From: Sean Christopherson <seanjc@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
syzbot+200c08e88ae818f849ce@syzkaller.appspotmail.com
Subject: [PATCH 0/3] KVM: x86: guest.MAXPHYADDR fix and related cleanup
Date: Tue, 31 Aug 2021 09:42:21 -0700 [thread overview]
Message-ID: <20210831164224.1119728-1-seanjc@google.com> (raw)
Fix a bug exposed by syzkaller where running with guest.MAXPHYADDR < 32
leads KVM injecting a garbage exception due to mishandling an illegal GPA
check when "translating" a non-nested GPA.
Clean up tangentially related code in load_pdptrs() to discourage reading
guest memory using a potentially-nested GPA.
Sean Christopherson (3):
Revert "KVM: x86: mmu: Add guest physical address check in
translate_gpa()"
KVM: x86: Subsume nested GPA read helper into load_pdptrs()
KVM: x86: Simplify retrieving the page offset when loading PDTPRs
arch/x86/include/asm/kvm_host.h | 3 --
arch/x86/kvm/mmu/mmu.c | 6 ----
arch/x86/kvm/x86.c | 56 +++++++++++----------------------
3 files changed, 18 insertions(+), 47 deletions(-)
--
2.33.0.259.gc128427fd7-goog
next reply other threads:[~2021-08-31 16:42 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-31 16:42 Sean Christopherson [this message]
2021-08-31 16:42 ` [PATCH 1/3] Revert "KVM: x86: mmu: Add guest physical address check in translate_gpa()" Sean Christopherson
2021-09-01 8:27 ` Vitaly Kuznetsov
2021-09-01 16:09 ` Sean Christopherson
2021-09-06 10:18 ` Paolo Bonzini
2021-08-31 16:42 ` [PATCH 2/3] KVM: x86: Subsume nested GPA read helper into load_pdptrs() Sean Christopherson
2021-08-31 16:42 ` [PATCH 3/3] KVM: x86: Simplify retrieving the page offset when loading PDTPRs Sean Christopherson
2021-09-23 16:22 ` [PATCH 0/3] KVM: x86: guest.MAXPHYADDR fix and related cleanup Paolo Bonzini
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