pppd: Make set and unset options privileged (#583)

Since the "set" and "unset" options affect the environment passed to
scripts that run as root, and environment variable settings could
affect or disrupt the execution of those scripts, these options
should be privileged.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

Author: paulusmack

pppd/options.c

@@ -334,10 +334,10 @@ struct option general_options[] = {
 
     { "set", o_special, (void *)user_setenv,
       "Set user environment variable",
-      OPT_A2PRINTER | OPT_NOPRINT, (void *)user_setprint },
+      OPT_A2PRINTER | OPT_NOPRINT | OPT_PRIV, (void *)user_setprint },
     { "unset", o_special, (void *)user_unsetenv,
       "Unset user environment variable",
-      OPT_A2PRINTER | OPT_NOPRINT, (void *)user_unsetprint },
+      OPT_A2PRINTER | OPT_NOPRINT | OPT_PRIV, (void *)user_unsetprint },
 
     { "net-init-script", o_string, path_net_init,
       "Set pathname of net-init script",