linux-kernel - [PATCH v3 3/9] KVM: x86: mmu: Add guest physical address check in translate

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200710154811.418214-4-mgamal@redhat.com>
Date:   Fri, 10 Jul 2020 17:48:05 +0200
From:   Mohammed Gamal <mgamal@...hat.com>
To:     kvm@...r.kernel.org, pbonzini@...hat.com
Cc:     linux-kernel@...r.kernel.org, vkuznets@...hat.com,
        sean.j.christopherson@...el.com, wanpengli@...cent.com,
        jmattson@...gle.com, joro@...tes.org,
        Mohammed Gamal <mgamal@...hat.com>
Subject: [PATCH v3 3/9] KVM: x86: mmu: Add guest physical address check in translate_gpa()

In case of running a guest with 4-level page tables on a 5-level page
table host, it might happen that a guest might have a physical address
with reserved bits set, but the host won't see that and trap it.

Hence, we need to check page faults' physical addresses against the guest's
maximum physical memory and if it's exceeded, we need to add
the PFERR_RSVD_MASK bits to the PF's error code.

Also make sure the error code isn't overwritten by the page table walker.

Signed-off-by: Mohammed Gamal <mgamal@...hat.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/mmu/mmu.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index f8b3c5181466..e03e85b21cda 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -518,6 +518,12 @@ static bool check_mmio_spte(struct kvm_vcpu *vcpu, u64 spte)
 static gpa_t translate_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access,
                                   struct x86_exception *exception)
 {
+	/* Check if guest physical address doesn't exceed guest maximum */
+	if (kvm_mmu_is_illegal_gpa(vcpu, gpa)) {
+		exception->error_code |= PFERR_RSVD_MASK;
+		return UNMAPPED_GVA;
+	}
+
         return gpa;
 }
 
-- 
2.26.2