linux-kernel - Re: 9f4835fb96 ("x86/fpu: Tighten validation of user-supplied .."): Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b

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Message-ID: <20170926001947.7ceoek4wt7fvuchz@wfg-t540p.sh.intel.com>
Date:   Tue, 26 Sep 2017 08:19:47 +0800
From:   Fengguang Wu <wfg@...ux.intel.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Eric Biggers <ebiggers@...gle.com>, LKP <lkp@...org>,
        linux-kernel@...r.kernel.org, Rik van Riel <riel@...hat.com>,
        Kees Cook <keescook@...omium.org>
Subject: Re: 9f4835fb96 ("x86/fpu: Tighten validation of user-supplied .."):
 Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b

On Mon, Sep 25, 2017 at 04:55:09PM +0200, Ingo Molnar wrote:
>
>* Fengguang Wu <wfg@...ux.intel.com> wrote:
>
>> On Mon, Sep 25, 2017 at 10:20:13AM +0800, kernel test robot wrote:
>> > Hi Ingo,
>> >
>> > On your request I'm resending the report here, with attached dmesg,
>> > kconfig and reproduce script.
>> >
>> > I'll go on to test your split up commits, too.
>> >
>> > https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/fpu
>>
>> It looks 6fc19a42 ("x86/fpu: Use validate_xstate_header() to validate
>> the xstate_header in sanitize_restored_xstate()") is the first bad commit.
>
>Thank you! Could you check that the latest tip:master or tip:WIP.x86/fpu
>(9cff7344187e) fixes this crash?

Yes, both of them are free from that crash. :)

Regards,
Fengguang