Bug#1140336: udev: fchownat() of /dev/kvm failed: Operation not permitted - patch for tmpfiles.c and static-nodes-permissions.conf

[Viktor Pashaiev]

Package: udev
Followup-For: Bug #1140336

Control: tags 1140336 + patch

Hi Benjamin,

I ran into the same issue with sbuild --unshare and /dev/kvm bind-mounted.

The failure is caused by dh_installtmpfiles in debhelper 14 removing the '|| true' fallback from the udev.postinst snippet. When setting permissions on static device nodes in unprivileged namespaces, fchownat() returns EPERM and systemd-tmpfiles aborts with exit code 73.

Attached is a patch that:
1. Treats ERRNO_IS_PRIVILEGE (EPERM, EACCES) as non-fatal debug in fd_set_perms() on character and block devices.
2. Changes the action prefix from 'z' to 'z-' in static-nodes-permissions.conf.in so permission errors are tolerated on static device nodes.

Also tracked in Ubuntu LP: #2160036:
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/2160036

-- 
Viktor Pashaiev
<w.paszajew at gmail.com>
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