Hi, In case you don't know, opentmpfiles has an open CVE CVE-2017-18925: root privilege escalation by symlink attack https://github.com/OpenRC/opentmpfiles/issues/4 It has been an issue for quite a while, reported 3 years ago, and not much changed since. Also it lacks any sort of testing, and master branch is in a non-working state at time of writing, latest version is masked.
Due to nature of opentmpfiles (it's a POSIX sh script), it may be impossible to fix symlink handling and TOCTOU races. As a consequence I'll be switching default tmpfiles provider to sys-apps/systemd-tmpfiles by the end of the week by updating virtual/tmpfiles ebuild. pros of systemd-tmpfiles: 0) Secure. 1) Reference implementation. 2) Supports all features, because ^. 3) Has working tests. 4) Has millions of users as part of systemd. 5) upstream supports standalone usecase/build our ebuild uses.  6) drop-in replacement, just emerge and forget. systemd-tmpfiles does not depend on any systemd-isms, does not need dbus, and is just a drop-in replacement, the only step needed is to emerge the package. it's a simple single binary + manpage, binary links to libacl and couple other system libs. existing installations will not be affected, but openrc users are welcome to opt-in by running 'emerge --oneshot systemd-tmpfiles'  https://bugs.gentoo.org/751739  https://github.com/systemd/systemd/pull/16061  https://github.com/systemd/systemd/pull/16061/commits/db64ba81c62afa0e0d3e95c4a3e1ec3dd9a471a4
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