linux-kernel - [PATCH 0/2] a couple of userspace MSR filtering improvements

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Date:   Mon, 17 Aug 2020 16:24:18 +0100
From:   Chris Down <chris@...isdown.name>
To:     linux-kernel@...r.kernel.org
Cc:     Borislav Petkov <bp@...e.de>, Jakub Kicinski <kuba@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>, kernel-team@...com,
        sean.j.christopherson@...el.com, tony.luck@...el.com,
        torvalds@...ux-foundation.org, x86@...nel.org
Subject: [PATCH 0/2] a couple of userspace MSR filtering improvements

As discussed in Message-ID <20200714165621.GA3622@...gul.tnic>.

We all agree that userspace MSR twiddling is non-ideal, but we should be
a bit cautious of taking up too much kmsg buffer if applications do
repeated writes. `allow_writes=1` is possible, but is non-ideal (see
patch 1 changelog).

Also added pid information to the message, since it makes identification
of the source (more or less) unambiguous.

Chris Down (2):
  x86: Prevent userspace MSR access from dominating the console
  x86: Make source of unrecognised MSR writes unambiguous

 arch/x86/kernel/msr.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

-- 
2.28.0