SvarCOM does not reset EDR's boot-time environment pointer

[mateuszviste]

SvarCOM is retrieving from the EDR kernel the segment where the "config" (kernel/boot-time) environment lies. This is supposed to work only the first time, because after obtaining it the shell should zero it out. SvarCOM relies on this to figure out when it is being booted.

The zeroing does not work, though. As an effect, when system() is called from within another program, SvarCOM thinks it is boot time and executes AUTOEXEC each time.

This is the code that was supposed to fetch & reset the EDR env segment:

But changing it to this works:

Clearly, mov [es:bx], word ptr 0 does not mean what I thought it meant...

[mateuszviste]

this one also works

[mateuszviste]

implemented the fix using the second option (mov word ptr [es:bx], 0).