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Date:   Thu, 5 Oct 2017 17:38:40 +0000
From:   "Neri, Ricardo" <ricardo.neri@...el.com>
To:     "bp@...e.de" <bp@...e.de>
CC:     "corbet@....net" <corbet@....net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "Ren, Qiaowei" <qiaowei.ren@...el.com>,
        "adam.buchbinder@...il.com" <adam.buchbinder@...il.com>,
        "colin.king@...onical.com" <colin.king@...onical.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "adanhawthorn@...il.com" <adanhawthorn@...il.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "ray.huang@....com" <ray.huang@....com>,
        "joe@...ches.com" <joe@...ches.com>,
        "vbabka@...e.cz" <vbabka@...e.cz>,
        "mst@...hat.com" <mst@...hat.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "hpa@...or.com" <hpa@...or.com>,
        "brgerst@...il.com" <brgerst@...il.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "luto@...nel.org" <luto@...nel.org>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        "mhiramat@...nel.org" <mhiramat@...nel.org>,
        "jslaby@...e.cz" <jslaby@...e.cz>,
        "liverlint@...il.com" <liverlint@...il.com>,
        "Gortmaker, Paul (Wind River)" <paul.gortmaker@...driver.com>,
        "cmetcalf@...lanox.com" <cmetcalf@...lanox.com>,
        "slaoub@...il.com" <slaoub@...il.com>,
        "shuah@...nel.org" <shuah@...nel.org>,
        "lstoakes@...il.com" <lstoakes@...il.com>
Subject: Re: [PATCH v9 06/29] x86/mpx: Use signed variables to compute
 effective addresses

On Thu, 2017-10-05 at 11:41 +0200, Borislav Petkov wrote:
> On Tue, Oct 03, 2017 at 08:54:09PM -0700, Ricardo Neri wrote:
> > 
> > Even though memory addresses are unsigned, the operands used to compute the
> > effective address do have a sign. This is true for ModRM.rm, SIB.base,
> > SIB.index as well as the displacement bytes. Thus, signed variables shall
> > be used when computing the effective address from these operands. Once the
> > signed effective address has been computed, it is casted to an unsigned
> > long to determine the linear address.
> > 
> > Variables are renamed to better reflect the type of address being
> > computed.
> > 
> > Cc: Borislav Petkov <bp@...e.de>
> > Cc: Andy Lutomirski <luto@...nel.org>
> > Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> > Cc: Adam Buchbinder <adam.buchbinder@...il.com>
> > Cc: Colin Ian King <colin.king@...onical.com>
> > Cc: Lorenzo Stoakes <lstoakes@...il.com>
> > Cc: Qiaowei Ren <qiaowei.ren@...el.com>
> > Cc: Peter Zijlstra <peterz@...radead.org>
> > Cc: Nathan Howard <liverlint@...il.com>
> > Cc: Adan Hawthorn <adanhawthorn@...il.com>
> > Cc: Joe Perches <joe@...ches.com>
> > Cc: Ravi V. Shankar <ravi.v.shankar@...el.com>
> > Cc: x86@...nel.org
> > Signed-off-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
> > ---
> >  arch/x86/mm/mpx.c | 20 ++++++++++++++------
> >  1 file changed, 14 insertions(+), 6 deletions(-)
> Reviewed-by: Borislav Petkov <bp@...e.de>

Thank you!

BR,
Ricardo

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