1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 31 /* 32 __stack_chk_fail routine is runtime part of stack protector compiler 33 feature. It's implemented in libc and represents die routine when stack 34 corruption is detected. 35 36 Calls are generated by compiler and injected into user functions when 37 -fstack-protector* options are used. 38 39 __stack_chk_fail_local is wrapper for __stack_chk_fail. Compiler generates 40 wrapper calls instead for PIC code only and only on IA32 for optimization 41 purpose (see gcc/config/i386/i386.c). Wrapper body is always included into 42 executable or library. This is the idea of optimization. 43 44 Glibc is doing this via libc_nonshared.a which is linked automatically 45 everytime with libc.so. In bionic we have to bring it within crtfiles 46 because libc.so is real library and not a link script like libc.so at glibc. 47 48 For x86_64 or non-PIC code compiler always generates __stack_chk_fail calls. 49 */ 50 51 #ifdef __i386__ 52 extern void __stack_chk_fail(); 53 54 __LIBC_HIDDEN__ void __stack_chk_fail_local() { 55 __stack_chk_fail(); 56 } 57 #endif 58
