I found a vulnerability in an online compiler.

So, I heard that people have been exploiting online compilers, and decided to try and do it (but for white-hat reasons) so I used the system() function, which made it a lot harder so i decided to execute bash with execl(). I tried doing that but I kept getting denied. That is until I realized that I could try using malloc(256) and fork() in an infinite loop while running multiple tabs of it. It worked. The compiler kept on crashing. After a while I decided that I should probably report the vulnerabilites.

There was no one to report them to. I looked through the whole website but couldn't find any info about the people who made it. I searched on github. No results. Well fuck.

Hell of a Docker

One application in c++. 4 in c# targeting Linux. Several logging places, Several configuration files , dozens of different folders to access (read/write). Many applications being called from just one that orchestrates everything.

OS is Linux. Installation is to be made inside a docker image and later placed in a container by means of several bash files and python scripts. All these are part of a legacy set of applications.

They’ve asked me to just comment out one line which took 3 days to find out because they didn’t remember where it was and in which application it was and what was in that line.

After changing it, I was asked to create a test environment which must have resemblance to the current server in production. 12 days later And many errors, headaches, problems with docker, I got it done.

Test starts and then, problems with docker volumes, network, images, docker-composer, config files and applications, started to appear.

1 month later, I still have problems and can’t run all applications at least once completely using the whole set.

Just one simple task of deploying locally some applications, which would take one or two days, is becoming a nightmare.

Conclusion: While still trying to figure out why an infinite loop was caused by some DB connection attempt in an application, I am collecting a great amount of hate for docker. It might be good for something, that’s for sure, but in my experience so far, it is far worse than any expectations I had before using it.

Lesson learned: Must run away from tasks involving that shit!

Annoying monday - nearly no code but useless things like trying to use a Windows keyboard on some old MacOS X
On the other hand: for the first time I wrote a one line for loop in bash that worked - without googling!