On 04/23/2015 10:09 AM, Yu, Fenghua wrote: >> > If those untouched fields of the xsave buffer are in the "init state", then >> > we've got no problem. But, are those "untouched since (1)" fields in the >> > kernel xsave buf *GUARANTEED* to be in the init state? > In fact, those untouched fields in kernel xsave buf "IS GUARANTEED" to be in > the init state. > > Please check __sanitize_i387_state() called just before copy_to_user_xstate(). > That functions GUARANTEES the untouched fields in kernel xsave buf to be in > init state.
OK, that makes sense. Other than the horribly-named sanitize_i387_state(). :) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
