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