ladybird/Userland/Tests/LibC/stack-smash.cpp

/*
 * Copyright (c) 2021, Brian Gianforcaro <bgianf@serenityos.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <cstdio>

// Note: Needs to be 'noline' so stack canary isn't optimized out.
static void __attribute__((noinline)) smasher(char* string)
{
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Warray-bounds"
    for (int i = 0; i < 256; i++) {
        string[i] = 'A';
    }
#pragma GCC diagnostic pop
}

// Note: Needs to be 'noline' so stack canary isn't optimized out.
static void __attribute__((noinline)) stack_to_smash()
{
    char string[8] = {};
    smasher(string);
}

int main()
{
    puts("[+] Starting the stack smash...");
    stack_to_smash();
    puts("[+] Stack smash wasn't detected!");

    return 0;
}