linux-kernel - Re: [PATCH 9/11] Panic delay fix

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <45CAE87E.8070502@vmware.com>
Date:	Thu, 08 Feb 2007 01:08:14 -0800
From:	Zachary Amsden <zach@...are.com>
To:	Andi Kleen <ak@....de>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Chris Wright <chrisw@...s-sol.org>
Subject: Re: [PATCH 9/11] Panic delay fix

Andi Kleen wrote:
> On Wed, Feb 07, 2007 at 02:31:57PM -0800, Zachary Amsden wrote:
>   
>> Dmitry Torokhov wrote:
>>     
>>> I am confused - does i8042 talk to a virtual or real hardware here? In
>>> any case I think you need to fix kernel/panic.c to have proper
>>> (m)delay, not mess with i8042.
>>>       
>> I think I need to fix both of them actually.  This is virtual hardware, 
>> but when you grab focus on a VM, the virtual hardware gets reflected to 
>> the actual physical keyboard.  Driving physical hardware that fast is bad.
>>     
>
> ???
>
> Surely the physical keyboard is always handled by the host kernel? 
> I hope you're not saying it's trying to access the io ports directly?
>   

No, not that.  But the virtual keyboard I/O gets processed and converted 
to physical keyboard I/O when a keyboard is attached to a VM.  The 
result is that the virtual keyboard spinning out of control causes the 
physical keyboard to receive the same commands, far too rapidly.

So the keyboard blinks out of control and acts as if possessed by demons.

Zach
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/