projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d0093c5c L |
1 | /* Check compatibility of CET-enabled executable with dlopened legacy |
| 2 | shared object. | |
| 2b778ceb | 3 | Copyright (C) 2019-2021 Free Software Foundation, Inc. |
| d0093c5c L |
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 | |
| 5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
| d0093c5c L |
19 | |
| 20 | #include <dlfcn.h> | |
| 21 | #include <stdio.h> | |
| 22 | #include <stdlib.h> | |
| 23 | #include <stdbool.h> | |
| 24 | #include <string.h> | |
| 9e38f455 L |
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 | |
| d0093c5c L |
33 | |
| 34 | static void | |
| 35 | do_test_1 (const char *modname, bool fail) | |
| 36 | { | |
| 37 | int (*fp) (void); | |
| 38 | void *h; | |
| 39 | ||
| 40 | h = dlopen (modname, RTLD_LAZY); | |
| 41 | if (h == NULL) | |
| 42 | { | |
| 9e38f455 | 43 | const char *err = dlerror (); |
| d0093c5c L |
44 | if (fail) |
| 45 | { | |
| 1fabdb99 L |
46 | if (strstr (err, "rebuild shared object with SHSTK support enabled") |
| 47 | == NULL) | |
| 9e38f455 | 48 | FAIL_EXIT1 ("incorrect dlopen '%s' error: %s\n", modname, err); |
| d0093c5c L |
49 | |
| 50 | return; | |
| 51 | } | |
| 52 | ||
| 9e38f455 | 53 | FAIL_EXIT1 ("cannot open '%s': %s\n", modname, err); |
| d0093c5c L |
54 | } |
| 55 | ||
| 9e38f455 L |
56 | /* NB: dlopen should never fail on non-CET platforms. If SHSTK is |
| 57 | disabled, assuming IBT is also disabled. */ | |
| 58 | bool cet_enabled = _get_ssp () != 0 && !CET_MAYBE_DISABLED; | |
| 59 | if (fail && cet_enabled) | |
| 60 | FAIL_EXIT1 ("dlopen should have failed\n"); | |
| 61 | ||
| d0093c5c L |
62 | fp = dlsym (h, "test"); |
| 63 | if (fp == NULL) | |
| 64 | { | |
| 65 | printf ("cannot get symbol 'test': %s\n", dlerror ()); | |
| 66 | exit (1); | |
| 67 | } | |
| 68 | ||
| 69 | if (fp () != 0) | |
| 70 | { | |
| 71 | puts ("test () != 0"); | |
| 72 | exit (1); | |
| 73 | } | |
| 74 | ||
| 75 | dlclose (h); | |
| 76 | } | |
| 77 | ||
| 78 | static int | |
| 79 | do_test (void) | |
| 80 | { | |
| 81 | do_test_1 ("tst-cet-legacy-mod-6a.so", true); | |
| 82 | do_test_1 ("tst-cet-legacy-mod-6b.so", false); | |
| 83 | return 0; | |
| 84 | } | |
| 85 | ||
| 86 | #include <support/test-driver.c> |