mirror of
https://github.com/RGBCube/serenity
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e575339564
Employ the same hardening that glibc and the Linux kernel use for generating stack guards: zero the first byte of the guard such that if C-style string functions read out of bounds on the stack, we do not overwrite or potentially leak the stack guard.
32 lines
909 B
C++
32 lines
909 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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// Initialized in `initialize_libc` (we leave a placeholder value here before initialization).
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__attribute__((used)) 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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