linux-kernel - Re: Undefined Instruction

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Message-ID: <20111103191555.GC7197@vps.mortis.eu>
Date:	Thu, 3 Nov 2011 20:15:55 +0100
From:	Giel van Schijndel <me@...tis.eu>
To:	Xin Tong <xerox.time.tech@...il.com>
Cc:	Jiri Kosina <jkosina@...e.cz>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Undefined Instruction

On Wed, Nov 02, 2011 at 05:14:17PM -0400, Xin Tong wrote:
> On Wed, Nov 2, 2011 at 5:10 PM, Jiri Kosina <jkosina@...e.cz> wrote:
>> On Wed, 2 Nov 2011, Xin Tong wrote:
>>
>>> If i change the kernel, i could have the application stary alive
>>> right?
>>
>> No need for any kernel changes. You can set your own signal handler
>> for SIGILL (but iirc that will make any further behavior of your
>> application undefined as long as POSIX is involved).
> 
> There must be a default handler install for every application on
> linux, right  ? Is there any signal that the operating system simply
> kills the programs without sending a signal to the user level ?

It's known by the rather straightforward name of SIGKILL. I.e. userland
cannot install a signal handler for that signal, the process just gets
killed.

-- 
Met vriendelijke groet,
With kind regards,
Giel van Schijndel
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