62 lines
2.3 KiB
C
62 lines
2.3 KiB
C
/* Post-processing of a symbol produced by dlsym, dlvsym.
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Copyright (C) 1999-2022 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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/* Return the link map containing the caller address. */
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static struct link_map *
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_dl_sym_find_caller_link_map (ElfW(Addr) caller)
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{
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struct link_map *l = _dl_find_dso_for_object (caller);
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if (l != NULL)
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return l;
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else
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/* If the address is not recognized the call comes from the main
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program (we hope). */
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return GL(dl_ns)[LM_ID_BASE]._ns_loaded;
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}
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/* Translates RESULT, *REF, VALUE into a symbol address from the point
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of view of MATCH. Performs IFUNC resolution and auditing if
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necessary. If MATCH is NULL, CALLER is used to determine it. */
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static void *
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_dl_sym_post (lookup_t result, const ElfW(Sym) *ref, void *value,
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ElfW(Addr) caller, struct link_map *match)
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{
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/* Resolve indirect function address. */
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if (__glibc_unlikely (ELFW(ST_TYPE) (ref->st_info) == STT_GNU_IFUNC))
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{
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DL_FIXUP_VALUE_TYPE fixup
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= DL_FIXUP_MAKE_VALUE (result, (ElfW(Addr)) value);
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fixup = elf_ifunc_invoke (DL_FIXUP_VALUE_ADDR (fixup));
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value = (void *) DL_FIXUP_VALUE_CODE_ADDR (fixup);
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}
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#ifdef SHARED
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/* Auditing checkpoint: we have a new binding. Provide the
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auditing libraries the possibility to change the value and
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tell us whether further auditing is wanted. */
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if (__glibc_unlikely (GLRO(dl_naudit) > 0))
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{
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if (match == NULL)
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match = _dl_sym_find_caller_link_map (caller);
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_dl_audit_symbind_alt (match, ref, &value, result);
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}
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#endif
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return value;
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}
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