From: Borislav Petkov <bp@alien8.de>
To: "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
kitsunyan <kitsunyan@airmail.cc>,
"Brown, Len" <len.brown@intel.com>, X86 ML <x86@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Sultan Alsawaf <sultan@kerneltoast.com>
Subject: Re: [PATCH] x86/msr: do not warn on writes to OC_MAILBOX
Date: Tue, 8 Sep 2020 20:01:12 +0200 [thread overview]
Message-ID: <20200908180112.GK25236@zn.tnic> (raw)
In-Reply-To: <CAHmME9pVO01mj8vgKPEX7a6pZDRSfX62e2Ow8R=L79hLSJoaMA@mail.gmail.com>
On Tue, Sep 08, 2020 at 07:42:12PM +0200, Jason A. Donenfeld wrote:
> Are you prepared to track down all the MSRs that might maybe do
> something naughty?
I'm not prepared - that's why this MSR filtering. To block *all* direct
MSR accesses from userspace in the future.
> Does `dd` warn when you run `dd if=/dev/zero of=/dev/sda`?
Yah, because that's the same as bricking your hardware. Geez.
> Probably not possible. Optimal values are related to the "silicon
> lottery" that occurs when you buy a new CPU. Different optimal values
> for different individual chips.
Let's wait for what Srinivas finds out. I'd let Intel decide what they
wanna do.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2020-09-08 18:02 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-07 9:48 [PATCH] x86/msr: do not warn on writes to OC_MAILBOX Jason A. Donenfeld
2020-09-07 10:06 ` Borislav Petkov
2020-09-07 10:46 ` Jason A. Donenfeld
2020-09-07 11:11 ` Borislav Petkov
2020-09-07 11:15 ` Jason A. Donenfeld
2020-09-07 11:23 ` Borislav Petkov
2020-09-08 17:10 ` Srinivas Pandruvada
2020-09-08 17:12 ` Jason A. Donenfeld
2020-09-08 17:25 ` Borislav Petkov
2020-09-08 17:29 ` Jason A. Donenfeld
2020-09-08 17:36 ` Borislav Petkov
2020-09-08 17:42 ` Jason A. Donenfeld
2020-09-08 18:01 ` Borislav Petkov [this message]
2020-09-08 19:07 ` Jason A. Donenfeld
2020-09-08 19:18 ` Sultan Alsawaf
2020-09-08 19:30 ` Borislav Petkov
2020-09-08 20:35 ` Andy Lutomirski
2020-09-08 22:32 ` Matthew Garrett
2020-09-09 23:56 ` Andy Lutomirski
2020-09-09 1:02 ` Srinivas Pandruvada
2020-09-10 0:08 ` Andy Lutomirski
2020-10-19 17:15 ` Borislav Petkov
2020-10-20 17:21 ` Srinivas Pandruvada
2020-10-20 17:47 ` Borislav Petkov
2020-10-20 18:40 ` Srinivas Pandruvada
2020-10-20 19:40 ` Dave Hansen
2020-10-21 13:11 ` Srinivas Pandruvada
2020-10-22 19:28 ` Borislav Petkov
2020-10-21 13:24 ` Peter Zijlstra
2020-09-08 17:31 ` Borislav Petkov
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