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    SubjectRe: cryptoapi incorrect struct page usage
    On Sat, 09 Aug 2003 23:33:52 +0300
    Mika Penttilä <mika.penttila@kolumbus.fi> wrote:

    > sg[elt].page = virt_to_page(skb->data + offset);
    > sg[elt].offset = (unsigned long)(skb->data + offset) % PAGE_SIZE;
    > sg[elt].length = copy;
    >
    > so unpinned pages are passed to cryptoapi. Nothing prevents these pages
    > from being swapped out. Something like get_user_pages() is needed to pin
    > these pages for the duration of crypto operations. Comments?

    The page at skb->data was allocated by the skbuff allocation
    layer, it has therefore a lifetime the size of the SKB itself.

    The crypto API call is finished before we can possibly free up
    the SKB, so nothing bad can happen.
    -
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