Tue, Oct 31, 2017 at 03:59:08PM CET, dsah...@gmail.com wrote: >On 10/31/17 1:41 AM, Jiri Pirko wrote: >>> >>> If it is read-only, then attempts to set it from userspace should cause >>> the command to fail. >> >> That breaks uapi. Consider existing userspace app sending garbage in >> that bit and new kernel which randomly fails upon the garbage. >> > >It is called syzkaller. The kernel should always validate userspace >config including checking that unused bits are 0. So you are saying tc >has never done that checking and just ignored bits that are not valid?
Not sure if in 100% of cases but in this case, yes.
