On Sun, Apr 11, 2021 at 04:21:21PM -0700, Andy Lutomirski wrote:
> https://bugs.winehq.org/show_bug.cgi?id=33275#c19
>
> I sure hope no one is still doing this.
Aha, IRET with rFLAGS.NT set. At least it is only an ad-hoc program to
fix this particular issue and I hope too it hasn't propagated
On Sun, Apr 11, 2021 at 10:04 AM Borislav Petkov wrote:
>
> On Sun, Apr 11, 2021 at 09:57:20AM -0700, Andy Lutomirski wrote:
> > Working around a kernel bug. The workaround only worked on AMD
> > systems. The correct solution was to fix the kernel bug, not poke
> > MSRs.
>
> Do you remember which
On Sun, Apr 11, 2021 at 09:57:20AM -0700, Andy Lutomirski wrote:
> Working around a kernel bug. The workaround only worked on AMD
> systems. The correct solution was to fix the kernel bug, not poke
> MSRs.
Do you remember which program(s) and where I can get them to have a
look?
--
> On Apr 11, 2021, at 9:43 AM, Andi Kleen wrote:
>
>
>>
>> I have actually seen real user programs poke MSR_SYSCALL_MASK.
>
> Hmm, what was the use case?
>
>
Working around a kernel bug. The workaround only worked on AMD systems. The
correct solution was to fix the kernel bug, not
> I have actually seen real user programs poke MSR_SYSCALL_MASK.
Hmm, what was the use case?
-Andi
On Sat, Apr 10, 2021 at 11:52 AM Andi Kleen wrote:
>
> Borislav Petkov writes:
>
> > From: Borislav Petkov
> > 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
On Sat, Apr 10, 2021 at 11:52:17AM -0700, Andi Kleen wrote:
> 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.
You'd be surprised how much motivation
Borislav Petkov writes:
> From: Borislav Petkov
> 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
> On Apr 10, 2021, at 5:11 AM, Borislav Petkov wrote:
>
> From: Borislav Petkov
> 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
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