buffer overflow

[PatNarciso]

hi there --

attempting to start ./plot with a large plot number, causes a buffer overflow -- and ./plot fails to start. example provided.

:/packages/mdcct$ ./plot -k xxxxx8675309 -x 0 -a -d /media/xxxx/burstplota/ -s $(date +%s)"0000000000" -n 400000 -m 4000 -t 4
Async mode set.
Using original algorithm.
Creating plots for nonces 15157041750000000000 to 15157041750000400000 (104 GB) using 2000 MB memory and 4 threads
*** buffer overflow detected ***: ./plot terminated
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7f112c9807e5]
/lib/x86_64-linux-gnu/libc.so.6(__fortify_fail+0x5c)[0x7f112ca2211c]
/lib/x86_64-linux-gnu/libc.so.6(+0x117120)[0x7f112ca20120]
/lib/x86_64-linux-gnu/libc.so.6(+0x116689)[0x7f112ca1f689]
/lib/x86_64-linux-gnu/libc.so.6(_IO_default_xsputn+0x80)[0x7f112c9846b0]
/lib/x86_64-linux-gnu/libc.so.6(_IO_vfprintf+0xc90)[0x7f112c956e00]
/lib/x86_64-linux-gnu/libc.so.6(__vsprintf_chk+0x84)[0x7f112ca1f714]
/lib/x86_64-linux-gnu/libc.so.6(__sprintf_chk+0x7d)[0x7f112ca1f66d]
./plot[0x400fb3]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f112c929830]
./plot[0x401719]
======= Memory map: ========
00400000-00408000 r-xp 00000000 fc:00 4980916 /packages/mdcct/plot
00607000-00608000 r-xp 00007000 fc:00 4980916 /packages/mdcct/plot
00608000-00609000 rwxp 00008000 fc:00 4980916 /packages/mdcct/plot
01802000-01823000 rwxp 00000000 00:00 0 [heap]
7f10af6f1000-7f10af707000 r-xp 00000000 fc:00 2621505 /lib/x86_64-linux-gnu/libgcc_s.so.1
7f10af707000-7f10af906000 ---p 00016000 fc:00 2621505 /lib/x86_64-linux-gnu/libgcc_s.so.1
7f10af906000-7f10af907000 rwxp 00015000 fc:00 2621505 /lib/x86_64-linux-gnu/libgcc_s.so.1
7f10af907000-7f112c909000 rwxp 00000000 00:00 0
7f112c909000-7f112cac9000 r-xp 00000000 fc:00 2621638 /lib/x86_64-linux-gnu/libc-2.23.so
7f112cac9000-7f112ccc9000 ---p 001c0000 fc:00 2621638 /lib/x86_64-linux-gnu/libc-2.23.so
7f112ccc9000-7f112cccd000 r-xp 001c0000 fc:00 2621638 /lib/x86_64-linux-gnu/libc-2.23.so
7f112cccd000-7f112cccf000 rwxp 001c4000 fc:00 2621638 /lib/x86_64-linux-gnu/libc-2.23.so
7f112cccf000-7f112ccd3000 rwxp 00000000 00:00 0
7f112ccd3000-7f112cceb000 r-xp 00000000 fc:00 2621616 /lib/x86_64-linux-gnu/libpthread-2.23.so
7f112cceb000-7f112ceea000 ---p 00018000 fc:00 2621616 /lib/x86_64-linux-gnu/libpthread-2.23.so
7f112ceea000-7f112ceeb000 r-xp 00017000 fc:00 2621616 /lib/x86_64-linux-gnu/libpthread-2.23.so
7f112ceeb000-7f112ceec000 rwxp 00018000 fc:00 2621616 /lib/x86_64-linux-gnu/libpthread-2.23.so
7f112ceec000-7f112cef0000 rwxp 00000000 00:00 0
7f112cef0000-7f112cf16000 r-xp 00000000 fc:00 2621607 /lib/x86_64-linux-gnu/ld-2.23.so
7f112d107000-7f112d10a000 rwxp 00000000 00:00 0
7f112d112000-7f112d115000 rwxp 00000000 00:00 0
7f112d115000-7f112d116000 r-xp 00025000 fc:00 2621607 /lib/x86_64-linux-gnu/ld-2.23.so
7f112d116000-7f112d117000 rwxp 00026000 fc:00 2621607 /lib/x86_64-linux-gnu/ld-2.23.so
7f112d117000-7f112d118000 rwxp 00000000 00:00 0
7fffe0752000-7fffe0773000 rwxp 00000000 00:00 0 [stack]
7fffe07e0000-7fffe07e3000 r--p 00000000 00:00 0 [vvar]
7fffe07e3000-7fffe07e5000 r-xp 00000000 00:00 0 [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall]
Aborted
<

thank you.

[waltercool]

Use https://github.com/alter3d/omdcct, it looks like it solved this problem.

I also got a buffer overflow, but this project seems to works nice.