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units: add a basic SystemCallFilter (#3471) 

Add a line
SystemCallFilter=~@clock @module @mount @obsolete @raw-io ptrace
for daemons shipped by systemd. As an exception, systemd-timesyncd
needs @clock system calls and systemd-localed is not privileged.
ptrace(2) is blocked to prevent seccomp escapes.
This commit is contained in:
Topi Miettinen 2016-06-09 07:32:04 +00:00 committed by Lennart Poettering
parent d9c11f2b01
commit 40093ce5dd
10 changed files with 10 additions and 0 deletions
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1
units/systemd-hostnamed.service.in
View File

@ -21,3 +21,4 @@ PrivateNetwork=yes
ProtectSystem=yes
ProtectHome=yes
MemoryDenyWriteExecute=yes
SystemCallFilter=~@clock @module @mount @obsolete @raw-io ptrace

1
units/systemd-importd.service.in
View File

@ -18,3 +18,4 @@ NoNewPrivileges=yes
WatchdogSec=3min
KillMode=mixed
MemoryDenyWriteExecute=yes
SystemCallFilter=~@clock @module @mount @obsolete @raw-io ptrace

1
units/systemd-journald.service.in
View File

@ -25,6 +25,7 @@ CapabilityBoundingSet=CAP_SYS_ADMIN CAP_DAC_OVERRIDE CAP_SYS_PTRACE CAP_SYSLOG C
WatchdogSec=3min
FileDescriptorStoreMax=1024
MemoryDenyWriteExecute=yes
SystemCallFilter=~@clock @module @mount @obsolete @raw-io ptrace
# Increase the default a bit in order to allow many simultaneous
# services being run since we keep one fd open per service. Also, when

1
units/systemd-localed.service.in
View File

@ -21,3 +21,4 @@ PrivateNetwork=yes
ProtectSystem=yes
ProtectHome=yes
MemoryDenyWriteExecute=yes
SystemCallFilter=~@clock @module @mount @obsolete @privileged @raw-io ptrace

1
units/systemd-logind.service.in
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@ -26,6 +26,7 @@ BusName=org.freedesktop.login1
CapabilityBoundingSet=CAP_SYS_ADMIN CAP_MAC_ADMIN CAP_AUDIT_CONTROL CAP_CHOWN CAP_KILL CAP_DAC_READ_SEARCH CAP_DAC_OVERRIDE CAP_FOWNER CAP_SYS_TTY_CONFIG
WatchdogSec=3min
MemoryDenyWriteExecute=yes
SystemCallFilter=~@clock @module @mount @obsolete @raw-io ptrace
# Increase the default a bit in order to allow many simultaneous
# logins since we keep one fd open per session.

1
units/systemd-machined.service.in
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@ -18,6 +18,7 @@ BusName=org.freedesktop.machine1
CapabilityBoundingSet=CAP_KILL CAP_SYS_PTRACE CAP_SYS_ADMIN CAP_SETGID CAP_SYS_CHROOT CAP_DAC_READ_SEARCH CAP_DAC_OVERRIDE CAP_CHOWN CAP_FOWNER CAP_FSETID CAP_MKNOD
WatchdogSec=3min
MemoryDenyWriteExecute=yes
SystemCallFilter=~@clock @module @mount @obsolete @raw-io ptrace
# Note that machined cannot be placed in a mount namespace, since it
# needs access to the host's mount namespace in order to implement the

1
units/systemd-networkd.service.m4.in
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@ -32,6 +32,7 @@ ProtectSystem=full
ProtectHome=yes
WatchdogSec=3min
MemoryDenyWriteExecute=yes
SystemCallFilter=~@clock @module @mount @obsolete @raw-io ptrace
[Install]
WantedBy=multi-user.target

1
units/systemd-resolved.service.m4.in
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@ -28,6 +28,7 @@ ProtectSystem=full
ProtectHome=yes
WatchdogSec=3min
MemoryDenyWriteExecute=yes
SystemCallFilter=~@clock @module @mount @obsolete @raw-io ptrace
[Install]
WantedBy=multi-user.target

1
units/systemd-timedated.service.in
View File

@ -19,3 +19,4 @@ PrivateTmp=yes
ProtectSystem=yes
ProtectHome=yes
MemoryDenyWriteExecute=yes
SystemCallFilter=~@module @mount @obsolete @raw-io ptrace

1
units/systemd-timesyncd.service.in
View File

@ -29,6 +29,7 @@ ProtectSystem=full
ProtectHome=yes
WatchdogSec=3min
MemoryDenyWriteExecute=yes
SystemCallFilter=~@module @mount @obsolete @raw-io ptrace
[Install]
WantedBy=sysinit.target