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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20151126180934.GB18183@pd.tnic>
Date:	Thu, 26 Nov 2015 19:09:34 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Doug Smythies <dsmythies@...us.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: As of kernel 4.4-rc1 segmentation fault if msr module not
 loaded. [REGRESSION][BISECTED]

On Thu, Nov 26, 2015 at 08:25:43AM -0800, Doug Smythies wrote:
> Hi,
> 
> This might be considered a minor issue, but I submit my
> findings anyhow.
> 
> 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

or wait until it trickles upwards to Linus, most likely -rc3.

Thanks for the report. Good to know what else broke.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/