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59 lines
2.2 KiB
C
59 lines
2.2 KiB
C
/* Support for STV_PROTECTED visibility. Generic version.
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Copyright (C) 2021-2023 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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#ifndef _DL_PROTECTED_H
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#define _DL_PROTECTED_H
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static inline void __attribute__ ((always_inline))
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_dl_check_protected_symbol (const char *undef_name,
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const struct link_map *undef_map,
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const ElfW(Sym) *ref,
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const struct link_map *map,
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int type_class)
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{
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if (undef_map == NULL || undef_map->l_type != lt_executable)
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return;
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if (type_class & ELF_RTYPE_CLASS_COPY)
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/* Disallow copy relocations in executable against protected
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data symbols in a shared object which needs indirect external
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access. */
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_dl_error_printf ("warning: copy relocation against non-copyable "
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"protected symbol `%s' in `%s'\n",
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undef_name, map->l_name);
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else if ((type_class & ELF_RTYPE_CLASS_PLT) && ref->st_value != 0
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&& ref->st_shndx == SHN_UNDEF)
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/* Disallow non-zero symbol values of undefined symbols in
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executable, which are used as the function pointer, against
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protected function symbols in a shared object with indirect
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external access. */
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_dl_error_printf (
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"warning: direct reference to "
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"protected function `%s' in `%s' may break pointer equality\n",
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undef_name, map->l_name);
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else
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return;
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if (map->l_1_needed & GNU_PROPERTY_1_NEEDED_INDIRECT_EXTERN_ACCESS)
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_dl_signal_error (
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0, map->l_name, undef_name,
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N_ ("error due to GNU_PROPERTY_1_NEEDED_INDIRECT_EXTERN_ACCESS"));
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}
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#endif /* _DL_PROTECTED_H */
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