Bug 807703

Summary: noshell parameter ignored by anaconda
Product: [Fedora] Fedora Reporter: Daniel Winter <dwinter_nospam>
Component: anacondaAssignee: Will Woods <wwoods>
Status: CLOSED RAWHIDE QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: rawhideCC: awilliam, g.kaviyarasu, howey.vernon, jonathan, vanmeeuwen+fedora
Target Milestone: ---Keywords: FutureFeature, Reopened
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: anaconda-21.25-1 Doc Type: Enhancement
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2019-12-11 23:01:24 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Daniel Winter 2012-03-28 14:26:44 UTC
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

Comment 2 Will Woods 2012-05-15 19:33:19 UTC
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.

Comment 3 Fedora End Of Life 2013-01-17 00:49:06 UTC
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Comment 4 Fedora End Of Life 2013-02-14 02:29:59 UTC
Fedora 16 changed to end-of-life (EOL) status on 2013-02-12. Fedora 16 is 
no longer maintained, which means that it will not receive any further 
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of 
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Comment 5 Adam Williamson 2013-05-12 00:14:54 UTC
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...

Comment 6 Will Woods 2014-01-24 18:26:29 UTC
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

Comment 7 Will Woods 2014-02-25 20:15:49 UTC
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

Comment 8 Adam Williamson 2019-12-11 23:01:24 UTC
Confirmed the fix in a recent Rawhide compose (look, I'm only 5 years 10 months late, who's really counting)