Whilst rngd has to run as root, we can significantly constrain its permissions (network is only required if nistbeacon is enabled).
Signed-off-by: Alex Kiernan <alex.kier...@gmail.com> --- Changes in v2: - fix network access .../rng-tools/rng-tools/rngd.service | 19 +++++++++++++++++++ .../rng-tools/rng-tools_6.9.bb | 7 +++++++ 2 files changed, 26 insertions(+) diff --git a/meta/recipes-support/rng-tools/rng-tools/rngd.service b/meta/recipes-support/rng-tools/rng-tools/rngd.service index 084322ac40aa..0559b9799154 100644 --- a/meta/recipes-support/rng-tools/rng-tools/rngd.service +++ b/meta/recipes-support/rng-tools/rng-tools/rngd.service @@ -8,6 +8,25 @@ Conflicts=shutdown.target [Service] EnvironmentFile=-@SYSCONFDIR@/default/rng-tools ExecStart=@SBINDIR@/rngd -f $EXTRA_ARGS +CapabilityBoundingSet=CAP_SYS_ADMIN +IPAddressDeny=any +LockPersonality=yes +MemoryDenyWriteExecute=yes +NoNewPrivileges=yes +PrivateTmp=yes +ProtectControlGroups=yes +ProtectHome=yes +ProtectHostname=yes +ProtectKernelModules=yes +ProtectKernelLogs=yes +ProtectSystem=strict +RestrictAddressFamilies=AF_UNIX +RestrictNamespaces=yes +RestrictRealtime=yes +RestrictSUIDSGID=yes +SystemCallArchitectures=native +SystemCallErrorNumber=EPERM +SystemCallFilter=@system-service [Install] WantedBy=sysinit.target diff --git a/meta/recipes-support/rng-tools/rng-tools_6.9.bb b/meta/recipes-support/rng-tools/rng-tools_6.9.bb index 913342c315de..8c98a9aa3ae2 100644 --- a/meta/recipes-support/rng-tools/rng-tools_6.9.bb +++ b/meta/recipes-support/rng-tools/rng-tools_6.9.bb @@ -49,4 +49,11 @@ do_install_append() { -e 's,@SBINDIR@,${sbindir},g' \ ${D}${sysconfdir}/init.d/rng-tools \ ${D}${systemd_system_unitdir}/rngd.service + + if [ "${@bb.utils.contains('PACKAGECONFIG', 'nistbeacon', 'yes', 'no', d)}" = "yes" ]; then + sed -i \ + -e '/^IPAddressDeny=any/d' \ + -e '/^RestrictAddressFamilies=/ s/$/ AF_INET AF_INET6/' \ + ${D}${systemd_system_unitdir}/rngd.service + fi } -- 2.17.1
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