On Fri, 12 Sep 2014, H. Peter Anvin wrote: > The correct limit is 15 bytes, not anything else, so this is a bug in > the existing decoder. A sequence of bytes longer than 15 bytes will Fine. Lets fix it there. > #UD, regardless of being "otherwise valid". > Keep in mind the instruction may not be aligned, and you could fit an > instruction plus a jump and still overrun a page in 15 bytes. Fair enough. OTOH, I doubt that a text mapping will end exactly at that jump after the MPX instruction. So that's simple to fix. Kill the hardcoded limit in lib/insn.c and let the callsites hand in a lenght argument. So you can still use it for MPX and avoid 200 lines of blindly copied and slightly different decoder code. Thanks, tglx -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>