Red Hat Bugzilla – Bug 807703
noshell parameter ignored by anaconda
Last modified: 2014-02-25 15:15:49 EST
Description of problem:
Adding the "noshell" parameter to the kernel arguments does not have any effect.
It is not handeled by Anaconda. Hence a root shell can be opend on tty2 during the installation process.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.Boot the installer kernel with the "noshell" parameter. (PXE)
2.During installation press <CTRL><ALT><F2>
I get a root shell
No shell access as root during anaconda install
In the Kickstart %pre section I did:
/bin/systemctl disable anaconda-shell\@.service
/bin/systemctl stop anaconda-shell\@tty2.service
This takes effect too late. 10s+ time to tamper with the system.
Trying to keep people out of a machine they have physical access to is a sucker's bet, but anyway..
Adding 'ConditionKernelCommandLine=!noshell' to anaconda-shell@.service yields the expected behavior in my testing.
We can easily get this in for F18. F17 I'm not so sure there's time for.
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This seems like a very simple fix that got needlessly EOLed. Will, can you throw it in there? That ConditionKernelCommandLine should work fine. Note that 'noshell' is documented at Anaconda/Options and there's an embarrassing note there that it's been broken since F16, so we should probably fix it...
This was fixed in commit ad34bcd, which should be in anaconda-21.16 or higher:
Okay, it was actually *partially* fixed in ad34bcd, but tmux still gave you a shell.
Commit 11af277 disables tmux when booting with 'noshell', which should complete the fix: