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Szmigiero" Subject: Re: [PATCH v5.5 02/30] KVM: Disallow user memslot with size that exceeds "unsigned long" To: Sean Christopherson References: <20211104002531.1176691-1-seanjc@google.com> <20211104002531.1176691-3-seanjc@google.com> Message-ID: <2f451590-bf89-d447-d92a-fe9f3f41ca74@oracle.com> Date: Tue, 9 Nov 2021 01:38:02 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 In-Reply-To: <20211104002531.1176691-3-seanjc@google.com> Content-Language: en-US X-ClientProxiedBy: AS9PR06CA0298.eurprd06.prod.outlook.com (2603:10a6:20b:45a::6) To CH2PR10MB4008.namprd10.prod.outlook.com (2603:10b6:610:c::22) MIME-Version: 1.0 Received: from [172.20.10.2] (37.248.218.22) by AS9PR06CA0298.eurprd06.prod.outlook.com (2603:10a6:20b:45a::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4669.10 via Frontend Transport; Tue, 9 Nov 2021 00:38:07 +0000 X-MS-PublicTrafficType: Email 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kvm-riscv@lists.infradead.org, Paolo Bonzini , Vitaly Kuznetsov X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu On 04.11.2021 01:25, Sean Christopherson wrote: > Reject userspace memslots whose size exceeds the storage capacity of an > "unsigned long". KVM's uAPI takes the size as u64 to support large slots > on 64-bit hosts, but does not account for the size being truncated on > 32-bit hosts in various flows. The access_ok() check on the userspace > virtual address in particular casts the size to "unsigned long" and will > check the wrong number of bytes. > > KVM doesn't actually support slots whose size doesn't fit in an "unsigned > long", e.g. KVM's internal kvm_memory_slot.npages is an "unsigned long", > not a "u64", and misc arch specific code follows that behavior. > > Fixes: fa3d315a4ce2 ("KVM: Validate userspace_addr of memslot when registered") > Cc: stable@vger.kernel.org > Signed-off-by: Sean Christopherson > --- > virt/kvm/kvm_main.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c > index 99e69375c4c9..83287730389f 100644 > --- a/virt/kvm/kvm_main.c > +++ b/virt/kvm/kvm_main.c > @@ -1689,7 +1689,8 @@ int __kvm_set_memory_region(struct kvm *kvm, > id = (u16)mem->slot; > > /* General sanity checks */ > - if (mem->memory_size & (PAGE_SIZE - 1)) > + if ((mem->memory_size & (PAGE_SIZE - 1)) || > + (mem->memory_size != (unsigned long)mem->memory_size)) > return -EINVAL; > if (mem->guest_phys_addr & (PAGE_SIZE - 1)) > return -EINVAL; > Reviewed-by: Maciej S. Szmigiero _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm