github.com/agiledragon/gomonkey/v2@v2.11.1-0.20240427155748-d56c6823ec17/modify_binary_windows.go (about)

     1  package gomonkey
     2  
     3  import (
     4      "syscall"
     5      "unsafe"
     6  )
     7  
     8  func modifyBinary(target uintptr, bytes []byte) {
     9      function := entryAddress(target, len(bytes))
    10      
    11      proc := syscall.NewLazyDLL("kernel32.dll").NewProc("VirtualProtect")
    12      const PROT_READ_WRITE = 0x40
    13      var old uint32
    14      result, _, _ := proc.Call(target, uintptr(len(bytes)), uintptr(PROT_READ_WRITE), uintptr(unsafe.Pointer(&old)))
    15      if result == 0 {
    16          panic(result)
    17      }
    18      copy(function, bytes)
    19      
    20      var ignore uint32
    21      result, _, _ = proc.Call(target, uintptr(len(bytes)), uintptr(old), uintptr(unsafe.Pointer(&ignore)))
    22      if result == 0 {
    23          panic(result)
    24      }
    25  }