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f0e23d34 | 1 | /* Check DTAUDIT and vDSO interaction. |
6d7e8eda | 2 | Copyright (C) 2021-2023 Free Software Foundation, Inc. |
f0e23d34 AZ |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <link.h> | |
20 | #include <inttypes.h> | |
21 | #include <stdbool.h> | |
22 | #include <string.h> | |
23 | #include <stdio.h> | |
24 | #include <sys/auxv.h> | |
25 | ||
26 | static inline bool | |
27 | startswith (const char *str, const char *pre) | |
28 | { | |
29 | size_t lenpre = strlen (pre); | |
30 | size_t lenstr = strlen (str); | |
31 | return lenstr < lenpre ? false : memcmp (pre, str, lenpre) == 0; | |
32 | } | |
33 | ||
34 | unsigned int | |
35 | la_version (unsigned int version) | |
36 | { | |
37 | return LAV_CURRENT; | |
38 | } | |
39 | ||
40 | unsigned int | |
41 | la_objopen (struct link_map *map, Lmid_t lmid, uintptr_t *cookie) | |
42 | { | |
43 | /* The linux-gate.so is placed at a fixed address, thus l_addr being 0, | |
44 | and it might be the value reported as the AT_SYSINFO_EHDR. */ | |
45 | if (map->l_addr == 0 && startswith (map->l_name, "linux-gate.so")) | |
46 | fprintf (stderr, "vdso found: %p\n", NULL); | |
47 | else if (map->l_addr == getauxval (AT_SYSINFO_EHDR)) | |
48 | fprintf (stderr, "vdso found: %p\n", (void*) map->l_addr); | |
49 | ||
50 | return 0; | |
51 | } |