linux-kernel - Re: [RFC 04/16] kgr: add testing kgraft patch

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Date:	Mon, 12 May 2014 14:50:08 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Pavel Machek <pavel@....cz>
CC:	linux-kernel@...r.kernel.org, jirislaby@...il.com,
	Vojtech Pavlik <vojtech@...e.cz>, Michael Matz <matz@...e.de>,
	Jiri Kosina <jkosina@...e.cz>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [RFC 04/16] kgr: add testing kgraft patch

On 05/06/2014 01:03 PM, Pavel Machek wrote:
> Hi!

Hi!

>> This is intended to be a presentation of the kgraft engine, so it is
>> placed into samples/ directory.
>>
>> It patches sys_iopl() and sys_capable() to print an additional message
>> to the original functionality.
>>
>> Jiri Kosina <jkosina@...e.cz>
> 
> ??

This was a messed up s-o-b line. Fixed already.

>> +KGR_PATCHED_FUNCTION(patch, SyS_iopl, kgr_new_sys_iopl);
>> +
>> +static bool new_capable(int cap)
>> +{
>> +	printk(KERN_DEBUG "kgr-patcher: this is a new capable()\n");
>> +
>> +        return ns_capable(&init_user_ns, cap);
>> +}
>> +KGR_PATCHED_FUNCTION(patch, capable, new_capable);
> 
> So for some reason when replacing sys_iopl, capable needs to be replaced, too?

Oh, no. This patch just demonstrates how to patch two functions at once.
They were chosen arbitrarily.

The rest has been fixed now.

thanks,
-- 
js
suse labs
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