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    SubjectRe: [RFC] x86: xsave/xrstor support, ucontext_t extensions
    > I don't think there is one. We never copy fxsave completely out of the
    > kernel. x86-64 does FXSAVE directly in/out user space, but the
    > only leak is what there was before.

    ptrace/user_regset copies out and in the whole fxsave block from the ptrace
    caller. (Only the mxcsr word is constrained after copy-in.)


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