This is a workaround to make IPAddressDeny=any/IPAddressAllow=any work
for non-root users that have CAP_NET_ADMIN. "any" was chosen since
all or nothing network access is one of the most common use cases for
isolation.
Allocating BPF LPM TRIE maps require CAP_SYS_ADMIN while BPF_PROG_TYPE_CGROUP_SKB
only needs CAP_NET_ADMIN. In the case of IPAddressXYZ="any" we can just
consistently return false/true to avoid allocating the map and limit the user
to having CAP_NET_ADMIN.
It's possible for a zombie process to have live threads. These are not listed
in /sys in "cgroup.procs" for cgroupsv2, but they show up in
"cgroup.threads" (cgroupv2) or "tasks" (cgroupv1) nodes. When killing a
cgroup (v2 only) with SIGKILL, let's also kill threads after killing processes,
so the live threads of a zombie get killed too.
Closes#12262.
prefix_root() is equivalent to path_join() in almost all ways, hence
let's remove it.
There are subtle differences though: prefix_root() will try shorten
multiple "/" before and after the prefix. path_join() doesn't do that.
This means prefix_root() might return a string shorter than both its
inputs combined, while path_join() never does that. I like the
path_join() semantics better, hence I think dropping prefix_root() is
totally OK. In the end the strings generated by both functon should
always be identical in terms of path_equal() if not streq().
This leaves prefix_roota() in place. Ideally we'd have path_joina(), but
I don't think we can reasonably implement that as a macro. or maybe we
can? (if so, sounds like something for a later PR)
Also add in a few missing OOM checks
The OCI changes in #9762 broke a use case in which we use nspawn from
inside a container that has dropped capabilities from the bounding set
that nspawn expected to retain. In an attempt to keep OCI compliance
and support our use case, I made hard failing on setting capabilities
not in the bounding set optional (hard fail if using OCI and log only
if using nspawn cmdline).
Fixes#12539
cap_last_cap() returns the last valid cap (instead of the number of
valid caps). to iterate through all known caps we hence need to use a <=
check, and not a < check like for all other cases. We got this right
usually, but in three cases we did not.
While the need for access to character devices can be tricky to determine for
the general case, it's obvious that most of our services have no need to access
block devices. For logind and timedated this can be tightened further.
When part of the cgroup hierarchy cannot be deleted (e.g. because there
are still processes in it), do not exit unit_prune_cgroup early, but
continue so that u->cgroup_realized is reset.
Log the known case of non-empty cgroups at debug level and other errors
at warning level.
Fixes https://github.com/systemd/systemd/issues/12386
Instead of having a context and/or trusted CA list per server this is now moved to the server. Ensures future TLS configuration options are global instead of per server.
Lennart Poettering