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seccomp: also block shmat(..., SHM_EXEC) for MemoryDenyWriteExecute
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Document NoNewPrivileges default value
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detect-virt: add --private-users switch to check if a userns is active; add Condition=private-users
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Various things don't work when we're running in a user namespace, but it's
pretty hard to reliably detect if that is true.
A function is added which looks at /proc/self/uid_map and returns false
if the default "0 0 UINT32_MAX" is found, and true if it finds anything else.
This misses the case where an 1:1 mapping with the full range was used, but
I don't know how to distinguish this case.
'systemd-detect-virt --private-users' is very similar to
'systemd-detect-virt --chroot', but we check for a user namespace instead.
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To more correctly reflect current behaviour as well as to provide
a few more details.
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shmat(..., SHM_EXEC) can be used to create writable and executable
memory, so let's block it when MemoryDenyWriteExecute is set.
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... and that that content might be outdated.
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various nss module/resolved fixes
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Fixes #4329.
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This unifies the suggested nsswitch.conf configuration for our four NSS modules to this:
hosts: files mymachines resolve [!UNAVAIL=return] dns myhostname
Note that this restores "myhostname" to the suggested configuration of
nss-resolve for the time being, undoing 4484e1792b64b01614f04b7bde97bf019f601bf9.
"myhostname" should probably be dropped eventually, but when we do this we
should do it in full, and not only drop it from the suggested nsswitch.conf
for one of the modules, but also drop it in source and stop referring to it
altogether.
Note that nss-resolve doesn't replace nss-myhostname in full: the former only
works if D-Bus/resolved is available for resolving the local hostname, the
latter works in all cases even if D-Bus or resolved are not in operation, hence
there's some value in keeping the line as it is right now. Note that neither
dns nor myhostname are considered at all with the above configuration unless
the resolve module actually returns UNAVAIL. Thus, even though handling of
local hostname resolving is implemented twice this way it is only executed once
for each lookup.
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Commandline parsing simplification and udev fix
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It may be desired by users to know what targets a particular service is
installed into. Improve user friendliness by teaching the is-enabled
command to show such information when used with --full.
This patch makes use of the newly added UnitFileFlags and adds
UNIT_FILE_DRY_RUN flag into it. Since the API had already been modified,
it's now easy to add the new dry-run feature for other commands as
well. As a next step, --dry-run could be added to systemctl, which in
turn might pave the way for a long requested dry-run feature when
running systemctl start.
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rename failure-action to emergency-action and use it for ctrl+alt+del burst
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This makes journald use the common option parsing functionality.
One behavioural change is implemented:
"systemd.journald.forward_to_syslog" is now equivalent to
"systemd.journald.forward_to_syslog=1".
I think it's nicer to use this way.
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The log forward levels can be configured through kernel command line.
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Fixes #4306
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Replaces: #4375
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Two unrelated patches: man page tweaks and rlimit log levels
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Fixes #4410. Also includes two minor improvements to the previous
sentence.
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Various install-related tweaks
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This commit adds a `fd` option to `StandardInput=`,
`StandardOutput=` and `StandardError=` properties in order to
connect standard streams to externally named descriptors provided
by some socket units.
This option looks for a file descriptor named as the corresponding
stream. Custom names can be specified, separated by a colon.
If multiple name-matches exist, the first matching fd will be used.
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Let's avoid the overly abbreviated "cgroups" terminology. Let's instead write:
"Linux Control Groups (cgroups)" is the long form wherever the term is
introduced in prose. Use "control groups" in the short form wherever the term
is used within brief explanations.
Follow-up to: #4381
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In certain situations drop-ins in /usr/lib/ are useful, for example when one package
wants to modify the behaviour of another package, or the vendor wants to tweak some
upstream unit without patching.
Drop-ins in /run are useful for testing, and may also be created by systemd itself.
Follow-up for the discussion in #2103.
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Fixes #3370.
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Fixes #4056.
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Fixes #4379.
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legacy hierarchy (#4269)
There are overlapping control group resource settings for the unified and
legacy hierarchies. To help transition, the settings are translated back and
forth. When both versions of a given setting are present, the one matching the
cgroup hierarchy type in use is used. Unfortunately, this is more confusing to
use and document than necessary because there is no clear static precedence.
Update the translation logic so that the settings for the unified hierarchy are
always preferred. systemd.resource-control man page is updated to reflect the
change and reorganized so that the deprecated settings are at the end in its
own section.
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endocode/djalal/sandbox-first-protection-kernelmodules-v1
core:sandbox: Add ProtectKernelModules= and some fixes
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A mix of fixes for typos and UK english
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Lets go further and make /lib/modules/ inaccessible for services that do
not have business with modules, this is a minor improvment but it may
help on setups with custom modules and they are limited... in regard of
kernel auto-load feature.
This change introduce NameSpaceInfo struct which we may embed later
inside ExecContext but for now lets just reduce the argument number to
setup_namespace() and merge ProtectKernelModules feature.
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The rawio system calls were filtered, but CAP_SYS_RAWIO allows to access raw
data through /proc, ioctl and some other exotic system calls...
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This is useful to turn off explicit module load and unload operations on modular
kernels. This option removes CAP_SYS_MODULE from the capability bounding set for
the unit, and installs a system call filter to block module system calls.
This option will not prevent the kernel from loading modules using the module
auto-load feature which is a system wide operation.
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Various smaller documentation fixes.
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Add an "invocation ID" concept to the service manager
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Let's clarify that for user services some OS-defined limits bound the settings
in the unit files.
Fixes: #4232
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Fixes: #4116
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also have a unit state of that name
Fixes: #3971
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variables
Document the default pagers used, as well as $SYSTEMD_LESSCHARSET.
Fixes: #4143
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It seems that this count was not updated when snapshot units were
removed in #1841.
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The --no-seal and --no-compress options were dropped and replaced with
boolean functionality. This syncs the man page with the code.
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This is like the previous reverted commit, but any boolean is still accepted,
not just "yes" and "no". Man page is adjusted to match the code.
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