linux-kernel - Re: [PATCH 1/2] mm/hmm: hmm_range

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20190824223754.GA21891@lst.de>
Date:   Sun, 25 Aug 2019 00:37:54 +0200
From:   Christoph Hellwig <hch@....de>
To:     Ralph Campbell <rcampbell@...dia.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org,
        Jérôme Glisse <jglisse@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 1/2] mm/hmm: hmm_range_fault() NULL pointer bug

On Fri, Aug 23, 2019 at 03:17:52PM -0700, Ralph Campbell wrote:
> Although hmm_range_fault() calls find_vma() to make sure that a vma exists
> before calling walk_page_range(), hmm_vma_walk_hole() can still be called
> with walk->vma == NULL if the start and end address are not contained
> within the vma range.

Should we convert to walk_vma_range instead?  Or keep walk_page_range
but drop searching the vma ourselves?

Except for that the patch looks good to me:

Reviewed-by: Christoph Hellwig <hch@....de>