Smash Stack
Smash Stack is the name for an exploit that allows the use of Super Smash Bros. Brawl's Stage Builder to modify otherwise-protected system memory, allowing the usage of hacks without specialized hardware. In the hacking community of Brawl, the Smash Stack's primary use is to run mods or file replacement hacks for the game, such as Project M; the exploit, however, has considerable usage beyond Brawl hacking, and it can be used to permanently install mods to the Wii or modify the firmware of the Wii itself.
The Smash Stack notably works with all versions of Brawl, as well as on all Wii firmwares.
Operation
The Smash Stack works by exploiting an oversight in Brawl's programming. The file used for the exploit is disguised as a custom stage file, which is then read by Brawl when the Stage Builder is opened. By default, a certain amount of memory is reserved to load the file; Brawl's coding, however, does not actually check to ensure the file is smaller than this amount of memory, and as a result, the exploit file, designed to be larger than this block of memory, causes a stack smash when it is actually read. The console is then forced to restart as a result of this stack smash, but as it does so, it will read boot files from the SD card instead of the console itself. These boot files, in turn, then run modified code that can be used to run a variety of different applications after the reboot.
Due to the way the exploit works, the exploit file must be the only custom stage on both the SD card and on the Wii itself, including the sample stages and any stages from the Smash Service, or the game will likely freeze as it tries to load the stages. Once the game is quit or the console is turned off, all traces of the hack disappear.
Unlike most other Wii hacks involving stack smashes, which tend to involve editing save file data to accomplish a similar effect, the Smash Stack is entirely self-contained within Brawl as it is running. As a result, it is not possible for Nintendo to inform Wiis what such a file looks like and delete it if detected, due to the process occurring outside the console's control. This renders the hack particularly resilient compared to the previous Twilight Hack (involving The Legend of Zelda: Twilight Princess), a former major avenue of hacking Wiis via in-game exploits before it was eventually defeated via a system update. The Smash Stack can even be run on a Wii U running in Wii mode, though this currently does not allow hacking of the Wii U itself.
As a result of its unpatchability, simplicity, and presence in a popular game, the Smash Stack is one of the most common ways of hacking or modding a Wii, and the method is supported by all major Brawl mods for players who do not wish to make any permanent changes to their console. It can even be argued that the exploit is one of the biggest reasons that the hacking and modding community, for both Brawl and other Wii games such as Mario Kart Wii, reached a level of popularity and sophistication that was previously unheard of for consoles.
Video
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Trivia
- If an SD card containing the Smash Stack is inserted upon entering the stage selection screen, the game will freeze as it attempts and fails to load the Smash Stack file as if it were a custom stage. As to prevent this, a hack that disables the loading of custom stages must be in place.
