There is logic to determine the UID shift from the file-system, rather
than having it be explicitly passed in.
However, this needs to happen in the child process that sets up the
mounts, as what's important is the UID of the mounted root, rather than
the mount-point.
Setting up the UID map needs to happen in the parent becuase the inner
child needs to have been started, and the outer child is no longer able
to access the uid_map file, since it lost access to it when setting up
the mounts for the inner child.
So we need to communicate the uid shift back out, along with the PID of
the inner child process.
Failing to communicate this means that the invalid UID shift, which is
the value used to specify "this needs to be determined from the file
system" is left invalid, so setting up the user namespace's UID shift
fails.
1) never bother with setting the flag for loopback devices
2) if we fail to write the flag due to EROFS (which is likely to happen
in containers where /proc/sys is read-only) or any other error, check
if the flag already has the right value. If so, don't complain.
Closes#469
Just like we conditionalize loading kdbus.ko, we should conditionalize
mounting kdbusfs. Otherwise, we might run with kdbus if it is builtin,
even though the user didn't want this.
This patch add support for ipv6 privacy extensions.
The variable /proc/sys/net/ipv6/conf/<if>/use_tempaddr
can be changed via the boolean
IPv6PrivacyExtensions=[yes/no/prefer-temporary]
When true enables privacy extensions, but prefer public addresses over
temporary addresses.
prefer-temporary prefers temporary adresses over public addresses.
Defaults to false.
[Match]
Name=enp0s25
[Network]
IPv6PrivacyExtensions=prefer-temporary
We refer to the same sysctl-setting twice, which is misleading. Correctly
list all global forwarding options. As we _always_ change the forwarding
setting on links, they will get disabled by default. The global sysctl
defaults thus will not have any effect.
On dbus1, we receive systemd1.Agent signals via the private socket, hence
it's trusted. However, on kdbus we receive it on the system bus. We must
make sure it's sent by UID=0, otherwise unprivileged users can fake it.
Furthermore, never forward broadcasts we sent ourself. This might happen
on kdbus, as we forward the message on the same bus we received it on,
thus ending up in an endless loop.
Running `busctl monitor` currently buffers data for several seconds /
kilobytes before writing stdout. This is highly confusing if you dump in a
file, ^C busctl and then end up with a file with data of the last few
_seconds_ missing.
Fix this by explicitly flushing after each signal.
sd_bus_flush_close_unref() is a call that simply combines sd_bus_flush()
(which writes all unwritten messages out) + sd_bus_close() (which
terminates the connection, releasing all unread messages) +
sd_bus_unref() (which frees the connection).
The combination of this call is used pretty frequently in systemd tools
right before exiting, and should also be relevant for most external
clients, and is hence useful to cover in a call of its own.
Previously the combination of the three calls was already done in the
_cleanup_bus_close_unref_ macro, but this was only available internally.
Also see #327
systemd-journald races with systemd-tmpfiles-setup, and hence both are
started at about the same time. On a bare-bones system (e.g. with
empty /var, or even non-existent /var), systemd-tmpfiles will create
/var/log. But it can happen too late, that is systemd-journald already
attempted to mkdir /var/log/journal, ignoring the error. Thus failing
to create /var/log/journal. One option, without modifiying the
dependency graph is to create /var/log/journal directory with parents,
when persistent storage has been requested.
Qemu provides a separate pci-bridge exclusively for multi-seat setups.
The normal pci-pci bridge ("-device pci-bridge") has 1b36:0001. The new
pci-bridge-seat was specifically added to simplify guest-side
multiseat configuration. It is identical to the normal pci-pci bridge,
except that it has a different id (1b36:000a) so we can match it and
configure multiseating automatically.
Make sure we always treat this as separate seat if we detect this, just
like other "Pluggable" devices.
(David: write commit-message)
According to README we only need 3.7, and while it may also make sense
to bump that requirement when appropriate, it's trivial to fall back
when renameat2 is not available.
When we get notifications from the kernel, we always turn them into
synthetic dbus1 messages. This means, we do *not* consume the kdbus
message, and as such have to free the offset.
Right now, the translation-helpers told the caller that they consumed the
message, which is wrong. Fix this by explicitly releasing all kernel
messages that are translated.
Due to our _cleanup_ usage for the udev manager, it will be destroyed
after the "exit:" label has finished. Therefore, it is the last
destruction done in main(). This has two side-effects:
- mac_selinux is destroyed before the udev manager is, possible causing
use-after-free if the manager-cleanup accesses selinux data
- log_close() is called *before* the manager is destroyed, possibly
re-opening the log if you use --debug (and thus not re-applying the
--debug option)
Avoid this by moving the manager-handling into a new function called
run(). This function will be left before we enter the "exit:" label in
main(), hence, the manager object will be destroyed early.
Richard Maw
Lennart Poettering
Torstein Husebø
Tom Gundersen
Daniel Mack
Zbigniew Jędrzejewski-Szmek
Kay Sievers
David Herrmann
Susant Sahani
Miguel Bernal Marin
David Herrmann
Dimitri John Ledkov
rinrinne
Gerd Hoffmann
Michael Marineau
Vedran Miletić