linux-kernel - RE: As of kernel 4.4-rc1 segmentation fault if msr module not loaded. [REGRESSION][BISECTED]

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Message-ID: <000401d1292e$7c50ce80$74f26b80$@net>
Date:	Fri, 27 Nov 2015 08:12:59 -0800
From:	"Doug Smythies" <dsmythies@...us.net>
To:	"'Borislav Petkov'" <bp@...en8.de>
Cc:	<linux-kernel@...r.kernel.org>,
	"Doug Smythies" <dsmythies@...us.net>
Subject: RE: As of kernel 4.4-rc1 segmentation fault if msr module not loaded. [REGRESSION][BISECTED]

On 2015.11.26 10:10 Borislav Petkov wrote:
> On Thu, Nov 26, 2015 at 08:25:43AM -0800, Doug Smythies wrote:
>>
>> In some distros, the msr module is not loaded by default.
>> (I guess not built in by default, would be more correct.)
>> I often forget to load it before using "rdmsr" or "wrmsr".
>> It was never an issue before, but as of Kernel 4.4-rc1
>> it causes a segmentation fault crash. Example:
>> 
>> # rdmsr -a 0x19a
>> Segmentation fault (core dumped)

> You can either cherrypick
> http://git.kernel.org/tip/2d5be37d686c4dae8e60d20283d6f44ac2c44f65

Just for completeness:
I confirm that the above commit fixes the issue raised herein.
Thanks.

... Doug


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