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- /* pie_redirect_table.c -- module load/unload hooks for libwolfssl.ko
- *
- * Copyright (C) 2006-2023 wolfSSL Inc.
- *
- * This file is part of wolfSSL.
- *
- * wolfSSL is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * wolfSSL 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
- */
- #ifndef __PIE__
- #error pie_redirect_table.c must be compiled -fPIE.
- #endif
- #ifdef HAVE_CONFIG_H
- #include <config.h>
- #endif
- #include <wolfssl/wolfcrypt/settings.h>
- #include <wolfssl/wolfcrypt/error-crypt.h>
- #include <wolfssl/ssl.h>
- /* compiling -fPIE results in references to the GOT or equivalent thereof, which remain after linking
- * even if all other symbols are resolved by the link. naturally there is no
- * GOT in the kernel, and the wolfssl Kbuild script explicitly checks that no
- * GOT relocations occur in the PIE objects, but we still need to include a
- * dummy value here, scoped to the module, to eliminate the otherwise unresolved
- * symbol.
- */
- #if defined(CONFIG_X86)
- extern void * const _GLOBAL_OFFSET_TABLE_;
- void * const _GLOBAL_OFFSET_TABLE_ = 0;
- #elif defined(CONFIG_MIPS)
- extern void * const _gp_disp;
- void * const _gp_disp = 0;
- #endif
- struct wolfssl_linuxkm_pie_redirect_table wolfssl_linuxkm_pie_redirect_table;
- const struct wolfssl_linuxkm_pie_redirect_table
- *wolfssl_linuxkm_get_pie_redirect_table(void) {
- return &wolfssl_linuxkm_pie_redirect_table;
- }
- /* placeholder implementations for missing functions. */
- #if defined(CONFIG_MIPS)
- #undef memcpy
- void *memcpy(void *dest, const void *src, size_t n) {
- char *dest_i = (char *)dest;
- char *dest_end = dest_i + n;
- char *src_i = (char *)src;
- while (dest_i < dest_end)
- *dest_i++ = *src_i++;
- return dest;
- }
- #undef memset
- void *memset(void *dest, int c, size_t n) {
- char *dest_i = (char *)dest;
- char *dest_end = dest_i + n;
- while (dest_i < dest_end)
- *dest_i++ = c;
- return dest;
- }
- #endif
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