hide kernel addresses in /proc

[ipfire-2.x.git] / config / etc / sysctl.conf

diff --git a/config/etc/sysctl.conf b/config/etc/sysctl.conf
index e2e3d81b032ab1877e6c76e0136b8be165b23775..011c4287ea04f7194548ac9a27e88b9e2701bf53 100644 (file)
--- a/config/etc/sysctl.conf
+++ b/config/etc/sysctl.conf
@@ -1,6 +1,9 @@
 net.ipv4.ip_forward = 1
 net.ipv4.ip_dynaddr = 1
 
+# Disable Path MTU Discovery
+net.ipv4.ip_no_pmtu_disc = 1
+
 net.ipv4.icmp_echo_ignore_broadcasts = 1
 net.ipv4.icmp_ignore_bogus_error_responses = 1
 net.ipv4.icmp_ratelimit = 1000
@@ -34,3 +37,14 @@ net.ipv6.conf.default.disable_ipv6 = 1
 
 # Enable netfilter accounting
 net.netfilter.nf_conntrack_acct=1
+
+# Disable netfilter on bridges.
+net.bridge.bridge-nf-call-ip6tables = 0
+net.bridge.bridge-nf-call-iptables = 0
+net.bridge.bridge-nf-call-arptables = 0
+
+# Try to keep kernel address exposures out of various /proc files (kallsyms, modules, etc).
+kernel.kptr_restrict = 1
+
+# Avoid kernel memory address exposures via dmesg.
+kernel.dmesg_restrict = 1