Import Upstream version 2.72.4

glib/tests/getpwuid-preload.c

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+/* GLIB - Library of useful routines for C programming
+ *
+ * Copyright (C) 2020 Red Hat, Inc.
+ *
+ * Author: Jakub Jelen <jjelen@redhat.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <dlfcn.h>
+#include <pwd.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+static struct passwd my_pw;
+
+/* This is used in gutils.c used to make sure utility functions
+ * handling user information do not crash on bad data (for example
+ * caused by getpwuid returning some NULL elements.
+ */
+struct passwd *
+getpwuid (uid_t uid)
+{
+  static struct passwd *(*real_getpwuid) (uid_t);
+  struct passwd *pw;
+
+  if (real_getpwuid == NULL)
+    real_getpwuid = dlsym (RTLD_NEXT, "getpwuid");
+
+  pw = real_getpwuid (uid);
+  my_pw = *pw;
+  my_pw.pw_name = NULL;
+  return &my_pw;
+}