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Dec 14 14:10:54 krowka systemd[1]: System is tainted: overflowgid-not-65534
-- Subject: The system is configured in a way that might cause problems
-- Defined-By: systemd
-- Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- The following "tags" are possible:
-- - "split-usr" — /usr is a separate file system and was not mounted when systemd
-- was booted
-- - "cgroups-missing" — the kernel was compiled without cgroup support or access
-- to expected interface files is resticted
-- - "var-run-bad" — /var/run is not a symlink to /run
-- - "overflowuid-not-65534" — the kernel user ID used for "unknown" users (with
-- NFS or user namespaces) is not 65534
-- - "overflowgid-not-65534" — the kernel group ID used for "unknown" users (with
-- NFS or user namespaces) is not 65534
-- Current system is tagged as overflowgid-not-65534.
We have a check and warning at compile time. The user cannot do anything about
this at runtime, and all other taints are about checks that happen at runtime
and are specific to that system (and at least potentially correctable).
(The logic in the compilation-time check was updated to treat "nogroup" as OK,
but not the runtime check. But I think it's better to remove the runtime check
for this altogether, so this becomes moot.)
This is useful to debug things, but also to hook up external post-up
scripts with resolved.
Eventually this code might be useful to implement a
resolvconf(8)-compatible interface for compatibility purposes. Since the
semantics don't map entirely cleanly as first step we add a native
interface for pushing DNS configuration into resolved, that exposes the
correct semantics, before adding any compatibility interface.
See: #7202
In similar fashion to the previous change, sync() operations can stall
endlessly if cache is unable to be written out. In order to avoid an
unbounded hang, the sync takes place within a child process. Every 10
seconds (SYNC_TIMEOUT_USEC), the value of /proc/meminfo "Dirty" is checked
to verify it is smaller than the last iteration. If the sync is not making
progress for 3 successive iterations (SYNC_PROGRESS_ATTEMPTS), a SIGKILL is
sent to the sync process and the shutdown continues.
The changes in pci.ids, usb.ids, and the .hwdb files are almost always
additions. 20-OUI.hwdb drops a few names and replaces them by
"IEEE Registration Authority". I'm not sure what to do about this.
Many other removals do not seem to be removals of real entries, but
rather placeholder or generic names.
I added the test if an optional parameter is not empty, but that doesn't work
with -u. Provide an empty "fallback" value to fix the issue.
Also group the update steps so that it's easier to see what is going on.
Remount, and subsequent umount, attempts can hang for inaccessible network
based mount points. This can leave a system in a hard hang state that
requires a hard reset in order to recover. This change moves the remount,
and umount attempts into separate child processes. The remount and umount
operations will block for up to 90 seconds (DEFAULT_TIMEOUT_USEC). Should
those waits fail, the parent will issue a SIGKILL to the child and continue
with the shutdown efforts.
In addition, instead of only reporting some additional errors on the final
attempt, failures are reported as they occur.
With Type=notify services, EXTEND_TIMEOUT_USEC= messages will delay any startup/
runtime/shutdown timeouts.
A service that hasn't timed out, i.e, start time < TimeStartSec,
runtime < RuntimeMaxSec and stop time < TimeoutStopSec, may by sending
EXTEND_TIMEOUT_USEC=, allow the service to continue beyond the limit for
the execution phase (i.e TimeStartSec, RunTimeMaxSec and TimeoutStopSec).
EXTEND_TIMEOUT_USEC= must continue to be sent (in the same way as
WATCHDOG=1) within the time interval specified to continue to reprevent
the timeout from occuring.
Watchdog timeouts are also extended if a EXTEND_TIMEOUT_USEC is greater
than the remaining time on the watchdog counter.
Fixes#5868.
These helper calls are potentially called often, and allocate FILE*
objects internally for a very short period of time, let's turn off
locking for them too.
Let's replace usage of fputc_unlocked() and friends by __fsetlocking(f,
FSETLOCKING_BYCALLER). This turns off locking for the entire FILE*,
instead of doing individual per-call decision whether to use normal
calls or _unlocked() calls.
This has various benefits:
1. It's easier to read and easier not to forget
2. It's more comprehensive, as fprintf() and friends are covered too
(as these functions have no _unlocked() counterpart)
3. Philosophically, it's a bit more correct, because it's more a
property of the file handle really whether we ever pass it on to another
thread, not of the operations we then apply to it.
This patch reworks all pieces of codes that so far used fxyz_unlocked()
calls to use __fsetlocking() instead. It also reworks all places that
use open_memstream(), i.e. use stdio FILE* for string manipulations.
Note that this in some way a revert of 4b61c87511.
This changes dns_name_between() to deal properly with checking whether B
is between A and C if A and C are equal. Previously we simply returned
-EINVAL in this case, refusing checking. With this change we correct
behaviour: if A and C are equal, then B is "between" both if it is
different from them. That's logical, since we do < and > comparisons, not
<= and >=, and that means that anything "right of A" and "left of C"
lies in between with wrap-around at the ends. And if A and C are equal
that means everything lies between, except for A itself.
This fixes handling of domains using NSEC3 "white lies", for example the
.it TLD.
Fixes: #7421
fputs() writes only first 2048 bytes and fails
to write to /proc when values are larger than that.
This patch adds a new flag to WriteStringFileFlags
that make it possible to disable the buffer under
specific cases.
This commit updates networkd behavior to check if the hostname option
received via DHCP is too long for Linux limit, and in case shorten it.
An overlong hostname will be truncated to the first dot or to
`HOST_MAX_LEN`, whatever comes earlier.
Since the new option `--network-namespace-path=` of systemd-nspawn
cannot be used together with other network-related options, we need
to add more smoke tests for checking these conditions of options.
Add a new option `--network-namespace-path` to systemd-nspawn to allow
users to specify an arbitrary network namespace, e.g. `/run/netns/foo`.
Then systemd-nspawn will open the netns file, pass the fd to
outer_child, and enter the namespace represented by the fd before
running inner_child.
```
$ sudo ip netns add foo
$ mount | grep /run/netns/foo
nsfs on /run/netns/foo type nsfs (rw)
...
$ sudo systemd-nspawn -D /srv/fc27 --network-namespace-path=/run/netns/foo \
/bin/readlink -f /proc/self/ns/net
/proc/1/ns/net:[4026532009]
```
Note that the option `--network-namespace-path=` cannot be used together
with other network-related options such as `--private-network` so that
the options do not conflict with each other.
Fixes https://github.com/systemd/systemd/issues/7361
Using strlen() to declare a buffer results in a variable-length array,
even if the compiler likely optimizes it to be a compile time constant.
When building with -Wvla, certain versions of gcc complain about such
buffers. Compiling with -Wvla has the advantage of preventing variably
length array, which defeat static asserts that are implemented by
declaring an array of negative length.
While the compiler likely optimizes strlen(x) for string literals,
it is not a constant expression.
Hence,
char buffer[strlen("OPTION_000") + 1];
declares a variable-length array. STRLEN() can be used instead
when a constant espression is needed.
It's not entirely identical to strlen(), as STRLEN("a\0") counts 2.
Also, it only works with string literals and the macro enforces
that the argument is a literal.
