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    SubjectRe: [PATCH c/r -mm] c/r: prctl: Simplify PR_SET_MM on mm::code/data assignment
    On 04/17/2012 08:26 PM, Kees Cook wrote:
    > On Mon, Apr 16, 2012 at 3:55 PM, Cyrill Gorcunov <> wrote:
    >> The mm::start_code, end_code, start_data, end_data members
    >> are set during startup of executable file and are not changed
    >> after.
    >> But the program itself might map new executable or/and data areas in
    >> time so the original values written into mm fields mentioned above
    >> might not have correspond VMA area at all, thus if one try to
    >> use this prctl codes without underlied VMA, the error will be
    >> returned.
    > Hrm, what is the utility of these fields then? If they're not "real",
    > should the kernel even bother tracking it at all? (Or, should it be
    > fixed to actually do something useful?)

    As far as I see these values are used by aout binfmt core-dumping code
    and in flat relocations load. Elf doesn't read either of them, just loads.

    > -Kees

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