17cb68e9fb
Symbolic links might point to files outside of the chroot and thus might delete files outside the chroot. This allows deletion of arbitrary directories on the host from a malicious APKBUILD. Following hard links shouldn't be a problem since hard links (usually) cannot refer to directories and since remove(3) removes the link, not the file it points to it shouldn't cause a problem. I noticed this because alpine-baselayout creates /var/run as a symlink to /run. Therefore causing /run to be deleted on the host when using abuild-rmtemp which in turn causes a bunch of software to no longer function properly (including OpenRC).