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: <20170926062505.jm3euf5bihcnzhdt@gmail.com>
Date:   Tue, 26 Sep 2017 08:25:05 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Fengguang Wu <wfg@...ux.intel.com>
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

* Fengguang Wu <wfg@...ux.intel.com> wrote:

> 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. :)

Great, thanks!

	Ingo