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https://github.com/RGBCube/serenity
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982799f7a0
This works by defining a set of weak symbols in dynamic linker whose value would be provided by it. This has the same effect as preloading library that magically knows right addresses of functions shared between dynamic linker and LibC. We were previously passing the same information by rewriting values based on hardcoded library name, so the new approach seems a little nicer to me.
32 lines
859 B
C++
32 lines
859 B
C++
/*
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* Copyright (c) 2021, Brian Gianforcaro <bgianf@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Format.h>
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#include <AK/Types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/internals.h>
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#include <unistd.h>
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#if defined __SSP__ || defined __SSP_ALL__
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# error "file must not be compiled with stack protection enabled on it. Use -fno-stack-protector"
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#endif
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extern "C" {
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extern uintptr_t __stack_chk_guard;
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// Populated by DynamicLinker in shared executables.
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[[gnu::weak]] uintptr_t __stack_chk_guard = (uintptr_t)0xc6c7c8c9;
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__attribute__((noreturn)) void __stack_chk_fail()
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{
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dbgln("Error: USERSPACE({}) Stack protector failure, stack smashing detected!", getpid());
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if (__stdio_is_initialized)
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warnln("Error: Stack protector failure, stack smashing detected!");
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abort();
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}
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} // extern "C"
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