Martin Pitt
91ff65cbd5
With `systemd.imds.network=locked`, imdsd cannot reach IMDS at all. Our sysctl.d/50-default.conf enables IPv4 reverse path filtering for all links. Locked mode adds a "prohibit" route for the IMDS address to the main table. imdsd's marked sockets use their own table, so its _requests_ get out. But IMDS's _replies_ carry no mark: the reverse path filter checks their source against the main table, finds the prohibit route, and drops them. To fix this, turn off reverse path filtering on the configured links in locked mode. The prohibit route still blocks direct access for everybody else. Caveat: This does not help where `net.ipv4.conf.all.rp_filter` is on, as the kernel applies the maximum of that and the link's setting. Ubuntu does that by default, so for now this only works out of the box on Debian, Fedora, etc. Cover that case in the tests, and expect a timeout/failure with `all.rp_filter > 0`. Fixes #44602 Signed-off-by: Martin Pitt <martin@amutable.com> (cherry picked from commit9d7ae503d9) (cherry picked from commit69d45358bf)
System and Service Manager
Details
Most documentation is available on systemd's web site.
Assorted, older, general information about systemd can be found in the systemd Wiki.
Information about build requirements is provided in the README file.
Consult our NEWS file for information about what's new in the most recent systemd versions.
Please see the Code Map for information about this repository's layout and content.
Please see the Hacking guide for information on how to hack on systemd and test your modifications.
Please see our Contribution Guidelines for more information about filing GitHub Issues and posting GitHub Pull Requests.
When preparing patches for systemd, please follow our Coding Style Guidelines.
If you are looking for support, please contact our mailing list, join our IRC channel #systemd on libera.chat or Matrix channel
Stable branches with backported patches are available in the stable repo.
We have a security bug bounty program sponsored by the Sovereign Tech Fund hosted on YesWeHack
Repositories with distribution packages built from git main are available on OBS, and also repositories with packages built from the latest stable release