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--- systems:media_server:secure_the_server:harden_linux_kernel_configuration_parameters [2025/05/31 12:11] – peter
+++ systems:media_server:secure_the_server:harden_linux_kernel_configuration_parameters [2025/05/31 16:07] (current) – peter
@@ Line 3: / Line 3: @@
 The Linux kernel is flexible, and the way it works can be modified on the fly by dynamically changing some of its parameters using the **sysctl** command.
-  * **sysctl** can be used to both read and write sysctl data; i.e. it provides an interface that allows the examination and change of several hundred kernel parameters in Linux.
+  * **sysctl** allows the viewing and changing of kernel settings on a running system.
-  * Changes take effect immediately, and there is even a way to make them persist after a reboot.
     * The parameters available are those listed under /proc/sys/.
+  * Changes take effect immediately.
+  * The related **/etc/sysctl.conf** file is used to ensure that the settings persist after a reboot.
 <WRAP alert>
 **IMPORTANT NOTE:**  Editing the sysctl.conf file might break the system - this is for advanced users only.
 </WRAP>
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-====== Make a backup of the existing /etc/sysctl.conf file ======
+===== Make a backup of the existing /etc/sysctl.conf file =====
 <code bash>
@@ Line 22: / Line 22: @@
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-====== Modify the sysctl file ======
+===== Modify the sysctl file =====
 Add the following entries to the bottom of the **/etc/sysctl.conf** file to stop some spoofing attacks and enhance other security measures:
@@ Line 64: / Line 64: @@
 kernel.panic = 60
 kernel.sysrq = 0
 # File System Security
@@ Line 73: / Line 74: @@
 # Additional Security Measures
+#dev.tty.ldisc_autoload = 0
+#kernel.modules_disabled = 1
 kernel.core_uses_pid = 1
 kernel.panic_on_unrecovered_nmi = 1
@@ Line 84: / Line 87: @@
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-====== Activate the kernel settings that have been modified ======
+===== Activate the kernel settings that have been modified =====
 This reloads the sysctl parameters:
@@ Line 93: / Line 96: @@
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