Messages in this thread | | | Date | Mon, 08 Feb 2010 01:30:10 -0800 | From | "H. Peter Anvin" <> | Subject | Re: linux-next: add utrace tree |
| |
On 02/07/2010 10:54 PM, Pavel Machek wrote: >> >> No, it has nothing to do with ring. It has to do with modifying code >> that another CPU could be executing at the same time, and with modifying >> code on the same processor through another virtual alias (they are >> different issues.) The same issues apply regardless of the CPL of the >> processor. > > ...but these are always 'there could be cpu bugs around' issues, > right? Like amd k6. AFAICT x86 always supported self-modifying code > without any extra barriers needed... >
*Self*-modifying code, yes. *Cross*-modifying code, no.
-hpa
| |