minijail: Allow tmpfs /tmp mount without a chroot.
There's no need to require a chroot to mount a clean tmpfs /tmp.
Also, halve the size of the tmpfs to 64M.
BUG=brillo:439
TEST=Unit tests, security_Minijail pass.
TEST='minijail0 -u nobody -g nobody -t -- mount' shows tmpfs mount.
Change-Id: Iee84160cee0487a0e7e0807b64ba54f6b3980e83
Reviewed-on: https://chromium-review.googlesource.com/255650
Commit-Queue: Jorge Lucangeli Obes <jorgelo@chromium.org>
Trybot-Ready: Jorge Lucangeli Obes <jorgelo@chromium.org>
Tested-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Lee Campbell <leecam@chromium.org>
2 files changed