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https://github.com/libfuse/libfuse.git
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Darrick J. Wong
63336ed0d8
Create a simple fuse server that can be run as a systemd service. I plan to create some more single-file fuse server examples, so most of the boilerplate code goes in a separate file. Also suppress COMPLEX_MACRO in checkpatch, FUSE_OPT_KEY macros have to stay as they are and checkpatch annotations are not correct here. Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
103 lines
2.4 KiB
Desktop File
103 lines
2.4 KiB
Desktop File
# SPDX-License-Identifier: GPL-2.0-or-later
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#
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# Copyright (C) 2026 Oracle. All Rights Reserved.
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# Author: Darrick J. Wong <djwong@kernel.org>
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[Unit]
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Description=service_ll Sample Fuse Service
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# Don't leave failed units behind, systemd does not clean them up!
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CollectMode=inactive-or-failed
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[Service]
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Type=exec
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ExecStart=/path/to/service_ll
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# Try to capture core dumps
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LimitCORE=infinity
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SyslogIdentifier=%N
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# No realtime CPU scheduling
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RestrictRealtime=true
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# Don't let us see anything in the regular system, and don't run as root
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DynamicUser=true
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ProtectSystem=strict
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ProtectHome=true
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PrivateTmp=true
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PrivateDevices=true
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PrivateUsers=true
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# No network access
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PrivateNetwork=true
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ProtectHostname=true
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RestrictAddressFamilies=none
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IPAddressDeny=any
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# Don't let the program mess with the kernel configuration at all
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ProtectKernelLogs=true
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ProtectKernelModules=true
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ProtectKernelTunables=true
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ProtectControlGroups=true
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ProtectProc=invisible
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RestrictNamespaces=true
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RestrictFileSystems=
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# Hide everything in /proc, even /proc/mounts
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ProcSubset=pid
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# Only allow the default personality Linux
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LockPersonality=true
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# No writable memory pages
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MemoryDenyWriteExecute=true
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# Don't let our mounts leak out to the host
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PrivateMounts=true
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# Restrict system calls to the native arch and only enough to get things going
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SystemCallArchitectures=native
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SystemCallFilter=@system-service
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SystemCallFilter=~@privileged
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SystemCallFilter=~@resources
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SystemCallFilter=~@clock
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SystemCallFilter=~@cpu-emulation
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SystemCallFilter=~@debug
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SystemCallFilter=~@module
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SystemCallFilter=~@reboot
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SystemCallFilter=~@swap
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SystemCallFilter=~@mount
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# libfuse io_uring wants to pin cores and memory
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SystemCallFilter=mbind
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SystemCallFilter=sched_setaffinity
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# Leave a breadcrumb if we get whacked by the system call filter
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SystemCallErrorNumber=EL3RST
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# Log to the kernel dmesg, just like an in-kernel filesystem driver
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StandardOutput=append:/dev/ttyprintk
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StandardError=append:/dev/ttyprintk
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# Run with no capabilities at all
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CapabilityBoundingSet=
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AmbientCapabilities=
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NoNewPrivileges=true
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# We don't create files
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UMask=7777
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# No access to hardware /dev files at all
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ProtectClock=true
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DevicePolicy=closed
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# Don't mess with set[ug]id anything.
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RestrictSUIDSGID=true
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# Don't let OOM kills of processes in this containment group kill the whole
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# service, because we don't want filesystem drivers to go down.
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OOMPolicy=continue
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OOMScoreAdjust=-1000
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