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From: Joe Lawrence <joe.lawrence@redhat.com>
To: Miroslav Benes <mbenes@suse.cz>
Cc: live-patching@vger.kernel.org, linux-kselftest@vger.kernel.org,
	shuah@kernel.org
Subject: Re: [PATCH] selftests/livepatch: filter 'taints' from dmesg comparison
Date: Thu, 7 Nov 2019 10:13:42 -0500
Message-ID: <c84834ae-2382-f1e7-6924-268e05df1bf3@redhat.com> (raw)
In-Reply-To: <alpine.LSU.2.21.1911071549340.21726@pobox.suse.cz>

On 11/7/19 9:53 AM, Miroslav Benes wrote:
> On Thu, 7 Nov 2019, Joe Lawrence wrote:
> 
>> On 11/7/19 3:42 AM, Miroslav Benes wrote:
>>> On Wed, 6 Nov 2019, Joe Lawrence wrote:
>>>
>>>> The livepatch selftests compare expected dmesg output to verify kernel
>>>> behavior.  They currently filter out "tainting kernel with
>>>> TAINT_LIVEPATCH" messages which may be logged when loading livepatch
>>>> modules.
>>>>
>>>> Further filter the log to also drop "loading out-of-tree module taints
>>>> kernel" messages in case the klp_test modules have been build without
>>>> the in-tree module flag.
>>>
>>> That is true, but "tainting kernel with TAINT_LIVEPATCH" should be printed
>>> out even in this case. check_modinfo_livepatch() is called for all modules
>>> and relies on MODINFO(livepatch, Y).
>>>   > So either the bug is elsewhere or I need one more cup of tea.
> 
> Ok, the above is not relevant here.
> 
> I'm only wondering about the execution steps, because supporting modules
> lib/livepatch/ should be built as in-tree. No?
>   

Ah, I see.  Well as you noted they are modprobed, so theoretically they 
could come from anywhere OOT, right?

In my test, I had a kernel tree, but only wanted to build the test 
modules.  Once I did a 'make modules SUBDIR=' or 'make M= ...' 
KBUILD_EXTMOD got flipped on and the modules lost in-tree status.  No 
amount of googling could tell me how to build a single in-tree directory 
of modules :(  And then it seemed that opening the tests for OOT modules 
was reasonable anyway.

-- Joe


  reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-06 22:28 Joe Lawrence
2019-11-07  8:42 ` Miroslav Benes
2019-11-07 14:40   ` Joe Lawrence
2019-11-07 14:53     ` Miroslav Benes
2019-11-07 15:13       ` Joe Lawrence [this message]
2019-11-07 15:24         ` Miroslav Benes
2019-11-07 15:33           ` Joe Lawrence
2019-11-07 12:22 ` Kamalesh Babulal
2019-11-07 15:29 ` Petr Mladek

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