Re: [RFC] x86: xsave/xrstor support, ucontext_t extensions

From: Roland McGrath
Date: Tue May 20 2008 - 16:11:30 EST

> 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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