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): How reproducible: always Steps to Reproduce: 1.Boot the installer kernel with the "noshell" parameter. (PXE) 2.During installation press <CTRL><ALT><F2> 3.whoami Actual results: I get a root shell Expected results: No shell access as root during anaconda install Additional info: 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. Regards Daniel
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: https://git.fedorahosted.org/cgit/anaconda.git/commit/?id=ad34bcd
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: https://git.fedorahosted.org/cgit/anaconda.git/commit/?id=11af277