sysdeps/x86/tst-cet-legacy-6.c

   1 /* Check compatibility of CET-enabled executable with dlopened legacy
   2    shared object.
   3    Copyright (C) 2019-2022 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 #include <dlfcn.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <stdbool.h>
  24 #include <string.h>
  25 #include <x86intrin.h>
  26 #include <support/check.h>
  27
  28 #if defined CET_IS_PERMISSIVE || defined CET_DISABLED_BY_ENV
  29 # define CET_MAYBE_DISABLED 1
  30 #else
  31 # define CET_MAYBE_DISABLED 0
  32 #endif
  33
  34 static void
  35 do_test_1 (const char *modname, bool fail)
  36 {
  37   int (*fp) (void);
  38   void *h;
  39
  40   /* NB: dlopen should never fail on non-CET platforms.  If SHSTK is
  41      disabled, assuming IBT is also disabled.  */
  42   bool cet_enabled = _get_ssp () != 0 && !CET_MAYBE_DISABLED;
  43   if (!cet_enabled)
  44     fail = false;
  45
  46   h = dlopen (modname, RTLD_LAZY);
  47   if (h == NULL)
  48     {
  49       const char *err = dlerror ();
  50       if (fail)
  51         {
  52           if (strstr (err, "rebuild shared object with SHSTK support enabled")
  53               == NULL)
  54             FAIL_EXIT1 ("incorrect dlopen '%s' error: %s\n", modname, err);
  55
  56           return;
  57         }
  58
  59       FAIL_EXIT1 ("cannot open '%s': %s\n", modname, err);
  60     }
  61
  62   if (fail)
  63     FAIL_EXIT1 ("dlopen should have failed\n");
  64
  65   fp = dlsym (h, "test");
  66   if (fp == NULL)
  67     {
  68       printf ("cannot get symbol 'test': %s\n", dlerror ());
  69       exit (1);
  70     }
  71
  72   if (fp () != 0)
  73     {
  74       puts ("test () != 0");
  75       exit (1);
  76     }
  77
  78   dlclose (h);
  79 }
  80
  81 static int
  82 do_test (void)
  83 {
  84   do_test_1 ("tst-cet-legacy-mod-6a.so", true);
  85   do_test_1 ("tst-cet-legacy-mod-6b.so", false);
  86   return 0;
  87 }
  88
  89 #include <support/test-driver.c>