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core:sandbox: add more /proc/* entries to ProtectKernelTunables=

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Make ALSA entries, latency interface, mtrr, apm/acpi, suspend interface,
filesystems configuration and IRQ tuning readonly.

Most of these interfaces now days should be in /sys but they are still
available through /proc, so just protect them. This patch does not touch
/proc/net/...
This commit is contained in:
Djalal Harouni 2016-09-25 11:30:11 +02:00
parent 9221aec8d0
commit 49accde7bd
2 changed files with 15 additions and 2 deletions
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6
man/systemd.exec.xml
View File

@ -1026,8 +1026,10 @@
<term><varname>ProtectKernelTunables=</varname></term>
<listitem><para>Takes a boolean argument. If true, kernel variables accessible through
<filename>/proc/sys</filename>, <filename>/sys</filename> and <filename>/proc/sysrq-trigger</filename> will be
made read-only to all processes of the unit. Usually, tunable kernel variables should only be written at
<filename>/proc/sys</filename>, <filename>/sys</filename>, <filename>/proc/sysrq-trigger</filename>,
<filename>/proc/latency_stats</filename>, <filename>/proc/acpi</filename>,
<filename>/proc/timer_stats</filename>, <filename>/proc/fs</filename> and <filename>/proc/irq</filename> will
be made read-only to all processes of the unit. Usually, tunable kernel variables should only be written at
boot-time, with the <citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>
mechanism. Almost no services need to write to these at runtime; it is hence recommended to turn this on for
most services. For this setting the same restrictions regarding mount propagation and privileges apply as for

11
src/core/namespace.c
View File

@ -74,7 +74,18 @@ typedef struct TargetMount {
static const TargetMount protect_kernel_tunables_table[] = {
{ "/proc/sys", READONLY, false },
{ "/proc/sysrq-trigger", READONLY, true },
{ "/proc/latency_stats", READONLY, true },
{ "/proc/mtrr", READONLY, true },
{ "/proc/apm", READONLY, true },
{ "/proc/acpi", READONLY, true },
{ "/proc/timer_stats", READONLY, true },
{ "/proc/asound", READONLY, true },
{ "/proc/bus", READONLY, true },
{ "/proc/fs", READONLY, true },
{ "/proc/irq", READONLY, true },
{ "/sys", READONLY, false },
{ "/sys/kernel/debug", READONLY, true },
{ "/sys/kernel/tracing", READONLY, true },
{ "/sys/fs/cgroup", READWRITE, false }, /* READONLY is set by ProtectControlGroups= option */
};