linux-kernel - Re: [PATCH] mm/shmem: Zero out unused vma fields in shmem_pseudo_vma

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Message-ID: <alpine.LSU.2.11.1805311635410.13735@eggly.anvils>
Date:   Thu, 31 May 2018 16:37:10 -0700 (PDT)
From:   Hugh Dickins <hughd@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Hugh Dickins <hughd@...gle.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/shmem: Zero out unused vma fields in
 shmem_pseudo_vma_init()

On Thu, 31 May 2018, Andrew Morton wrote:
> On Thu, 31 May 2018 16:56:02 +0300 "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> wrote:
> 
> > shmem/tmpfs uses pseudo vma to allocate page with correct NUMA policy.
> > 
> > The pseudo vma doesn't have vm_page_prot set. We are going to encode
> > encryption KeyID in vm_page_prot. Having garbage there causes problems.
> > 
> > Zero out all unused fields in the pseudo vma.
> > 
> 
> So there are no known problems in the current mainline kernel?

Correct - if we limit ourselves to the area of the shmem pseudo-vma :)

Hugh