linux-kernel - Re: drivers/pci/hotplug/ibmphp_ebda.c:409:1: warning: the frame size of 1108 bytes is larger than 1024 bytes

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Date:   Wed, 19 Oct 2016 00:17:07 +0200
From:   Emese Revfy <re.emese@...il.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     kbuild test robot <fengguang.wu@...el.com>, kbuild-all@...org,
        LKML <linux-kernel@...r.kernel.org>,
        "pageexec@...email.hu" <pageexec@...email.hu>,
        "spender@...ecurity.net" <spender@...ecurity.net>
Subject: Re: drivers/pci/hotplug/ibmphp_ebda.c:409:1: warning: the frame
 size of 1108 bytes is larger than 1024 bytes

On Tue, 18 Oct 2016 15:05:39 -0700
Kees Cook <keescook@...omium.org> wrote:

> On Tue, Oct 18, 2016 at 2:36 PM, Emese Revfy <re.emese@...il.com> wrote:
> > On Tue, 18 Oct 2016 13:57:35 -0700
> > Kees Cook <keescook@...omium.org> wrote:
> >
> >> This is controlled by CONFIG_FRAME_WARN. I don't think this is a
> >> particular problem or should be avoided, but perhaps we can set the
> >> default to 2048 (as done on 64BIT) if we're building with the entropy
> >> plugin.
> >
> > This is probably a gcc code generation bug on i386 when a plugin uses too many 64 bit variables
> > so I think PaX Team's patch will be the best solution.
> 
> Okay, cool. If you're able, please CC me with the fix when it happens. :)

This is the plugin side fix:
https://github.com/ephox-gcc-plugins/latent_entropy/commit/12776eab89861239d5194a9241a98e48e3b3e8ae

The kernel side fix will be released in PaX for linux 4.8.

-- 
Emese