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Author Topic: CX Memory  (Read 5191 times)

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Offline ruler501

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Re: CX Memory
« Reply #15 on: June 02, 2011, 03:24:52 pm »
what if we were able to use the Nspire to its full potential...
*ruler likes this dream
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Offline z80man

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Re: CX Memory
« Reply #16 on: June 02, 2011, 03:25:11 pm »
I have heard though that the stack can be overflowed in Lua. That's were the possibility of an ndless exploit is right now.
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Ashbad

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Re: CX Memory
« Reply #17 on: June 02, 2011, 03:27:48 pm »
That's very true.  In Lua to overflow the stack all you need to do is something highly recursive:

Code: [Select]
function foo()
  foo()
end
I don't remember the procedure from there, but from there you have only a slight-limit of writing space where you can write to memory unchecked for a bit.  Using the stack overflow procedure to run/load Ndless programs would be a bit slow, though.
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Offline ruler501

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Re: CX Memory
« Reply #18 on: June 02, 2011, 03:29:02 pm »
Maybe they could make it so that when ndless loads you can just run the programs without needing that overflow anymore. You'd just need it to load ndless
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Version: 3.1
GCM/CS/M/S d- s++: a---- C++ UL++ P+ L++ E---- W++ N o? K- w-- o? !M V?
PS+ PE+ Y+ PGP++ t 5? X R tv-- b+++ DI+ D+ G++ e- h! !r y

Ashbad

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Re: CX Memory
« Reply #19 on: June 02, 2011, 03:37:03 pm »
Well, I think a good idea (in theory) would be this approach:

1. Keep the compiled binary data for the C/ASM program in an undisturbed format in a fake Lua file.
2. Change around an area of RAM so that the instructions in it allow for executing of assembly code.
3. Exit the Lua version of Ndless and if placed in the right location, the OS will trigger the binary calling routine you embedded and will run the C program.
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