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([2001:b07:6468:f312:b509:fc01:ee8a:ca8a]) by smtp.gmail.com with ESMTPSA id t8sm53079354wrp.69.2020.01.21.08.14.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 21 Jan 2020 08:14:03 -0800 (PST) Subject: Re: [PATCH v3 09/21] KVM: X86: Don't track dirty for KVM_SET_[TSS_ADDR|IDENTITY_MAP_ADDR] To: Sean Christopherson , Peter Xu Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Christophe de Dinechin , "Michael S . Tsirkin" , Yan Zhao , Alex Williamson , Jason Wang , Kevin Kevin , Vitaly Kuznetsov , "Dr . David Alan Gilbert" References: <20200109145729.32898-1-peterx@redhat.com> <20200109145729.32898-10-peterx@redhat.com> <20200121155657.GA7923@linux.intel.com> From: Paolo Bonzini Message-ID: Date: Tue, 21 Jan 2020 17:14:02 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <20200121155657.GA7923@linux.intel.com> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 21/01/20 16:56, Sean Christopherson wrote: > This code also needs to be tested by doing unrestricted_guest=0 when > loading kvm_intel, because it's obviously broken. ... as I had just found out after starting tests on kvm/queue. Unqueued this patch. Paolo > __x86_set_memory_region() > takes an "unsigned long *", interpreted as a "pointer to a usersepace > address", i.e. a "void __user **". But the callers are treating the param > as a "unsigned long in userpace", e.g. init_rmode_identity_map() declares > uaddr as an "unsigned long *", when really it should be declaring a > straight "unsigned long" and passing "&uaddr". The only thing that saves > KVM from dereferencing a bad pointer in __x86_set_memory_region() is that > uaddr is initialized to NULL