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enigmail  1.4.3
inject.c
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00001 /* ***** BEGIN LICENSE BLOCK *****
00002  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00003  *
00004  * The contents of this file are subject to the Mozilla Public License Version
00005  * 1.1 (the "License"); you may not use this file except in compliance with
00006  * the License. You may obtain a copy of the License at
00007  * http://www.mozilla.org/MPL/
00008  *
00009  * Software distributed under the License is distributed on an "AS IS" basis,
00010  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00011  * for the specific language governing rights and limitations under the
00012  * License.
00013  *
00014  * The Original Code is elfhack.
00015  *
00016  * The Initial Developer of the Original Code is
00017  * Mozilla Foundation.
00018  * Portions created by the Initial Developer are Copyright (C) 2010
00019  * the Initial Developer. All Rights Reserved.
00020  *
00021  * Contributor(s):
00022  *   Mike Hommey <mh@glandium.org>
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either the GNU General Public License Version 2 or later (the "GPL"), or
00026  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
00028  * of those above. If you wish to allow use of your version of this file only
00029  * under the terms of either the GPL or the LGPL, and not to allow others to
00030  * use your version of this file under the terms of the MPL, indicate your
00031  * decision by deleting the provisions above and replace them with the notice
00032  * and other provisions required by the GPL or the LGPL. If you do not delete
00033  * the provisions above, a recipient may use your version of this file under
00034  * the terms of any one of the MPL, the GPL or the LGPL.
00035  *
00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 #include <stdint.h>
00039 #include <elf.h>
00040 
00041 /* The Android NDK headers define those */
00042 #undef Elf_Ehdr
00043 #undef Elf_Addr
00044 
00045 #if BITS == 32
00046 #define Elf_Ehdr Elf32_Ehdr
00047 #define Elf_Addr Elf32_Addr
00048 #else
00049 #define Elf_Ehdr Elf64_Ehdr
00050 #define Elf_Addr Elf64_Addr
00051 #endif
00052 
00053 extern __attribute__((visibility("hidden"))) void original_init(int argc, char **argv, char **env);
00054 
00055 extern __attribute__((visibility("hidden"))) Elf32_Rel relhack[];
00056 extern __attribute__((visibility("hidden"))) Elf_Ehdr elf_header;
00057 
00058 void init(int argc, char **argv, char **env)
00059 {
00060     Elf32_Rel *rel;
00061     Elf_Addr *ptr, *start;
00062     for (rel = relhack; rel->r_offset; rel++) {
00063         start = (Elf_Addr *)((intptr_t)&elf_header + rel->r_offset);
00064         for (ptr = start; ptr < &start[rel->r_info]; ptr++)
00065             *ptr += (intptr_t)&elf_header;
00066     }
00067 
00068 #ifndef NOINIT
00069     original_init(argc, argv, env);
00070 #endif
00071 }