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