old_names, int res);
 extern void __audit_ptrace(struct task_struct *t);
+extern void audit_stamp_context(struct audit_context *ctx);
 
 static inline void audit_set_context(struct task_struct *task, struct audit_context *ctx)
 {
@@ -665,6 +671,9 @@  static inline void audit_ntp_log(const struct audit_ntp_data *ad)
 static inline void audit_ptrace(struct task_struct *t)
 { }
 
+static inline void audit_stamp_context(struct audit_context *ctx)
+{ }
+
 static inline void audit_log_nfcfg(const char *name, u8 af,
 				   unsigned int nentries,
 				   enum audit_nfcfgop op)
diff --git a/include/linux/security.h b/include/linux/security.h
index 02dc3b5ef57b..b046494ba66e 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -179,6 +179,8 @@  struct lsmblob {
 #define LSMBLOB_INVALID		-1	/* Not a valid LSM slot number */
 #define LSMBLOB_NEEDED		-2	/* Slot requested on initialization */
 #define LSMBLOB_NOT_NEEDED	-3	/* Slot not requested */
+#define LSMBLOB_DISPLAY		-4	/* Use the "display" slot */
+#define LSMBLOB_FIRST		-5	/* Use the default "display" slot */
 
 /**
  * lsmblob_init - initialize an lsmblob structure.
@@ -241,6 +243,17 @@  static inline u32 lsmblob_value(const struct lsmblob *blob)
 	return 0;
 }
 
+const char *security_lsm_slot_name(int slot);
+
+static inline bool lsm_multiple_contexts(void)
+{
+#ifdef CONFIG_SECURITY
+	return security_lsm_slot_name(1) != NULL;
+#else
+	return false;
+#endif
+}
+
 /* These functions are in security/commoncap.c */
 extern int cap_capable(const struct cred *cred, struct user_namespace *ns,
 		       int cap, unsigned int opts);
@@ -553,7 +566,8 @@  int security_setprocattr(const char *lsm, const char *name, void *value,
 			 size_t size);
 int security_netlink_send(struct sock *sk, struct sk_buff *skb);
 int security_ismaclabel(const char *name);
-int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp);
+int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp,
+			     int display);
 int security_secctx_to_secid(const char *secdata, u32 seclen,
 			     struct lsmblob *blob);
 void security_release_secctx(struct lsmcontext *cp);
@@ -1371,7 +1385,7 @@  static inline int security_ismaclabel(const char *name)
 }
 
 static inline int security_secid_to_secctx(struct lsmblob *blob,
-					   struct lsmcontext *cp)
+					   struct lsmcontext *cp, int display)
 {
 	return -EOPNOTSUPP;
 }
diff --git a/include/net/netlabel.h b/include/net/netlabel.h
index 73fc25b4042b..216cb1ffc8f0 100644
--- a/include/net/netlabel.h
+++ b/include/net/netlabel.h
@@ -97,7 +97,7 @@  struct calipso_doi;
 
 /* NetLabel audit information */
 struct netlbl_audit {
-	u32 secid;
+	struct lsmblob lsmdata;
 	kuid_t loginuid;
 	unsigned int sessionid;
 };
diff --git a/include/net/scm.h b/include/net/scm.h
index 4a6ad8caf423..8b5a4737e1b8 100644
--- a/include/net/scm.h
+++ b/include/net/scm.h
@@ -96,7 +96,8 @@  static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct sc
 	int err;
 
 	if (test_bit(SOCK_PASSSEC, &sock->flags)) {
-		err = security_secid_to_secctx(&scm->lsmblob, &context);
+		err = security_secid_to_secctx(&scm->lsmblob, &context,
+					       LSMBLOB_DISPLAY);
 
 		if (!err) {
 			put_cmsg(msg, SOL_SOCKET, SCM_SECURITY,
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index c7d213c9f9d8..930432c3912e 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -672,11 +672,13 @@  static inline struct audit_buffer *xfrm_audit_start(const char *op)
 
 	if (audit_enabled == AUDIT_OFF)
 		return NULL;
+	audit_stamp_context(audit_context());
 	audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
 				    AUDIT_MAC_IPSEC_EVENT);
 	if (audit_buf == NULL)
 		return NULL;
 	audit_log_format(audit_buf, "op=%s", op);
+	audit_log_lsm(NULL, false);
 	return audit_buf;
 }
 
@@ -690,7 +692,7 @@  static inline void xfrm_audit_helper_usrinfo(bool task_valid,
 		AUDIT_SID_UNSET;
 
 	audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
-	audit_log_task_context(audit_buf);
+	audit_log_task_context(audit_buf, NULL);
 }
 
 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
index 9b6a973f4cc3..a5403efc2fdf 100644
--- a/include/uapi/linux/audit.h
+++ b/include/uapi/linux/audit.h
@@ -139,6 +139,7 @@ 
 #define AUDIT_MAC_UNLBL_STCDEL	1417	/* NetLabel: del a static label */
 #define AUDIT_MAC_CALIPSO_ADD	1418	/* NetLabel: add CALIPSO DOI entry */
 #define AUDIT_MAC_CALIPSO_DEL	1419	/* NetLabel: del CALIPSO DOI entry */
+#define AUDIT_MAC_TASK_CONTEXTS	1420	/* Multiple LSM contexts */
 
 #define AUDIT_FIRST_KERN_ANOM_MSG   1700
 #define AUDIT_LAST_KERN_ANOM_MSG    1799
diff --git a/kernel/audit.c b/kernel/audit.c
index d300e41ca443..777d8da41082 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -389,10 +389,11 @@  static int audit_log_config_change(char *function_name, u32 new, u32 old,
 		return rc;
 	audit_log_format(ab, "op=set %s=%u old=%u ", function_name, new, old);
 	audit_log_session_info(ab);
-	rc = audit_log_task_context(ab);
+	rc = audit_log_task_context(ab, NULL);
 	if (rc)
 		allow_changes = 0; /* Something weird, deny request */
 	audit_log_format(ab, " res=%d", allow_changes);
+	audit_log_lsm(NULL, false);
 	audit_log_end(ab);
 	return rc;
 }
@@ -1065,13 +1066,31 @@  static void audit_log_common_recv_msg(struct audit_context *context,
 		return;
 	audit_log_format(*ab, "pid=%d uid=%u ", pid, uid);
 	audit_log_session_info(*ab);
-	audit_log_task_context(*ab);
+	audit_log_task_context(*ab, NULL);
 }
 
 static inline void audit_log_user_recv_msg(struct audit_buffer **ab,
 					   u16 msg_type)
 {
-	audit_log_common_recv_msg(NULL, ab, msg_type);
+	struct audit_context *context;
+
+	if (!lsm_multiple_contexts()) {
+		audit_log_common_recv_msg(NULL, ab, msg_type);
+		return;
+	}
+
+	context = audit_context();
+	if (context) {
+		if (!context->in_syscall)
+			audit_stamp_context(context);
+		audit_log_common_recv_msg(context, ab, msg_type);
+		return;
+	}
+
+	audit_alloc(current);
+	context = audit_context();
+
+	audit_log_common_recv_msg(context, ab, msg_type);
 }
 
 int is_audit_feature_set(int i)
@@ -1361,6 +1380,7 @@  static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 				audit_log_n_untrustedstring(ab, str, data_len);
 			}
 			audit_log_end(ab);
+			audit_log_lsm(NULL, false);
 		}
 		break;
 	case AUDIT_ADD_RULE:
@@ -1430,7 +1450,7 @@  static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 	case AUDIT_SIGNAL_INFO:
 		if (lsmblob_is_set(&audit_sig_lsm)) {
 			err = security_secid_to_secctx(&audit_sig_lsm,
-						       &context);
+						       &context, LSMBLOB_FIRST);
 			if (err)
 				return err;
 		}
@@ -1556,7 +1576,7 @@  static void audit_log_multicast(int group, const char *op, int err)
 			 tty ? tty_name(tty) : "(none)",
 			 audit_get_sessionid(current));
 	audit_put_tty(tty);
-	audit_log_task_context(ab); /* subj= */
+	audit_log_task_context(ab, NULL); /* subj= */
 	audit_log_format(ab, " comm=");
 	audit_log_untrustedstring(ab, get_task_comm(comm, current));
 	audit_log_d_path_exe(ab, current->mm); /* exe= */
@@ -1851,6 +1871,11 @@  struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
 
 	audit_get_stamp(ab->ctx, &t, &serial);
 	audit_clear_dummy(ab->ctx);
+
+	if (type == AUDIT_MAC_TASK_CONTEXTS && ab->ctx->serial == 0) {
+		audit_stamp_context(ab->ctx);
+		audit_get_stamp(ab->ctx, &t, &serial);
+	}
 	audit_log_format(ab, "audit(%llu.%03lu:%u): ",
 			 (unsigned long long)t.tv_sec, t.tv_nsec/1000000, serial);
 
@@ -2108,30 +2133,47 @@  void audit_log_key(struct audit_buffer *ab, char *key)
 		audit_log_format(ab, "(null)");
 }
 
-int audit_log_task_context(struct audit_buffer *ab)
+int audit_log_task_context(struct audit_buffer *ab, struct lsmblob *blob)
 {
+	int i;
 	int error;
-	struct lsmblob blob;
-	struct lsmcontext context;
+	struct lsmblob localblob;
+	struct lsmcontext lsmdata;
 
-	security_task_getsecid(current, &blob);
-	if (!lsmblob_is_set(&blob))
+	/*
+	 * If there is more than one security module that has a
+	 * subject "context" it's necessary to put the subject data
+	 * into a separate record to maintain compatibility.
+	 */
+	if (lsm_multiple_contexts()) {
+		audit_log_format(ab, " subj=?");
 		return 0;
+	}
 
-	error = security_secid_to_secctx(&blob, &context);
-	if (error) {
-		if (error != -EINVAL)
-			goto error_path;
-		return 0;
+	if (blob == NULL) {
+		security_task_getsecid(current, &localblob);
+		if (!lsmblob_is_set(&localblob)) {
+			audit_log_format(ab, " subj=?");
+			return 0;
+		}
+		blob = &localblob;
 	}
 
-	audit_log_format(ab, " subj=%s", context.context);
-	security_release_secctx(&context);
-	return 0;
+	for (i = 0; i < LSMBLOB_ENTRIES; i++) {
+		if (blob->secid[i] == 0)
+			continue;
+		error = security_secid_to_secctx(blob, &lsmdata, i);
+		if (error && error != -EINVAL) {
+			audit_panic("error in audit_log_task_context");
+			return error;
+		}
+
+		audit_log_format(ab, " subj=%s", lsmdata.context);
+		security_release_secctx(&lsmdata);
+		break;
+	}
 
-error_path:
-	audit_panic("error in audit_log_task_context");
-	return error;
+	return 0;
 }
 EXPORT_SYMBOL(audit_log_task_context);
 
@@ -2203,7 +2245,7 @@  void audit_log_task_info(struct audit_buffer *ab)
 	audit_log_format(ab, " comm=");
 	audit_log_untrustedstring(ab, get_task_comm(comm, current));
 	audit_log_d_path_exe(ab, current->mm);
-	audit_log_task_context(ab);
+	audit_log_task_context(ab, NULL);
 }
 EXPORT_SYMBOL(audit_log_task_info);
 
@@ -2261,6 +2303,7 @@  static void audit_log_set_loginuid(kuid_t koldloginuid, kuid_t kloginuid,
 	if (!audit_enabled)
 		return;
 
+	audit_stamp_context(audit_context());
 	ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_LOGIN);
 	if (!ab)
 		return;
@@ -2271,11 +2314,12 @@  static void audit_log_set_loginuid(kuid_t koldloginuid, kuid_t kloginuid,
 	tty = audit_get_tty();
 
 	audit_log_format(ab, "pid=%d uid=%u", task_tgid_nr(current), uid);
-	audit_log_task_context(ab);
+	audit_log_task_context(ab, NULL);
 	audit_log_format(ab, " old-auid=%u auid=%u tty=%s old-ses=%u ses=%u res=%d",
 			 oldloginuid, loginuid, tty ? tty_name(tty) : "(none)",
 			 oldsessionid, sessionid, !rc);
 	audit_put_tty(tty);
+	audit_log_lsm(NULL, true);
 	audit_log_end(ab);
 }
 
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 31732023b689..6c03e463668e 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -1107,7 +1107,7 @@  static void audit_log_rule_change(char *action, struct audit_krule *rule, int re
 	if (!ab)
 		return;
 	audit_log_session_info(ab);
-	audit_log_task_context(ab);
+	audit_log_task_context(ab, NULL);
 	audit_log_format(ab, " op=%s", action);
 	audit_log_key(ab, rule->filterkey);
 	audit_log_format(ab, " list=%d res=%d", rule->listnr, res);
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 1f7bd6b34ec7..55642a039632 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -455,7 +455,7 @@  static int audit_filter_rules(struct task_struct *tsk,
 {
 	const struct cred *cred;
 	int i, need_sid = 1;
-	struct lsmblob blob;
+	struct lsmblob blob = { };
 	unsigned int sessionid;
 
 	cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation);
@@ -944,10 +944,12 @@  int audit_alloc(struct task_struct *tsk)
 		return 0; /* Return if not auditing. */
 
 	state = audit_filter_task(tsk, &key);
-	if (state == AUDIT_DISABLED) {
+	if (!lsm_multiple_contexts() && state == AUDIT_DISABLED) {
 		clear_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
 		return 0;
 	}
+	if (state == AUDIT_DISABLED)
+		clear_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
 
 	if (!(context = audit_alloc_context(state))) {
 		kfree(key);
@@ -991,7 +993,7 @@  static int audit_log_pid_context(struct audit_context *context, pid_t pid,
 			 from_kuid(&init_user_ns, auid),
 			 from_kuid(&init_user_ns, uid), sessionid);
 	if (lsmblob_is_set(blob)) {
-		if (security_secid_to_secctx(blob, &lsmctx)) {
+		if (security_secid_to_secctx(blob, &lsmctx, LSMBLOB_FIRST)) {
 			audit_log_format(ab, " obj=(none)");
 			rc = 1;
 		} else {
@@ -1236,7 +1238,8 @@  static void show_special(struct audit_context *context, int *call_panic)
 			struct lsmblob blob;
 
 			lsmblob_init(&blob, osid);
-			if (security_secid_to_secctx(&blob, &lsmcxt)) {
+			if (security_secid_to_secctx(&blob, &lsmcxt,
+						     LSMBLOB_FIRST)) {
 				audit_log_format(ab, " osid=%u", osid);
 				*call_panic = 1;
 			} else {
@@ -1388,7 +1391,7 @@  static void audit_log_name(struct audit_context *context, struct audit_names *n,
 		struct lsmcontext lsmctx;
 
 		lsmblob_init(&blob, n->osid);
-		if (security_secid_to_secctx(&blob, &lsmctx)) {
+		if (security_secid_to_secctx(&blob, &lsmctx, LSMBLOB_FIRST)) {
 			audit_log_format(ab, " osid=%u", n->osid);
 			if (call_panic)
 				*call_panic = 2;
@@ -1462,6 +1465,52 @@  static void audit_log_proctitle(void)
 	audit_log_end(ab);
 }
 
+void audit_log_lsm(struct lsmblob *blob, bool exiting)
+{
+	struct audit_context *context = audit_context();
+	struct lsmcontext lsmdata;
+	struct audit_buffer *ab;
+	struct lsmblob localblob;
+	bool sep = false;
+	int error;
+	int i;
+
+	if (!lsm_multiple_contexts())
+		return;
+
+	if (context && context->in_syscall && !exiting)
+		return;
+
+	ab = audit_log_start(context, GFP_KERNEL, AUDIT_MAC_TASK_CONTEXTS);
+	if (!ab)
+		return;	/* audit_panic or being filtered */
+
+	if (blob == NULL) {
+		security_task_getsecid(current, &localblob);
+		if (!lsmblob_is_set(&localblob))
+			return;
+		blob = &localblob;
+	}
+
+	for (i = 0; i < LSMBLOB_ENTRIES; i++) {
+		if (blob->secid[i] == 0)
+			continue;
+		error = security_secid_to_secctx(blob, &lsmdata, i);
+		if (error && error != -EINVAL) {
+			audit_panic("error in audit_log_lsm");
+			return;
+		}
+
+		audit_log_format(ab, "%ssubj_%s=%s", sep ? " " : "",
+				 security_lsm_slot_name(i), lsmdata.context);
+		sep = true;
+
+		security_release_secctx(&lsmdata);
+	}
+
+	audit_log_end(ab);
+}
+
 static void audit_log_exit(void)
 {
 	int i, call_panic = 0;
@@ -1585,6 +1634,7 @@  static void audit_log_exit(void)
 	}
 
 	audit_log_proctitle();
+	audit_log_lsm(NULL, true);
 
 	/* Send end of event record to help user space know we are finished */
 	ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE);
@@ -2183,6 +2233,21 @@  void __audit_inode_child(struct inode *parent,
 }
 EXPORT_SYMBOL_GPL(__audit_inode_child);
 
+/**
+ * audit_stamp_context - set the timestamp+serial in an audit context
+ * @ctx: audit_context to set
+ */
+void audit_stamp_context(struct audit_context *ctx)
+{
+	/* ctx will be NULL unless lsm_multiple_contexts() is true */
+	if (!ctx)
+		return;
+
+	ktime_get_coarse_real_ts64(&ctx->ctime);
+	ctx->serial = audit_serial();
+	ctx->current_state = AUDIT_BUILD_CONTEXT;
+}
+ 
 /**
  * auditsc_get_stamp - get local copies of audit_context values
  * @ctx: audit_context for the task
@@ -2194,6 +2259,12 @@  EXPORT_SYMBOL_GPL(__audit_inode_child);
 int auditsc_get_stamp(struct audit_context *ctx,
 		       struct timespec64 *t, unsigned int *serial)
 {
+	if (ctx->serial && !ctx->in_syscall) {
+		t->tv_sec  = ctx->ctime.tv_sec;
+		t->tv_nsec = ctx->ctime.tv_nsec;
+		*serial    = ctx->serial;
+		return 1;
+	}
 	if (!ctx->in_syscall)
 		return 0;
 	if (!ctx->serial)
@@ -2588,7 +2659,7 @@  void __audit_log_nfcfg(const char *name, u8 af, unsigned int nentries,
 			 name, af, nentries, audit_nfcfgs[op].s);
 
 	audit_log_format(ab, " pid=%u", task_pid_nr(current));
-	audit_log_task_context(ab); /* subj= */
+	audit_log_task_context(ab, NULL); /* subj= */
 	audit_log_format(ab, " comm=");
 	audit_log_untrustedstring(ab, get_task_comm(comm, current));
 	audit_log_end(ab);
@@ -2611,7 +2682,7 @@  static void audit_log_task(struct audit_buffer *ab)
 			 from_kuid(&init_user_ns, uid),
 			 from_kgid(&init_user_ns, gid),
 			 sessionid);
-	audit_log_task_context(ab);
+	audit_log_task_context(ab, NULL);
 	audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current));
 	audit_log_untrustedstring(ab, get_task_comm(comm, current));
 	audit_log_d_path_exe(ab, current->mm);
@@ -2634,11 +2705,13 @@  void audit_core_dumps(long signr)
 	if (signr == SIGQUIT)	/* don't care for those */
 		return;
 
+	audit_stamp_context(audit_context());
 	ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_ANOM_ABEND);
 	if (unlikely(!ab))
 		return;
 	audit_log_task(ab);
 	audit_log_format(ab, " sig=%ld res=1", signr);
+	audit_log_lsm(NULL, true);
 	audit_log_end(ab);
 }
 
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 176ac9ce6069..e5c7a1b94ca4 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -138,7 +138,7 @@  static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
 	if (err)
 		return;
 
-	err = security_secid_to_secctx(&lb, &context);
+	err = security_secid_to_secctx(&lb, &context, LSMBLOB_DISPLAY);
 	if (err)
 		return;
 
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index e38b5182e301..3c90b9a488d5 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -339,7 +339,7 @@  static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
 	 * security_secid_to_secctx() will know which security module
 	 * to use to create the secctx.  */
 	lsmblob_init(&blob, ct->secmark);
-	ret = security_secid_to_secctx(&blob, &context);
+	ret = security_secid_to_secctx(&blob, &context, LSMBLOB_DISPLAY);
 	if (ret)
 		return 0;
 
@@ -655,7 +655,7 @@  static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
 	struct lsmblob blob;
 	struct lsmcontext context;
 
-	ret = security_secid_to_secctx(&blob, &context);
+	ret = security_secid_to_secctx(&blob, &context, LSMBLOB_DISPLAY);
 	if (ret)
 		return 0;
 
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 0ecd1040f4f1..de85317a366e 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -177,7 +177,7 @@  static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
 	struct lsmcontext context;
 
 	lsmblob_init(&blob, ct->secmark);
-	ret = security_secid_to_secctx(&blob, &context);
+	ret = security_secid_to_secctx(&blob, &context, LSMBLOB_DISPLAY);
 	if (ret)
 		return;
 
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index a4d4602ab9b7..15cabd7be92a 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -316,7 +316,7 @@  static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, struct lsmcontext *context)
 		 * blob. security_secid_to_secctx() will know which security
 		 * module to use to create the secctx.  */
 		lsmblob_init(&blob, skb->secmark);
-		security_secid_to_secctx(&blob, context);
+		security_secid_to_secctx(&blob, context, LSMBLOB_DISPLAY);
 	}
 
 	read_unlock_bh(&skb->sk->sk_callback_lock);
diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index c14a485ff045..99579fa49293 100644
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -437,7 +437,8 @@  int netlbl_unlhsh_add(struct net *net,
 unlhsh_add_return:
 	rcu_read_unlock();
 	if (audit_buf != NULL) {
-		if (security_secid_to_secctx(lsmblob, &context) == 0) {
+		if (security_secid_to_secctx(lsmblob, &context,
+					     LSMBLOB_FIRST) == 0) {
 			audit_log_format(audit_buf, " sec_obj=%s",
 					 context.context);
 			security_release_secctx(&context);
@@ -492,7 +493,8 @@  static int netlbl_unlhsh_remove_addr4(struct net *net,
 		if (dev != NULL)
 			dev_put(dev);
 		if (entry != NULL &&
-		    security_secid_to_secctx(&entry->lsmblob, &context) == 0) {
+		    security_secid_to_secctx(&entry->lsmblob, &context,
+					     LSMBLOB_FIRST) == 0) {
 			audit_log_format(audit_buf, " sec_obj=%s",
 					 context.context);
 			security_release_secctx(&context);
@@ -552,7 +554,8 @@  static int netlbl_unlhsh_remove_addr6(struct net *net,
 		if (dev != NULL)
 			dev_put(dev);
 		if (entry != NULL &&
-		    security_secid_to_secctx(&entry->lsmblob, &context) == 0) {
+		    security_secid_to_secctx(&entry->lsmblob, &context,
+					     LSMBLOB_FIRST) == 0) {
 			audit_log_format(audit_buf, " sec_obj=%s",
 					 context.context);
 			security_release_secctx(&context);
@@ -1122,7 +1125,7 @@  static int netlbl_unlabel_staticlist_gen(u32 cmd,
 		lsmb = (struct lsmblob *)&addr6->lsmblob;
 	}
 
-	ret_val = security_secid_to_secctx(lsmb, &context);
+	ret_val = security_secid_to_secctx(lsmb, &context, LSMBLOB_FIRST);
 	if (ret_val != 0)
 		goto list_cb_failure;
 	ret_val = nla_put(cb_arg->skb,
@@ -1521,14 +1524,11 @@  int __init netlbl_unlabel_defconf(void)
 	int ret_val;
 	struct netlbl_dom_map *entry;
 	struct netlbl_audit audit_info;
-	struct lsmblob blob;
 
 	/* Only the kernel is allowed to call this function and the only time
 	 * it is called is at bootup before the audit subsystem is reporting
 	 * messages so don't worry to much about these values. */
-	security_task_getsecid(current, &blob);
-	/* scaffolding until audit_info.secid is converted */
-	audit_info.secid = blob.secid[0];
+	security_task_getsecid(current, &audit_info.lsmdata);
 	audit_info.loginuid = GLOBAL_ROOT_UID;
 	audit_info.sessionid = 0;
 
diff --git a/net/netlabel/netlabel_user.c b/net/netlabel/netlabel_user.c
index 951ba0639d20..4e9064754b5f 100644
--- a/net/netlabel/netlabel_user.c
+++ b/net/netlabel/netlabel_user.c
@@ -84,12 +84,12 @@  struct audit_buffer *netlbl_audit_start_common(int type,
 					       struct netlbl_audit *audit_info)
 {
 	struct audit_buffer *audit_buf;
-	struct lsmcontext context;
-	struct lsmblob blob;
 
 	if (audit_enabled == AUDIT_OFF)
 		return NULL;
 
+	audit_stamp_context(audit_context());
+
 	audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, type);
 	if (audit_buf == NULL)
 		return NULL;
@@ -98,12 +98,8 @@  struct audit_buffer *netlbl_audit_start_common(int type,
 			 from_kuid(&init_user_ns, audit_info->loginuid),
 			 audit_info->sessionid);
 
-	lsmblob_init(&blob, audit_info->secid);
-	if (audit_info->secid != 0 &&
-	    security_secid_to_secctx(&blob, &context) == 0) {
-		audit_log_format(audit_buf, " subj=%s", context.context);
-		security_release_secctx(&context);
-	}
+	audit_log_task_context(audit_buf, &audit_info->lsmdata);
+	audit_log_lsm(&audit_info->lsmdata, false);
 
 	return audit_buf;
 }
diff --git a/net/netlabel/netlabel_user.h b/net/netlabel/netlabel_user.h
index 438b5db6c714..bd4335443b87 100644
--- a/net/netlabel/netlabel_user.h
+++ b/net/netlabel/netlabel_user.h
@@ -34,11 +34,7 @@ 
 static inline void netlbl_netlink_auditinfo(struct sk_buff *skb,
 					    struct netlbl_audit *audit_info)
 {
-	struct lsmblob blob;
-
-	security_task_getsecid(current, &blob);
-	/* scaffolding until secid is converted */
-	audit_info->secid = blob.secid[0];
+	security_task_getsecid(current, &audit_info->lsmdata);
 	audit_info->loginuid = audit_get_loginuid(current);
 	audit_info->sessionid = audit_get_sessionid(current);
 }
diff --git a/security/integrity/integrity_audit.c b/security/integrity/integrity_audit.c
index 5109173839cc..00d8aa358651 100644
--- a/security/integrity/integrity_audit.c
+++ b/security/integrity/integrity_audit.c
@@ -41,7 +41,7 @@  void integrity_audit_msg(int audit_msgno, struct inode *inode,
 			 from_kuid(&init_user_ns, current_cred()->uid),
 			 from_kuid(&init_user_ns, audit_get_loginuid(current)),
 			 audit_get_sessionid(current));
-	audit_log_task_context(ab);
+	audit_log_task_context(ab, NULL);
 	audit_log_format(ab, " op=%s cause=%s comm=", op, cause);
 	audit_log_untrustedstring(ab, get_task_comm(name, current));
 	if (fname) {
diff --git a/security/security.c b/security/security.c
index 95b48721fb17..d35e578fa45b 100644
--- a/security/security.c
+++ b/security/security.c
@@ -480,7 +480,31 @@  static int lsm_append(const char *new, char **result)
  * Pointers to the LSM id structures for local use.
  */
 static int lsm_slot __lsm_ro_after_init;
-static struct lsm_id *lsm_slotlist[LSMBLOB_ENTRIES];
+static struct lsm_id *lsm_slotlist[LSMBLOB_ENTRIES] __lsm_ro_after_init;
+
+/**
+ * security_lsm_slot_name - Get the name of the security module in a slot
+ * @slot: index into the "display" slot list.
+ *
+ * Provide the name of the security module associated with
+ * a display slot.
+ *
+ * If @slot is LSMBLOB_INVALID return the value
+ * for slot 0 if it has been set, otherwise NULL.
+ *
+ * Returns a pointer to the name string or NULL.
+ */
+const char *security_lsm_slot_name(int slot)
+{
+	if (slot == LSMBLOB_INVALID)
+		slot = 0;
+	else if (slot >= LSMBLOB_ENTRIES || slot < 0)
+		return NULL;
+
+	if (lsm_slotlist[slot] == NULL)
+		return NULL;
+	return lsm_slotlist[slot]->lsm;
+}
 
 /**
  * security_add_hooks - Add a modules hooks to the hook lists.
@@ -2220,13 +2244,32 @@  int security_ismaclabel(const char *name)
 }
 EXPORT_SYMBOL(security_ismaclabel);
 
-int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp)
+int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp,
+			     int display)
 {
 	struct security_hook_list *hp;
-	int display = lsm_task_display(current);
 
 	memset(cp, 0, sizeof(*cp));
 
+	/*
+	 * display either is the slot number use for formatting
+	 * or an instruction on which relative slot to use.
+	 */
+	if (display == LSMBLOB_DISPLAY)
+		display = lsm_task_display(current);
+	else if (display == LSMBLOB_FIRST)
+		display = LSMBLOB_INVALID;
+	else if (display < 0) {
+		WARN_ONCE(true,
+			"LSM: %s unknown display\n", __func__);
+		display = LSMBLOB_INVALID;
+	} else if (display >= lsm_slot) {
+		WARN_ONCE(true,
+			"LSM: %s invalid display\n", __func__);
+		display = LSMBLOB_INVALID;
+	}
+
+
 	hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) {
 		if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
 			continue;
@@ -2256,7 +2299,7 @@  int security_secctx_to_secid(const char *secdata, u32 seclen,
 			return hp->hook.secctx_to_secid(secdata, seclen,
 						&blob->secid[hp->lsmid->slot]);
 	}
-	return 0;
+	return -EOPNOTSUPP;
 }
 EXPORT_SYMBOL(security_secctx_to_secid);
 
@@ -2757,23 +2800,17 @@  int security_key_getsecurity(struct key *key, char **_buffer)
 int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule)
 {
 	struct security_hook_list *hp;
-	bool one_is_good = false;
-	int rc = 0;
-	int trc;
+	int display = lsm_task_display(current);
 
 	hlist_for_each_entry(hp, &security_hook_heads.audit_rule_init, list) {
 		if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
 			continue;
-		trc = hp->hook.audit_rule_init(field, op, rulestr,
-					       &lsmrule[hp->lsmid->slot]);
-		if (trc == 0)
-			one_is_good = true;
-		else
-			rc = trc;
+		if (display != LSMBLOB_INVALID && display != hp->lsmid->slot)
+			continue;
+		return hp->hook.audit_rule_init(field, op, rulestr,
+						&lsmrule[hp->lsmid->slot]);
 	}
-	if (one_is_good)
-		return 0;
-	return rc;
+	return 0;
 }
 
 int security_audit_rule_known(struct audit_krule *krule)
@@ -2805,6 +2842,8 @@  int security_audit_rule_match(struct lsmblob *blob, u32 field, u32 op,
 			continue;
 		if (lsmrule[hp->lsmid->slot] == NULL)
 			continue;
+		if (lsmrule[hp->lsmid->slot] == NULL)
+			continue;
 		rc = hp->hook.audit_rule_match(blob->secid[hp->lsmid->slot],
 					       field, op,
 					       &lsmrule[hp->lsmid->slot]);
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index 177e69b43a52..2abdb45b3a61 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -185,7 +185,8 @@  static void smk_netlabel_audit_set(struct netlbl_audit *nap)
 
 	nap->loginuid = audit_get_loginuid(current);
 	nap->sessionid = audit_get_sessionid(current);
-	nap->secid = skp->smk_secid;
+	lsmblob_init(&nap->lsmdata, 0);
+	nap->lsmdata.secid[smack_lsmid.slot] = skp->smk_secid;
 }
 
 /*