fix up sudo issue for loongarch-lab

The newer qemu requires additional OCF flags to let users switch to
root, let's apply such flags.

ref: multiarch/qemu-user-static#17

Signed-off-by: Wu Zhangjin <falcon@tinylab.org>

configs/loongarch-lab/tools/host-run

@@ -5,5 +5,9 @@
 if [ ! -f /proc/sys/fs/binfmt_misc/register -o ! -f /proc/sys/fs/binfmt_misc/qemu-loongarch64 ]; then
   # multiarch/qemu-user-static doesn't support loongarch64 yet
   # docker run --rm --privileged multiarch/qemu-user-static --reset -p yes --credential yes >/dev/null
-  sudo sh -c "echo ':qemu-loongarch64:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x02\x01:\xff\xff\xff\xff\xff\xff\xff\xfc\x00\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-loongarch64:' > /proc/sys/fs/binfmt_misc/register"
+
+  # ref: https://github.com/multiarch/qemu-user-static/issues/17
+  # FIXME: sudo: effective uid is not 0, is /usr/bin/sudo on a file system with the 'nosuid' option set or an NFS file system without root privileges
+  flags="OCF"
+  sudo sh -c "echo ':qemu-loongarch64:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x02\x01:\xff\xff\xff\xff\xff\xff\xff\xfc\x00\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-loongarch64:$flags' > /proc/sys/fs/binfmt_misc/register"
 fi