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    SubjectRe: [PATCH] New phys_addr() syscall
    On Mon, 20 Jul 1998, Richard Gooch wrote:

    > Just so I'm clear on this: I'm in no way saying that phys_addr(2)
    > combined with mlock(2) is the proper way to do this. I just wanted to
    > point out that you *could*, if you wanted. Sigh. Maybe I shouldn't
    > have mentioned that aspect at all.

    I'm wondering if phys_addr(2) could be used in combination with
    mlock(2) to fragment physical memory.

    Could an attacker:

    for() {
    allocate a large block of memory and page it in (memset(base, 1, size))
    scan the block with phys_addr(2) looking for blocks matching a pattern
    (eg. every second block)
    mlock those blocks
    }

    This simple version could be easily defeated with ulimit, but is it
    possible a more sophisticated version wouldn't be?


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