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    Subject[PATCH] vmsplice exploit fix (was: splice: fix user pointer access in get_iovec_page_array)
    Kudos to all involved in the rapid response.  But.

    Information on patching this vulnerability is not available front and
    center in many of the places you would expect: front page, front page, covered on but without a
    pointer to the patch, and so on. So this post provides a subject line
    for Google to find, and for good measure mentions the word


    I think many users would first go to on a day like today, as
    I did. Nothing to see there. We could do a way better job of getting
    the word out.

    Patch attached as posted above by Pekka. For the mortals among us:

    cd linux-2.6.recent && patch <fix.vmsplice.exploit.patch -p1


    Cc: <>
    Cc: Jens Axboe <>
    Cc: Andrew Morton <>
    Signed-off-by: Pekka Enberg <>
    Bastian, can I have your Signed-off-by for this, please? Oliver, Niki, can
    you please confirm this closes the hole?

    fs/splice.c | 3 +++
    1 file changed, 3 insertions(+)

    Index: linux-2.6/fs/splice.c
    --- linux-2.6.orig/fs/splice.c
    +++ linux-2.6/fs/splice.c
    @@ -1237,6 +1237,9 @@ static int get_iovec_page_array(const st
    if (unlikely(!base))

    + if (unlikely(!access_ok(VERIFY_READ, base, len)))
    + break;
    * Get this base offset and number of pages, then map
    * in the user pages.
     \ /
      Last update: 2008-02-11 08:33    [W:0.035 / U:7.120 seconds]
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