| 1 | /* Support for STV_PROTECTED visibility. Generic version. |
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| 2 | Copyright (C) 2021-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #ifndef _DL_PROTECTED_H |
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| 20 | #define _DL_PROTECTED_H |
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| 21 | |
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| 22 | static inline void __attribute__ ((always_inline)) |
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| 23 | _dl_check_protected_symbol (const char *undef_name, |
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| 24 | const struct link_map *undef_map, |
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| 25 | const ElfW(Sym) *ref, |
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| 26 | const struct link_map *map, |
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| 27 | int type_class) |
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| 28 | { |
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| 29 | if (undef_map != NULL |
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| 30 | && undef_map->l_type == lt_executable |
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| 31 | && !(undef_map->l_1_needed |
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| 32 | & GNU_PROPERTY_1_NEEDED_INDIRECT_EXTERN_ACCESS) |
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| 33 | && (map->l_1_needed |
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| 34 | & GNU_PROPERTY_1_NEEDED_INDIRECT_EXTERN_ACCESS)) |
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| 35 | { |
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| 36 | if ((type_class & ELF_RTYPE_CLASS_COPY)) |
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| 37 | /* Disallow copy relocations in executable against protected |
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| 38 | data symbols in a shared object which needs indirect external |
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| 39 | access. */ |
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| 40 | _dl_signal_error (0, map->l_name, undef_name, |
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| 41 | N_("copy relocation against non-copyable protected symbol" )); |
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| 42 | else if (ref->st_value != 0 |
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| 43 | && ref->st_shndx == SHN_UNDEF |
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| 44 | && (type_class & ELF_RTYPE_CLASS_PLT)) |
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| 45 | /* Disallow non-zero symbol values of undefined symbols in |
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| 46 | executable, which are used as the function pointer, against |
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| 47 | protected function symbols in a shared object with indirect |
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| 48 | external access. */ |
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| 49 | _dl_signal_error (0, map->l_name, undef_name, |
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| 50 | N_("non-canonical reference to canonical protected function" )); |
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| 51 | } |
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| 52 | } |
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| 53 | |
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| 54 | #endif /* _DL_PROTECTED_H */ |
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| 55 | |
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