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: <20170924111117.7nftqa2g5lnzn7xr@gmail.com>
Date:   Sun, 24 Sep 2017 13:11:17 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     kernel test robot <fengguang.wu@...el.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>, wfg@...ux.intel.com,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: 9f4835fb96 ("x86/fpu: Tighten validation of user-supplied .."):
 Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b


* kernel test robot <fengguang.wu@...el.com> wrote:

> Greetings,
> 
> 0day kernel testing robot got the below dmesg and the first bad commit is
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/fpu
> 
> commit 9f4835fb965d8eea7e608d0cb62c246c804dec90
> Author:     Eric Biggers <ebiggers@...gle.com>
> AuthorDate: Fri Sep 22 10:41:55 2017 -0700
> Commit:     Ingo Molnar <mingo@...nel.org>
> CommitDate: Sat Sep 23 11:02:00 2017 +0200
> 
>     x86/fpu: Tighten validation of user-supplied xstate_header

Would it be possible to re-start this bisection, now that I've split up the commit 
into 10 more obvious patches?

My guess is that it's one of these two that is the bad commit:

  3deb4cca945b: x86/fpu: Copy the full header in copy_user_to_xstate()
  cfbd048cce44: x86/fpu: Copy the full state_header in copy_kernel_to_xstate()

... but it could be some of the others as well.

Thanks,

	Ingo