4 ms·

I just fixed a bizarre problem on Fedora by disabling SE. By the way, the user is using a PC I configured with used hardware, partly from me. It's supposed to b

by onli 10y ago

I just fixed a bizarre problem on Fedora by disabling SE. By the way, the user is using a PC I configured with used hardware, partly from me. It's supposed to be a just-works system, meaning that it runs Fedora and I did no special configuration at all. That was the error description I got: "When starting the network does not work. I have to do a lot of things to make it work." Later I got more infos: "It says there are 7 errors. If I let it fix it it has to restart and then works". It turns out that these 7 errors are all SE-Linux-Errors. Something about /etc/resolv.conf not being readable. The error helper suggests to fix it for now and also some command to fix it permanently, those commands fail and do nothing. So of course I just deactivated that SE-bullshit. Really, fucking vanilla Fedora on a mainstream Gnome3 desktop. What the hell are they thinking?

testUser69 10y ago
I've used Fedora on the desktop for about five years and never had this issue. Maybe they were thinking you shouldn't change permissions on files in /etc unless you know what you're doing?
- onli 10y ago
  I did not change any permissions. Like I said, no modification from my side. Vanilla Fedora.
lima 10y ago
If you'd post the actual errors, I'm sure we could help you with that.
- onli 10y ago
  You mean the actual error message? Sorry, it's already solved now and I didn't write it down. It was in Spanish, so I also don't remember how it was worded. But its content is correctly described above: Unable to open /etc/resolv.conf. And btw, that is exactly what I don't want. I do report errors, I solve bugs. But I don't want to debug SE-errors, which just because of its paranoia makes perfectly normal usage impossible, so far that distros that enable SEL spit out errormessages immediately after installation. I don't see its purpose anyway.
  - seanp2k2 10y ago
    The main value in SELinux is to protect apps against things they should never be allowed to do (like your web app reading /etc/shadow or notepad listening for network connections) so that even if they get hit with a 0day, they're still not really vulnerable because the SEL stuff blocks all the bad things they could do. It really truly works in practice to prevent a bunch of bad stuff. In reality though, most people just disable it because it's a pain to learn and deal with.
    - onli 10y ago
      I know. But thanks for the answer. It is not what I meant, but it responds to what I wrote. A security-solution that makes normal use impossible is not a solution. Security solutions never work if they make usability worse. SELinux goes farther, it also makes functionality worse till impossible. That is what I meant when I wrote that I don't see the point of it. Something like that can be a good solution if you are manually hardening a specific process. As a general security solution it is completely unfit. I don't see the point of pushing it for that. Fedora should never have activated it.

by onli 10y ago

testUser69 10y ago

I've used Fedora on the desktop for about five years and never had this issue. Maybe they were thinking you shouldn't change permissions on files in /etc unless you know what you're doing?

onli 10y ago
I did not change any permissions. Like I said, no modification from my side. Vanilla Fedora.

lima 10y ago

If you'd post the actual errors, I'm sure we could help you with that.

onli 10y ago
You mean the actual error message? Sorry, it's already solved now and I didn't write it down. It was in Spanish, so I also don't remember how it was worded. But its content is correctly described above: Unable to open /etc/resolv.conf. And btw, that is exactly what I don't want. I do report errors, I solve bugs. But I don't want to debug SE-errors, which just because of its paranoia makes perfectly normal usage impossible, so far that distros that enable SEL spit out errormessages immediately after installation. I don't see its purpose anyway.
- seanp2k2 10y ago
  The main value in SELinux is to protect apps against things they should never be allowed to do (like your web app reading /etc/shadow or notepad listening for network connections) so that even if they get hit with a 0day, they're still not really vulnerable because the SEL stuff blocks all the bad things they could do. It really truly works in practice to prevent a bunch of bad stuff. In reality though, most people just disable it because it's a pain to learn and deal with.
  - onli 10y ago
    I know. But thanks for the answer. It is not what I meant, but it responds to what I wrote. A security-solution that makes normal use impossible is not a solution. Security solutions never work if they make usability worse. SELinux goes farther, it also makes functionality worse till impossible. That is what I meant when I wrote that I don't see the point of it. Something like that can be a good solution if you are manually hardening a specific process. As a general security solution it is completely unfit. I don't see the point of pushing it for that. Fedora should never have activated it.