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349b0441da
When performing symbol lookup for references in executable without indirect external access: 1. Disallow copy relocations in executable against protected data symbols in a shared object with indirect external access. 2. Disallow non-zero symbol values of undefined function symbols in executable, which are used as the function pointer, against protected function symbols in a shared object with indirect external access. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
55 lines
2.1 KiB
C
55 lines
2.1 KiB
C
/* Support for STV_PROTECTED visibility. Generic version.
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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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#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
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&& undef_map->l_type == lt_executable
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&& !(undef_map->l_1_needed
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& GNU_PROPERTY_1_NEEDED_INDIRECT_EXTERN_ACCESS)
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&& (map->l_1_needed
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& GNU_PROPERTY_1_NEEDED_INDIRECT_EXTERN_ACCESS))
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{
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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_signal_error (0, map->l_name, undef_name,
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N_("copy relocation against non-copyable protected symbol"));
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else if (ref->st_value != 0
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&& ref->st_shndx == SHN_UNDEF
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&& (type_class & ELF_RTYPE_CLASS_PLT))
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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_signal_error (0, map->l_name, undef_name,
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N_("non-canonical reference to canonical protected function"));
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}
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}
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#endif /* _DL_PROTECTED_H */
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