[lkml]   [2003]   [Oct]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [RFC] prevent "dd if=/dev/mem" crash
    Bjorn Helgaas <> wrote:
    > Old behavior:
    > # dd if=/dev/mem of=/dev/null
    > <unrecoverable machine check>

    I recently fixed this for ia32 by changing copy_to_user() to not oops if
    the source address generated a fault. Similarly copy_from_user() returns
    an error if the destination generates a fault.

    In other words: drivers/char/mem.c requires that the architecture's
    copy_*_user() functions correctly handle faults on either the source or
    dest of the copy.

    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2005-03-22 13:58    [W:0.020 / U:1.072 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site