Bug#1078331: systemd: All non-default Journal Namespaces read from /dev/kmem

[F. Stoyan]

Package: systemd
Version: 252.29-1~deb12u1
Severity: normal

Dear Maintainer,

the manual page journald.conf(5) states very clearly:

  ReadKMsg=
    Takes a boolean value. If enabled systemd-journal processes /dev/kmsg
    messages generated by the kernel. In the default journal namespace
    this option is enabled by default, it is disabled in all others.

But, every time a non default journal namespace is spawnd, it
complains very loudly:

Aug 07 16:30:55 systemd[1]: Starting systemd-journald at bulk.service - Journal Service for Namespace bulk...
Aug 07 16:30:55 systemd-journald[2081]: Failed to open /dev/kmsg, ignoring: Operation not permitted
Aug 07 16:30:55 systemd[1]: Started systemd-journald at bulk.service - Journal Service for Namespace bulk.
Aug 07 16:31:25 systemd[1]: systemd-journald at bulk.service: Deactivated successfully.

The namespace configuration is at follows:

$ systemd-analyze cat-config systemd/journald at bulk.conf
# /etc/systemd/journald at bulk.conf
# Use 'systemd-analyze cat-config systemd/journald at bulk.conf' to display the full config.
# See journald.conf(5) for details.

[Journal]
Storage=volatile
RuntimeMaxUse=16M
ReadKMsg=no

It does not matter whether "ReadKMsg=no" is configured or not,
it does not change the behavior.

-- Package-specific info:

-- System Information:
Debian Release: 12.6
  APT prefers stable-security
  APT policy: (500, 'stable-security'), (500, 'proposed-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.1.0-23-amd64 (SMP w/12 CPU threads; PREEMPT)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages systemd depends on:
ii  libacl1            2.3.1-3
ii  libaudit1          1:3.0.9-1
ii  libblkid1          2.38.1-5+deb12u1
ii  libc6              2.36-9+deb12u7
ii  libcap2            1:2.66-4
ii  libcryptsetup12    2:2.6.1-4~deb12u2
ii  libfdisk1          2.38.1-5+deb12u1
ii  libgcrypt20        1.10.1-3
ii  libkmod2           30+20221128-1
ii  liblz4-1           1.9.4-1
ii  liblzma5           5.4.1-0.2
ii  libmount1          2.38.1-5+deb12u1
ii  libp11-kit0        0.24.1-2
ii  libseccomp2        2.5.4-1+deb12u1
ii  libselinux1        3.4-1+b6
ii  libssl3            3.0.13-1~deb12u1
ii  libsystemd-shared  252.29-1~deb12u1
ii  libsystemd0        252.29-1~deb12u1
ii  libzstd1           1.5.4+dfsg2-5
ii  mount              2.38.1-5+deb12u1

Versions of packages systemd recommends:
ii  chrony [time-daemon]            4.3-2+deb12u1
ii  dbus [default-dbus-system-bus]  1.14.10-1~deb12u1

Versions of packages systemd suggests:
ii  libfido2-1             1.12.0-2+b1
pn  libqrencode4           <none>
pn  libtss2-esys-3.0.2-0   <none>
pn  libtss2-mu0            <none>
pn  libtss2-rc0            <none>
pn  polkitd | policykit-1  <none>
pn  systemd-boot           <none>
pn  systemd-container      <none>
pn  systemd-homed          <none>
pn  systemd-resolved       <none>
pn  systemd-userdbd        <none>

Versions of packages systemd is related to:
pn  dbus-user-session  <none>
pn  dracut             <none>
ii  initramfs-tools    0.142
pn  libnss-systemd     <none>
ii  libpam-systemd     252.29-1~deb12u1
ii  udev               252.29-1~deb12u1

-- no debconf information