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    SubjectRe: [PATCH 4/4] Swap migration V3: sys_migrate_pages interface
    Date
    On Friday 21 October 2005 10:47, Christoph Lameter wrote:
    > On Fri, 21 Oct 2005, Paul Jackson wrote:
    > > * Christoph - what is the permissions check on sys_migrate_pages()?
    > > It would seem inappropriate for 'guest' to be able to move the
    > > memory of 'root'.
    >
    > The check is missing.
    >

    That code used to be there. Basically the check was that if you could
    legally send a signal to the process, you could migrate its memory.
    Go back and look and my patches for this.

    Why was this dropped, arbitrarily?

    > Maybe we could add:
    >
    > if (!capable(CAP_SYS_RESOURCE))
    > return -EPERM;
    >
    > Then we may also decide that root can move any process anywhere and drop
    > the retrieval of the mems_allowed from the other task.
    >
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    --
    Ray Bryant
    AMD Performance Labs Austin, Tx
    512-602-0038 (o) 512-507-7807 (c)

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