On Sat, Apr 10, 2021 at 11:52 AM Andi Kleen <a...@linux.intel.com> wrote: > > Borislav Petkov <b...@alien8.de> writes: > > > From: Borislav Petkov <b...@suse.de> > > Date: Sat, 10 Apr 2021 14:08:13 +0200 > > > > There are a bunch of MSRs which luserspace has no business poking at, > > whatsoever. Add a ban list and put the TSC-related MSRs in there. Issue > > a big juicy splat to catch offenders. > > Have you ever seen any user programs actually write those MSRs? > I don't see why they ever would, it's not that they have any motivation > to do it (unlike SMM), and I don't know of any examples.
I have actually seen real user programs poke MSR_SYSCALL_MASK.
