Add Msf::Post::Linux::Kernel lib

lib/msf/core/post/linux.rb

@@ -2,5 +2,6 @@
 module Msf::Post::Linux
   require 'msf/core/post/linux/priv'
   require 'msf/core/post/linux/system'
+  require 'msf/core/post/linux/kernel'
   require 'msf/core/post/linux/busy_box'
 end

lib/msf/core/post/linux/kernel.rb

@@ -0,0 +1,58 @@
+# -*- coding: binary -*-
+require 'msf/core/post/common'
+
+module Msf
+class Post
+module Linux
+module Kernel
+  include ::Msf::Post::Common
+
+  #
+  # Returns the kernel version
+  #
+  # @return [String]
+  #
+  def kernel_version
+    cmd_exec('uname -r').to_s
+  rescue
+    raise 'Could not determine kernel version'
+  end
+
+  #
+  # Returns true if kernel and hardware supports Supervisor Mode Access Prevention (SMAP), false if not.
+  #
+  # @return [Boolean]
+  #
+  def smap_enabled?
+    cmd_exec('cat /proc/cpuinfo').to_s.include? 'smap'
+  rescue
+    raise 'Could not determine SMAP status'
+  end
+
+  #
+  # Returns true if kernel and hardware supports Supervisor Mode Execution Protection (SMEP), false if not.
+  #
+  # @return [Boolean]
+  #
+  def smep_enabled?
+    cmd_exec('cat /proc/cpuinfo').to_s.include? 'smep'
+  rescue
+    raise 'Could not determine SMEP status'
+  end
+
+  #
+  # Returns true if user namespaces are enabled, false if not.
+  #
+  # @return [Boolean]
+  #
+  def userns_enabled?
+    return false if cmd_exec('cat /proc/sys/user/max_user_namespaces').to_s.eql? '0'
+    cmd_exec('cat /proc/sys/kernel/unprivileged_userns_clone').to_s.eql? '1'
+  rescue
+    raise 'Could not determine userns status'
+  end
+
+end # Kernel
+end # Linux
+end # Post
+end # Msf