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52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
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/* Check DTAUDIT and vDSO interaction.
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Copyright (C) 2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <link.h>
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#include <inttypes.h>
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#include <stdbool.h>
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#include <string.h>
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#include <stdio.h>
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#include <sys/auxv.h>
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static inline bool
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startswith (const char *str, const char *pre)
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{
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size_t lenpre = strlen (pre);
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size_t lenstr = strlen (str);
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return lenstr < lenpre ? false : memcmp (pre, str, lenpre) == 0;
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}
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unsigned int
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la_version (unsigned int version)
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{
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return LAV_CURRENT;
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}
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unsigned int
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la_objopen (struct link_map *map, Lmid_t lmid, uintptr_t *cookie)
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{
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/* The linux-gate.so is placed at a fixed address, thus l_addr being 0,
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and it might be the value reported as the AT_SYSINFO_EHDR. */
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if (map->l_addr == 0 && startswith (map->l_name, "linux-gate.so"))
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fprintf (stderr, "vdso found: %p\n", NULL);
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else if (map->l_addr == getauxval (AT_SYSINFO_EHDR))
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fprintf (stderr, "vdso found: %p\n", (void*) map->l_addr);
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return 0;
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}
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