diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index d526595bc959..76e16c5251b9 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -65,7 +65,6 @@ struct usb_dev_state {
 	const struct cred *cred;
 	void __user *disccontext;
 	unsigned long ifclaimed;
-	u32 secid;
 	u32 disabled_bulk_eps;
 	bool privileges_dropped;
 	unsigned long interface_allowed_mask;
@@ -95,7 +94,6 @@ struct async {
 	struct usb_memory *usbm;
 	unsigned int mem_usage;
 	int status;
-	u32 secid;
 	u8 bulk_addr;
 	u8 bulk_status;
 };
@@ -586,7 +584,6 @@ static void async_completed(struct urb *urb)
 	struct usb_dev_state *ps = as->ps;
 	struct siginfo sinfo;
 	struct pid *pid = NULL;
-	u32 secid = 0;
 	const struct cred *cred = NULL;
 	int signr;
 
@@ -602,7 +599,6 @@ static void async_completed(struct urb *urb)
 		sinfo.si_addr = as->userurb;
 		pid = get_pid(as->pid);
 		cred = get_cred(as->cred);
-		secid = as->secid;
 	}
 	snoop(&urb->dev->dev, "urb complete\n");
 	snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
@@ -618,7 +614,7 @@ static void async_completed(struct urb *urb)
 	spin_unlock(&ps->lock);
 
 	if (signr) {
-		kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
+		kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred);
 		put_pid(pid);
 		put_cred(cred);
 	}
@@ -1013,7 +1009,6 @@ static int usbdev_open(struct inode *inode, struct file *file)
 	init_waitqueue_head(&ps->wait);
 	ps->disc_pid = get_pid(task_pid(current));
 	ps->cred = get_current_cred();
-	security_task_getsecid(current, &ps->secid);
 	smp_wmb();
 	list_add_tail(&ps->list, &dev->filelist);
 	file->private_data = ps;
@@ -1727,7 +1722,6 @@ static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb
 	as->ifnum = ifnum;
 	as->pid = get_pid(task_pid(current));
 	as->cred = get_current_cred();
-	security_task_getsecid(current, &as->secid);
 	snoop_urb(ps->dev, as->userurb, as->urb->pipe,
 			as->urb->transfer_buffer_length, 0, SUBMIT,
 			NULL, 0);
@@ -2617,7 +2611,7 @@ static void usbdev_remove(struct usb_device *udev)
 			sinfo.si_code = SI_ASYNCIO;
 			sinfo.si_addr = ps->disccontext;
 			kill_pid_info_as_cred(ps->discsignr, &sinfo,
-					ps->disc_pid, ps->cred, ps->secid);
+					ps->disc_pid, ps->cred);
 		}
 	}
 }
diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 7161d8e7ee79..e0ac011d07a5 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -672,7 +672,8 @@
  *	@p contains the task_struct for process.
  *	@info contains the signal information.
  *	@sig contains the signal value.
- *	@secid contains the sid of the process where the signal originated
+ *	@cred contains the cred of the process where the signal originated, or
+ *	NULL if the current task is the originator.
  *	Return 0 if permission is granted.
  * @task_prctl:
  *	Check permission before performing a process control operation on the
@@ -1564,7 +1565,7 @@ union security_list_options {
 	int (*task_getscheduler)(struct task_struct *p);
 	int (*task_movememory)(struct task_struct *p);
 	int (*task_kill)(struct task_struct *p, struct siginfo *info,
-				int sig, u32 secid);
+				int sig, const struct cred *cred);
 	int (*task_prctl)(int option, unsigned long arg2, unsigned long arg3,
 				unsigned long arg4, unsigned long arg5);
 	void (*task_to_inode)(struct task_struct *p, struct inode *inode);
diff --git a/include/linux/sched/signal.h b/include/linux/sched/signal.h
index 23b4f9cb82db..a7ce74c74e49 100644
--- a/include/linux/sched/signal.h
+++ b/include/linux/sched/signal.h
@@ -319,7 +319,7 @@ extern int force_sig_info(int, struct siginfo *, struct task_struct *);
 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
 extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *,
-				const struct cred *, u32);
+				const struct cred *);
 extern int kill_pgrp(struct pid *pid, int sig, int priv);
 extern int kill_pid(struct pid *pid, int sig, int priv);
 extern __must_check bool do_notify_parent(struct task_struct *, int);
diff --git a/include/linux/security.h b/include/linux/security.h
index 73f1ef625d40..3f5fd988ee87 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -347,7 +347,7 @@ int security_task_setscheduler(struct task_struct *p);
 int security_task_getscheduler(struct task_struct *p);
 int security_task_movememory(struct task_struct *p);
 int security_task_kill(struct task_struct *p, struct siginfo *info,
-			int sig, u32 secid);
+			int sig, const struct cred *cred);
 int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
 			unsigned long arg4, unsigned long arg5);
 void security_task_to_inode(struct task_struct *p, struct inode *inode);
@@ -1010,7 +1010,7 @@ static inline int security_task_movememory(struct task_struct *p)
 
 static inline int security_task_kill(struct task_struct *p,
 				     struct siginfo *info, int sig,
-				     u32 secid)
+				     const struct cred *cred)
 {
 	return 0;
 }
diff --git a/kernel/signal.c b/kernel/signal.c
index c6e4c83dc090..b033292f4beb 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -770,7 +770,7 @@ static int check_kill_permission(int sig, struct siginfo *info,
 		}
 	}
 
-	return security_task_kill(t, info, sig, 0);
+	return security_task_kill(t, info, sig, NULL);
 }
 
 /**
@@ -1361,7 +1361,7 @@ static int kill_as_cred_perm(const struct cred *cred,
 
 /* like kill_pid_info(), but doesn't use uid/euid of "current" */
 int kill_pid_info_as_cred(int sig, struct siginfo *info, struct pid *pid,
-			 const struct cred *cred, u32 secid)
+			 const struct cred *cred)
 {
 	int ret = -EINVAL;
 	struct task_struct *p;
@@ -1380,7 +1380,7 @@ int kill_pid_info_as_cred(int sig, struct siginfo *info, struct pid *pid,
 		ret = -EPERM;
 		goto out_unlock;
 	}
-	ret = security_task_kill(p, info, sig, secid);
+	ret = security_task_kill(p, info, sig, cred);
 	if (ret)
 		goto out_unlock;
 
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 9a65eeaf7dfa..77bdfa7f8428 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -717,16 +717,23 @@ static int apparmor_task_setrlimit(struct task_struct *task,
 }
 
 static int apparmor_task_kill(struct task_struct *target, struct siginfo *info,
-			      int sig, u32 secid)
+			      int sig, const struct cred *cred)
 {
 	struct aa_label *cl, *tl;
 	int error;
 
-	if (secid)
-		/* TODO: after secid to label mapping is done.
-		 *  Dealing with USB IO specific behavior
+	if (cred) {
+		/*
+		 * Dealing with USB IO specific behavior
 		 */
-		return 0;
+		cl = aa_get_newest_cred_label(cred);
+		tl = aa_get_task_label(target);
+		error = aa_may_signal(cl, tl, sig);
+		aa_put_label(cl);
+		aa_put_label(tl);
+		return error;
+	}
+
 	cl = __begin_current_label_crit_section();
 	tl = aa_get_task_label(target);
 	error = aa_may_signal(cl, tl, sig);
diff --git a/security/security.c b/security/security.c
index 1cd8526cb0b7..14c291910d25 100644
--- a/security/security.c
+++ b/security/security.c
@@ -1114,9 +1114,9 @@ int security_task_movememory(struct task_struct *p)
 }
 
 int security_task_kill(struct task_struct *p, struct siginfo *info,
-			int sig, u32 secid)
+			int sig, const struct cred *cred)
 {
-	return call_int_hook(task_kill, 0, p, info, sig, secid);
+	return call_int_hook(task_kill, 0, p, info, sig, cred);
 }
 
 int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 8644d864e3c1..8abd542c6b7c 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -4036,16 +4036,19 @@ static int selinux_task_movememory(struct task_struct *p)
 }
 
 static int selinux_task_kill(struct task_struct *p, struct siginfo *info,
-				int sig, u32 secid)
+				int sig, const struct cred *cred)
 {
+	u32 secid;
 	u32 perm;
 
 	if (!sig)
 		perm = PROCESS__SIGNULL; /* null signal; existence test */
 	else
 		perm = signal_to_av(sig);
-	if (!secid)
+	if (!cred)
 		secid = current_sid();
+	else
+		secid = cred_sid(cred);
 	return avc_has_perm(secid, task_sid(p), SECCLASS_PROCESS, perm, NULL);
 }
 
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 03fdecba93bb..feada2665322 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -2228,15 +2228,13 @@ static int smack_task_movememory(struct task_struct *p)
  * @p: the task object
  * @info: unused
  * @sig: unused
- * @secid: identifies the smack to use in lieu of current's
+ * @cred: identifies the cred to use in lieu of current's
  *
  * Return 0 if write access is permitted
  *
- * The secid behavior is an artifact of an SELinux hack
- * in the USB code. Someday it may go away.
  */
 static int smack_task_kill(struct task_struct *p, struct siginfo *info,
-			   int sig, u32 secid)
+			   int sig, const struct cred *cred)
 {
 	struct smk_audit_info ad;
 	struct smack_known *skp;
@@ -2252,17 +2250,17 @@ static int smack_task_kill(struct task_struct *p, struct siginfo *info,
 	 * Sending a signal requires that the sender
 	 * can write the receiver.
 	 */
-	if (secid == 0) {
+	if (cred == NULL) {
 		rc = smk_curacc(tkp, MAY_DELIVER, &ad);
 		rc = smk_bu_task(p, MAY_DELIVER, rc);
 		return rc;
 	}
 	/*
-	 * If the secid isn't 0 we're dealing with some USB IO
+	 * If the cred isn't NULL we're dealing with some USB IO
 	 * specific behavior. This is not clean. For one thing
 	 * we can't take privilege into account.
 	 */
-	skp = smack_from_secid(secid);
+	skp = smk_of_task(cred->security);
 	rc = smk_access(skp, tkp, MAY_DELIVER, &ad);
 	rc = smk_bu_note("USB signal", skp, tkp, MAY_DELIVER, rc);
 	return rc;