| 1 | /* Check CET compatibility with legacy JIT engine via GLIBC_TUNABLES. |
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| 2 | Copyright (C) 2021-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <stdio.h> |
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| 20 | #include <stdlib.h> |
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| 21 | #include <sys/mman.h> |
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| 22 | #include <support/test-driver.h> |
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| 23 | #include <support/xunistd.h> |
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| 24 | |
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| 25 | /* Check that mmapped legacy code won't trigger segfault with |
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| 26 | -fcf-protection and GLIBC_TUNABLES=glibc.cpu.hwcaps=-IBT,-SHSTK. */ |
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| 27 | |
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| 28 | static int |
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| 29 | do_test (void) |
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| 30 | { |
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| 31 | void (*funcp) (void); |
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| 32 | funcp = xmmap (NULL, length: 0x1000, PROT_EXEC | PROT_READ | PROT_WRITE, |
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| 33 | MAP_ANONYMOUS | MAP_PRIVATE, fd: -1); |
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| 34 | printf (format: "mmap = %p\n" , funcp); |
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| 35 | /* Write RET instruction. */ |
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| 36 | *(char *) funcp = 0xc3; |
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| 37 | funcp (); |
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| 38 | return EXIT_SUCCESS; |
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| 39 | } |
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| 40 | |
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| 41 | #include <support/test-driver.c> |
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| 42 | |
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