Otherwise it's a pointless excercise, as we'll set up an empty directory
tree that's never going to be used.
Hence, let's move this around a bit, so that we do the basesystem
initialization exactly when RootImage= or RootDirectory= are used, but
not otherwise.
MemoryDenyWriteExecution policy could be be bypassed by using pkey_mprotect
instead of mprotect to create an executable writable mapping.
The impact is mitigated by the fact that the man page says "Note that this
feature is fully available on x86-64, and partially on x86", so hopefully
people do not rely on it as a sole security measure.
Found by Karin Hossen and Thomas Imbert from Sogeti ESEC R&D.
https://bugs.launchpad.net/bugs/1725348
Let's clarify that it's not networkd that renames interfaces, but
something else (for example, udev's link builtin based on .link files)
This doesn't change any logic, it just rewords the message a bit, to
clarify that we only log this for informational purposes, not because we
execute the rename operation ourselves.
Fixes: #7143
Fix loginctl seat sysfs tree ellipsation logic.
Simple reproducer:
loginctl --full seat-status seat0|cat
→ after this PR, all lines are shown in full. Before, lines were ellipsized to terminal width.
This makes each system call in SystemCallFilter= blacklist optionally
takes errno name or number after a colon. The errno takes precedence
over the one given by SystemCallErrorNumber=.
C.f. #7173.
Closes#7169.
Let's hook up the sysfs tree output with the output flags logic,
already used when dumping log lines or process trees. This way we get
very similar output handling for line breaking/ellipsation in all three
outputs of structured data.
Fixes: #7095
Let's say that (size_t) -1 (i.e. SIZE_T_MAX) is equivalent to
"unbounded" ellipsation, i.e. ellipsation as NOP. In which case the
relevant functions become little more than strdup()/strndup().
This is useful to simplify caller code in case we want to turn off
ellipsation in certain code paths with minimal caller-side handling for
this.
loginctl, machinectl, systemctl all have very similar implementations of
a get_output_flags() functions. Simplify it by merging two lines that
set the same flag.
There should be a way to turn this logic of, and DefaultDependencies=
appears to be the right option for that, hence let's downgrade this
dependency type from "implicit" to "default, and thus honour
DefaultDependencies=.
This also drops mount_get_fstype() as we only have a single user needing
this now.
A follow-up for #7076.
Previously dependencies configured with SYSTEMD_WANTS would be collected
on a device unit as long as it was loaded. let's fix that, and remove
dependencies again when SYTEMD_WANTS changes.
This replaces the dependencies Set* objects by Hashmap* objects, where
the key is the depending Unit, and the value is a bitmask encoding why
the specific dependency was created.
The bitmask contains a number of different, defined bits, that indicate
why dependencies exist, for example whether they are created due to
explicitly configured deps in files, by udev rules or implicitly.
Note that memory usage is not increased by this change, even though we
store more information, as we manage to encode the bit mask inside the
value pointer each Hashmap entry contains.
Why this all? When we know how a dependency came to be, we can update
dependencies correctly when a configuration source changes but others
are left unaltered. Specifically:
1. We can fix UDEV_WANTS dependency generation: so far we kept adding
dependencies configured that way, but if a device lost such a
dependency we couldn't them again as there was no scheme for removing
of dependencies in place.
2. We can implement "pin-pointed" reload of unit files. If we know what
dependencies were created as result of configuration in a unit file,
then we know what to flush out when we want to reload it.
3. It's useful for debugging: "systemd-analyze dump" now shows
this information, helping substantially with understanding how
systemd's dependency tree came to be the way it came to be.
On Fedora /etc/init.d is a symlink to /etc/rc.d/init.d. Our build
scripts default to /etc/init.d since that is the LSB default. Let's make
sure the build script thus follows the symlink correctly and configures
to path explicitly, since otherwise our build artifacts in $DESTDIR are
incompatible with the setup we actually need for Fedora.
This way these dirs will be created automatically if they are missing,
thus always guaranteeing optimal speedy behaviour.
(Well at least, after https://github.com/systemd/mkosi/pull/181 is
merged)