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    SubjectRe: [ 043/218] ARM: 7527/1: uaccess: explicitly check __user pointer when !CPU_USE_DOMAINS
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    On Fri, 2012-09-28 at 13:14 -0700, Greg Kroah-Hartman wrote:
    > 3.4-stable review patch. If anyone has any objections, please let me know.
    >
    > ------------------
    >
    > From: Russell King <rmk+kernel@arm.linux.org.uk>
    >
    > commit 8404663f81d212918ff85f493649a7991209fa04 upstream.
    >
    > The {get,put}_user macros don't perform range checking on the provided
    > __user address when !CPU_HAS_DOMAINS.
    >
    > This patch reworks the out-of-line assembly accessors to check the user
    > address against a specified limit, returning -EFAULT if is is out of
    > range.
    >
    > [will: changed get_user register allocation to match put_user]
    > [rmk: fixed building on older ARM architectures]
    [...]

    It looks like this is needed for at least some older kernel versions,
    but a backported version will be needed for 3.2 and earlier.

    Ben.

    --
    Ben Hutchings
    Usenet is essentially a HUGE group of people passing notes in class.
    - Rachel Kadel, `A Quick Guide to Newsgroup Etiquette'
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