SELinux compatibility: memalign -> mmap

amxmodx/modules.cpp

@@ -300,10 +300,10 @@ int load_amxscript(AMX *amx, void **program, const char *filename, char error[64
 #elif defined(__GNUC__)
 # if defined(__APPLE__)
 			amx->base = (unsigned char *)valloc(amx->code_size);
-# else
-			amx->base = (unsigned char *)memalign(sysconf(_SC_PAGESIZE), amx->code_size);
-# endif
 			mprotect((void *)amx->base, amx->code_size, PROT_READ | PROT_WRITE | PROT_EXEC);
+# else
+			amx->base = (unsigned char *)mmap(nullptr, amx->code_size, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+# endif
 #endif
 			if (amx->base)
 				memcpy(amx->base, np, amx->code_size);
@@ -562,6 +562,7 @@ int unload_amxscript(AMX* amx, void** program)
 {	
 #if defined JIT
 	int flags = amx->flags;
+	long code_size = amx->code_size;
 #endif
 
 	Debugger *pDebugger = (Debugger *)amx->userdata[UD_DEBUGGER];
@@ -592,12 +593,16 @@ int unload_amxscript(AMX* amx, void** program)
 	{
 		delete [] prg;
 	} else {
+#ifdef __linux__
+		munmap(prg, code_size);
+#else
 #ifdef free
 #undef free
 		free(prg);
 #define free(ptr)	m_deallocator(__FILE__, __LINE__, __FUNCTION__, m_alloc_free, ptr)
 #else
 		free(prg);
+#endif
 #endif
 	}
 #elif defined WIN32

amxmodx/natives.cpp

@@ -468,10 +468,10 @@ static cell AMX_NATIVE_CALL register_native(AMX *amx, cell *params)
 #elif defined(__GNUC__)
 # if defined(__APPLE__)
 	pNative->pfn = (char *)valloc(size+10);
-# else
-	pNative->pfn = (char *)memalign(sysconf(_SC_PAGESIZE), size+10);
-# endif
 	mprotect((void *)pNative->pfn, size + 10, PROT_READ | PROT_WRITE | PROT_EXEC);
+# else
+	pNative->pfn = (char *)mmap(nullptr, size + 10, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+# endif
 #endif
 
 	int id = (int)g_RegNatives.length();
@@ -492,7 +492,11 @@ void ClearPluginLibraries()
 	ClearLibraries(LibSource_Plugin);
 	for (size_t i=0; i<g_RegNatives.length(); i++)
 	{
+#ifdef __linux__
+		munmap(g_RegNatives[i]->pfn, amxx_DynaCodesize() + 10);
+#else
 		delete [] g_RegNatives[i]->pfn;
+#endif
 		delete g_RegNatives[i];
 	}
 	g_RegNatives.clear();

modules/hamsandwich/Trampolines.h

@@ -562,10 +562,10 @@ namespace Trampolines
 #elif defined(__GNUC__)
 # if defined(__APPLE__)
 			void *ret = valloc(m_size);
-# else
-			void *ret=memalign(sysconf(_SC_PAGESIZE), m_size);
-# endif
 			mprotect(ret,m_size,PROT_READ|PROT_WRITE|PROT_EXEC);
+# else
+			void *ret=mmap(nullptr, m_size, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+# endif
 #endif
 			memcpy(ret, m_buffer, m_size);
 
@@ -588,7 +588,7 @@ namespace Trampolines
 /**
  * Utility to make a generic trampoline.
  */
-inline void *CreateGenericTrampoline(bool thiscall, bool voidcall, bool retbuf, int paramcount, void *extraptr, void *callee)
+inline void *CreateGenericTrampoline(bool thiscall, bool voidcall, bool retbuf, int paramcount, void *extraptr, void *callee, int *size)
 {
 	Trampolines::TrampolineMaker tramp;
 
@@ -628,7 +628,7 @@ inline void *CreateGenericTrampoline(bool thiscall, bool voidcall, bool retbuf,
 	}
 #endif
 
-	return tramp.Finish(NULL);
+	return tramp.Finish(size);
 };
 
 

modules/hamsandwich/hook.h

@@ -37,9 +37,10 @@ public:
 	int              del;     // 1 if this hook should be destroyed after exec
 	void            *tramp;   // trampoline for this hook
 	char			*ent;     // ent name that's being hooked
+	int              trampSize;
 
 	Hook(void **vtable_, int entry_, void *target_, bool voidcall, bool retbuf, int paramcount, char *name) :
-		func(NULL), vtable(vtable_), entry(entry_), target(target_), exec(0), del(0), tramp(NULL)
+		func(NULL), vtable(vtable_), entry(entry_), target(target_), exec(0), del(0), tramp(NULL), trampSize(0)
 		{
 			// original function is vtable[entry]
 			// to not make the compiler whine, cast vtable to int **
@@ -48,7 +49,7 @@ public:
 
 			// now install a trampoline
 			// (int thiscall, int voidcall, int paramcount, void *extraptr)
-			tramp = CreateGenericTrampoline(true, voidcall, retbuf, paramcount, (void*)this, target);
+			tramp = CreateGenericTrampoline(true, voidcall, retbuf, paramcount, (void*)this, target, &trampSize);
 
 			// Insert into vtable
 #if defined(_WIN32)
@@ -82,7 +83,9 @@ public:
 		ivtable[entry]=(int *)func;
 #if defined(_WIN32)
 		VirtualFree(tramp, 0, MEM_RELEASE);
-#elif defined(__linux__) || defined(__APPLE__)
+#elif defined(__linux__)
+		munmap(tramp, trampSize);
+#elif defined(__APPLE__)
 		free(tramp);
 #endif
 

public/memtools/CDetour/detourhelpers.h

@@ -77,18 +77,20 @@ inline unsigned char *AllocatePageMemory(size_t size)
 #elif defined __GNUC__
 #if defined __APPLE__
 	unsigned char *addr = (unsigned char *)valloc(size);
-#else
-	unsigned char *addr = (unsigned char *)memalign(sysconf(_SC_PAGESIZE), size);
-#endif
 	mprotect(addr, size, PROT_READ | PROT_WRITE | PROT_EXEC);
+#else
+	unsigned char *addr = (unsigned char *)mmap(nullptr, size, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+#endif
 	return addr;
 #endif
 }
 
-inline void FreePageMemory(void *addr)
+inline void FreePageMemory(void *addr, size_t size)
 {
 #if defined(WIN32)
 	VirtualFree(addr, 0, MEM_RELEASE);
+#elif defined(__linux__)
+	munmap(addr, size);
 #else
 	free(addr);
 #endif

public/memtools/CDetour/detours.cpp

@@ -186,6 +186,7 @@ jit_rewind:
 		//spengine->SetReadWrite(wr.outbase);
 		wr.outptr = wr.outbase;
 		detour_trampoline = wr.outbase;
+		detour_trampolineSize = CodeSize;
 		goto jit_rewind;
 	}
 
@@ -206,7 +207,7 @@ void CDetour::DeleteDetour()
 	if (detour_trampoline)
 	{
 		/* Free the allocated trampoline memory */
-		FreePageMemory(detour_trampoline);
+		FreePageMemory(detour_trampoline, detour_trampolineSize);
 		detour_trampoline = NULL;
 	}
 }

public/memtools/CDetour/detours.h

@@ -199,6 +199,7 @@ private:
 	void *detour_address;
 	/* Address of the allocated trampoline function */
 	void *detour_trampoline;
+	size_t detour_trampolineSize;
 	/* Address of the callback handler */
 	void *detour_callback;
 	/* The function pointer used to call our trampoline */