A mexec/mexec.go

@@ -0,0 +1,68 @@ 
+package mexec
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"os/exec"
+	"syscall"
+	"unsafe"
+)
+
+type Bin struct {
+	Data *[]byte
+	Fd   *os.File
+}
+
+func (b *Bin) Close() error {
+	if b.Fd != nil {
+		err := b.Fd.Close()
+		b.Fd = nil
+		return err
+	}
+	return nil
+}
+
+func (b *Bin) Open() error {
+	err := b.Close()
+	if err != nil {
+		return err
+	}
+	a := make([]byte, 1)
+	r, _, e := syscall.Syscall(319, uintptr(unsafe.Pointer(&a[0])), uintptr(0x1), 0)
+	if e != 0 {
+		return errors.New("memfd_create failed")
+	}
+	b.Fd = os.NewFile(r, fmt.Sprintf("/proc/%d/fd/%d", os.Getpid(), int(r)))
+	if _, err = b.Fd.Write(*b.Data); err != nil {
+		_ = b.Fd.Close()
+		return err
+	}
+	return nil
+}
+
+func (b *Bin) Command(args ...string) *exec.Cmd {
+	return exec.Command(b.Fd.Name(), args...)
+}
+
+func NewBin(data *[]byte) (*Bin, error) {
+	if len(*data) == 0 {
+		return nil, errors.New("binary data is empty")
+	}
+	bin := &Bin{Data: data}
+	if err := bin.Open(); err != nil {
+		return nil, err
+	}
+	return bin, nil
+}
+
+func OpenBin(file string) (*Bin, error) {
+	b, err := os.ReadFile(file)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read binary file %s: %w", file, err)
+	}
+	if len(b) == 0 {
+		return nil, errors.New("binary file is empty")
+	}
+	return NewBin(&b)
+}