diff options
Diffstat (limited to 'sysdeps/i386/dl-cet.c')
| -rw-r--r-- | sysdeps/i386/dl-cet.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/sysdeps/i386/dl-cet.c b/sysdeps/i386/dl-cet.c new file mode 100644 index 0000000000..5d9a4e8d51 --- /dev/null +++ b/sysdeps/i386/dl-cet.c @@ -0,0 +1,67 @@ +/* Linux/i386 CET initializers function. + Copyright (C) 2018 Free Software Foundation, Inc. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + + +#define LINKAGE static inline +#define _dl_cet_check cet_check +#include <sysdeps/x86/dl-cet.c> +#undef _dl_cet_check + +#ifdef SHARED +void +_dl_cet_check (struct link_map *main_map, const char *program) +{ + cet_check (main_map, program); + + if ((GL(dl_x86_feature_1)[0] & GNU_PROPERTY_X86_FEATURE_1_SHSTK)) + { + /* Replace _dl_runtime_resolve and _dl_runtime_profile with + _dl_runtime_resolve_shstk and _dl_runtime_profile_shstk, + respectively if SHSTK is enabled. */ + extern void _dl_runtime_resolve (Elf32_Word) attribute_hidden; + extern void _dl_runtime_resolve_shstk (Elf32_Word) attribute_hidden; + extern void _dl_runtime_profile (Elf32_Word) attribute_hidden; + extern void _dl_runtime_profile_shstk (Elf32_Word) attribute_hidden; + unsigned int i; + struct link_map *l; + Elf32_Addr *got; + + if (main_map->l_info[DT_JMPREL]) + { + got = (Elf32_Addr *) D_PTR (main_map, l_info[DT_PLTGOT]); + if (got[2] == (Elf32_Addr) &_dl_runtime_resolve) + got[2] = (Elf32_Addr) &_dl_runtime_resolve_shstk; + else if (got[2] == (Elf32_Addr) &_dl_runtime_profile) + got[2] = (Elf32_Addr) &_dl_runtime_profile_shstk; + } + + i = main_map->l_searchlist.r_nlist; + while (i-- > 0) + { + l = main_map->l_initfini[i]; + if (l->l_info[DT_JMPREL]) + { + got = (Elf32_Addr *) D_PTR (l, l_info[DT_PLTGOT]); + if (got[2] == (Elf32_Addr) &_dl_runtime_resolve) + got[2] = (Elf32_Addr) &_dl_runtime_resolve_shstk; + else if (got[2] == (Elf32_Addr) &_dl_runtime_profile) + got[2] = (Elf32_Addr) &_dl_runtime_profile_shstk; + } + } + } +} +#endif |