linux-kernel - Re: [v7, 05/11] x86/retpoline/entry: Convert entry assembler indirect jumps

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Date:   Tue, 9 Jan 2018 20:39:21 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Andi Kleen <ak@...ux.intel.com>,
        Andrei Vagin <avagin@...tuozzo.com>
Cc:     "Woodhouse, David" <dwmw@...zon.co.uk>,
        Paul Turner <pjt@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>, tglx@...utronix.de,
        Kees Cook <keescook@...gle.com>,
        Rik van Riel <riel@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...capital.net>,
        Jiri Kosina <jikos@...nel.org>, gnomes@...rguk.ukuu.org.uk,
        x86@...nel.org
Subject: Re: [v7, 05/11] x86/retpoline/entry: Convert entry assembler indirect
 jumps

On 01/09/2018 08:30 PM, Andi Kleen wrote:
> On Tue, Jan 09, 2018 at 07:54:08PM -0800, Andrei Vagin wrote:
>>
>> In my test environment, the kernel with this patch crashes.
> 
> I posted a patch for this.

It's called:

[PATCH v3 2/3] x86/retpoline: Use better sequences for NOSPEC_CALL/JMP

right, Andi?

BTW, that's a fun oops.  It looks like it's call'ing (or jumping) to an
address that's used by cpu_entry_area->exception_stacks[1].