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d1b9bee29a
The vDSO is is listed in the link_map chain, but is never the subject of
an la_objopen call. A new internal flag __RTLD_VDSO is added that
acts as __RTLD_OPENEXEC to allocate the required 'struct auditstate'
extra space for the 'struct link_map'.
The return value from the callback is currently ignored, since there
is no PLT call involved by glibc when using the vDSO, neither the vDSO
are exported directly.
Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
(cherry picked from commit f0e23d34a7)
Resolved conflicts:
elf/Makefile
52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
/* 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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