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Mon, 30 Oct 2023 09:41:21 -0700 (PDT) X-Google-Smtp-Source: AGHT+IHTiSuFvoaldVvmzpOuJ7hrxnp8F0haU3J0TRB7XQQLTMncSBFWLoJ8VZmLvYEh0j61qNpd9w== X-Received: by 2002:a05:600c:3544:b0:407:4944:76d1 with SMTP id i4-20020a05600c354400b00407494476d1mr8469559wmq.17.1698684081249; Mon, 30 Oct 2023 09:41:21 -0700 (PDT) Received: from [192.168.1.174] ([151.81.68.207]) by smtp.googlemail.com with ESMTPSA id h9-20020a05600c314900b0040849ce7116sm13117155wmo.43.2023.10.30.09.41.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Oct 2023 09:41:20 -0700 (PDT) Message-ID: <211d093f-4023-4a39-a23f-6d8543512675@redhat.com> Date: Mon, 30 Oct 2023 17:41:06 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v13 08/35] KVM: Introduce KVM_SET_USER_MEMORY_REGION2 To: Sean Christopherson , Marc Zyngier , Oliver Upton , Huacai Chen , Michael Ellerman , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexander Viro , Christian Brauner , "Matthew Wilcox (Oracle)" , Andrew Morton References: <20231027182217.3615211-1-seanjc@google.com> <20231027182217.3615211-9-seanjc@google.com> From: Paolo Bonzini Autocrypt: addr=pbonzini@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kvm@vger.kernel.org, David Hildenbrand , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Chao Peng , linux-riscv@lists.infradead.org, Isaku Yamahata , Xiaoyao Li , Wang , Fuad Tabba , linux-arm-kernel@lists.infradead.org, Maciej Szmigiero , Michael Roth , Ackerley Tng , David Matlack , Vlastimil Babka , =?UTF-8?B?TWlja2HDq2wgU2FsYcO8?= =?UTF-8?Q?n?= , Isaku Yamahata , Quentin Perret , kvmarm@lists.linux.dev, linux-mips@vger.kernel.org, Jarkko Sakkinen , Yu Zhang , "Kirill A . Shutemov" , kvm-riscv@lists.infradead.org, linux-fsdevel@vger.kernel.org, Liam Merwick , Vishal A nnapurve , linuxppc-dev@lists.ozlabs.org, Xu Yilun , Anish Moorthy Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 10/27/23 20:21, Sean Christopherson wrote: > > + if (ioctl == KVM_SET_USER_MEMORY_REGION) > + size = sizeof(struct kvm_userspace_memory_region); This also needs a memset(&mem, 0, sizeof(mem)), otherwise the out-of-bounds access of the commit message becomes a kernel stack read. Probably worth adding a check on valid flags here. Paolo > + else > + size = sizeof(struct kvm_userspace_memory_region2); > + > + /* Ensure the common parts of the two structs are identical. */ > + SANITY_CHECK_MEM_REGION_FIELD(slot); > + SANITY_CHECK_MEM_REGION_FIELD(flags); > + SANITY_CHECK_MEM_REGION_FIELD(guest_phys_addr); > + SANITY_CHECK_MEM_REGION_FIELD(memory_size); > + SANITY_CHECK_MEM_REGION_FIELD(userspace_addr); >