Changes

==Stale / Rejected Efforts==

==Stale / Rejected Efforts==

* Neimod has been working on a RAM dumping setup for a little while now. He's de-soldered the 3DS's RAM chip and hooked it and the RAM pinouts on the 3DS's PCB up to a custom RAM dumping setup. Recent photos show that the setup is working quite well, with the 3DS successfully booting up. Pictures of neimod's work can be found on [http://www.flickr.com/photos/neimod/ his Flickr stream].

* Neimod has been working on a RAM dumping setup for a little while now. He's de-soldered the 3DS's RAM chip and hooked it and the RAM pinouts on the 3DS' PCB up to a custom RAM dumping setup. Recent photos show that the setup is working quite well, with the 3DS successfully booting up. Pictures of neimod's work can be found on [http://www.flickr.com/photos/neimod/ his Flickr stream].

       Neimod's flickr stream is now private and his work is considered awesome.

       Neimod's flickr stream is now private and his work is considered awesome.

* Pushmo (3DSWare), QR codes: level name is properly limited to 16 characters, game doesn't crash with a longer name. The only possible crashes are triggered by out-of-bounds values, these crashes are caused by the application attempting to load a ptr from a buffer located at NULL.

* Pushmo (3DSWare), QR codes: level name is properly limited to 16 characters, game doesn't crash with a longer name. The only possible crashes are triggered by out-of-bounds values, these crashes are caused by the application attempting to load a ptr from a buffer located at NULL.

* Pyramids (3DSWare), QR codes: no strings. Only crashes are from out-of-bounds values (like background ID) and are not exploitable.

* Pyramids (3DSWare), QR codes: no strings. Only crashes are from out-of-bounds values (like background ID) and are not exploitable.

* 3DS browser, 2^32 characters long string: this is similar to the vuln fixed [http://git.chromium.org/gitweb/?p=external/Webkit.git;a=commitdiff;h=ec471f16fbd1f879cb631f9b022fd16acd75f4d4 here], concat-large-strings-crash2.html triggers a crash which is about the same as the one triggered by a 2^32 string. Most of the time this vuln will cause a memory page permissions fault, since the webkit code attempts to copy the string text data to the output buffer located in read-only [[CRO0|CRO]] heap memory. The only difference between a crash triggered by a 2^32 string and the concat-large-strings-crash2.html crash is that the former copies the string data using the original string length(like 1 text character for "x", 4 for "xxxx") while the latter attempts to copy >12MB. In some ''very'' rare cases a thread separate from the string data-copy thread will crash, this might be exploitable however this is useless since it rarely crashes this way.

 

 

* 3DS browser, 2^32 characters long string: this is similar to the vulnerability fixed [http://git.chromium.org/gitweb/?p=external/Webkit.git;a=commitdiff;h=ec471f16fbd1f879cb631f9b022fd16acd75f4d4 here], concat-large-strings-crash2.html triggers a crash which is about the same as the one triggered by a 2^32 string. Most of the time this vulnerability will cause a memory page permissions fault, since the WebKit code attempts to copy the string text data to the output buffer located in read-only [[CRO0|CRO]] heap memory. The only difference between a crash triggered by a 2^32 string and the concat-large-strings-crash2.html crash is at the former copies the string data using the original string length(like 1 text character for "x", 4 for "xxxx") while the latter attempts to copy >12MB. In some ''very'' rare cases a thread separate from the string data-copy thread will crash, this might be exploitable. However, this is mostly useless since it rarely crashes this way.

==Tips and info==

==Tips and info==

The 3DS uses the XN feature of the ARM processor, and only apps that have the necessary permissions in their headers can set memory to be executable. This means that although a usable buffer overflow exploit would still be useful, it would not go the entire way towards allowing code to be run in an easy/practical fashion (ie an actual homebrew launcher) - for that, an exploit in the system is required. A buffer overflow exploit does, however, provide enough wriggle room through the use of return-oriented programming to potentially trigger a system exploit.

The 3DS uses the XN feature of the ARM processor, and only apps that have the necessary permissions in their headers can set memory to be executable. This means that although a usable buffer overflow exploit would still be useful, it would not go the entire way towards allowing code to be run in an easy or practical fashion (like an actual homebrew launcher). For that, an exploit in the system is required. A buffer overflow exploit does, however, provide enough wiggle room through the use of return-oriented programming to potentially trigger a system exploit.

SD card [[extdata]] and SD savegames can be attacked, for consoles where the console-unique [[Nand/private/movable.sed|movable.sed]] was dumped.

SD card [[extdata]] and SD savegames can be attacked, for consoles where the console-unique [[Nand/private/movable.sed|movable.sed]] was dumped.