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    SubjectRe: Unexecutable stack
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    Steve VanDevender <stevev@efn.org> said:

    [...]

    > In theory it is possible to write executable code into a buffer
    > in the data segment and overflow a buffer in the stack so that
    > the stack frame contains a return address that points into that
    > data. In practice it is much harder to create an exploit with
    > this method as it requires quite detailed knowledge of the data
    > segment layout.

    Yep, it is somewhat harder, and thus not done regularly by crackers today,
    as this is rarely needed now. If/when this becomes common, the cracks will
    become common too. Then we are where we started. Better than buying (false)
    security is to fix the affected programs.
    --
    Dr. Horst H. von Brand mailto:vonbrand@inf.utfsm.cl
    Departamento de Informatica Fono: +56 32 654431
    Universidad Tecnica Federico Santa Maria +56 32 654239
    Casilla 110-V, Valparaiso, Chile Fax: +56 32 797513

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