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Device tree overlays are a convenient way to patch device trees, e.g.,
add new devices to a device tree or enable/disable devices. This is
useful for non-discoverable but configurable hardware. Device tree
overlays are commonly used for displays on the Raspberry Pi or for
describing the content of FPGA bitstreams.
Add the devicetree-overlay key to boot loader specification entries to
allow boot loaders to apply overlays.
See #13537
Just as `RuntimeMaxSec=` is supported for service units, add support for
it to scope units. This will gracefully kill a scope after the timeout
expires from the moment the scope enters the running state.
This could be used for time-limited login sessions, for example.
Signed-off-by: Philip Withnall <withnall@endlessm.com>
Fixes: #12035
We should never have used an unprefixed environment variable name.
All other systemd-nspawn variables have the "SYSTEMD_NSPAWN_" prefix,
and all other systemd variables have the "SYSTEMD_" prefix.
The new variable name takes precedence, but we fall back to checking the
old one. If only the old one is found, a warning is emitted.
In addition, SYSTEMD_NSPAWN_UNIFIED_HIERARCHY="" is accepted as an override
to avoid looking for the old variable name.
We have a variable with the same name ($UNIFIED_CGROUP_HIERARCHY) in tests,
which governs both systemd-nspawn and qemu behaviour. It is not renamed.
Introduce support for configuring cpus and mems for processes using
cgroup v2 CPUSET controller. This allows users to limit which cpus
and memory NUMA nodes can be used by processes to better utilize
system resources.
The cgroup v2 interfaces to control it are cpuset.cpus and cpuset.mems
where the requested configuration is written. However, it doesn't mean
that the requested configuration will be actually used as parent cgroup
may limit the cpus or mems as well. In order to reflect the real
configuration cgroup v2 provides read-only files cpuset.cpus.effective
and cpuset.mems.effective which are exported to users as well.
In various circumstances, overriding the kernel commandline can be inconvenient.
People have different bootloaders, and e.g. the grub config can be pretty scary.
grubby helps, but it isn't always available.
This option adds an alternative mechanism that can quite convenient on EFI
systems. cmdline settings have higher priority, because they can be (usually)
changed on the bootloader prompt.
$SYSTEMD_EFI_OPTIONS can be used to override, same as $SYSTEMD_PROC_CMDLINE.
In the past, we asked people to open a security bug on one of the "big"
distros. This worked OK as far as getting bugs reported and notifying some
upstream developers went. But we always had trouble getting information to
all the appropriate parties, because each time a bug was reported, a big
thread was created, with a growing CC list. People who were not CCed early
enough were missing some information, etc.
To clean this up, we decided to create a private mailing list. The natural
place would be freedesktop.org, but unfortunately the request to create a
mailing list wasn't handled
(https://gitlab.freedesktop.org/freedesktop/freedesktop/issues/134). And even
if it was, at this point, if there was ever another administrative issue, it
seems likely it could take months to resolve. So instead, we asked for a list
to be created on the redhat mailservers.
Please consider the previous security issue reporting mechanisms rescinded, and
send any senstive bugs to systemd-security@redhat.com.
Let's hide non-UTF-8 locales by default. It's 2019 after all.
Let's add an undocumented env var to reenable listing them though.
This should substantially shorten the list of choices we offer users,
and only show realistic choices.
note that only firstboot and localectl make use of this information, and
both allow configuration of values outside of these lists, hence all
this change does is hide legacy options, but they are still available if
you know what you do, and that's how it should be.
It was only used for exactly one thing: to substitute in the text in
/var/log/README. But it's use there was completely wrong, because the text
talks about "missing" log files from syslog, so even if we configured systemd
to log to a different directory, the "missing" log files would still be
"missing" from the old location.
Not everybody has those dirs in the filesystem (and they don't need to).
When creating an installation package using $DESTDIR, it is easy enough to
remove or ignore those directories, but if installing into a real root, it
is ugly to create and remove them. Let's add an option so people can skip
it if they want.
Inspired by #12930.
includes two travis ci steps:
1) Every pull-request/push all fuzzing targets will do a quick
sanity run on the generated corpus and crashes (via Fuzzit)
2) On a daily basis the fuzzing targets will be compiled (from
master) and will and their respectible fuzzing job on Fuzzit
will be updated to the new binary.
When shooting down a service with SIGABRT the user might want to have a
much longer stop timeout than on regular stops/shutdowns. Especially in
the face of short stop timeouts the time might not be sufficient to
write huge core dumps before the service is killed.
This commit adds a dedicated (Default)TimeoutAbortSec= timer that is
used when stopping a service via SIGABRT. In all other cases the
existing TimeoutStopSec= is used. The timer value is unset by default
to skip the special handling and use TimeoutStopSec= for state
'stop-watchdog' to keep the old behaviour.
If the service is in state 'stop-watchdog' and the service should be
stopped explicitly we still go to 'stop-sigterm' and re-apply the usual
TimeoutStopSec= timeout.
In cgroup v2 we have protection tunables -- currently MemoryLow and
MemoryMin (there will be more in future for other resources, too). The
design of these protection tunables requires not only intermediate
cgroups to propagate protections, but also the units at the leaf of that
resource's operation to accept it (by setting MemoryLow or MemoryMin).
This makes sense from an low-level API design perspective, but it's a
good idea to also have a higher-level abstraction that can, by default,
propagate these resources to children recursively. In this patch, this
happens by having descendants set memory.low to N if their ancestor has
DefaultMemoryLow=N -- assuming they don't set a separate MemoryLow
value.
Any affected unit can opt out of this propagation by manually setting
`MemoryLow` to some value in its unit configuration. A unit can also
stop further propagation by setting `DefaultMemoryLow=` with no
argument. This removes further propagation in the subtree, but has no
effect on the unit itself (for that, use `MemoryLow=0`).
Our use case in production is simplifying the configuration of machines
which heavily rely on memory protection tunables, but currently require
tweaking a huge number of unit files to make that a reality. This
directive makes that significantly less fragile, and decreases the risk
of misconfiguration.
After this patch is merged, I will implement DefaultMemoryMin= using the
same principles.
