linux-kernel - Re: [RFC PATCH] x86/mm/fault: Allow stack access below %rsp

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Message-ID: <cc560b0b-b336-1dac-7cc0-5e509bb004ee@intel.com>
Date:   Mon, 5 Nov 2018 09:51:31 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Waiman Long <longman@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>
Cc:     "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] x86/mm/fault: Allow stack access below %rsp

On 11/5/18 8:27 AM, Waiman Long wrote:
> So gcc had changed to avoid doing that, but my main concern are old
> binaries that were compiled with old gcc.

Yeah, fair enough.

FWIW, I don't have any strong feelings about this patch either way, but
supporting old binaries/compilers without crashing seems fairly
important.  I'm yet to see any major downsides to your patch.