Same reason as the reload, reexec is disruptive and it requires the
same privileges, so if somebody wants to limit reloads, they'll also
want to limit reexecs, so use the same setting.
This fixes a race condition crash in homed that would happen in the
following sequence of events:
1. Client 1 takes a ref on the home area
2. Client 1 calls some method via dbus
3. Client 2 calls Release()
In homed, the Release() would check if a ref is still held (in this
case: yes it is) and returns an error. Except that is done through a
code-path that asserts that no operations are ongoing. In this case,
it's valid to have an ongoing operation, and so the assertion fails
causing homed to crash.
When sd-run connects to D-Bus rather than the private socket, it will
generate the transient unit name using the bus ID assigned by the D-Bus
broker/daemon. The issue is that this ID is only unique per D-Bus run,
if the broker/daemon restarts it starts again from 1, and it's a simple
incremental counter for each client.
So if a transient unit run-u6.service starts and fails, and it is not
collected (default on failure), and the system soft-reboots, any new
transient unit might conflict as the counter will restart:
Failed to start transient service unit: Unit run-u6.service was already loaded or has a fragment file.
Get the soft-reboot counter, and if it's greater than zero, append it
to the autogenerated unit name to avoid clashes.
losetup in util-linux 2.40 started reporting lost loop devices [0] and
it has an unfortunate side-effect where it reports lost devices even in
containers, which then makes the loop device check "falsely" pass [1].
Let's just check for /dev/loop-control explicitly to "work around" this.
[0] a6ca0456cc
[1] https://github.com/util-linux/util-linux/issues/2824
Today listen file descriptors created by socket unit don't get passed to
commands in Exec{Start,Stop}{Pre,Post}= socket options.
This prevents ExecXYZ= commands from accessing the created socket FDs to do
any kind of system setup which involves the socket but is not covered by
existing socket unit options.
One concrete example is to insert a socket FD into a BPF map capable of
holding socket references, such as BPF sockmap/sockhash [1] or
reuseport_sockarray [2]. Or, similarly, send the file descriptor with
SCM_RIGHTS to another process, which has access to a BPF map for storing
sockets.
To unblock this use case, pass ListenXYZ= file descriptors to ExecXYZ=
commands as listen FDs [4]. As an exception, ExecStartPre= command does not
inherit any file descriptors because it gets invoked before the listen FDs
are created.
This new behavior can potentially break existing configurations. Commands
invoked from ExecXYZ= might not expect to inherit file descriptors through
sd_listen_fds protocol.
To prevent breakage, add a new socket unit parameter,
PassFileDescriptorsToExec=, to control whether ExecXYZ= programs inherit
listen FDs.
[1] https://docs.kernel.org/bpf/map_sockmap.html
[2] https://lore.kernel.org/r/20180808075917.3009181-1-kafai@fb.com
[3] https://man.archlinux.org/man/socket.7#SO_INCOMING_CPU
[4] https://www.freedesktop.org/software/systemd/man/latest/sd_listen_fds.html
Drop connections and caches and reload config from files, to allow
for low-interruptions updates, and hook up to the usual SIGHUP and
ExecReload=. Mark servers and services configured directly via D-Bus
so that they can be kept around, and only the configuration file
settings are dropped and reloaded.
Fixes https://github.com/systemd/systemd/issues/17503
Fixes https://github.com/systemd/systemd/issues/20604
This patch fixes an issue where, when not specifiying either at least one
`SocketBindAllow` or `SocketBindDeny` rule, behavior for the bind syscall
filtering would be unexpected.
For example, when trying to bind to a port with only "SocketBindDeny=any"
given, the syscall would succeed:
> systemd-run -t -p "SocketBindDeny=any" nc -l 8080
Expected with this set of rules (also in accordance with the documentation)
would be an Operation not permitted error.
This behavior occurs because a default initialized socket_bind_rule struct
matches what "any" represents. When creating the bpf list all elements get
default initialized, as such represeting "any". Seemingly it is necressarry
to set the size of the map to at least one, as such if no allow rule is
given default initialization and minimal map size cause one any allow rule
to be in the map, causing the behavior observed above.
This patch solves this by introducing a new "match nothing" magic stored in
the rule's address family and setting such a rule as the first one if no
rule is given, making sure that default initialized rule structs are never
used.
Resolves#30556
Rate limiting authentication attempts in the test can cause somewhat
sporadic test failures: adding a test case might suddenly cause future
test cases to fail because of too many authentication attempts too
quickly
We're not trying to test the rate-limiting, we're trying to test the
functionality of homed. So we effectively disable rate-limiting on all
the home areas we create
This makes it possible to update a home record (and blob directory) of a
home area that's either completely absent (i.e. on a USB stick that's
unplugged) or just inaccessible due to lack of authentication
This bypasses authentication (i.e. user_record_authenticate) if the
volume key was loaded from the keyring and no secret section is
provided.
This also changes Update() and Resize() to always try and load the
volume key from the keyring. This makes the secret section optional for
these methods while still letting them function (as long as the home
area is active)
Private images are not reused, they are unique to tests, so delete them
as they take a lot of disk space, and we are starting to run in /var/tmp
space issues on the Ubuntu CI
Naming is always a matter of preference, and the old name would certainly work,
but I think the new one has the following advantages:
- A verb is better than a noun.
- The name more similar to "the competition", i.e. 'sudo', 'pkexec', 'runas',
'doas', which generally include an action verb.
- The connection between 'systemd-run' and 'run0' is more obvious.
There has been no release yet with the old name, so we can rename without
caring for backwards compatibility.
Currently, if a unit file is enabled from outside of the search path,
and that unit has an alias, then the symlink ends up pointing outside of
the search path too. For example:
$ cat /tmp/a.service
[Service]
ExecStart=sleep infinity
[Install]
Alias=b.service
WantedBy=multi-user.target
$ systemctl enable /tmp/a.service
Created symlink /etc/systemd/system/a.service → /tmp/a.service.
Created symlink /etc/systemd/system/b.service → /tmp/a.service.
Created symlink /etc/systemd/system/multi-user.target.wants/a.service → /tmp/a.service.
This then means the alias is treated as a separate unit:
$ systemctl start a.service
$ sudo systemctl status a
● a.service
Loaded: loaded (/etc/systemd/system/a.service; enabled; preset: enabled)
Active: active (running) since Fri 2024-03-15 15:17:49 EDT; 9s ago
Main PID: 769593 (sleep)
Tasks: 1 (limit: 18898)
Memory: 220.0K
CPU: 5ms
CGroup: /system.slice/a.service
└─769593 sleep infinity
Mar 15 15:17:49 six systemd[1]: Started a.service.
$ sudo systemctl status b
○ b.service
Loaded: loaded (/etc/systemd/system/b.service; alias)
Active: inactive (dead)
To fix this, make sure the alias uses a target that is inside the search
path. Since the unit file itself is outside of the search path, a
symlink inside the search path will have been created already. Hence,
just point the alias symlink to that recently created symlink.
This also drop the support of /run/systemd/netif/persistent-storage-ready,
as the file is anyway removed when networkd is stopped.
Let's use $SYSTEMD_NETWORK_PERSISTENT_STORAGE_READY=1 instead on testing.
If both $ARTIFACT_DIRECTORY and $SPLIT_TEST_LOGS are set, split the
output from each test into a separate log file, so we don't have to load
one ginormous log file when checking the results.
In automated QA environments there may be tests that are known to fail,
and being able to skip them is useful to remove known failures from the
test log.
Signed-off-by: Ross Burton <ross.burton@arm.com>
When reading test logs manually it is a lot easier when the tests are
sorted by name rather than by disk order.
Signed-off-by: Ross Burton <ross.burton@arm.com>
