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We have an embedded board with a couple of ethernet ports. From the kernel
log, I can see that the ethernet drivers are obtaining their correct MAC
address, but for some reason, at first systemd-networkd doesn't see the
mac address for the ethernet port at the time that it looks at
dhcp_client_identifier configuration (it has 00:00:00:00:00:00 for mac).
Later on, systemd-networkd gets a link_update() call, and at this time, it
has the correct mac address for the ethernet port. However, in link_update()
the dhcp_client_identifier configuration is not being considered, and a call
to sd_dhcp_client_set_iaid_duid() is being done always
Let's lock the personality to the currently set one, if nothing is
specifically specified. But do so with a grain of salt, and never
default to any exotic personality here, but only PER_LINUX or
PER_LINUX32.
Add LockPersonality boolean to allow locking down personality(2)
system call so that the execution domain can't be changed.
This may be useful to improve security because odd emulations
may be poorly tested and source of vulnerabilities, while
system services shouldn't need any weird personalities.
> glibc exports a function called sync(), we should probably avoid
> overloading that as a variable here locally (gcc even used to warn about
> that, not sure why it doesn't anymore), to avoid confusion around what
> "if (sync)" actually means
This helps prevent symbol collisions with other programs and libraries. In particular,
because PAM modules are loaded into the process that is creating the session, and
systemd creates PAM sessions, the potential for collisions is high.
Disambiguate all systemd calls by tagging a 'version' SD_SHARED.
Fixes#6624
`journalctl -o export | systemd-journal-remote -o /tmp/dir -`
gives the following error messages.
```
Failed to open output journal /tmp/dir: Invalid argument
Failed to get writer for source stdin: Invalid argument
Failed to create source for fd:0 (stdin): Invalid argument
```
And these are hard to understand what is the problem.
This commit makes journal-remote check whether the output file name
ends with .journal suffix or not, and if not, output error message.
This commit fixes crash described in
https://github.com/systemd/systemd/issues/6533
Multiple ExecStart lines are allowed only for oneshot services
anyway so it doesn't make sense to call service_run_next_main() with
services of type other than SERVICE_ONESHOT.
Referring back to reproducer from the issue, previously we didn't observe
this problem because s->main_command was reset after daemon-reload hence
we never reached the assert statement in service_run_next_main().
Fixes#6533
For files which are vital to boot
1. Avoid opening any window where power loss will zero them out or worse.
I know app developers all coded to the ext3 implementation, but
the only formal documentation we have says we're broken if we actually
rely on it. E.g.
* `man mount`, search for `auto_da_alloc`.
* http://www.linux-mtd.infradead.org/faq/ubifs.html#L_atomic_change
* https://thunk.org/tytso/blog/2009/03/15/dont-fear-the-fsync/
2. If we tell the kernel we're interested in writing them to disk, it will
tell us if that fails. So at minimum, this means we play our part in
notifying the user about errors.
I refactored error-handling in `udevadm-hwdb` a little. It turns out I did
exactly the same as had already been done in the `systemd-hwdb` version,
i.e. commit d702dcd.
