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    SubjectRe: Direct access to hardware
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    James Sutherland <jas88@cam.ac.uk> said:
    > On Tue, 25 Jul 2000, Horst von Brand wrote:

    [...]

    > > Please show me where Linux checks every byte of an executable before
    > > running it to make sure it doesn't f00f or coma your CPU.

    > Inside the CPU, in hardware. If you attempt to execute invalid code, Linux
    > knows about it straight away.

    I.e., Linux (the kernel) does _no_ checking at all, it gets notified by the
    hardware when something is awry. Exactly the same thing as I advocate for
    hard disks et al: They have to protect themselves, and notify <somebody>
    when things do go wrong.

    Thanks.
    --
    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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