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([2a01:e0a:59e:9d80:527b:9dff:feef:3874]) by smtp.gmail.com with ESMTPSA id f63sm1734004wma.24.2021.09.29.09.24.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 29 Sep 2021 09:24:30 -0700 (PDT) Reply-To: eric.auger@redhat.com Subject: Re: [PATCH v3 04/10] KVM: arm64: vgic-v3: Check ITS region is not above the VM IPA size To: Ricardo Koller , kvm@vger.kernel.org, maz@kernel.org, kvmarm@lists.cs.columbia.edu, drjones@redhat.com, alexandru.elisei@arm.com Cc: Paolo Bonzini , oupton@google.com, james.morse@arm.com, suzuki.poulose@arm.com, shuah@kernel.org, jingzhangos@google.com, pshier@google.com, rananta@google.com, reijiw@google.com References: <20210928184803.2496885-1-ricarkol@google.com> <20210928184803.2496885-5-ricarkol@google.com> From: Eric Auger Message-ID: Date: Wed, 29 Sep 2021 18:24:28 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: <20210928184803.2496885-5-ricarkol@google.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 9/28/21 8:47 PM, Ricardo Koller wrote: > Verify that the ITS region does not extend beyond the VM-specified IPA > range (phys_size). > > base + size > phys_size AND base < phys_size > > Add the missing check into vgic_its_set_attr() which is called when > setting the region. > > Signed-off-by: Ricardo Koller > --- > arch/arm64/kvm/vgic/vgic-its.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/arch/arm64/kvm/vgic/vgic-its.c b/arch/arm64/kvm/vgic/vgic-its.c > index 61728c543eb9..321743b87002 100644 > --- a/arch/arm64/kvm/vgic/vgic-its.c > +++ b/arch/arm64/kvm/vgic/vgic-its.c > @@ -2710,8 +2710,8 @@ static int vgic_its_set_attr(struct kvm_device *dev, > if (copy_from_user(&addr, uaddr, sizeof(addr))) > return -EFAULT; > > - ret = vgic_check_ioaddr(dev->kvm, &its->vgic_its_base, > - addr, SZ_64K); > + ret = vgic_check_iorange(dev->kvm, &its->vgic_its_base, > + addr, SZ_64K, KVM_VGIC_V3_ITS_SIZE); > if (ret) > return ret; > Reviewed-by: Eric Auger Eric