Secure attention Key: Login and GkSudo

Reinhard Tartler siretart at ubuntu.com
Sun Oct 30 18:37:38 UTC 2011


On So, Okt 30, 2011 at 15:11:04 (CET), staticd wrote:

>> Windows NT is designed so that, unless system security is already
>> compromised in some other way, only the Winlogon process, a trusted
>> system process, can receive notification of this keystroke
>> combination. This is because the kernel remembers the process ID of
>> the Winlogon process, and allows only that process to receive the
>> notification.
>>
>> So says Wikipedia.
>>
>> Interestingly, VMWare catches the sequence as well.
>>
>>
> I was thinking of a Alt+Sysrq combination capturable only by the kernel.
> (Ctrl+Alt+Sysrq ?)

The SAK for Linux systems is Alt+Sysrq+k

While this SAK can be disabled, Ubuntu ships with this functionality
enabled. It safely and uncatchably terminates your running X11 session,
returning back to your login manager.

Cheers,
Reinhard.

-- 
Gruesse/greetings,
Reinhard Tartler, KeyID 945348A4




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