diff --git a/Core/HLE/sceKernelEventFlag.cpp b/Core/HLE/sceKernelEventFlag.cpp
index 20d9be09bd..c1a9de550f 100644
--- a/Core/HLE/sceKernelEventFlag.cpp
+++ b/Core/HLE/sceKernelEventFlag.cpp
@@ -103,17 +103,37 @@ int sceKernelCreateEventFlag(const char *name, u32 flag_attr, u32 flag_initPatte
 	if (!eventFlagInitComplete)
 		__KernelEventFlagInit();
 
+	if (!name)
+	{
+		WARN_LOG(HLE, "%08x=sceKernelCreateEventFlag(): invalid name", SCE_KERNEL_ERROR_ERROR);
+		return SCE_KERNEL_ERROR_ERROR;
+	}
+
+	// These attributes aren't valid.
+	if ((flag_attr & 0x100) != 0 || flag_attr >= 0x300)
+	{
+		WARN_LOG(HLE, "%08x=sceKernelCreateEventFlag(): invalid attr parameter: %08x", SCE_KERNEL_ERROR_ILLEGAL_ATTR, flag_attr);
+		return SCE_KERNEL_ERROR_ILLEGAL_ATTR;
+	}
+
 	EventFlag *e = new EventFlag();
 	SceUID id = kernelObjects.Create(e);
 
 	e->nef.size = sizeof(NativeEventFlag);
-	strncpy(e->nef.name, name, 32);
+	strncpy(e->nef.name, name, 31);
+	e->nef.name[31] = 0;
 	e->nef.attr = flag_attr;
 	e->nef.initPattern = flag_initPattern;
 	e->nef.currentPattern = e->nef.initPattern;
 	e->nef.numWaitThreads = 0;
 
-	DEBUG_LOG(HLE,"%i=sceKernelCreateEventFlag(\"%s\", %08x, %08x, %08x)", id, e->nef.name, e->nef.attr, e->nef.currentPattern, optPtr);
+	DEBUG_LOG(HLE, "%i=sceKernelCreateEventFlag(\"%s\", %08x, %08x, %08x)", id, e->nef.name, e->nef.attr, e->nef.currentPattern, optPtr);
+
+	if (optPtr != 0)
+		WARN_LOG(HLE, "sceKernelCreateEventFlag(%s) unsupported options parameter: %08x", name, optPtr);
+	if (flag_attr != 0 && flag_attr != 0x200)
+		WARN_LOG(HLE, "sceKernelCreateEventFlag(%s) unsupported attr parameter: %08x", name, flag_attr);
+
 	return id;
 }
 
diff --git a/Core/HLE/sceKernelMutex.cpp b/Core/HLE/sceKernelMutex.cpp
index 337d41e427..4f931b160c 100644
--- a/Core/HLE/sceKernelMutex.cpp
+++ b/Core/HLE/sceKernelMutex.cpp
@@ -187,14 +187,21 @@ int sceKernelCreateMutex(const char *name, u32 attr, int initialCount, u32 optio
 		__KernelMutexInit();
 
 	if (!name)
+	{
+		WARN_LOG(HLE, "%08x=sceKernelCreateMutex(): invalid name", SCE_KERNEL_ERROR_ERROR);
 		return SCE_KERNEL_ERROR_ERROR;
+	}
+	if (attr >= 0xC00)
+	{
+		WARN_LOG(HLE, "%08x=sceKernelCreateMutex(): invalid attr parameter: %08x", SCE_KERNEL_ERROR_ILLEGAL_ATTR, attr);
+		return SCE_KERNEL_ERROR_ILLEGAL_ATTR;
+	}
+
 	if (initialCount < 0)
 		return SCE_KERNEL_ERROR_ILLEGAL_COUNT;
 	if ((attr & PSP_MUTEX_ATTR_ALLOW_RECURSIVE) == 0 && initialCount > 1)
 		return SCE_KERNEL_ERROR_ILLEGAL_COUNT;
 
-	DEBUG_LOG(HLE, "sceKernelCreateMutex(%s, %08x, %d, %08x)", name, attr, initialCount, optionsPtr);
-
 	Mutex *mutex = new Mutex();
 	SceUID id = kernelObjects.Create(mutex);
 
@@ -210,8 +217,12 @@ int sceKernelCreateMutex(const char *name, u32 attr, int initialCount, u32 optio
 	else
 		__KernelMutexAcquireLock(mutex, initialCount);
 
+	DEBUG_LOG(HLE, "%i=sceKernelCreateMutex(%s, %08x, %d, %08x)", id, name, attr, initialCount, optionsPtr);
+
 	if (optionsPtr != 0)
-		WARN_LOG(HLE, "sceKernelCreateMutex(%s) unsupported options parameter.", name);
+		WARN_LOG(HLE, "sceKernelCreateMutex(%s) unsupported options parameter: %08x", name, optionsPtr);
+	if (attr != 0 && attr != 0x100 && attr != 0x200)
+		WARN_LOG(HLE, "sceKernelCreateMutex(%s) unsupported attr parameter: %08x", name, attr);
 
 	return id;
 }
@@ -486,13 +497,20 @@ int sceKernelCreateLwMutex(u32 workareaPtr, const char *name, u32 attr, int init
 	if (!mutexInitComplete)
 		__KernelMutexInit();
 
-	DEBUG_LOG(HLE, "sceKernelCreateLwMutex(%08x, %s, %08x, %d, %08x)", workareaPtr, name, attr, initialCount, optionsPtr);
-
 	if (!name)
+	{
+		WARN_LOG(HLE, "%08x=sceKernelCreateLwMutex(): invalid name", SCE_KERNEL_ERROR_ERROR);
 		return SCE_KERNEL_ERROR_ERROR;
-	else if (initialCount < 0)
+	}
+	if (attr >= 0x400)
+	{
+		WARN_LOG(HLE, "%08x=sceKernelCreateLwMutex(): invalid attr parameter: %08x", SCE_KERNEL_ERROR_ILLEGAL_ATTR, attr);
+		return SCE_KERNEL_ERROR_ILLEGAL_ATTR;
+	}
+
+	if (initialCount < 0)
 		return SCE_KERNEL_ERROR_ILLEGAL_COUNT;
-	else if ((attr & PSP_MUTEX_ATTR_ALLOW_RECURSIVE) == 0 && initialCount > 1)
+	if ((attr & PSP_MUTEX_ATTR_ALLOW_RECURSIVE) == 0 && initialCount > 1)
 		return SCE_KERNEL_ERROR_ILLEGAL_COUNT;
 
 	LwMutex *mutex = new LwMutex();
@@ -515,8 +533,12 @@ int sceKernelCreateLwMutex(u32 workareaPtr, const char *name, u32 attr, int init
 
 	Memory::WriteStruct(workareaPtr, &workarea);
 
+	DEBUG_LOG(HLE, "sceKernelCreateLwMutex(%08x, %s, %08x, %d, %08x)", workareaPtr, name, attr, initialCount, optionsPtr);
+
 	if (optionsPtr != 0)
-		WARN_LOG(HLE, "sceKernelCreateLwMutex(%s) unsupported options parameter.", name);
+		WARN_LOG(HLE, "sceKernelCreateLwMutex(%s) unsupported options parameter: %08x", name, optionsPtr);
+	if (attr != 0 && attr != 0x100 && attr != 0x200)
+		WARN_LOG(HLE, "sceKernelCreateLwMutex(%s) unsupported attr parameter: %08x", name, attr);
 
 	return 0;
 }
diff --git a/Core/HLE/sceKernelSemaphore.cpp b/Core/HLE/sceKernelSemaphore.cpp
index c4b103f007..0753420051 100644
--- a/Core/HLE/sceKernelSemaphore.cpp
+++ b/Core/HLE/sceKernelSemaphore.cpp
@@ -177,7 +177,15 @@ int sceKernelCreateSema(const char* name, u32 attr, int initVal, int maxVal, u32
 		__KernelSemaInit();
 
 	if (!name)
+	{
+		WARN_LOG(HLE, "%08x=sceKernelCreateSema(): invalid name", SCE_KERNEL_ERROR_ERROR);
 		return SCE_KERNEL_ERROR_ERROR;
+	}
+	if (attr >= 0x200)
+	{
+		WARN_LOG(HLE, "%08x=sceKernelCreateSema(): invalid attr parameter: %08x", SCE_KERNEL_ERROR_ILLEGAL_ATTR, attr);
+		return SCE_KERNEL_ERROR_ILLEGAL_ATTR;
+	}
 
 	Semaphore *s = new Semaphore;
 	SceUID id = kernelObjects.Create(s);
@@ -194,7 +202,9 @@ int sceKernelCreateSema(const char* name, u32 attr, int initVal, int maxVal, u32
 	DEBUG_LOG(HLE, "%i=sceKernelCreateSema(%s, %08x, %i, %i, %08x)", id, s->ns.name, s->ns.attr, s->ns.initCount, s->ns.maxCount, optionPtr);
 
 	if (optionPtr != 0)
-		WARN_LOG(HLE, "sceKernelCreateSema(%s) unsupported options parameter.", name);
+		WARN_LOG(HLE, "sceKernelCreateSema(%s) unsupported options parameter: %08x", name, optionPtr);
+	if (attr != 0 && attr != 0x100)
+		WARN_LOG(HLE, "sceKernelCreateSema(%s) unsupported attr parameter: %08x", name, attr);
 
 	return id;
 }