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From:   Jann Horn <jannh@google.com>
Date:   Tue, 22 Sep 2020 00:47:11 +0200
Message-ID: <CAG48ez25krKvd5hWqn0R3w5_AAPVWtWKofiOHEfKaB2+YoDoPw@mail.gmail.com>
Subject: Re: [PATCH 1/5] mm: Introduce mm_struct.has_pinned
To:     Peter Xu <peterx@redhat.com>
Cc:     Linux-MM <linux-mm@kvack.org>,
        kernel list <linux-kernel@vger.kernel.org>,
        Jason Gunthorpe <jgg@ziepe.ca>,
        Andrew Morton <akpm@linux-foundation.org>,
        Jan Kara <jack@suse.cz>, Michal Hocko <mhocko@suse.com>,
        Kirill Tkhai <ktkhai@virtuozzo.com>,
        Kirill Shutemov <kirill@shutemov.name>,
        Hugh Dickins <hughd@google.com>,
        Christoph Hellwig <hch@lst.de>,
        Andrea Arcangeli <aarcange@redhat.com>,
        John Hubbard <jhubbard@nvidia.com>,
        Oleg Nesterov <oleg@redhat.com>,
        Leon Romanovsky <leonro@nvidia.com>,
        Linus Torvalds <torvalds@linux-foundation.org>
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On Tue, Sep 22, 2020 at 12:30 AM Peter Xu <peterx@redhat.com> wrote:
> On Mon, Sep 21, 2020 at 11:43:38PM +0200, Jann Horn wrote:
> > On Mon, Sep 21, 2020 at 11:17 PM Peter Xu <peterx@redhat.com> wrote:
> > > (Commit message collected from Jason Gunthorpe)
> > >
> > > Reduce the chance of false positive from page_maybe_dma_pinned() by keeping
> > > track if the mm_struct has ever been used with pin_user_pages(). mm_structs
> > > that have never been passed to pin_user_pages() cannot have a positive
> > > page_maybe_dma_pinned() by definition.
> >
> > There are some caveats here, right? E.g. this isn't necessarily true
> > for pagecache pages, I think?
>
> Sorry I didn't follow here.  Could you help explain with some details?

The commit message says "mm_structs that have never been passed to
pin_user_pages() cannot have a positive page_maybe_dma_pinned() by
definition"; but that is not true for pages which may also be mapped
in a second mm and may have been passed to pin_user_pages() through
that second mm (meaning they must be writable over there and not
shared with us via CoW).

For example:

Process A:

fd_a = open("/foo/bar", O_RDWR);
mapping_a = mmap(NULL, 0x1000, PROT_READ|PROT_WRITE, MAP_SHARED, fd_a, 0);
pin_user_pages(mapping_a, 1, ...);

Process B:

fd_b = open("/foo/bar", O_RDONLY);
mapping_b = mmap(NULL, 0x1000, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd_b, 0);
*(volatile char *)mapping_b;

At this point, process B has never called pin_user_pages(), but
page_maybe_dma_pinned() on the page at mapping_b would return true.


I don't think this is a problem for the use of page_maybe_dma_pinned()
in fork(), but I do think that the commit message is not entirely
correct.