Fix stack overflow in dlt-covert

[ShangzhiXu]

Hi team,

Regarding #793
I designed a new buffer to avoid the usage of origin argc and argv

More details in the second commit
Fix stack overflow in dlt-covert

it works on my machine to prevent the overflow

Before fix:

root@server:/home/shangzhi/fuz/fix/dlt-daemon/build-asan# ./poc.sh
[*] Flooding directory with 5000 files...
AddressSanitizer:DEADLYSIGNAL
=================================================================
==519997==ERROR: AddressSanitizer: stack-overflow on address 0x7ffda4b00000 (pc 0x556e521f9720 bp 0x7ffda4afeae0 sp 0x7ffda4afb820 T0)
    #0 0x556e521f9720 in main /home/shangzhi/fuz/fix/dlt-daemon/src/console/dlt-convert.c:409
    #1 0x7fe9c8e29d8f in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
    #2 0x7fe9c8e29e3f in __libc_start_main_impl ../csu/libc-start.c:392
    #3 0x556e521f7704 in _start (/home/shangzhi/fuz/fix/dlt-daemon/build-asan/src/console/dlt-convert+0x3704)

SUMMARY: AddressSanitizer: stack-overflow /home/shangzhi/fuz/fix/dlt-daemon/src/console/dlt-convert.c:409 in main
==519997==ABORTING

After fix

root@server:/home/shangzhi/fuz/fix/dlt-daemon/build-asan# ./poc.sh
[*] Flooding directory with 5000 files...

[minminlittleshrimp]

@ShangzhiXu
Hello,
Your approach seems fine and make sense to me. I shall take time reproducing your finding (threat) and if things fine then we can merge this patch.

These kinds of finding are very nice in term of secure coding, we now not just make things run, but make it run safely!