[NSWI004] How to cause segmentation fault.

[Petr Tuma]

Hi,

I guess your point is how to do an equivalent of an `assert` statement (that is, announce a fatal error and stop the execution) ? For that, there already is an `assert` macro in `debug.h` ... or did you have something else in mind ?

Petr


On 30/10/2020 18:55, Jura Pelc wrote:
> Hello,
> 
> I am working on the implementation of free and I come across a conflict between me as a C# programer and kernel C code.
> ```c
> if((uintptr_t)ptr < heap_begin || (uintptr_t)ptr > heap_end)
> {
>      //TODO: segmentation fault
>      return;
> }
> ```
> I want to safely determine that the user is dum and trying to free some unknown memory.
> For this, I can see some kind of range check for free and "throwing" segmentation fault as interop.
> I was thinking about https://www.tutorialspoint.com/c_standard_library/c_function_raise.htm <https://www.tutorialspoint.com/c_standard_library/c_function_raise.htm>, but I did not found this is the kernel.
> 
> So my question is, how to raise segmentation fault during free safely?
> 
> -- 
> 
> S pozdravem Jiří Pelc
> Matematicko-fyzikální fakulta
> Univerzita Karlova
> 
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