From: Sean Christopherson <seanjc@google.com>
To: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
kvm@vger.kernel.org, linux-hyperv@vger.kernel.org,
linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
Ajay Garg <ajaygargnsit@gmail.com>,
Paolo Bonzini <pbonzini@redhat.com>,
"K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
Arnd Bergmann <arnd@arndb.de>
Subject: Re: [PATCH v2 7/8] KVM: x86: Reject fixeds-size Hyper-V hypercalls with non-zero "var_cnt"
Date: Fri, 3 Dec 2021 23:48:42 +0000 [thread overview]
Message-ID: <Yaqs2uIiAoyfbdbX@google.com> (raw)
In-Reply-To: <87y268jhm1.fsf@vitty.brq.redhat.com>
On Mon, Nov 01, 2021, Vitaly Kuznetsov wrote:
> Sean Christopherson <seanjc@google.com> writes:
> > @@ -2331,6 +2331,11 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
> > ret = HV_STATUS_OPERATION_DENIED;
> > break;
> > }
> > + if (unlikely(hc.var_cnt)) {
> > + ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
> > + break;
> > + }
> > +
>
> Probably true for HVCALL_RESET_DEBUG_SESSION but I'm not sure about
> HVCALL_POST_DEBUG_DATA/HVCALL_RETRIEVE_DEBUG_DATA (note 'fallthrough'
> above) -- these are not described well in TLFS.
I'll drop the check for all the DEBUG hypercalls and add a note in the changelog
to call out that they're probably not supposed to use var_cnt, but that the TLFS
documentation isn't clear one way or the other.
next prev parent reply other threads:[~2021-12-03 23:48 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-30 0:07 [PATCH v2 0/8] KVM: x86: Hyper-V hypercall fix and cleanups Sean Christopherson
2021-10-30 0:07 ` [PATCH v2 1/8] KVM: x86: Ignore sparse banks size for an "all CPUs", non-sparse IPI req Sean Christopherson
2021-11-01 9:05 ` Vitaly Kuznetsov
2021-10-30 0:07 ` [PATCH v2 2/8] KVM: x86: Get the number of Hyper-V sparse banks from the VARHEAD field Sean Christopherson
2021-11-01 9:52 ` Vitaly Kuznetsov
2021-10-30 0:07 ` [PATCH v2 3/8] KVM: x86: Refactor kvm_hv_flush_tlb() to reduce indentation Sean Christopherson
2021-11-01 10:00 ` Vitaly Kuznetsov
2021-12-03 23:45 ` Sean Christopherson
2021-10-30 0:07 ` [PATCH v2 4/8] KVM: x86: Add a helper to get the sparse VP_SET for IPIs and TLB flushes Sean Christopherson
2021-11-01 10:06 ` Vitaly Kuznetsov
2021-10-30 0:07 ` [PATCH v2 5/8] KVM: x86: Don't bother reading sparse banks that end up being ignored Sean Christopherson
2021-11-01 9:46 ` Vitaly Kuznetsov
2021-10-30 0:07 ` [PATCH v2 6/8] KVM: x86: Shove vp_bitmap handling down into sparse_set_to_vcpu_mask() Sean Christopherson
2021-11-01 10:12 ` Vitaly Kuznetsov
2021-10-30 0:07 ` [PATCH v2 7/8] KVM: x86: Reject fixeds-size Hyper-V hypercalls with non-zero "var_cnt" Sean Christopherson
2021-11-01 10:27 ` Vitaly Kuznetsov
2021-12-03 23:48 ` Sean Christopherson [this message]
2021-10-30 0:08 ` [PATCH v2 8/8] KVM: x86: Add checks for reserved-to-zero Hyper-V hypercall fields Sean Christopherson
2021-11-01 10:33 ` Vitaly Kuznetsov
2021-12-02 2:13 ` Sean Christopherson
2021-12-02 15:16 ` Michael Kelley (LINUX)
2021-12-03 14:09 ` ** POTENTIAL FRAUD ALERT - RED HAT ** " Vitaly Kuznetsov
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