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    SubjectRe: [PATCH] Re: SSE related security hole


    On Sat, 20 Apr 2002, Andrea Arcangeli wrote:
    >
    > I mean, if they change the registers layout, and so if they require a
    > different empty FPU state, they must as well add yet another bitflag to
    > enable SSE3, if they don't the chip isn't backwards compatible.

    I have unofficial confirmation from Intel that the way to architecturally
    initialize the FPU state is indeed something like

    memset(&fxsave, 0, sizeof(struct i387_fxsave_struct));
    fxsave.cwd = 0x37f;
    fxsave.mxcsr = 0x1f80;
    fxrstor(&fxsave);

    and the person in question is trying to make sure this is documented so
    that we won't be bitten by this in the future.

    Linus

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