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    SubjectRe: AUDIT of 2.5.15 copy_to/from_user
    On Sun, 19 May 2002, Alan Cox wrote:
    > >
    > > On the emu10k1 driver we use access_ok(VERIFY_READ) once at the beginning
    > > of the write() routine to check we can access the user buffer. After that
    > > we always use __copy_from_user() and we trust it not to fail. Is this
    > > correct, or not?
    >
    > This is correct

    Am I right to read that as "This is a correct description of what is
    currently done in the emu10k1 driver, but what it is doing is incorrect"?

    > Static once off checks are done in access_ok
    > Dynamic checks are doing in __copy_from_*
    >
    > Which are which depends on the platform. On x86 for example access_ok
    > is basically a check for 0->0xBFFFFFFF range and no more

    Hugh

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