Created
February 21, 2019 13:37
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Executes a binary or file in memory on a Linux system. Uses the memfd_create(2) syscall. Credits and idea from: https://magisterquis.github.io/2018/03/31/in-memory-only-elf-execution.html
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| package main | |
| import ( | |
| "io/ioutil" | |
| "os" | |
| "os/exec" | |
| "strconv" | |
| "syscall" | |
| "unsafe" | |
| ) | |
| func main() { | |
| newFdName := "test_fd" | |
| fdName, err := syscall.BytePtrFromString(newFdName) | |
| if err != nil { | |
| panic(err) | |
| } | |
| fd, _, _ := syscall.Syscall(319, uintptr(unsafe.Pointer(fdName)), 1, 0) | |
| pid := os.Getpid() | |
| file, err := ioutil.ReadFile("/home/capnspacehook/test.bin") | |
| if err != nil { | |
| panic(err) | |
| } | |
| fdPath := "/proc/" + strconv.Itoa(pid) + "/fd/" + strconv.Itoa(int(fd)) | |
| err = ioutil.WriteFile(fdPath, file, 0755) | |
| if err != nil { | |
| panic(err) | |
| } | |
| println(fdPath) | |
| fdCmd := exec.Command(fdPath) | |
| fdCmd.Stdout = os.Stdout | |
| fdCmd.Stderr = os.Stderr | |
| err = fdCmd.Run() | |
| if err != nil { | |
| panic(err) | |
| } | |
| } |
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