linux-kernel - [PATCH 0/3] KVM: Fix for a mostly benign gpc WARN

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Date: Tue, 19 Mar 2024 17:15:39 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Sean Christopherson <seanjc@...gle.com>, syzbot+106a4f72b0474e1d1b33@...kaller.appspotmail.com, 
	David Woodhouse <dwmw2@...radead.org>, Paul Durrant <paul@....org>
Subject: [PATCH 0/3] KVM: Fix for a mostly benign gpc WARN

Fix a bug found by syzkaller, thanks to a new WARN sanity check, where KVM
marks a gfn_to_pfn_cache as active without actually setting gpc->gpa or any
other metadata.  On top, harden against _directly_ setting gpc->gpa to KVM's
magic INVALID_GPA, which would also fail the sanity check.

Sean Christopherson (3):
  KVM: Add helpers to consolidate gfn_to_pfn_cache's page split check
  KVM: Check validity of offset+length of gfn_to_pfn_cache prior to
    activation
  KVM: Explicitly disallow activatating a gfn_to_pfn_cache with
    INVALID_GPA

Sean Christopherson (3):
  KVM: Add helpers to consolidate gfn_to_pfn_cache's page split check
  KVM: Check validity of offset+length of gfn_to_pfn_cache prior to
    activation
  KVM: Explicitly disallow activatating a gfn_to_pfn_cache with
    INVALID_GPA

 virt/kvm/pfncache.c | 48 ++++++++++++++++++++++++++++++++-------------
 1 file changed, 34 insertions(+), 14 deletions(-)


base-commit: 964d0c614c7f71917305a5afdca9178fe8231434
-- 
2.44.0.291.gc1ea87d7ee-goog