overlayfs-etc: Unmount /sys and /proc before init

/sys filesystem mounted by the preinit script causes shadowing of
/sys/firmware/efi/ by double /sys mounting on systemd enabled systems
[1]. As the result EFI tooling is broken

[1]
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
efivarfs on /sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
sysfs on /sys type sysfs (rw,relatime)

Signed-off-by: Pavel Zhukov <pavel@zhukoff.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/meta/files/overlayfs-etc-preinit.sh.in b/meta/files/overlayfs-etc-preinit.sh.in
index b05e3957a38252b73e57bb2447a6d0f3b5b60b0c..973887649af090a32d3b3864406c01a8cc3d8674 100644 (file)
--- a/meta/files/overlayfs-etc-preinit.sh.in
+++ b/meta/files/overlayfs-etc-preinit.sh.in
@@ -48,5 +48,8 @@ else
     echo "PREINIT: Mounting </data> failed!"
 fi
 
+umount /sys
+umount /proc
+
 echo "PREINIT: done; starting </sbin/init>"
 exec {SBIN_INIT_NAME}