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06535ae948
* posix/unistd.h: Move declaration of __libc_enable_secure to... * include/unistd.h: ...here. * elf/dl-open.c (dl_open_worker): If DST is used in SUID program punt. * elf/dl-deps.c (expand_dst): Likewise. * elf/dynamic-link.h: Set DT_SYMBOLIC, DT_TEXTREL, and DT_BIND_NOW based on DT_FLAGS value. * elf/do-lookup.h: Remove reference_name parameter, add undef_map. Add test for symbols marked STV_HIDDEN. * elf/dl-lookup.c (_dl_lookup_symbol): Remove reference_name parameter, add undef_map. Compute reference_name locally. Update call to do_lookup. (_dl_lookup_symbol_skip): Likewise. (_dl_lookup_versioned_symbol): Likewise. (_dl_lookup_versioned_symbol_skip): Likewise. * elf/dl-libc.c: Update call to _dl_lookup_*symbol. * elf/dl-runtime.c: Likewise. * elf/dl-sym.c: Likewise. * elf/dl-symbol.c: Likewise. * elf/ldsodefs.h: Adjust prototypes. * elf/dl-reloc.c (RESOLV): Add test for STV_PROTECTED flag set and handle appropriately. Add comment about DT_TEXTREL. * elf/dl-runtime.c: Likewise.
128 lines
3.6 KiB
C
128 lines
3.6 KiB
C
/* Look up a symbol in a shared object loaded by `dlopen'.
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Copyright (C) 1999 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <stddef.h>
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#include <setjmp.h>
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#include <libintl.h>
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#include <dlfcn.h>
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#include <ldsodefs.h>
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#include <dl-hash.h>
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void *
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internal_function
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_dl_sym (void *handle, const char *name, void *who)
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{
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ElfW(Addr) loadbase;
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const ElfW(Sym) *ref = NULL;
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if (handle == RTLD_DEFAULT)
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/* Search the global scope. */
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loadbase = _dl_lookup_symbol (name, NULL, &ref, _dl_global_scope, 0);
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else if (handle == RTLD_NEXT)
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{
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struct link_map *l, *match;
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ElfW(Addr) caller = (ElfW(Addr)) who;
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/* Find the highest-addressed object that CALLER is not below. */
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match = NULL;
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for (l = _dl_loaded; l; l = l->l_next)
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if (caller >= l->l_addr && (!match || match->l_addr < l->l_addr))
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match = l;
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if (! match)
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_dl_signal_error (0, NULL, _("\
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RTLD_NEXT used in code not dynamically loaded"));
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l = match;
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while (l->l_loader)
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l = l->l_loader;
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loadbase = _dl_lookup_symbol_skip (name, l, &ref, l->l_local_scope,
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match);
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}
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else
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{
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/* Search the scope of the given object. */
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struct link_map *map = handle;
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loadbase = _dl_lookup_symbol (name, map, &ref, map->l_local_scope, 0);
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}
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if (loadbase)
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return (void *) (loadbase + ref->st_value);
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return NULL;
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}
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void *
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internal_function
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_dl_vsym (void *handle, const char *name, const char *version, void *who)
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{
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ElfW(Addr) loadbase;
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const ElfW(Sym) *ref = NULL;
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struct r_found_version vers;
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/* Compute hash value to the version string. */
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vers.name = version;
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vers.hidden = 1;
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vers.hash = _dl_elf_hash (version);
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/* We don't have a specific file where the symbol can be found. */
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vers.filename = NULL;
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if (handle == RTLD_DEFAULT)
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/* Search the global scope. */
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loadbase = _dl_lookup_versioned_symbol (name, NULL, &ref, _dl_global_scope,
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&vers, 0);
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else if (handle == RTLD_NEXT)
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{
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struct link_map *l, *match;
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ElfW(Addr) caller = (ElfW(Addr)) who;
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/* Find the highest-addressed object that CALLER is not below. */
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match = NULL;
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for (l = _dl_loaded; l; l = l->l_next)
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if (caller >= l->l_addr && (!match || match->l_addr < l->l_addr))
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match = l;
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if (! match)
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_dl_signal_error (0, NULL, _("\
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RTLD_NEXT used in code not dynamically loaded"));
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l = match;
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while (l->l_loader)
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l = l->l_loader;
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loadbase = _dl_lookup_versioned_symbol_skip (name, l, &ref,
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l->l_local_scope,
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&vers, match);
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}
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else
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{
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/* Search the scope of the given object. */
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struct link_map *map = handle;
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loadbase = _dl_lookup_versioned_symbol (name, map, &ref,
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map->l_local_scope, &vers, 0);
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}
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if (loadbase)
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return (void *) (loadbase + ref->st_value);
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return NULL;
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}
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