| 1 | /* Check compatibility of CET-enabled executable with dlopened legacy |
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| 2 | shared object. |
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| 3 | Copyright (C) 2019-2024 Free Software Foundation, Inc. |
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| 4 | This file is part of the GNU C Library. |
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| 5 | |
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| 6 | The GNU C Library is free software; you can redistribute it and/or |
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| 7 | modify it under the terms of the GNU Lesser General Public |
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| 8 | License as published by the Free Software Foundation; either |
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| 9 | version 2.1 of the License, or (at your option) any later version. |
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| 10 | |
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| 11 | The GNU C Library is distributed in the hope that it will be useful, |
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | Lesser General Public License for more details. |
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| 15 | |
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| 16 | You should have received a copy of the GNU Lesser General Public |
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| 17 | License along with the GNU C Library; if not, see |
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| 18 | <https://www.gnu.org/licenses/>. */ |
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| 19 | |
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| 20 | #include <dlfcn.h> |
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| 21 | #include <stdio.h> |
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| 22 | #include <stdlib.h> |
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| 23 | #include <stdbool.h> |
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| 24 | #include <string.h> |
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| 25 | #include <x86intrin.h> |
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| 26 | #include <support/check.h> |
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| 27 | |
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| 28 | #if defined CET_IS_PERMISSIVE || defined CET_DISABLED_BY_ENV |
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| 29 | # define CET_MAYBE_DISABLED 1 |
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| 30 | #else |
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| 31 | # define CET_MAYBE_DISABLED 0 |
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| 32 | #endif |
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| 33 | |
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| 34 | static void |
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| 35 | do_test_1 (const char *modname, bool fail) |
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| 36 | { |
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| 37 | int (*fp) (void); |
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| 38 | void *h; |
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| 39 | |
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| 40 | /* NB: dlopen should never fail on non-CET platforms. If SHSTK is |
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| 41 | disabled, assuming IBT is also disabled. */ |
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| 42 | bool cet_enabled = _get_ssp () != 0 && !CET_MAYBE_DISABLED; |
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| 43 | if (!cet_enabled) |
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| 44 | fail = false; |
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| 45 | |
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| 46 | h = dlopen (file: modname, RTLD_LAZY); |
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| 47 | if (h == NULL) |
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| 48 | { |
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| 49 | const char *err = dlerror (); |
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| 50 | if (fail) |
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| 51 | { |
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| 52 | if (strstr (err, "rebuild shared object with SHSTK support enabled" ) |
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| 53 | == NULL) |
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| 54 | FAIL_EXIT1 ("incorrect dlopen '%s' error: %s\n" , modname, err); |
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| 55 | |
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| 56 | return; |
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| 57 | } |
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| 58 | |
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| 59 | FAIL_EXIT1 ("cannot open '%s': %s\n" , modname, err); |
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| 60 | } |
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| 61 | |
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| 62 | if (fail) |
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| 63 | FAIL_EXIT1 ("dlopen should have failed\n" ); |
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| 64 | |
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| 65 | fp = dlsym (handle: h, name: "test" ); |
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| 66 | if (fp == NULL) |
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| 67 | { |
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| 68 | printf (format: "cannot get symbol 'test': %s\n" , dlerror ()); |
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| 69 | exit (1); |
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| 70 | } |
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| 71 | |
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| 72 | if (fp () != 0) |
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| 73 | { |
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| 74 | puts (s: "test () != 0" ); |
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| 75 | exit (1); |
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| 76 | } |
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| 77 | |
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| 78 | dlclose (handle: h); |
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| 79 | } |
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| 80 | |
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| 81 | static int |
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| 82 | do_test (void) |
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| 83 | { |
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| 84 | do_test_1 (modname: "tst-cet-legacy-mod-5a.so" , true); |
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| 85 | do_test_1 (modname: "tst-cet-legacy-mod-5b.so" , false); |
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| 86 | return 0; |
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| 87 | } |
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| 88 | |
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| 89 | #include <support/test-driver.c> |
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| 90 | |
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