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6c4009 |
/* Handle symbol and library versioning.
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Copyright (C) 1997-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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6c4009 |
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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6c4009 |
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6c4009 |
The GNU C Library is free software; you can redistribute it and/or
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6c4009 |
modify it under the terms of the GNU Lesser General Public
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6c4009 |
License as published by the Free Software Foundation; either
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6c4009 |
version 2.1 of the License, or (at your option) any later version.
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6c4009 |
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6c4009 |
The GNU C Library is distributed in the hope that it will be useful,
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6c4009 |
but WITHOUT ANY WARRANTY; without even the implied warranty of
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6c4009 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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6c4009 |
Lesser General Public License for more details.
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6c4009 |
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6c4009 |
You should have received a copy of the GNU Lesser General Public
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6c4009 |
License along with the GNU C Library; if not, see
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6c4009 |
<http://www.gnu.org/licenses/>. */
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6c4009 |
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6c4009 |
#include <elf.h>
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6c4009 |
#include <errno.h>
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6c4009 |
#include <libintl.h>
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6c4009 |
#include <stdlib.h>
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6c4009 |
#include <string.h>
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6c4009 |
#include <ldsodefs.h>
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6c4009 |
#include <_itoa.h>
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6c4009 |
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6c4009 |
#include <assert.h>
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6c4009 |
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6c4009 |
static inline struct link_map *
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6c4009 |
__attribute ((always_inline))
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6c4009 |
find_needed (const char *name, struct link_map *map)
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6c4009 |
{
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6c4009 |
struct link_map *tmap;
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6c4009 |
unsigned int n;
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6c4009 |
|
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6c4009 |
for (tmap = GL(dl_ns)[map->l_ns]._ns_loaded; tmap != NULL;
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6c4009 |
tmap = tmap->l_next)
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6c4009 |
if (_dl_name_match_p (name, tmap))
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6c4009 |
return tmap;
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6c4009 |
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6c4009 |
/* The required object is not in the global scope, look to see if it is
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6c4009 |
a dependency of the current object. */
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6c4009 |
for (n = 0; n < map->l_searchlist.r_nlist; n++)
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6c4009 |
if (_dl_name_match_p (name, map->l_searchlist.r_list[n]))
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6c4009 |
return map->l_searchlist.r_list[n];
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|
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6c4009 |
|
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6c4009 |
/* Should never happen. */
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|
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6c4009 |
return NULL;
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6c4009 |
}
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6c4009 |
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6c4009 |
|
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6c4009 |
static int
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6c4009 |
match_symbol (const char *name, Lmid_t ns, ElfW(Word) hash, const char *string,
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6c4009 |
struct link_map *map, int verbose, int weak)
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6c4009 |
{
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const char *strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]);
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6c4009 |
ElfW(Addr) def_offset;
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6c4009 |
ElfW(Verdef) *def;
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6c4009 |
/* Initialize to make the compiler happy. */
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|
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6c4009 |
int result = 0;
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6c4009 |
struct dl_exception exception;
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6c4009 |
|
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6c4009 |
/* Display information about what we are doing while debugging. */
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6c4009 |
if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_VERSIONS))
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6c4009 |
_dl_debug_printf ("\
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6c4009 |
checking for version `%s' in file %s [%lu] required by file %s [%lu]\n",
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6c4009 |
string, DSO_FILENAME (map->l_name),
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6c4009 |
map->l_ns, name, ns);
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6c4009 |
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6c4009 |
if (__glibc_unlikely (map->l_info[VERSYMIDX (DT_VERDEF)] == NULL))
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6c4009 |
{
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/* The file has no symbol versioning. I.e., the dependent
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6c4009 |
object was linked against another version of this file. We
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6c4009 |
only print a message if verbose output is requested. */
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6c4009 |
if (verbose)
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6c4009 |
{
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6c4009 |
/* XXX We cannot translate the messages. */
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6c4009 |
_dl_exception_create_format
|
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6c4009 |
(&exception, DSO_FILENAME (map->l_name),
|
|
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6c4009 |
"no version information available (required by %s)", name);
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6c4009 |
goto call_cerror;
|
|
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6c4009 |
}
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6c4009 |
return 0;
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6c4009 |
}
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6c4009 |
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6c4009 |
def_offset = map->l_info[VERSYMIDX (DT_VERDEF)]->d_un.d_ptr;
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6c4009 |
assert (def_offset != 0);
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6c4009 |
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6c4009 |
def = (ElfW(Verdef) *) ((char *) map->l_addr + def_offset);
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6c4009 |
while (1)
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6c4009 |
{
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6c4009 |
/* Currently the version number of the definition entry is 1.
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6c4009 |
Make sure all we see is this version. */
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if (__builtin_expect (def->vd_version, 1) != 1)
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6c4009 |
{
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6c4009 |
char buf[20];
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6c4009 |
buf[sizeof (buf) - 1] = '\0';
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6c4009 |
/* XXX We cannot translate the message. */
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6c4009 |
_dl_exception_create_format
|
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6c4009 |
(&exception, DSO_FILENAME (map->l_name),
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|
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6c4009 |
"unsupported version %s of Verdef record",
|
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6c4009 |
_itoa (def->vd_version, &buf[sizeof (buf) - 1], 10, 0));
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6c4009 |
result = 1;
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6c4009 |
goto call_cerror;
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6c4009 |
}
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6c4009 |
|
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6c4009 |
/* Compare the hash values. */
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6c4009 |
if (hash == def->vd_hash)
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6c4009 |
{
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6c4009 |
ElfW(Verdaux) *aux = (ElfW(Verdaux) *) ((char *) def + def->vd_aux);
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6c4009 |
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6c4009 |
/* To be safe, compare the string as well. */
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if (__builtin_expect (strcmp (string, strtab + aux->vda_name), 0)
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6c4009 |
== 0)
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6c4009 |
/* Bingo! */
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6c4009 |
return 0;
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6c4009 |
}
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6c4009 |
/* If no more definitions we failed to find what we want. */
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6c4009 |
if (def->vd_next == 0)
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6c4009 |
break;
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6c4009 |
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6c4009 |
/* Next definition. */
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6c4009 |
def = (ElfW(Verdef) *) ((char *) def + def->vd_next);
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6c4009 |
}
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6c4009 |
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/* Symbol not found. If it was a weak reference it is not fatal. */
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6c4009 |
if (__glibc_likely (weak))
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{
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6c4009 |
if (verbose)
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6c4009 |
{
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6c4009 |
/* XXX We cannot translate the message. */
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6c4009 |
_dl_exception_create_format
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6c4009 |
(&exception, DSO_FILENAME (map->l_name),
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6c4009 |
"weak version `%s' not found (required by %s)", string, name);
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6c4009 |
goto call_cerror;
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6c4009 |
}
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6c4009 |
return 0;
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6c4009 |
}
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6c4009 |
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6c4009 |
/* XXX We cannot translate the message. */
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6c4009 |
_dl_exception_create_format
|
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6c4009 |
(&exception, DSO_FILENAME (map->l_name),
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6c4009 |
"version `%s' not found (required by %s)", string, name);
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6c4009 |
result = 1;
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6c4009 |
call_cerror:
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6c4009 |
_dl_signal_cexception (0, &exception, N_("version lookup error"));
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6c4009 |
_dl_exception_free (&exception);
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6c4009 |
return result;
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6c4009 |
}
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6c4009 |
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6c4009 |
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6c4009 |
int
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6c4009 |
_dl_check_map_versions (struct link_map *map, int verbose, int trace_mode)
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6c4009 |
{
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6c4009 |
int result = 0;
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6c4009 |
const char *strtab;
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6c4009 |
/* Pointer to section with needed versions. */
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6c4009 |
ElfW(Dyn) *dyn;
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6c4009 |
/* Pointer to dynamic section with definitions. */
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6c4009 |
ElfW(Dyn) *def;
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6c4009 |
/* We need to find out which is the highest version index used
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6c4009 |
in a dependecy. */
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6c4009 |
unsigned int ndx_high = 0;
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6c4009 |
struct dl_exception exception;
|
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6c4009 |
/* Initialize to make the compiler happy. */
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6c4009 |
int errval = 0;
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6c4009 |
|
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Packit |
6c4009 |
/* If we don't have a string table, we must be ok. */
|
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6c4009 |
if (map->l_info[DT_STRTAB] == NULL)
|
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6c4009 |
return 0;
|
|
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6c4009 |
strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]);
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|
Packit |
6c4009 |
|
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6c4009 |
dyn = map->l_info[VERSYMIDX (DT_VERNEED)];
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Packit |
6c4009 |
def = map->l_info[VERSYMIDX (DT_VERDEF)];
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|
Packit |
6c4009 |
|
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Packit |
6c4009 |
if (dyn != NULL)
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6c4009 |
{
|
|
Packit |
6c4009 |
/* This file requires special versions from its dependencies. */
|
|
Packit |
6c4009 |
ElfW(Verneed) *ent = (ElfW(Verneed) *) (map->l_addr + dyn->d_un.d_ptr);
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6c4009 |
|
|
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6c4009 |
/* Currently the version number of the needed entry is 1.
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|
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6c4009 |
Make sure all we see is this version. */
|
|
Packit |
6c4009 |
if (__builtin_expect (ent->vn_version, 1) != 1)
|
|
Packit |
6c4009 |
{
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|
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6c4009 |
char buf[20];
|
|
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6c4009 |
buf[sizeof (buf) - 1] = '\0';
|
|
Packit |
6c4009 |
/* XXX We cannot translate the message. */
|
|
Packit |
6c4009 |
_dl_exception_create_format
|
|
Packit |
6c4009 |
(&exception, DSO_FILENAME (map->l_name),
|
|
Packit |
6c4009 |
"unsupported version %s of Verneed record",
|
|
Packit |
6c4009 |
_itoa (ent->vn_version, &buf[sizeof (buf) - 1], 10, 0));
|
|
Packit |
6c4009 |
call_error:
|
|
Packit |
6c4009 |
_dl_signal_exception (errval, &exception, NULL);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
while (1)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
ElfW(Vernaux) *aux;
|
|
Packit |
6c4009 |
struct link_map *needed = find_needed (strtab + ent->vn_file, map);
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|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* If NEEDED is NULL this means a dependency was not found
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6c4009 |
and no stub entry was created. This should never happen. */
|
|
Packit |
6c4009 |
assert (needed != NULL);
|
|
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6c4009 |
|
|
Packit |
6c4009 |
/* Make sure this is no stub we created because of a missing
|
|
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6c4009 |
dependency. */
|
|
Packit |
6c4009 |
if (__builtin_expect (! trace_mode, 1)
|
|
Packit |
6c4009 |
|| ! __builtin_expect (needed->l_faked, 0))
|
|
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6c4009 |
{
|
|
Packit |
6c4009 |
/* NEEDED is the map for the file we need. Now look for the
|
|
Packit |
6c4009 |
dependency symbols. */
|
|
Packit |
6c4009 |
aux = (ElfW(Vernaux) *) ((char *) ent + ent->vn_aux);
|
|
Packit |
6c4009 |
while (1)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
/* Match the symbol. */
|
|
Packit |
6c4009 |
result |= match_symbol (DSO_FILENAME (map->l_name),
|
|
Packit |
6c4009 |
map->l_ns, aux->vna_hash,
|
|
Packit |
6c4009 |
strtab + aux->vna_name,
|
|
Packit |
6c4009 |
needed->l_real, verbose,
|
|
Packit |
6c4009 |
aux->vna_flags & VER_FLG_WEAK);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Compare the version index. */
|
|
Packit |
6c4009 |
if ((unsigned int) (aux->vna_other & 0x7fff) > ndx_high)
|
|
Packit |
6c4009 |
ndx_high = aux->vna_other & 0x7fff;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (aux->vna_next == 0)
|
|
Packit |
6c4009 |
/* No more symbols. */
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Next symbol. */
|
|
Packit |
6c4009 |
aux = (ElfW(Vernaux) *) ((char *) aux + aux->vna_next);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (ent->vn_next == 0)
|
|
Packit |
6c4009 |
/* No more dependencies. */
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Next dependency. */
|
|
Packit |
6c4009 |
ent = (ElfW(Verneed) *) ((char *) ent + ent->vn_next);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* We also must store the names of the defined versions. Determine
|
|
Packit |
6c4009 |
the maximum index here as well.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
XXX We could avoid the loop by just taking the number of definitions
|
|
Packit |
6c4009 |
as an upper bound of new indeces. */
|
|
Packit |
6c4009 |
if (def != NULL)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
ElfW(Verdef) *ent;
|
|
Packit |
6c4009 |
ent = (ElfW(Verdef) *) (map->l_addr + def->d_un.d_ptr);
|
|
Packit |
6c4009 |
while (1)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
if ((unsigned int) (ent->vd_ndx & 0x7fff) > ndx_high)
|
|
Packit |
6c4009 |
ndx_high = ent->vd_ndx & 0x7fff;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (ent->vd_next == 0)
|
|
Packit |
6c4009 |
/* No more definitions. */
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
ent = (ElfW(Verdef) *) ((char *) ent + ent->vd_next);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (ndx_high > 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
/* Now we are ready to build the array with the version names
|
|
Packit |
6c4009 |
which can be indexed by the version index in the VERSYM
|
|
Packit |
6c4009 |
section. */
|
|
Packit |
6c4009 |
map->l_versions = (struct r_found_version *)
|
|
Packit |
6c4009 |
calloc (ndx_high + 1, sizeof (*map->l_versions));
|
|
Packit |
6c4009 |
if (__glibc_unlikely (map->l_versions == NULL))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
_dl_exception_create
|
|
Packit |
6c4009 |
(&exception, DSO_FILENAME (map->l_name),
|
|
Packit |
6c4009 |
N_("cannot allocate version reference table"));
|
|
Packit |
6c4009 |
errval = ENOMEM;
|
|
Packit |
6c4009 |
goto call_error;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Store the number of available symbols. */
|
|
Packit |
6c4009 |
map->l_nversions = ndx_high + 1;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Compute the pointer to the version symbols. */
|
|
Packit |
6c4009 |
map->l_versyms = (void *) D_PTR (map, l_info[VERSYMIDX (DT_VERSYM)]);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (dyn != NULL)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
ElfW(Verneed) *ent;
|
|
Packit |
6c4009 |
ent = (ElfW(Verneed) *) (map->l_addr + dyn->d_un.d_ptr);
|
|
Packit |
6c4009 |
while (1)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
ElfW(Vernaux) *aux;
|
|
Packit |
6c4009 |
aux = (ElfW(Vernaux) *) ((char *) ent + ent->vn_aux);
|
|
Packit |
6c4009 |
while (1)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
ElfW(Half) ndx = aux->vna_other & 0x7fff;
|
|
Packit |
6c4009 |
/* In trace mode, dependencies may be missing. */
|
|
Packit |
6c4009 |
if (__glibc_likely (ndx < map->l_nversions))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
map->l_versions[ndx].hash = aux->vna_hash;
|
|
Packit |
6c4009 |
map->l_versions[ndx].hidden = aux->vna_other & 0x8000;
|
|
Packit |
6c4009 |
map->l_versions[ndx].name = &strtab[aux->vna_name];
|
|
Packit |
6c4009 |
map->l_versions[ndx].filename = &strtab[ent->vn_file];
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (aux->vna_next == 0)
|
|
Packit |
6c4009 |
/* No more symbols. */
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Advance to next symbol. */
|
|
Packit |
6c4009 |
aux = (ElfW(Vernaux) *) ((char *) aux + aux->vna_next);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (ent->vn_next == 0)
|
|
Packit |
6c4009 |
/* No more dependencies. */
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Advance to next dependency. */
|
|
Packit |
6c4009 |
ent = (ElfW(Verneed) *) ((char *) ent + ent->vn_next);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* And insert the defined versions. */
|
|
Packit |
6c4009 |
if (def != NULL)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
ElfW(Verdef) *ent;
|
|
Packit |
6c4009 |
ent = (ElfW(Verdef) *) (map->l_addr + def->d_un.d_ptr);
|
|
Packit |
6c4009 |
while (1)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
ElfW(Verdaux) *aux;
|
|
Packit |
6c4009 |
aux = (ElfW(Verdaux) *) ((char *) ent + ent->vd_aux);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if ((ent->vd_flags & VER_FLG_BASE) == 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
/* The name of the base version should not be
|
|
Packit |
6c4009 |
available for matching a versioned symbol. */
|
|
Packit |
6c4009 |
ElfW(Half) ndx = ent->vd_ndx & 0x7fff;
|
|
Packit |
6c4009 |
map->l_versions[ndx].hash = ent->vd_hash;
|
|
Packit |
6c4009 |
map->l_versions[ndx].name = &strtab[aux->vda_name];
|
|
Packit |
6c4009 |
map->l_versions[ndx].filename = NULL;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (ent->vd_next == 0)
|
|
Packit |
6c4009 |
/* No more definitions. */
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
ent = (ElfW(Verdef) *) ((char *) ent + ent->vd_next);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return result;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
int
|
|
Packit |
6c4009 |
_dl_check_all_versions (struct link_map *map, int verbose, int trace_mode)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
struct link_map *l;
|
|
Packit |
6c4009 |
int result = 0;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
for (l = map; l != NULL; l = l->l_next)
|
|
Packit |
6c4009 |
result |= (! l->l_faked
|
|
Packit |
6c4009 |
&& _dl_check_map_versions (l, verbose, trace_mode));
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return result;
|
|
Packit |
6c4009 |
}
|