security-misc/lib/systemd/system/proc-hidepid.service

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## Copyright (C) 2012 - 2018 ENCRYPTED SUPPORT LP <adrelanos@riseup.net>
## See the file COPYING for copying conditions.
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[Unit]
Description=Mounts /proc with hidepid=2
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Documentation=https://github.com/Whonix/security-misc
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Requires=local-fs.target
After=local-fs.target
[Service]
Type=oneshot
ExecStart=/bin/mount -o remount,nosuid,nodev,noexec,hidepid=2 /proc
ProtectSystem=strict
ProtectHome=true
ProtectKernelTunables=true
ProtectKernelModules=true
ProtectControlGroups=true
PrivateTmp=true
PrivateMounts=true
PrivateDevices=true
PrivateNetwork=true
MemoryDenyWriteExecute=true
NoNewPrivileges=true
RestrictRealtime=true
SystemCallArchitectures=native
RestrictNamespaces=true
SystemCallFilter=mount munmap access read open close stat fstat lstat mmap mprotect brk rt_sigaction rt_sigprocmask execve readlink getrlimit getuid getgid geteuid getegid statfs prctl arch_prctl set_tid_address newfstatat set_robust_list openat mkdir
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[Install]
WantedBy=multi-user.target