linux-kernel - Re: [PATCH 05/16] mm: Protect VMA modifications using VMA sequence count

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Message-Id: <f935091a-d8f9-1951-8397-f5c464a2b922@linux.vnet.ibm.com>
Date:   Wed, 9 Aug 2017 12:43:33 +0200
From:   Laurent Dufour <ldufour@...ux.vnet.ibm.com>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     paulmck@...ux.vnet.ibm.com, peterz@...radead.org,
        akpm@...ux-foundation.org, ak@...ux.intel.com, mhocko@...nel.org,
        dave@...olabs.net, jack@...e.cz,
        Matthew Wilcox <willy@...radead.org>, benh@...nel.crashing.org,
        mpe@...erman.id.au, paulus@...ba.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, hpa@...or.com,
        Will Deacon <will.deacon@....com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        haren@...ux.vnet.ibm.com, khandual@...ux.vnet.ibm.com,
        npiggin@...il.com, bsingharora@...il.com,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        linuxppc-dev@...ts.ozlabs.org, x86@...nel.org
Subject: Re: [PATCH 05/16] mm: Protect VMA modifications using VMA sequence
 count

On 09/08/2017 12:12, Kirill A. Shutemov wrote:
> On Tue, Aug 08, 2017 at 04:35:38PM +0200, Laurent Dufour wrote:
>> The VMA sequence count has been introduced to allow fast detection of
>> VMA modification when running a page fault handler without holding
>> the mmap_sem.
>>
>> This patch provides protection agains the VMA modification done in :
>> 	- madvise()
>> 	- mremap()
>> 	- mpol_rebind_policy()
>> 	- vma_replace_policy()
>> 	- change_prot_numa()
>> 	- mlock(), munlock()
>> 	- mprotect()
>> 	- mmap_region()
>> 	- collapse_huge_page()
> 
> I don't thinks it's anywhere near complete list of places where we touch
> vm_flags. What is your plan for the rest?

The goal is only to protect places where change to the VMA is impacting the
page fault handling. If you think I missed one, please advise.

Thanks,
Laurent.