Re: systemd-journald.service not using ProtectSystem=strict?

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Hello,

I have no problems using this with Debian testing:

# /etc/systemd/system/systemd-journald.service.d/override.conf
[Service]
CapabilityBoundingSet=~CAP_MAC_OVERRIDE CAP_SYS_PTRACE
InaccessiblePaths=-/dev/pts -/dev/shm -/dev/mqueue -/dev/hugepages -/setuid -/boot -/tmp -/var/tmp -/bin -/sbin -/usr/bin -/run/lock -/lost+found -/media -/mnt -/opt -/srv -/proc/bus
Personality=x86-64
PrivateNetwork=yes
ProtectControlGroups=yes
ProtectHome=yes
ProtectKernelModules=yes
ProtectKernelTunables=yes
ProtectSystem=strict
ReadOnlyPaths=-/
ReadWritePaths=-/var -/run
SystemCallFilter=~@resources
UMask=0077

It could be obvious, but when testing journald configuration, if journald is started from initramfs, the config file should be also present there.

-Topi

On 10.1.2019 20.06, Reindl Harald wrote:
looking at the current security issues and  how it triggers the
troll-army i wonder why systemd-journald.service  is not restricted from
at least write to /usr and /root at least on Fedora 28 (that it's not
vulernable because of compiler hardening is just luck)

[root@testserver:~]$ cat
/etc/systemd/system/systemd-journald.service.d/security.conf
[Service]
ProtectSystem=strict
ProtectHome=yes
ReadWritePaths=/run
ReadWritePaths=/var

[root@testserver:~]$ systemctl status systemd-journald.service
● systemd-journald.service - Journal Service
    Loaded: loaded (/usr/lib/systemd/system/systemd-journald.service;
static; vendor preset: disabled)
   Drop-In: /etc/systemd/system/systemd-journald.service.d
            └─security.conf
    Active: active (running) since Thu 2019-01-10 19:00:30 CET; 42s ago
      Docs: man:systemd-journald.service(8)
            man:journald.conf(5)
  Main PID: 398 (systemd-journal)
    Status: "Processing requests..."
     Tasks: 1 (limit: 512)
    Memory: 4.7M
    CGroup: /system.slice/systemd-journald.service
            └─398 /usr/lib/systemd/systemd-journald

Jan 10 19:00:30 testserver.rhsoft.net systemd-journald[398]: Journal started
Jan 10 19:00:30 testserver.rhsoft.net systemd-journald[398]: Runtime
journal (/run/log/journal/b3591cfc6c4e65ea231a7d08489dc40f) is 2.5M, max
10.0M, 7.5M free.
Jan 10 19:00:30 testserver.rhsoft.net systemd-journald[398]: Runtime
journal (/run/log/journal/b3591cfc6c4e65ea231a7d08489dc40f) is 2.5M, max
10.0M, 7.5M free.
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