![]() ![]() An application can get the current policy setting by calling the GetSystemDEPPolicy function. Heap allocations made by calling the malloc and HeapAlloc functions are non-executable.Īpplications cannot run code from the default process heap or the stack.ĭEP is configured at system boot according to the no-execute page protection policy setting in the boot configuration data. The allocated memory must be marked PAGE_EXECUTE, PAGE_EXECUTE_READ, PAGE_EXECUTE_READWRITE, or PAGE_EXECUTE_WRITECOPY when allocating memory. If your application must run code from a memory page, it must allocate and set the proper virtual memory protection attributes. If an application attempts to run code from a protected page, the application receives an exception with the status code STATUS_ACCESS_VIOLATION. If an application attempts to run code from a data page that is protected, a memory access violation exception occurs, and if the exception is not handled, the calling process is terminated.ĭEP is not intended to be a comprehensive defense against all exploits it is intended to be another tool that you can use to secure your application. Marking memory regions as non-executable means that code cannot be run from that region of memory, which makes it harder for the exploitation of buffer overruns.ĭEP prevents code from being run from data pages such as the default heap, stacks, and memory pools. DEP enables the system to mark one or more pages of memory as non-executable. Data Execution Prevention (DEP) is a system-level memory protection feature that is built into the operating system starting with Windows XP and Windows Server 2003.
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