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Now that the list is user-visible, @default should be first.
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This should make it easier for users to understand what each filter
means as the list of syscalls is updated in subsequent systemd versions.
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Add "perpetual" unit concept, sysctl fixes, networkd fixes, systemctl color fixes, nspawn discard.
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preparation for 232
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overly long description strings
This essentially reverts one part of d054f0a4d451120c26494263fc4dc175bfd405b1.
(We might also choose to use proper ellipsation here, but I wasn't sure the
memory allocation this requires wouöld be a good idea here...)
Fixes: #4534
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Preserve stored fds over service restart
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Reported by @evverx in #4493.
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more seccomp fixes, and change of order of selinux/aa/smack and seccomp application on exec
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Unfortunately, github drops the original commiter when a PR is "squashed" (even
if it is only a single commit) and replaces it with some rubbish
github-specific user id. Thus, to make the contributors list somewhat useful,
update the .mailmap file and undo all the weirdness github applied there.
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Since service_add_fd_store() already does the check, remove the redundant check
from service_add_fd_store_set().
Also, print a warning when repopulating FDStore after daemon-reexec and we hit
the limit. This is a user visible issue, so we should not discard fds silently.
(Note that service_deserialize_item is impacted by the return value from
service_add_fd_store(), but we rely on the general error message, so the caller
does not need to be modified, and does not show up in the diff.)
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Let's propagate the error here, instead of eating it up early.
In a later change we should probably also change mount_enumerate() to propagate
errors up, but that would mean we'd have to change the unit vtable, and thus
change all unit types, hence is quite an invasive change.
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Fixes: #3870
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Let's make sure that our loopback files remain sparse, hence let's set
"discard" as mount option on file systems that support it if the backing device
is a loopback.
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Make the underlining between the header and the body and between the units of
different types span the whole width of the table.
Let's never make the table wider than necessary (which is relevant due the
above).
When space is limited and we can't show the full ID or description string
prefer showing the full ID over the full description. The ID is after all
something people might want to copy/paste, while the description is mostly just
helpful decoration.
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If we turn on red color for the active column and it is not combined with
underlining, then we need to turn it off explicitly afterwards. Do that.
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Let's place only one ternary operator.
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Let's only check for eof once after the fgets(). There's no point in checking
EOF before the first read, and twice in each loop.
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This way, we can get rid of a label/goto.
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Let's make missing write access to /proc/sys non-fatal to the sysctl service.
This is a follow-up to 411e869f497c7c7bd0688f1e3500f9043bc56e48 which altered
the condition for running the sysctl service to check for /proc/sys/net being
writable, accepting that /proc/sys might be read-only. In order to ensure the
boot-up stays clean in containers lower the log level for the EROFS errors
generated due to this.
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Now that have a proper concept of "perpetual" units, let's make the root mount
one too, since it also cannot go away.
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So far "no_gc" was set on -.slice and init.scope, to units that are always
running, cannot be stopped and never exist in an "inactive" state. Since these
units are the only users of this flag, let's remodel it and rename it
"perpetual" and let's derive more funcitonality off it. Specifically, refuse
enqueing stop jobs for these units, and report that they are "unstoppable" in
the CanStop bus property.
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(#4533)
Always initialize the supplementary groups of caller before checking the
unit SupplementaryGroups= option.
Fixes https://github.com/systemd/systemd/issues/4531
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This is a follow-up for 6309e51ea32d64524431ee65c49eecd44390da8f and makes sure
we compare test results with the right user identifier.
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If execve() or socket() is filtered the service manager might get into trouble
executing the service binary, or handling any failures when this fails. Mention
this in the documentation.
The other option would be to implicitly whitelist all system calls that are
required for these codepaths. However, that appears less than desirable as this
would mean socket() and many related calls have to be whitelisted
unconditionally. As writing system call filters requires a certain level of
expertise anyway it sounds like the better option to simply document these
issues and suggest that the user disables system call filters in the service
temporarily in order to debug any such failures.
See: #3993.
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Seccomp is generally an unprivileged operation, changing security contexts is
most likely associated with some form of policy. Moreover, while seccomp may
influence our own flow of code quite a bit (much more than the security context
change) make sure to apply the seccomp filters immediately before executing the
binary to invoke.
This also moves enforcement of NNP after the security context change, so that
NNP cannot affect it anymore. (However, the security policy now has to permit
the NNP change).
This change has a good chance of breaking current SELinux/AA/SMACK setups, because
the policy might not expect this change of behaviour. However, it's technically
the better choice I think and should hence be applied.
Fixes: #3993
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@resources contains various syscalls that alter resource limits and memory and
scheduling parameters of processes. As such they are good candidates to block
for most services.
@basic-io contains a number of basic syscalls for I/O, similar to the list
seccomp v1 permitted but slightly more complete. It should be useful for
building basic whitelisting for minimal sandboxes
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These system calls clearly fall in the @ipc category, hence should be listed
there, simply to avoid confusion and surprise by the user.
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The system call is already part in @default hence implicitly allowed anyway.
Also, if it is actually blocked then systemd couldn't execute the service in
question anymore, since the application of seccomp is immediately followed by
it.
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Timing and sleep are so basic operations, it makes very little sense to ever
block them, hence don't.
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Switch drivers uses phys_port_name attribute to pass front panel port
name to user. Use it to generate netdev names.
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
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This test fails before previous commit, and passes with it.
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We would close all the stored fds in service_release_resources(), which of
course broke the whole concept of storing fds over service restart.
Fixes #4408.
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"Secondary arch" table for mips is entirely speculative…
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Lustre is also a remote file system that wants the network to be up before it is mounted.
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This introduces a new option, `tcrypt-veracrypt`, that sets the
corresponding VeraCrypt flag in the flags passed to cryptsetup.
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A pendant for #4481.
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systemd-escape manpage improvements
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The first example wasn't phrased with "To ..." as the other three are,
and the last example was lacking the colon.
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The option does more than the documentation gave it credit for.
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