linux-kernel - Re: [PATCH v3 01/13] x86/retpoline: Add initial retpoline support

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Date:   Thu, 4 Jan 2018 10:03:17 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     David Woodhouse <dwmw@...zon.co.uk>
Cc:     ak@...ux.intel.com, Paul Turner <pjt@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Thomas Gleixner <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
Subject: Re: [PATCH v3 01/13] x86/retpoline: Add initial retpoline support

David,
 these are all marked as spam, because your emails have screwed up
DKIM. You used

    From: David Woodhouse <dwmw@...zon.co.uk>

but then you used infradead as a mailer, so it has the DKIM signature
from infradead, not from Amazon.co.uk.

The DKIM signature does pass for infradead, but amazon dmarc - quite
reasonably - wants the from to match.

End result:

       dmarc=fail (p=QUARANTINE sp=QUARANTINE dis=QUARANTINE)
header.from=amazon.co.uk

and everything was in spam.

Please don't do this. There's enough spam in the world that we don't
need people mis-configuring their emails and making real emails look
like spam too.

               Linus

On Thu, Jan 4, 2018 at 6:36 AM, David Woodhouse <dwmw@...zon.co.uk> wrote:
> Enable the use of -mindirect-branch=thunk-extern in newer GCC, and provide
> the corresponding thunks. Provide assembler macros for invoking the thunks
> in the same way that GCC does, from native and inline assembler.