linux-kernel - Re: x86-64: Maintain 16-byte stack alignment

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Message-ID: <20170113084349.GE22022@gondor.apana.org.au>
Date:   Fri, 13 Jan 2017 16:43:49 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andy Lutomirski <luto@...capital.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: Re: x86-64: Maintain 16-byte stack alignment

On Thu, Jan 12, 2017 at 11:07:09PM -0600, Josh Poimboeuf wrote:
> 
> Disabling frame pointers didn't seem to help, but I finally got it to
> misalign with a different test case.  I think it had been aligning the
> array, so instead I made it push a register.

Right.  If you start manipulating the stack directly then all bets
are off.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt