What does VirtualAllocEx do?
The VirtualAllocEx function can be used to reserve an Address Windowing Extensions (AWE) region of memory within the virtual address space of a specified process. This region of memory can then be used to map physical pages into and out of virtual memory as required by the application.
Does malloc use VirtualAlloc?
new in C++, malloc for C, VirtualAlloc for massive or IPC cases. *** Note, large memory allocations done by HeapAlloc are actually shipped off to VirtualAlloc after some size (couple hundred k or 16 MB or something I forget, but fairly big 🙂 ).
What is Createremotethreadex?
The CreateRemoteThread function causes a new thread of execution to begin in the address space of the specified process. The thread has access to all objects that the process opens. Prior to Windows 8, Terminal Services isolates each terminal session by design.
What is a Hmodule?
HMODULE. A handle to a module. The is the base address of the module in memory. HMODULE and HINSTANCE are the same in current versions of Windows, but represented different things in 16-bit Windows.
How does process hollowing work?
Process hollowing is a security exploit in which an attacker removes code in an executable file and replaces it with malicious code. The process hollowing attack is used by hackers to cause an otherwise legitimate process to execute malicious code.
What is DWORD C#?
DWORD is defined as unsigned long , which ends up being a 32-bit unsigned integer.
What is Pdword?
PDWORD is defined as a pointer to a DWORD, thereby in Delphi it should be PDWORD = ^DWORD. It’s DWORD_PTR (which is not a PDWORD!) that is defined as an ULONG_PTR, and the latter changes in size depending on the platform – Win32 or Win64 – not the compiler defintiion of un unsigned long.
What is the use of virtualallocex function?
The VirtualAllocEx function can be used to reserve an Address Windowing Extensions (AWE) region of memory within the virtual address space of a specified process. This region of memory can then be used to map physical pages into and out of virtual memory as required by the application.
How do I reserve space in virtualallocex?
You can use VirtualAllocEx to reserve a block of pages and then make additional calls to VirtualAllocEx to commit individual pages from the reserved block. This enables a process to reserve a range of its virtual address space without consuming physical storage until it is needed.
Can virtualallocex commit a page that is already committed?
The VirtualAllocEx function can perform the following operations: VirtualAllocEx cannot reserve a reserved page. It can commit a page that is already committed. This means you can commit a range of pages, regardless of whether they have already been committed, and the function will not fail.
Does virtualallocexnuma allocate pages on demand?
Because VirtualAllocExNuma does not allocate any physical pages, it will succeed whether or not the pages are available on that node or elsewhere in the system. The physical pages are allocated on demand. If the preferred node runs out of pages, the memory manager will use pages from other nodes.