diff --git a/kernel-src/include/kernel/signal.h b/kernel-src/include/kernel/signal.h
index a6465099..126eeaa4 100644
--- a/kernel-src/include/kernel/signal.h
+++ b/kernel-src/include/kernel/signal.h
@@ -14,9 +14,9 @@ typedef struct {
 	uint64_t sig[1024 / 64];
 } sigset_t;
 
-#define SIGNAL_GET(sigset, signal) ((sigset)->sig[(signal) / 64] & (1lu << ((signal) % 64)))
-#define SIGNAL_SETON(sigset, signal) (sigset)->sig[(signal) / 64] |= (1lu << ((signal) % 64))
-#define SIGNAL_SETOFF(sigset, signal) (sigset)->sig[(signal) / 64] &= ~(1lu << ((signal) % 64))
+#define SIGNAL_GET(sigset, signal) ((sigset)->sig[((signal) - 1) / 64] & (1lu << (((signal) - 1) % 64)))
+#define SIGNAL_SETON(sigset, signal) (sigset)->sig[((signal) - 1) / 64] |= (1lu << (((signal) - 1) % 64))
+#define SIGNAL_SETOFF(sigset, signal) (sigset)->sig[((signal) - 1) / 64] &= ~(1lu << (((signal) - 1) % 64))
 
 #define SIG_DFL ((void *)(0))
 #define SIG_IGN ((void *)(1))
diff --git a/kernel-src/sys/scheduler.c b/kernel-src/sys/scheduler.c
index 19cfcf54..1d3e4353 100644
--- a/kernel-src/sys/scheduler.c
+++ b/kernel-src/sys/scheduler.c
@@ -64,7 +64,7 @@ int sched_signalall(int signal, proc_t *sender) {
 
 		pid_t currentpgid = jobctl_getpgid(current);
 
-		if (senderpgid == 0 || (signal == SIGCONT && currentpgid == senderpgid) || auth_process_check(&sender->cred, AUTH_ACTIONS_PROCESS_SIGNAL, current)) {
+		if (senderpgid == 0 || (signal == SIGCONT && currentpgid == senderpgid) || auth_process_check(&sender->cred, AUTH_ACTIONS_PROCESS_SIGNAL, current) == 0) {
 			++donecount;
 			signal_signalproc(current, signal);
 		}
diff --git a/kernel-src/sys/signal.c b/kernel-src/sys/signal.c
index ceb37e39..7a692777 100644
--- a/kernel-src/sys/signal.c
+++ b/kernel-src/sys/signal.c
@@ -96,7 +96,7 @@ void signal_changemask(struct thread_t *thread, int how, sigset_t *new, sigset_t
 		switch (how) {
 			case SIG_BLOCK:
 			case SIG_UNBLOCK: {
-				for (int i = 0; i < NSIG; ++i) {
+				for (int i = 1; i < NSIG; ++i) {
 					if (SIGNAL_GET(new, i) == 0)
 						continue;
 
@@ -127,7 +127,7 @@ void signal_pending(struct thread_t *thread, sigset_t *sigset) {
 	// urgent set doesn't get returned here as it will always be handled
 	// before a return to userspace
 	memset(sigset, 0, sizeof(sigset_t));
-	for (int i = 0; i < NSIG; ++i) {
+	for (int i = 1; i < NSIG; ++i) {
 		if (SIGNAL_GET(&proc->signals.pending, i))
 			SIGNAL_SETON(sigset, i);
 		
@@ -275,7 +275,7 @@ bool signal_check(struct thread_t *thread, context_t *context, bool syscall, uin
 	sigset_t *sigset = NULL;
 
 	// check the urgent sigset first
-	for (int i = 0; i < NSIG; ++i) {
+	for (int i = 1; i < NSIG; ++i) {
 		if (SIGNAL_GET(&thread->signals.urgent, i) == 0)
 			continue;
 
@@ -283,7 +283,7 @@ bool signal_check(struct thread_t *thread, context_t *context, bool syscall, uin
 		sigset = &thread->signals.urgent;
 	}
 
-	for (int i = 0; i < NSIG && sigset == NULL; ++i) {
+	for (int i = 1; i < NSIG && sigset == NULL; ++i) {
 		if (SIGNAL_GET(&thread->signals.mask, i))
 			continue;
 
@@ -397,7 +397,7 @@ bool signal_check(struct thread_t *thread, context_t *context, bool syscall, uin
 		if ((action->flags & SA_NODEFER) == 0)
 			SIGNAL_SETON(&thread->signals.mask, signal);
 
-		for (int i = 0; i < signal; ++i) {
+		for (int i = 1; i < signal; ++i) {
 			if (SIGNAL_GET(&action->mask, i) == 0)
 				continue;
 
diff --git a/kernel-src/sys/syscalls/kill.c b/kernel-src/sys/syscalls/kill.c
index c722895d..751d3abf 100644
--- a/kernel-src/sys/syscalls/kill.c
+++ b/kernel-src/sys/syscalls/kill.c
@@ -31,7 +31,7 @@ syscallret_t syscall_kill(context_t *context, int pid, int signal) {
 		goto leave;
 
 	if (pid >= 1) {
-		if (signal != SIGCONT && jobctl_getpgid(target) != jobctl_getpgid(_cpu()->thread->proc)) {
+		if (signal != SIGCONT || jobctl_getpgid(target) != jobctl_getpgid(_cpu()->thread->proc)) {
 			ret.errno = auth_process_check(&_cpu()->thread->proc->cred, AUTH_ACTIONS_PROCESS_SIGNAL, target);
 			if (ret.errno)
 				goto leave;