linux-kernel - Re: [PATCH] x86/signals: Fix lower/upper bound reporting in compat siginfo

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Message-ID: <20170404215349.GT7266@8bytes.org>
Date:   Tue, 4 Apr 2017 23:53:49 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Joerg Roedel <jroedel@...e.de>, linux-kernel@...r.kernel.org,
        Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH] x86/signals: Fix lower/upper bound reporting in compat
 siginfo

On Tue, Apr 04, 2017 at 09:56:45AM -0700, Dave Hansen wrote:
> On 04/04/2017 09:15 AM, Joerg Roedel wrote:
> > Put the right values from the original siginfo into the
> > userspace compat-siginfo.
> > 
> > This fixes the 32-bit mpx tabletest on a 64-bit kernel.
> 
> Ugh, thanks for finding that.

Yeah, I was also looking at the vaddrexhaust test, but is that supposed
to work? It does pretty weird things at least, on 64 bit the function
effectivly does nothing because nr_to_fill evaluates to 0 there, and on
32 bit it gets a (probably #BF) exception which is not caught, so that
the test fails.

I am a bit confused, but maybe I just didn't stare long enough at it :-)
Hope you can sched some light on it.

	Joerg