Method vmWriteBytes

cmd/run/engine/process/vm.go:169–199

vmWriteBytes writes b to the process's memory starting at ptr. It returns an error if the address range isn't writable or if the notification is invalid.

(n *seccomp.Notif, ptr uintptr, b []byte)

// vmWriteBytes writes b to the process's memory starting at ptr. It returns an
// error if the address range isn't writable or if the notification is invalid.
func (p *Process) vmWriteBytes(n *seccomp.Notif, ptr uintptr, b []byte) (syscall.Errno, error) {
	if !n.Valid() {
		return 0, seccomp.ErrCancelled
	}

	if len(b) == 0 {
		return 0, nil
	}
	if ptr == 0 {
		return unix.EINVAL, nil
	}

	wrote, err := writeMemory(int(p.PID), b, ptr)
	if err != nil {
		if !n.Valid() {
			return 0, seccomp.ErrCancelled
		}
		var errno syscall.Errno
		if errors.As(err, &errno) {
			return errno, nil
		}
		return 0, fmt.Errorf("memory write: unknown error: %w", err)
	}
	if wrote < len(b) {
		if !n.Valid() {
			return 0, seccomp.ErrCancelled
		}
		return 0, fmt.Errorf("memory write: partial write: wrote %d, expected %d", wrote, len(b))
	}
	return 0, nil
}

// vmWriteInt32 writes a uint32 to the process' memory at ptr.
func (p *Process) vmWriteUint32(n *seccomp.Notif, ptr uintptr, val uint32) (syscall.Errno, error) {