Implement umask_override

def_data.c

@@ -310,6 +310,10 @@ struct sudo_defs_types sudo_defs_table[] = {
 	"fast_glob", T_FLAG,
 	"Use faster globbing that is less accurate but does not access the filesystem",
 	NULL,
+    }, {
+	"umask_override", T_FLAG,
+	"The umask specified in sudoers will override the user's, even if it is more permissive",
+	NULL,
     }, {
 	NULL, 0, NULL
     }

def_data.h

@@ -142,6 +142,8 @@
 #define I_PWFEEDBACK            70
 #define def_fast_glob           (sudo_defs_table[71].sd_un.flag)
 #define I_FAST_GLOB             71
+#define def_umask_override      (sudo_defs_table[72].sd_un.flag)
+#define I_UMASK_OVERRIDE        72
 
 enum def_tupple {
 	never,

def_data.in

@@ -229,3 +229,6 @@ pwfeedback
 fast_glob
 	T_FLAG
 	"Use faster globbing that is less accurate but does not access the filesystem"
+umask_override
+	T_FLAG
+	"The umask specified in sudoers will override the user's, even if it is more permissive"

sudo.c

@@ -453,14 +453,19 @@ main(argc, argv, envp)
 	    exit(rc);
 
 	/*
-	 * Override user's umask if configured to do so.
-	 * If user's umask is more restrictive, OR in those bits too.
+	 * Set umask based on sudoers.
+	 * If user's umask is more restrictive, OR in those bits too
+	 * unless umask_override is set.
 	 */
 	if (def_umask != 0777) {
-	    mode_t mask = umask(def_umask);
-	    mask |= def_umask;
-	    if (mask != def_umask)
-		umask(mask);
+	    if (def_umask_override) {
+		umask(def_umask);
+	    } else {
+		mode_t mask = umask(def_umask);
+		mask |= def_umask;
+		if (mask != def_umask)
+		    umask(mask);
+	    }
 	}
 
 	/* Restore coredumpsize resource limit. */
@@ -537,7 +542,8 @@ main(argc, argv, envp)
 	    NewArgv[0] = "sh";
 	    NewArgv[1] = safe_cmnd;
 	    execv(_PATH_BSHELL, NewArgv);
-	} warning("unable to execute %s", safe_cmnd);
+	}
+	warning("unable to execute %s", safe_cmnd);
 	exit(127);
     } else if (ISSET(validated, FLAG_NO_USER | FLAG_NO_HOST)) {
 	audit_failure(NewArgv, "No user or host");

sudoers.pod

@@ -781,6 +781,15 @@ the user running it.  With this flag enabled, B<sudo> will use a
 file named for the tty the user is logged in on in that directory.
 This flag is I<@tty_tickets@> by default.
 
+=item umask_override
+
+If set, B<sudo> will set the umask as specified by I<sudoers> without
+modification.  This makes it possible to specify a more permissive
+umask in I<sudoers> than the user's own umask and matches historical
+behavior.  If I<umask_override> is not set, B<sudo> will set the
+umask to be the union of the user's umask and what is specified in
+I<sudoers>.  This flag is I<off> by default.
+
 =item use_loginclass
 
 If set, B<sudo> will apply the defaults specified for the target user's