From: Gyan Gupta <gyan.gupta@intel.com>
To: gyan.gupta@intel.com, x86-ml <x86@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>,
Linus Torvalds <torvalds@linux-foundation.org>,
lkml <linux-kernel@vger.kernel.org>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Tony Luck <tony.luck@intel.com>
Subject: [PATCH -v2] x86/msr: Filter MSR writes
Date: Mon, 22 Jun 2020 19:52:28 +0530 [thread overview]
Message-ID: <1592835748-4589-1-git-send-email-gyan.gupta@intel.com> (raw)
From: Borislav Petkov <bp@alien8.de>
> The whitelist is still TBD, I might be able to remove it competely and defer the
> whole whitelisting to the future. when people start reporting MSRs (see
> pr_err_ratelimited() call below).
I am also working on a similar functionality where we allow specific MSRs(whitelisted MSRs) to be allowed to read & write.
Additionally, writes are subjected to checks where only certain bits can be allowed to be modified. This is to increase security & safety of system.
For example, MCi_CTL can be used to enable/disable error reporting of hw unit. So in our use case once error reporting is enabled, it must
not be disabled. Also we want to have restrictions on rdmsr for security purposes.
- Gyan
next reply other threads:[~2020-06-22 14:21 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-22 14:22 Gyan Gupta [this message]
2020-06-22 15:19 ` [PATCH -v2] x86/msr: Filter MSR writes Borislav Petkov
-- strict thread matches above, loose matches on Subject: below --
2020-06-12 10:50 [RFC PATCH] " Borislav Petkov
2020-06-13 15:48 ` [PATCH -v2] " Borislav Petkov
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