61 lines
2.4 KiB
C
61 lines
2.4 KiB
C
/*
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* Copyright (C) 2012 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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__stack_chk_fail routine is runtime part of stack protector compiler
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feature. It's implemented in libc and represents die routine when stack
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corruption is detected.
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Calls are generated by compiler and injected into user functions when
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-fstack-protector* options are used.
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__stack_chk_fail_local is wrapper for __stack_chk_fail. Compiler generates
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wrapper calls instead for PIC code only and only on IA32 for optimization
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purpose (see gcc/config/i386/i386.c). Wrapper body is always included into
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executable or library. This is the idea of optimization.
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Glibc is doing this via libc_nonshared.a which is linked automatically
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everytime with libc.so. In bionic we have to bring it within crtfiles
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because libc.so is real library and not a link script like libc.so at glibc.
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For x86_64 or non-PIC code compiler always generates __stack_chk_fail calls.
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*/
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#ifdef __i386__
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#ifdef __PIC__
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extern void __stack_chk_fail();
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__attribute__ ((visibility ("hidden")))
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void __stack_chk_fail_local()
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{
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__stack_chk_fail();
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}
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#endif
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#endif
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