man: fix link markup

[thirdparty/systemd.git] / sysctl.d / 50-default.conf

diff --git a/sysctl.d/50-default.conf b/sysctl.d/50-default.conf
index f08f32e8493a9b50865ca27e3808d634f5441173..14378b24af10b4e57bc9094ef7a3dee4d5d397f3 100644 (file)
--- a/sysctl.d/50-default.conf
+++ b/sysctl.d/50-default.conf
@@ -14,23 +14,35 @@
 # System Request functionality of the kernel (SYNC)
 #
 # Use kernel.sysrq = 1 to allow all keys.
-# See http://fedoraproject.org/wiki/QA/Sysrq for a list of values and keys.
+# See https://www.kernel.org/doc/html/latest/admin-guide/sysrq.html for a list
+# of values and keys.
 kernel.sysrq = 16
 
 # Append the PID to the core filename
 kernel.core_uses_pid = 1
 
 # Source route verification
-net.ipv4.conf.default.rp_filter = 1
-net.ipv4.conf.all.rp_filter = 1
+net.ipv4.conf.default.rp_filter = 2
+net.ipv4.conf.*.rp_filter = 2
+-net.ipv4.conf.all.rp_filter
 
 # Do not accept source routing
 net.ipv4.conf.default.accept_source_route = 0
-net.ipv4.conf.all.accept_source_route = 0
+net.ipv4.conf.*.accept_source_route = 0
+-net.ipv4.conf.all.accept_source_route
 
 # Promote secondary addresses when the primary address is removed
 net.ipv4.conf.default.promote_secondaries = 1
-net.ipv4.conf.all.promote_secondaries = 1
+net.ipv4.conf.*.promote_secondaries = 1
+-net.ipv4.conf.all.promote_secondaries
+
+# ping(8) without CAP_NET_ADMIN and CAP_NET_RAW
+# The upper limit is set to 2^31-1. Values greater than that get rejected by
+# the kernel because of this definition in linux/include/net/ping.h:
+#   #define GID_T_MAX (((gid_t)~0U) >> 1)
+# That's not so bad because values between 2^31 and 2^32-1 are reserved on
+# systemd-based systems anyway: https://systemd.io/UIDS-GIDS.html#summary
+-net.ipv4.ping_group_range = 0 2147483647
 
 # Fair Queue CoDel packet scheduler to fight bufferbloat
 net.core.default_qdisc = fq_codel
@@ -38,3 +50,7 @@ net.core.default_qdisc = fq_codel
 # Enable hard and soft link protection
 fs.protected_hardlinks = 1
 fs.protected_symlinks = 1
+
+# Enable regular file and FIFO protection
+fs.protected_regular = 1
+fs.protected_fifos = 1