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When trying to run dbus-broker in a systemd unit with PrivateUsers=full,
we see dbus-broker fails with EPERM at `util_audit_drop_permissions`.
The root cause is dbus-broker calls the setgroups() system call and this
is disallowed via systemd's implementation of PrivateUsers= by setting
/proc/pid/setgroups = deny. This is done to remediate potential privilege
escalation vulnerabilities in user namespaces where an attacker can remove
supplementary groups and gain access to resources where those groups are
restricted.
However, for OS-like containers, setgroups() is a pretty common API and
disabling it is not feasible. So we allow setgroups() by setting
/proc/pid/setgroups to allow in PrivateUsers=full. Note security conscious
users can still use SystemCallFilter= to disable setgroups() if they want
to specifically prevent this system call.
Fixes: #35425
semaphore CI runs are always very close to the limit of 1hr, and often
time out when it's particularly oversubscribed.
Skip some low-value test cases to shorten the runtime.
This function was listed in the public sd-varlink.h header, but not
actually made public. Fix that. It's quite useful, the comment in it
describes the usecase nicely.
Fixes: #35554
This way, users don't have to check those features using an external
program, or wait for later failure when trying to enroll using an
unsupported feature.
E.g.:
```
# systemd-cryptenroll --fido2-device list
PATH MANUFACTURER PRODUCT RK CLIENTPIN UP UV
/dev/hidraw2 Yubico YubiKey OTP+FIDO+CCID yes no yes no
```
This introduces a new unit condition check: that matches if a specific
kmod module is allowed. This should be generally useful, but there's one
usecase in particular: we can optimize modprobe@.service with this and
avoid forking out a bunch of modprobe requests during boot for the same
kmods.
Checking if a kernel module is loaded is more complicated than just
checking if /sys/module/$MODULE/ exists, since kernel modules typically
take a while to initialize and we must check that this is complete (by
checking if the sysfs attr "initstate" is "live").
