Question

5

Who created files in "/proc" with my username?

rated 0 times [ 5] [ 0] / answers: 1 / hits: 700 / 2 Years ago, wed, august 24, 2022, 8:41:00

I just learned about file security, user & group, etc.
And I appreciate a lot about the elegance of the filesystem of linux.

My username is lyg, and I found there are some files with owner lyg in /proc/, as shown below:

lyg@lyg-VirtualBox:~$ ll /proc/|grep lyg

dr-xr-xr-x   8 root       lyg                 0 Aug  7 09:11 1119/

dr-xr-xr-x   8 lyg        lyg                 0 Aug  7 09:47 1298/

dr-xr-xr-x   8 lyg        lyg                 0 Aug  7 22:05 7097/

dr-xr-xr-x   8 lyg        lyg                 0 Aug  7 22:05 7098/

Then I found that this could not happen normally, these files cannot be created by me manually, since I had no permissions requiered, see:

lyg@lyg-VirtualBox:~$ ls -ld /proc/

dr-xr-xr-x 108 root root 0 Aug  7 09:10 /proc/

and here was my processes information, from which I knew that /proc/1298/ was related to -bash process:

lyg@lyg-VirtualBox:~$ ps -ef|grep lyg

avahi      452     1  0 09:11 ?        00:00:00 avahi-daemon: running [lyg-VirtualBox.local]

lyg       1298  1119  0 09:11 tty1     00:00:22 -bash

lyg       7099  1298  0 22:05 tty1     00:00:00 ps -ef

lyg       7100  1298  0 22:05 tty1     00:00:00 grep --color=auto lyg

So, how are these files in /proc/ created?

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clegian

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answered 2 Years ago ardtry · Accepted Answer

Those files are related to the processes created by the OS on behalf of you. Those files store real-time information about the processes, such as memory-block used by the processes, opened files by the processes, names of files which are accessed by your processes.

Those files are created by the OS, that is Ubuntu for you. As Ubuntu, i.e the OS has full permission on the file system, so, it can create any file anywhere

Let's do an experiment:

For experiment, run these line of codes in your terminal

First see the number of files in /proc on behalf of you
```
 ll /proc/ | grep lyg | wc -l
```

Then create another process. Let the new process be another bash instance. So type bash and hit Enter.

Again execute this command
```
ll /proc/ | grep lyg | wc -l
```
you can now see that, there is at least 1 more file. This file is created for the new process

Then now exit the newly created bash, with exit command.

Now again type this command:
```
ll /proc/ | grep lyg | wc -l
```

You will see that, the output now is 1 less than the previous. Because, The OS deleted the file corresponding the just existed or terminated bash process.