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We really should try to be as precise as possible here. Saying
"your interfaces might be renamed" scares the shit of out people,
for obvious reasons. This change only touches some niche cases
fortunately, let's make this clear.
During the transition from system functions using errno to our own read and write functions with negative return codes some errors where introduced. This patch correctly convert errno to negative return codes for read and write and fix checks still using errno instead of the return code.
Closes#9283
This is generally the safer approach, and is what container managers
(including nspawn) do, hence let's move to this too for our own
services. This is particularly useful as this this means the new
@system-service system call filter group will get serious real-life
testing quickly.
This also switches from firing SIGSYS on unexpected syscalls to
returning EPERM. This would have probably been a better default anyway,
but it's hard to change that these days. When whitelisting system calls
SIGSYS is highly problematic as system calls that are newly introduced
to Linux become minefields for services otherwise.
Note that this enables a system call filter for udev for the first time,
and will block @clock, @mount and @swap from it. Some downstream
distributions might want to revert this locally if they want to permit
unsafe operations on udev rules, but in general this shiuld be mostly
safe, as we already set MountFlags=shared for udevd, hence at least
@mount won't change anything.
Currently we employ mostly system call blacklisting for our system
services. Let's add a new system call filter group @system-service that
helps turning this around into a whitelist by default.
The new group is very similar to nspawn's default filter list, but in
some ways more restricted (as sethostname() and suchlike shouldn't be
available to most system services just like that) and in others more
relaxed (for example @keyring is blocked in nspawn since it's not
properly virtualized yet in the kernel, but is fine for regular system
services).
$ git grep -e 'This program is free software' -l |grep -v LICENSE | \
xargs perl -i -0pe 's/ \* This program.*?for more details.\s*\*\n( \* You should have.*licenses.>.\n)?//gms'
For some reason they were missed previously. All those files seem to
have proper SDPX tags.
Docbook styles required those to be present, even though the templates that we
use did not show those names anywhere. But something changed semi-recently (I
would suspect docbook templates, but there was only a minor version bump in
recent years, and the changelog does not suggest anything related), and builds
now work without those entries. Let's drop this dead weight.
Tested with F26-F29, debian unstable.
$ perl -i -0pe 's/\s*<authorgroup>.*<.authorgroup>//gms' man/*xml
1) mv /var/tmp /var/tmp.old
2) mkdir /tmp/varrr
3) ln -s /tmp/varrr /var/tmp
Now, when a service has PrivateTmp=yes, during namespace setup,
/tmp is first mounted over with a new mount. Then, when /var/tmp
is being resolved, it points to /tmp/varrr, which by then doesn't
exist, because it had already been obscured.
These lines are generally out-of-date, incomplete and unnecessary. With
SPDX and git repository much more accurate and fine grained information
about licensing and authorship is available, hence let's drop the
per-file copyright notice. Of course, removing copyright lines of others
is problematic, hence this commit only removes my own lines and leaves
all others untouched. It might be nicer if sooner or later those could
go away too, making git the only and accurate source of authorship
information.
This part of the copyright blurb stems from the GPL use recommendations:
https://www.gnu.org/licenses/gpl-howto.en.html
The concept appears to originate in times where version control was per
file, instead of per tree, and was a way to glue the files together.
Ultimately, we nowadays don't live in that world anymore, and this
information is entirely useless anyway, as people are very welcome to
copy these files into any projects they like, and they shouldn't have to
change bits that are part of our copyright header for that.
hence, let's just get rid of this old cruft, and shorten our codebase a
bit.
On overlayfs, FTW_MOUNT causes nftw to not list *any* files because the
condition used by glibc to verify that it's on the same mountpoint doesn't work
on overlayfs, see https://bugzilla.suse.com/show_bug.cgi?id=1096807 for the
details.
However using FTW_MOUNT doesn't seem to be really needed when walking through
the keymap directorie tree. So until the glibc or the kernel is fixed (which
might take some time), let's make localectl works with overlayfs.
There's a small side effect here, by which regular (non-directory) files with
bind mounts will be parsed while they were skipped by the previous logic.
To make debugging easier, this patches allows one to change the log target and
do reload/reexec without modifying configuration permanently, which makes
debugging easier.
Indeed if one changed the log target at runtime (via the bus or via signals),
the change was lost on the next reload/reexecution.
In order to restore back the default value (set via system.conf, environment
variables or any other means ), the empty string in the "LogTarget" property is
now supported as well as sending SIGTRMIN+26 signal.
To make debugging easier, this patches allows one to change the log level and
do reload/reexec without modifying configuration permanently, which makes
debugging easier.
Indeed if one changed the log max level at runtime (via the bus or via
signals), the change was lost on the next daemon reload/reexecution.
In order to restore the original value back (set via system.conf, environment
variables or any other means), the empty string in the "LogLevel" property is
now supported as well as sending SIGRTMIN+23 signal.
Let's add "const" where we don't change structures passed.
Also, we generally use "unsigned char" for IP prefix length values, do
so here too. Previously different parts of the sd-radv.h API used
different types for this.
