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getopt allows non-ambiguous abbreviations, so backwards-compat is maintained, and
people can use --kill-who (or even shorter abbreviations). English is flexible,
so in common speach people would use both forms, even if "whom" is technically
more correct. The advantage of using the longer form in the code is that we
effectively allow both forms, so we stop punishing people who DTGCT¹, but still
allow people to use the spoken form if they prefer.
1. Do the gramatically correct thing
We can't get any FS meta-data from a suspended device. Hence defer
making any plugged/unplugged decisions, i.e. we just import whatever was
previous state and skip processing all other rules.
Thanks Lennart Poettering <lennart@poettering.net> for suggesting this
solution.
This reverts PR #23269 and its follow-up commit. Especially,
2299b1cae3 (partially), and
3cf63830ac.
The PR was merged without final approval, and has several issues:
- The NetLabel for static addresses are not assigned, as labels are
stored in the Address objects managed by Network, instead of Link.
- If NetLabel is specified for a static address, then the address
section will be invalid and the address will not be configured,
- It should be implemented with Request object,
- There is no test about the feature.
This reverts PR #22587 and its follow-up commit. More specifically,
2299b1cae3 (partially),
e176f85527,
ceb46a31a0, and
51bb9076ab.
The PR was merged without final approval, and has several issues:
- OSS fuzz reported issues in the conf parser,
- It calls synchrnous netlink call, it should not be especially in PID1,
- The importance of NFTSet for CGroup and DynamicUser may be
questionable, at least, there was no justification PID1 should support
it.
- For networkd, it should be implemented with Request object,
- There is no test for the feature.
Fixes#23711.
Fixes#23717.
Fixes#23719.
Fixes#23720.
Fixes#23721.
Fixes#23759.
New directive `DynamicUserNFTSet=` provides a method for integrating
configuration of dynamic users into firewall rules with NFT sets.
Example:
```
table inet filter {
set u {
typeof meta skuid
}
chain service_output {
meta skuid != @u drop
accept
}
}
```
```
/etc/systemd/system/dunft.service
[Service]
DynamicUser=yes
DynamicUserNFTSet=inet:filter:u
ExecStart=/bin/sleep 1000
[Install]
WantedBy=multi-user.target
```
```
$ sudo nft list set inet filter u
table inet filter {
set u {
typeof meta skuid
elements = { 64864 }
}
}
$ ps -n --format user,group,pid,command -p `pgrep sleep`
USER GROUP PID COMMAND
64864 64864 55158 /bin/sleep 1000
```
New directives `NFTSet=`, `IPv4NFTSet=` and `IPv6NFTSet=` provide a method for
integrating configuration of dynamic networks into firewall rules with NFT
sets.
/etc/systemd/network/eth.network
```
[DHCPv4]
...
NFTSet=netdev:filter:eth_ipv4_address
```
```
table netdev filter {
set eth_ipv4_address {
type ipv4_addr
flags interval
}
chain eth_ingress {
type filter hook ingress device "eth0" priority filter; policy drop;
ip saddr != @eth_ipv4_address drop
accept
}
}
```
```
sudo nft list set netdev filter eth_ipv4_address
table netdev filter {
set eth_ipv4_address {
type ipv4_addr
flags interval
elements = { 10.0.0.0/24 }
}
}
```
New directive `NetLabel=` provides a method for integrating dynamic network
configuration into Linux NetLabel subsystem rules, used by Linux security
modules (LSMs) for network access control. The option expects a whitespace
separated list of NetLabel labels. The labels must conform to lexical
restrictions of LSM labels. When an interface is configured with IP addresses,
the addresses and subnetwork masks will be appended to the NetLabel Fallback
Peer Labeling rules. They will be removed when the interface is
deconfigured. Failures to manage the labels will be ignored.
Example:
```
[DHCP]
NetLabel=system_u:object_r:localnet_peer_t:s0
```
With the above rules for interface `eth0`, when the interface is configured with
an IPv4 address of 10.0.0.0/8, `systemd-networkd` performs the equivalent of
`netlabelctl` operation
```
$ sudo netlabelctl unlbl add interface eth0 address:10.0.0.0/8 label:system_u:object_r:localnet_peer_t:s0
```
Result:
```
$ sudo netlabelctl -p unlbl list
...
interface: eth0
address: 10.0.0.0/8
label: "system_u:object_r:localnet_peer_t:s0"
...
```
All wiki pages that contain a deprecation banner
pointing to systemd.io or manpages are updated to
point to their replacements directly.
Helpful command for identification of available links:
git grep freedesktop.org/wiki | \
sed "s#.*\(https://www.freedesktop.org/wiki[^ $<'\\\")]*\)\(.*\)#\\1#" | \
sort | uniq
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=43942 is a simple case
where a repeated entry generates a timeout. I didn't import that case, but
generated a simpler one by hand.
$ time build/fuzz-etc-hosts test/fuzz/fuzz-etc-hosts/timeout-many-entries
test/fuzz/fuzz-etc-hosts/timeout-many-entries... ok
build/fuzz-etc-hosts test/fuzz/fuzz-etc-hosts/timeout-many-entries 3.17s (old)
↓
build/fuzz-etc-hosts test/fuzz/fuzz-etc-hosts/timeout-many-entries 0.11s (new)
I considered simply disallowing too many aliases. E.g. microsoft appearently
sometimes ignores entries after the ninth [1], and other systems set stringent
limits [2,3], but the recommended way to get around that is to simply use more
lines (as is done in the sample), so this wouldn't change anything.
Even if we cannot put all those names in a reply packet, the resolution from
the alias to the address should work. I think cases where people define lots
and lots of aliases through some programmatic interface is realistic, for
example for a blocklist, and such a file shouldn't bring resolved down to its
knees.
[1] https://superuser.com/questions/932112/is-there-a-maximum-number-of-hostname-aliases-per-line-in-a-windows-hosts-file
[2] https://library.netapp.com/ecmdocs/ECMP1516135/html/GUID-C6F3B6D1-232D-44BB-A76C-3304C19607A3.html
[3] https://www.ibm.com/docs/en/zos/2.1.0?topic=optional-creating-etchosts
We canonicalize repeats that cover the whole range: "0:0:0/1" → "0:0:*". But
we'd also do "0:0:0/1,0" → "0:0:*,0", which we then refuse to parse. Thus,
first go throug the whole chain, and print a '*' and nothing else if any of the
components covers the whole range.
0..3 is not the same as 0..infinity, we need to check both ends of the range.
This logic was added in 3215e35c40, and back then
the field was called .value. .stop was added later and apparently wasn't taken
into account here.
Coverage data shows that we didn't test calendar_spec_next_usec() and
associated functions at all.
The input samples so far were only used until the first NUL. We take advantage
of that by using the part until the second NUL as the starting timestamp,
retaining backwards compatibility for how the first part is used.
Those long indentifiers make test output very wide, and they are ultimately
not very useful for humans to look at. Let's use some short string to identify
the test failure instead.
"meson test" uses a test name generated from the file name and those long names
cause the test log output to exceed terminal width which looks bad. Let's replace
some long names with more-meaningful names that actually say something about
the tests.
Add support for managing and configuring watchdog pretimeout values if
the watchdog hardware supports it. The ping interval is adjusted to
account for a pretimeout so that it will still ping at half the timeout
interval before a pretimeout event would be triggered. By default the
pretimeout defaults to 0s or disabled.
The RuntimeWatchdogPreSec config option is added to allow the pretimeout
to be specified (similar to RuntimeWatchdogSec). The
RuntimeWatchdogPreUSec dbus property is added to override the pretimeout
value at runtime (similar to RuntimeWatchdogUSec). Setting the
pretimeout to 0s will disable the pretimeout.
