Age | Commit message (Collapse) | Author |
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When re-executed, reconnect the console to PID1's stdios as it was the case
when PID1 was initially started by the kernel.
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Delete the dbus1 generator and some critical wiring. This prevents
kdbus from being loaded or detected. As such, it will never be used,
even if the user still has a useful kdbus module loaded on their system.
Sort of fixes #3480. Not really, but it's better than the current state.
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various changes, most importantly regarding memory metrics
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Permit services to detect whether their stdout/stderr is connected to the journal.
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If for whatever reason the file system is "corrupted", we want
to be resilient and ignore the error, as long as we can load the units
from a different place.
Arch bug https://bugs.archlinux.org/task/49547.
A user had an ntfs symlink (essentially a file) instead of a directory after
restoring from backup. We should just ignore that like we would treat a missing
directory, for general resiliency.
We should treat permission errors similarly. For example an unreadable
/usr/local/lib directory would prevent (user) instances of systemd from
loading any units. It seems better to continue.
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executed services
This permits services to detect whether their stdout/stderr is connected to the
journal, and if so talk to the journal directly, thus permitting carrying of
metadata.
As requested by the gtk folks: #2473
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Super-important change, yeah!
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Fix-up for 2a9a6f8ac04a69ca36d645f9305a33645f22a22b
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The unit files already accept relative, percent-based memory limit
specification, let's make sure "systemctl set-property" support this too.
Since we want the physical memory size of the destination machine to apply we
pass the percentage in a new set of properties that only exist for this
purpose, and can only be set.
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The various bits of code did the scaling all different, let's unify this,
given that the code is not trivial.
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THe latter is a kernelism, we only understand "infinity".
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When parsing unit files we already refuse unit memory limits of zero, let's
also refuse it when the value is set via the bus.
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settings
If a percentage is used, it is taken relative to the installed RAM size. This
should make it easier to write generic unit files that adapt to the local system.
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And port a couple of users over to it.
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When unit is marked as UNSURE, we are trying to find if it state was
changed over and over again. So lets not go through the UNSURE states
again. Also when we find a GOOD unit lets propagate the GOOD state to
all units that this unit reference.
This is a problem on machines with a lot of initscripts with different
starting priority, since those units will reference each other and the
original algorithm might get to n! complexity.
Thanks HATAYAMA Daisuke for the expand_good_state code.
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notifications (#3531)
Fixes: #3483
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Typing `rd.rescue` is easier than `rd.systemd.unit=rescue.target`.
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Move the merger of environment variables before setting up the PAM
session and pass the aggregate environment to PAM setup. This allows
control over the PAM session hooks through environment variables.
PAM session initiation may update the environment. On successful
initiation of a PAM session, we adopt the environment of the
PAM context.
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This patch implements the new magic character '!'. By putting '!' in front
of a command, systemd executes it with full privileges ignoring paramters
such as User, Group, SupplementaryGroups, CapabilityBoundingSet,
AmbientCapabilities, SecureBits, SystemCallFilter, SELinuxContext,
AppArmorProfile, SmackProcessLabel, and RestrictAddressFamilies.
Fixes partially https://github.com/systemd/systemd/issues/3414
Related to https://github.com/coreos/rkt/issues/2482
Testing:
1. Create a user 'bob'
2. Create the unit file /etc/systemd/system/exec-perm.service
(You can use the example below)
3. sudo systemctl start ext-perm.service
4. Verify that the commands starting with '!' were not executed as bob,
4.1 Looking to the output of ls -l /tmp/exec-perm
4.2 Each file contains the result of the id command.
`````````````````````````````````````````````````````````````````
[Unit]
Description=ext-perm
[Service]
Type=oneshot
TimeoutStartSec=0
User=bob
ExecStartPre=!/usr/bin/sh -c "/usr/bin/rm /tmp/exec-perm*" ;
/usr/bin/sh -c "/usr/bin/id > /tmp/exec-perm-start-pre"
ExecStart=/usr/bin/sh -c "/usr/bin/id > /tmp/exec-perm-start" ;
!/usr/bin/sh -c "/usr/bin/id > /tmp/exec-perm-star-2"
ExecStartPost=/usr/bin/sh -c "/usr/bin/id > /tmp/exec-perm-start-post"
ExecReload=/usr/bin/sh -c "/usr/bin/id > /tmp/exec-perm-reload"
ExecStop=!/usr/bin/sh -c "/usr/bin/id > /tmp/exec-perm-stop"
ExecStopPost=/usr/bin/sh -c "/usr/bin/id > /tmp/exec-perm-stop-post"
[Install]
WantedBy=multi-user.target]
`````````````````````````````````````````````````````````````````
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an instance (#3451)
Corrects: 7aad67e7
Fixes: #3438
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it (#3457)
Let's add an extra safety check before we chmod/chown a TTY to the right user,
as we might end up having connected something to STDIN/STDOUT that is actually
not a TTY, even though this might have been requested, due to permissive
StandardInput= settings or transient service activation with fds passed in.
Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=85255
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Let's explain #3444 briefly in the sources, too.
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Without this code the following can happen:
1. Open a file to keep a mount busy
2. Try to stop the corresponding mount unit with systemctl
-> umount fails and the failure is remembered in mount->result
3. Close the file and umount the filesystem manually
-> mount_dispatch_io() calls "mount_enter_dead(mount, MOUNT_SUCCESS)"
-> Old error in mount->result is reused and the mount unit enters a
failed state
Clear the old error result when 'mountinfo' reports a successful umount to
fix this.
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This basically reverts 7b2fd9d51259f6cf350791434e640ac3519acc6c ("core:
remove duplicate code in automount_update_mount()").
This was not duplicate code. The expire_tokens need to be handled as well:
Send 0 == success for MOUNT_DEAD (umount successful), do nothing for
MOUNT_UNMOUNTING (not yet done) and an error for everything else.
Otherwise the automount logic will assume unmounting is not done and will
not send any new requests for mounting. As a result, the corresponding
mount unit is never mounted.
Without this, automounts with TimeoutIdleSec= are broken. Once the idle
timeout triggered a umount, any access to the corresponding filesystem
hangs forever.
Fixes #3332.
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New exec boolean MemoryDenyWriteExecute, when set, installs
a seccomp filter to reject mmap(2) with PAGE_WRITE|PAGE_EXEC
and mprotect(2) with PAGE_EXEC.
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core: log cgroup legacy and unified hierarchy setting translations
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Recently added cgroup unified hierarchy support uses "max" in configurations
for no upper limit. While consistent with what the kernel uses for no upper
limit, it is inconsistent with what systemd uses for other controllers such as
memory or pids. There's no point in introducing another term. Update cgroup
unified hierarchy support so that "infinity" is the only term that systemd
uses for no upper limit.
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To accommodate changes in kernel interface, cgroup unified hierarchy support
added several configuration items which overlap with the existing resource
control settings and there is simple config translation between the overlapping
settings to ease the transition. As why certain cgroup knobs are being
configured can become confusing, this patch adds a master warning message which
is printed once when such translation is first used and logs each translation
with a debug message.
v2:
- Switched to log_unit*().
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cgroup_context_apply() and friends take CGroupContext and cgroup path as input
and has no way of getting back to the associated Unit and thus uses raw cgroup
path for logging. This makes the log messages difficult to track down.
There's no reason to avoid passing in Unit into these functions. Pass in Unit
and use log_unit*() instead.
While at it, make cgroup_context_apply(), which has no outside users, static.
Also, drop cgroup path from log messages where the path itself isn't too
interesting and can be easily obtained from the unit.
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Implement sets of system calls to help constructing system call
filters. A set starts with '@' to distinguish from a system call.
Closes: #3053, #3157
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The current raw_clone function takes two arguments, the cloning flags and
a pointer to the stack for the cloned child. The raw cloning without
passing a "thread main" function does not make sense if a new stack is
specified, as it returns in both the parent and the child, which will fail
in the child as the stack is virgin. All uses of raw_clone indeed pass NULL
for the stack pointer which indicates that both processes should share the
stack address (so you better don't pass CLONE_VM).
This commit refactors the code to not require the caller to pass the stack
address, as NULL is the only sensible option. It also adds the magic code
needed to make raw_clone work on sparc64, which does not return 0 in %o0
for the child, but indicates the child process by setting %o1 to non-zero.
This refactoring is not plain aesthetic, because non-NULL stack addresses
need to get mangled before being passed to the clone syscall (you have to
apply STACK_BIAS), whereas NULL must not be mangled. Implementing the
conditional mangling of the stack address would needlessly complicate the
code.
raw_clone is moved to a separete header, because the burden of including
the assert machinery and sched.h shouldn't be applied to every user of
missing_syscalls.h
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This reverts part of #3329, but all for a good cause.
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unit_write_drop_in{,_private}{,_format} are all affected.
We already append a header to the file (and section markers), so those functions
can only be used to write a whole file at once. Including the newline at
the end feels natural.
After this commit newlines will be duplicated. They will be removed in
subsequent commit.
Also, rewrap the "autogenerated" header to fit within 80 columns.
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various sd-Ipv4ll/sd-ipv4acd fixes
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On the unified hierarchy, memory controller implements three control knobs -
low, high and max which enables more useable and versatile control over memory
usage. This patch implements support for the three control knobs.
* MemoryLow, MemoryHigh and MemoryMax are added for memory.low, memory.high and
memory.max, respectively.
* As all absolute limits on the unified hierarchy use "max" for no limit, make
memory limit parse functions accept "max" in addition to "infinity" and
document "max" for the new knobs.
* Implement compatibility translation between MemoryMax and MemoryLimit.
v2:
- Fixed missing else's in config_parse_memory_limit().
- Fixed missing newline when writing out drop-ins.
- Coding style updates to use "val > 0" instead of "val".
- Minor updates to documentation.
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dbus-cgroup fixes
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Except for per-device BlockIO, IO and DeviceAllow/Deny settings, all were
missing newline causing the next drop-in to be concatenated at the end of the
line. Fix it.
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bus_cgroup_set_property() was rejecting if the input value was in range.
Reverse it.
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Recently added cgroup helper functions break the style convention. Fix them
up.
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Implement compat translation between IO* and BlockIO* settings
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free_and_strdup handles NULL but not empty strings.
See also:
https://github.com/systemd/systemd/pull/3283#issuecomment-220603145
https://github.com/systemd/systemd/pull/3307
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Adds support to core for systemd D-Bus clients to send the
`SELinuxContext` property . This means `systemd-run -p
SELinuxContext=foo` should now work.
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free_and_strdup already handles the NULL case for us, so we can remove
an extraneous conditional check.
As noted in https://github.com/systemd/systemd/pull/3279/files#r63687717
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Due to the substantial interface changes in cgroup unified hierarchy, new IO
settings are introduced. Currently, IO settings apply only to unified
hierarchy and BlockIO to legacy. While the transition is necessary, it's
painful for users to have to provide configs for both. This patch implements
translation from one config set to another for configs which make sense.
* The translation takes place during application of the configs. Users won't
see IO or BlockIO settings appearing without being explicitly created.
* The translation takes place only if there is no config for the matching
cgroup hierarchy type at all.
While this doesn't provide comprehensive compatibility, it should considerably
ease transition to the new IO settings which are a superset of BlockIO
settings.
v2:
- Update test-cgroup-mask.c so that it accounts for the fact that
CGROUP_MASK_IO and CGROUP_MASK_BLKIO move together. Also, test/parent.slice
now sets IOWeight instead of BlockIOWeight.
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Factor out the following functions out of cgroup_context_apply()
* cgroup_context_[blk]io_weight()
* cgroup_apply_[blk]io_device_weight()
* cgroup_apply_[blk]io_device_limit()
This is pure refactoring and shouldn't cause any functional differences.
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