1 files changed, 79 insertions, 0 deletions
diff --git a/nptl/tst-setgroups.c b/nptl/tst-setgroups.c
new file mode 100644
index 0000000000..ae3c1b1ba0
--- /dev/null
+++ b/nptl/tst-setgroups.c
@@ -0,0 +1,79 @@
+/* Test setgroups as root and in the presence of threads (Bug 26248)
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C 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.
+
+   The GNU C 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 the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <stdlib.h>
+#include <limits.h>
+#include <grp.h>
+#include <errno.h>
+#include <error.h>
+#include <support/xthread.h>
+#include <support/support.h>
+#include <support/test-driver.h>
+#include <support/xunistd.h>
+
+/* The purpose of this test is to test the setgroups API as root and in
+   the presence of threads.  Once we create a thread the setgroups
+   implementation must ensure that all threads are set to the same
+   group and this operation should not fail. Lastly we test setgroups
+   with a zero sized group and a bad address and verify we get EPERM.  */
+
+static void *
+start_routine (void *args)
+{
+  return NULL;
+}
+
+static int
+do_test (void)
+{
+  int size;
+  /* NB: Stack address can be at 0xfffXXXXX on 32-bit OSes.  */
+  gid_t list[NGROUPS_MAX];
+  int status = EXIT_SUCCESS;
+
+  pthread_t thread = xpthread_create (NULL, start_routine, NULL);
+
+  size = getgroups (sizeof (list) / sizeof (list[0]), list);
+  if (size < 0)
+    {
+      status = EXIT_FAILURE;
+      error (0, errno, "getgroups failed");
+    }
+  if (setgroups (size, list) < 0)
+    {
+      if (errno == EPERM)
+	status = EXIT_UNSUPPORTED;
+      else
+	{
+	  status = EXIT_FAILURE;
+	  error (0, errno, "setgroups failed");
+	}
+    }
+
+  if (status == EXIT_SUCCESS && setgroups (0, list) < 0)
+    {
+      status = EXIT_FAILURE;
+      error (0, errno, "setgroups failed");
+    }
+
+  xpthread_join (thread);
+
+  return status;
+}
+
+#include <support/test-driver.c>