linux-kernel - Re: [PATCH v12 10/11] sparc64: Add support for ADI (Application Data Integrity)

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Message-ID: <8b0edd2e-3e9b-1148-6309-38b61307a523@linux.intel.com>
Date:   Mon, 5 Mar 2018 13:31:02 -0800
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     Khalid Aziz <khalid.aziz@...cle.com>, davem@...emloft.net,
        akpm@...ux-foundation.org
Cc:     corbet@....net, bob.picco@...cle.com, steven.sistare@...cle.com,
        pasha.tatashin@...cle.com, mike.kravetz@...cle.com,
        rob.gardner@...cle.com, mingo@...nel.org, nitin.m.gupta@...cle.com,
        anthony.yznaga@...cle.com, kirill.shutemov@...ux.intel.com,
        tom.hromatka@...cle.com, allen.pais@...cle.com,
        tklauser@...tanz.ch, shannon.nelson@...cle.com,
        vijay.ac.kumar@...cle.com, mhocko@...e.com, jack@...e.cz,
        punit.agrawal@....com, hughd@...gle.com, thomas.tai@...cle.com,
        ross.zwisler@...ux.intel.com, dave.jiang@...el.com,
        willy@...radead.org, minchan@...nel.org,
        imbrenda@...ux.vnet.ibm.com, aarcange@...hat.com,
        kstewart@...uxfoundation.org, pombredanne@...b.com,
        tglx@...utronix.de, gregkh@...uxfoundation.org,
        nagarathnam.muthusamy@...cle.com, linux@...ck-us.net,
        jane.chu@...cle.com, dan.j.williams@...el.com, jglisse@...hat.com,
        ktkhai@...tuozzo.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        sparclinux@...r.kernel.org, Khalid Aziz <khalid@...ehiking.org>
Subject: Re: [PATCH v12 10/11] sparc64: Add support for ADI (Application Data
 Integrity)

On 03/05/2018 01:14 PM, Khalid Aziz wrote:
> Are you suggesting that vma returned by find_vma() could be split or
> merged underneath me if I do not hold mmap_sem and thus make the flag
> check invalid? If so, that is a good point.

This part does make me think that this code hasn't been tested very
thoroughly.  Could you describe the testing that you have done?  For MPX
and protection keys, I added something to tools/testing/selftests/x86,
for instance.