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From d9ae3222cfbd5d2a48e6dbade6617085cc76f1c1 Mon Sep 17 00:00:00 2001
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From: HATAYAMA Daisuke <d.hatayama@fujitsu.com>
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Date: Tue, 25 Feb 2020 13:35:50 -0500
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Subject: [PATCH] resolved: Recover missing PrivateTmp=yes and
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ProtectSystem=strict
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Since the commit b61e8046ebcb28225423fc0073183d68d4c577c4,
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systemd-resolved.service often fails to start with the following message:
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Failed at step NAMESPACE spawning /usr/bin/mount: Read-only file system
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This is because dropping DynamicUser=yes dropped implicit PrivateTmp=yes and
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also implicit After=systemd-tmpfiles-setup.service, and thus
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systemd-resolved.service can start before systemd-remount-fs.service. As a
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result, mount operations associated with PrivateDevices= can be performed to
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still read-only filesystems.
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To fix this issue, it's better to recover PrivateTmp=yes and
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ProtectSystem=strict just as the upstream commit
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62fb7e80fcc45a1530ed58a84980be8cfafa9b3e (Revert "resolve: enable DynamicUser=
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for systemd-resolved.service").
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Resolves: #1810869
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---
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units/systemd-resolved.service.in | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/units/systemd-resolved.service.in b/units/systemd-resolved.service.in
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index 6c2ad5ca86..aad1a53a5f 100644
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--- a/units/systemd-resolved.service.in
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+++ b/units/systemd-resolved.service.in
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@@ -28,7 +28,9 @@ WatchdogSec=3min
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User=systemd-resolve
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CapabilityBoundingSet=CAP_SETPCAP CAP_NET_RAW CAP_NET_BIND_SERVICE
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AmbientCapabilities=CAP_SETPCAP CAP_NET_RAW CAP_NET_BIND_SERVICE
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+PrivateTmp=yes
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PrivateDevices=yes
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+ProtectSystems=strict
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ProtectHome=yes
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ProtectControlGroups=yes
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ProtectKernelTunables=yes
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