stdlib/tst-empty-env.c

   1 /* Test that passing a NULL value does not hang environment traversal in
   2    tunables.
   3    Copyright (C) 2017-2022 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 /* The test is useful only when the source is configured with
  21    --enable-hardcoded-path-in-tests since otherwise the execve just picks up
  22    the system dynamic linker.  */
  23
  24 #include <stdlib.h>
  25 #include <stdio.h>
  26 #include <unistd.h>
  27 #include <errno.h>
  28
  29 static int
  30 do_test (int argc, char **argv)
  31 {
  32   if (argc == 2)
  33     return 0;
  34
  35   char envname[] = "FOOBAR";
  36   char *filename = program_invocation_name;
  37   char *newargv[] = {filename, filename, NULL};
  38   char *newenviron[] = {envname, NULL};
  39
  40    /* This was reported in Fedora:
  41
  42       https://bugzilla.redhat.com/show_bug.cgi?id=1414589
  43
  44       If one of the environment variables has no value, then the environment
  45       traversal must skip and also advance to the next environment entry.  The
  46       bug in question would cause this test to hang in an infinite loop.  */
  47   int ret = execve (filename, newargv, newenviron);
  48
  49   if (ret != 0)
  50     printf ("execve failed: %m");
  51
  52   /* We will reach here only if we fail execve.  */
  53   return 1;
  54 }
  55
  56 #define TEST_FUNCTION_ARGV do_test
  57 #include <support/test-driver.c>