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adds a fully safe way how apps can pin files into /tmp temporarily, excepting them from the tmpfiles aging algorithm, based on BSD file locks on dirs we descend into
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.
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).
Here is a test case:
$ systemctl cat test-shared-mount-flag.service
# /etc/systemd/system/test-shared-mount-flag.service
[Service]
Type=simple
ExecStartPre=/usr/bin/mkdir -p /mnt/tmp
ExecStart=/bin/sh -c "/usr/bin/mount -t tmpfs -o size=10M none /mnt/tmp && sleep infinity"
ExecStop=-/bin/sh -c "/usr/bin/umount /mnt/tmp"
MountFlags=shared
$ systemctl start test-shared-mount-flag.service
$ findmnt /mnt/tmp
$
Mount on /mnt/tmp is not visible from the host although MountFlags=shared was
used.
This patch fixes that and turns the root mountpoint to slave when it's really
required.
Some settings cannot set simultaneously. Let's warn and drop
incompatible settings.
Currently, it is not comprehensive. But this may be a good first step.
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.
If sd_dhcp_lease_get_router() returns a positive value and the first
router is null, then invalid error cause was logged.
Follow-up for f8862395e8f802e4106a07ceaaf02b6a1faa5a6d.
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.
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.
* 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.
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.
FRA_TUN_ID is a 64 big endian integer. Fix the policy.
FRA_TUN_ID is unused by networkd, hence I think this bug
has no actual consequences.
Fixes: bce67bbee359eec19e6778619b6651100a1c1477
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.
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.
This is related to commit d9ec2e632df4905201facf76d6a205edc952116a
(dhcp4: filter bogus DNS/NTP server addresses silently).
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".
[1] https://tools.ietf.org/html/rfc2132#section-3.5
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.
