kernel/svc: Sanitize heap sizes within svcSetHeapSize()

The kernel checks if the given size is a multiple of 2MB and <= to 4GB
before going ahead and attempting to allocate that much memory.

src/core/hle/kernel/errors.h

@@ -17,6 +17,7 @@ enum {
 
     // Confirmed Switch OS error codes
     MaxConnectionsReached = 7,
+    InvalidSize = 101,
     InvalidAddress = 102,
     HandleTableFull = 105,
     InvalidMemoryState = 106,
@@ -55,6 +56,7 @@ constexpr ResultCode ERR_INVALID_MEMORY_PERMISSIONS(ErrorModule::Kernel,
                                                     ErrCodes::InvalidMemoryPermissions);
 constexpr ResultCode ERR_INVALID_HANDLE(ErrorModule::Kernel, ErrCodes::InvalidHandle);
 constexpr ResultCode ERR_INVALID_PROCESSOR_ID(ErrorModule::Kernel, ErrCodes::InvalidProcessorId);
+constexpr ResultCode ERR_INVALID_SIZE(ErrorModule::Kernel, ErrCodes::InvalidSize);
 constexpr ResultCode ERR_INVALID_STATE(ErrorModule::Kernel, ErrCodes::InvalidState);
 constexpr ResultCode ERR_INVALID_THREAD_PRIORITY(ErrorModule::Kernel,
                                                  ErrCodes::InvalidThreadPriority);

src/core/hle/kernel/svc.cpp

@@ -39,6 +39,12 @@ namespace Kernel {
 /// Set the process heap to a given Size. It can both extend and shrink the heap.
 static ResultCode SetHeapSize(VAddr* heap_addr, u64 heap_size) {
     LOG_TRACE(Kernel_SVC, "called, heap_size=0x{:X}", heap_size);
+
+    // Size must be a multiple of 0x200000 (2MB) and be equal to or less than 4GB.
+    if ((heap_size & 0xFFFFFFFE001FFFFF) != 0) {
+        return ERR_INVALID_SIZE;
+    }
+
     auto& process = *Core::CurrentProcess();
     CASCADE_RESULT(*heap_addr,
                    process.HeapAllocate(Memory::HEAP_VADDR, heap_size, VMAPermission::ReadWrite));