Topi Miettinen [Fri, 8 Feb 2019 17:25:00 +0000 (19:25 +0200)]
core: ProtectHostname= feature
Let services use a private UTS namespace. In addition, a seccomp filter is
installed on set{host,domain}name and a ro bind mounts on
/proc/sys/kernel/{host,domain}name.
Franck Bui [Wed, 13 Feb 2019 17:45:36 +0000 (18:45 +0100)]
namespace: make MountFlags=shared work again
Since commit 0722b359342d2a9f9e0d453875624387a0ba1be2, the root mountpoint is
unconditionnally turned to slave which breaks units that are using explicitly
MountFlags=shared (and no other options that would implicitly require a slave
root mountpoint).
dhcp: don't stop receiving packets when the link goes down
When the link goes down, DHCP client_receive_message*() functions return an
error and the related I/O source is removed from the main loop. With the
current implementation of systemd-networkd this doesn't matter because the DHCP
client is always stopped on carrier down and restarted on carrier up. However
it seems wrong to have the DHCP client crippled (because no packet can be
received anymore) once the link goes temporarily down.
Change the receive functions to ignore a ENETDOWN event so that the client will
be able to receive packets again after the link comes back.
Allocate temporary strings to hold dbus paths on the heap
Paths are limited to BUS_PATH_SIZE_MAX but the maximum size is anyway too big
to be allocated on the stack, so let's switch to the heap where there is a
clear way to understand if the allocation fails.
Refuse dbus message paths longer than BUS_PATH_SIZE_MAX limit.
Even though the dbus specification does not enforce any length limit on the
path of a dbus message, having to analyze too long strings in PID1 may be
time-consuming and it may have security impacts.
In any case, the limit is set so high that real-life applications should not
have a problem with it.
Alexander Tsoy [Wed, 23 Jan 2019 13:33:50 +0000 (16:33 +0300)]
resolved: correctly prove the non-existense of wildcard
* Current logic:
For each NSEC RR find the common suffix between the owner name and
the next name, append asterisk to that suffix and check that
generated wildcard is covered by the NSEC RR in question.
* New logic:
Find NSEC RR covering queried name, generate wildcard as
<asterisk>.<closest encloser> using this RR, then check if any
of the NSEC RRs covers generated wildcard.
core: Allow to configure execute_directories execution behavior
This adds a new bitfield to `execute_directories()` which allows to
configure whether to ignore non-zero exit statuses of binaries run and
whether to allow parallel execution of commands.
In case errors are not ignored, the exit status of the failed script
will now be returned for error reposrting purposes or other further
future use.
Thomas Haller [Sun, 16 Dec 2018 21:02:21 +0000 (22:02 +0100)]
network: avoid inet_ntoa() in favor of inet_ntop()
inet_ntop() is not documented to be thread-safe, so it should not
be used in the DHCP library. Arguably, glibc uses a thread local
buffer, so indeed there is no problem with a suitable libc. Anyway,
just avoid it.
Thomas Haller [Fri, 14 Dec 2018 15:25:01 +0000 (16:25 +0100)]
dhcp: move filtering of bogus DNS/NTP addresses out of DHCP client
The DHCP client should not pre-filter addresses beyond what RFC
requires. If a client's user (like networkd) wishes to skip/filter
certain addresses, it's their responsibility.
The point of this is that the DHCP library does not hide/abstract
information that might be relevant for certain users. For example,
NetworkManager exposes DHCP options in its API. When doing that, the
options should be close to the actual lease.
Thomas Haller [Fri, 14 Dec 2018 10:10:57 +0000 (11:10 +0100)]
dhcp: handle multiple addresses for "Router" (option 3) in DHCP library
The Router DHCP option may contain a list of one or more
routers ([1]). Extend the API of sd_dhcp_lease to return a
list instead of only the first.
Note that networkd still only uses the first router (if present).
Aside from extending the internal API of the DHCP client, there
is almost no change in behavior. The only visible difference in
behavior is that the "ROUTER" variable in the lease file is now a
list of addresses.
Note how RFC 2132 does not define certain IP addresses as invalid for the
router option. Still, previously sd_dhcp_lease_get_router() would never
return a "0.0.0.0" address. In fact, the previous API could not
differenciate whether no router option was present, whether it
was invalid, or whether its first router was "0.0.0.0". No longer let
the DHCP client library impose additional restrictions that are not
part of RFC. Instead, the caller should handle this. The patch does
that, and networkd only consideres the first router entry if it is not
"0.0.0.0".
Thomas Haller [Fri, 14 Dec 2018 23:45:46 +0000 (00:45 +0100)]
network: don't return allocated buffer of zero length from deserialize_in_addrs()
deserialize_in_addrs() allocates the buffer before trying to parse
the IP address. Since a parsing error is silently ignored, the returned
size might be zero. In such a case we shouldn't return any buffer.
Anyway, there was no leak, because there are only two callers like
r = deserialize_in_addrs(&lease->dns, dns);
which both keep the unused buffer and later release it.
Note that deserialize_in_addrs() doesn't free the pointer before
reassigning the new output. The caller must take care to to pass
"ret" with an allocated buffer that would be leaked when returning
the result.
Thomas Haller [Mon, 18 Feb 2019 06:28:02 +0000 (07:28 +0100)]
netlink: fix routing-policy-rule netlink type for FRA_GOTO/FRA_UNUSED2
- RTA_OIF has no business in the routing-rule policy. It is numerical
identical to FRA_GOTO. Fix using the correct enum value. Note that
RTA_OIF/FRA_GOTO was not used by networkd, and the type was already
correct at uint32. So, there is no change in behavior.
- RTA_GATEWAY also does not belong to the routing-rules. It is numerical
identical to FRA_UNUSED2. Obviously, that value is unused as well,
so there is no actual change in behavior either. In particular
that is because:
- kernel would not send messages with FRA_UNUSED2 attribute.
- networkd would not try to parse/send RTA_GATEWAY/FRA_UNUSED2
attributes.
Initially, the check was that /usr is not a separate fs, and was later relaxed
to allow /usr to be mounted in the initramfs. Documentation was updated in 9e93f6f09229ffdbc46ab,
but this comment wasn't. Let's update it too.
Directories may be specified with the trailing dash or not.
The caveat is that for user configuration, systemd and other tools also look
at ~/.config/. It would be nice to support this, but this patch doesn't.
"cat-config --user" is rejected, and we may allow it in the future and then
extend the search path with directories under ~/.config.
What doesn't work (and probably shouldn't because those files cannot be
meaningfully concatenated):
The hardcoding of information about paths in this manner is a bit ugly, but
OTOH, it is not too onerous, and at least we have one place where all the
schemes are "documented" through code. It'll make us think twice before adding
yet another slightly different scheme.
udev: use the usual set of load paths for udev rules
This adds /usr/local/lib/udev/rules.d to the search path on non-split-usr systems.
On split-usr systems, the paths with /usr/-prefixes are added too.
In the past, on split-usr systems, it made sense to only load rules from
/lib/udev/rules.d, because /usr could be mounted late. But we don't support running
without /usr since 80758717a63, so in practice it doesn't matter whether the
rules files are in /lib/udev/rules.d or /usr/lib/udev/rules.d. Distributions
that maintain the illusion of functional split-usr are welcome to simply not put any
files in /usr/lib/udev/rules.d/.
In practice this doesn't change much, but it makes udev more consistent with the
rest of the systemd suite.
environment-d-generator: do not include /lib/environment.d in the list
This makes the code match documentation (opposite compared to previous
commits). This is user configuration, hence it should not depend on stuff
in /lib/ even when split-usr is used.
basic/hexdecoct: be more careful in overflow check
CID #139583: plen + 1 is evaluated as int, and could in principle overflow.
So cast to ssize_t and add an additional check that our overflow calculation
doesn't overflow itself.
Before a3ce813697bcc1c4644e097a2f1cd0459326d6ee, all properties in
src->properties and src->properties_db are mixed and copied to
dst->properties_db by device_copy_properties().
So, it is not necessary to store data from udev database file to
sd_device::properties_db before copying properties.
But now, properties are not mixed. So, the read data need to be
stored to also ::properties_db.
Fix section header for stable branches and backports. All the other
headings end in a colon and have no blank lines between them and the
body of the section, so fix this one accordingly.
Some tests will create a subtree of /sys under build/test/sys and
depending on the local system that tree might end up having an infinite
chain of symlinks. For example:
$ ls build/test/sys/devices/pnp0/00:00/subsystem/devices/00:00/subsystem/devices/00:00/subsystem/devices/00:00/subsystem/devices/00:00/subsystem/devices/00:00/subsystem/
devices drivers drivers_autoprobe
Exuberant ctags will by default follow symlinks, so configure it not to
do so through a local .ctags file setting --links=no.
Tested that `ctags -R` doesn't get stuck with the dotfile present.
Linux can be run on a device meant to act as a USB peripheral. In order
for a machine to act as such a USB device it has to be equipped with
a UDC - USB Device Controller.
This patch adds a target reached when UDC becomes available. It can be used
for activating e.g. a service unit which composes a USB gadget with
configfs and activates it.
Fixes: #11422
Oneshots going to inactive directly without ever entering UNIT_ACTIVE is
considered success. This however means that if something both Requires=
and Requisites= a unit of such nature, the verify-active job getting
merged into the start job makes it lose this property of failing the
depending jobs, as there, the start job has the result JOB_DONE on
success, so we never walk over RequisiteOf units.
This change makes sure that such units always go down. It is also only
meaningful with After=, but so is Requisite= itself. Also, we also catch
cases like a oneshot having RemainAfterExit= true making us start up
properly in such a setting, but then removing it, reloading the unit,
and restarting it. In such a case, we go down due to restart propagation
before them, and our start job waits on theirs, properly failing with
the JOB_DEPENDENCY result.
This covers cases where ConditionXYZ= creates a similar situation as
well.
Michael Olbrich [Sun, 3 Feb 2019 09:52:02 +0000 (10:52 +0100)]
v4l_id: use device_caps if available
According to the specification[1] the 'capabilities' describe the physical
device as a whole and the 'device_caps' describe the current device node.
The existence of 'device_caps' is indicated by the V4L2_CAP_DEVICE_CAPS
capability flag.
Use the 'device_caps' if available to generate the correct
ID_V4L_CAPABILITIES for the current device node.
This is relevant for UVC devices with current kernels: Two /dev/videoX
devices exist for those. One for video and one for metadata. The
V4L2_CAP_VIDEO_CAPTURE flag is present in the 'capabilities' for both
device nodes but only in the 'device_caps' of the video device node.
Without this, the ID_V4L_CAPABILITIES of the metadata device node
incorrectly contains 'capture'.
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