linux-kernel - Re: [PATCH v10 18/18] x86/insn-eval: Incorporate segment base in linear address computation

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Message-ID: <20171101190839.GA23180@voyager>
Date:   Wed, 1 Nov 2017 12:08:39 -0700
From:   Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
To:     Borislav Petkov <bp@...e.de>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Brian Gerst <brgerst@...il.com>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Huang Rui <ray.huang@....com>, Jiri Slaby <jslaby@...e.cz>,
        Jonathan Corbet <corbet@....net>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Chen Yucong <slaoub@...il.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org,
        x86@...nel.org, ricardo.neri@...el.com,
        Adam Buchbinder <adam.buchbinder@...il.com>,
        Colin Ian King <colin.king@...onical.com>,
        Lorenzo Stoakes <lstoakes@...il.com>,
        Qiaowei Ren <qiaowei.ren@...el.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kees Cook <keescook@...omium.org>,
        Thomas Garnier <thgarnie@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH v10 18/18] x86/insn-eval: Incorporate segment base in
 linear address computation

On Wed, Nov 01, 2017 at 06:56:42PM +0100, Borislav Petkov wrote:
> On Fri, Oct 27, 2017 at 01:25:45PM -0700, Ricardo Neri wrote:
> > insn_get_addr_ref() returns the effective address as defined by the
> > section 3.7.5.1 Vol 1 of the Intel 64 and IA-32 Architectures Software
> > Developer's Manual. In order to compute the linear address, we must add
> > to the effective address the segment base address as set in the segment
> > descriptor. The segment descriptor to use depends on the register used as
> > operand and segment override prefixes, if any.
> > 
> > In most cases, the segment base address will be 0 if the USER_DS/USER32_DS
> > segment is used or if segmentation is not used. However, the base address
> > is not necessarily zero if a user programs defines its own segments. This
> > is possible by using a local descriptor table.
> > 
> > Since the effective address is a signed quantity, the unsigned segment
> > base address is saved in a separate variable and added to the final,
> > unsigned, effective address.
> > 
> > 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: Arnaldo Carvalho de Melo <acme@...hat.com>
> > Cc: Masami Hiramatsu <mhiramat@...nel.org>
> > Cc: Adrian Hunter <adrian.hunter@...el.com>
> > Cc: Kees Cook <keescook@...omium.org>
> > Cc: Thomas Garnier <thgarnie@...gle.com>
> > Cc: Peter Zijlstra <peterz@...radead.org>
> > Cc: Borislav Petkov <bp@...e.de>
> > Cc: Dmitry Vyukov <dvyukov@...gle.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/lib/insn-eval.c | 55 +++++++++++++++++++++++++++++++++++++++++++++---
> >  1 file changed, 52 insertions(+), 3 deletions(-)
> 
> Reviewed-by: Borislav Petkov <bp@...e.de>

Thank you Borislav! This should complete tne review of this series. As proposed
earier [1], I guess that, if the tip maintainers are OK, this series can be merged
in the tip tree?

BR,
Ricardo

[1]. https://lkml.org/lkml/2017/10/20/851