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vmm: Create new seccomp_filter module
Based on the seccomp crate, we create a new vmm module responsible for creating a seccomp filter that will be applied to the VMM main thread. Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf
parent
708f02dc26
commit
cb98d90097
245
vmm/src/seccomp_filters.rs
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245
vmm/src/seccomp_filters.rs
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// Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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//
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// Copyright © 2020 Intel Corporation
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//
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// SPDX-License-Identifier: Apache-2.0
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use libc;
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use seccomp::{
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allow_syscall, allow_syscall_if, BpfProgram, Error, SeccompAction, SeccompCmpArgLen as ArgLen,
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SeccompCmpOp::Eq, SeccompCondition as Cond, SeccompError, SeccompFilter, SeccompLevel,
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SeccompRule,
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};
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use std::convert::TryInto;
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/// Shorthand for chaining `SeccompCondition`s with the `and` operator in a `SeccompRule`.
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/// The rule will take the `Allow` action if _all_ the conditions are true.
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///
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/// [`Allow`]: enum.SeccompAction.html
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/// [`SeccompCondition`]: struct.SeccompCondition.html
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/// [`SeccompRule`]: struct.SeccompRule.html
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macro_rules! and {
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($($x:expr,)*) => (SeccompRule::new(vec![$($x),*], SeccompAction::Allow));
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($($x:expr),*) => (SeccompRule::new(vec![$($x),*], SeccompAction::Allow))
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}
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/// Shorthand for chaining `SeccompRule`s with the `or` operator in a `SeccompFilter`.
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///
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/// [`SeccompFilter`]: struct.SeccompFilter.html
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/// [`SeccompRule`]: struct.SeccompRule.html
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macro_rules! or {
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($($x:expr,)*) => (vec![$($x),*]);
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($($x:expr),*) => (vec![$($x),*])
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}
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// See include/uapi/asm-generic/ioctls.h in the kernel code.
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const TCGETS: u64 = 0x5401;
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const TCSETS: u64 = 0x5402;
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const TIOCGWINSZ: u64 = 0x5413;
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const FIOCLEX: u64 = 0x5451;
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const FIONBIO: u64 = 0x5421;
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// See include/uapi/linux/kvm.h in the kernel code.
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const KVM_GET_API_VERSION: u64 = 0xae00;
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const KVM_CREATE_VM: u64 = 0xae01;
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const KVM_CHECK_EXTENSION: u64 = 0xae03;
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const KVM_GET_VCPU_MMAP_SIZE: u64 = 0xae04;
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const KVM_CREATE_VCPU: u64 = 0xae41;
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const KVM_SET_TSS_ADDR: u64 = 0xae47;
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const KVM_CREATE_IRQCHIP: u64 = 0xae60;
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const KVM_RUN: u64 = 0xae80;
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const KVM_SET_GSI_ROUTING: u64 = 0x4008_ae6a;
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const KVM_SET_MSRS: u64 = 0x4008_ae89;
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const KVM_SET_CPUID2: u64 = 0x4008_ae90;
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const KVM_SET_DEVICE_ATTR: u64 = 0x4018_aee1;
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const KVM_SET_USER_MEMORY_REGION: u64 = 0x4020_ae46;
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const KVM_IRQFD: u64 = 0x4020_ae76;
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const KVM_CREATE_PIT2: u64 = 0x4040_ae77;
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const KVM_IOEVENTFD: u64 = 0x4040_ae79;
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const KVM_ENABLE_CAP: u64 = 0x4068_aea3;
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const KVM_SET_REGS: u64 = 0x4090_ae82;
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const KVM_SET_SREGS: u64 = 0x4138_ae84;
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const KVM_SET_FPU: u64 = 0x41a0_ae8d;
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const KVM_SET_LAPIC: u64 = 0x4400_ae8f;
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const KVM_GET_SREGS: u64 = 0x8138_ae83;
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const KVM_GET_LAPIC: u64 = 0x8400_ae8e;
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const KVM_GET_SUPPORTED_CPUID: u64 = 0xc008_ae05;
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const KVM_CREATE_DEVICE: u64 = 0xc00c_aee0;
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// See include/uapi/linux/if_tun.h in the kernel code.
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const TUNSETIFF: u64 = 0x4004_54ca;
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const TUNSETOFFLOAD: u64 = 0x4004_54d0;
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const TUNSETVNETHDRSZ: u64 = 0x4004_54d8;
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const TUNGETFEATURES: u64 = 0x8004_54cf;
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// See include/uapi/linux/sockios.h in the kernel code.
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const SIOCSIFFLAGS: u64 = 0x8914;
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const SIOCSIFADDR: u64 = 0x8916;
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const SIOCSIFNETMASK: u64 = 0x891c;
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// See include/uapi/linux/vfio.h in the kernel code.
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const VFIO_GET_API_VERSION: u64 = 0x3b64;
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const VFIO_CHECK_EXTENSION: u64 = 0x3b65;
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const VFIO_SET_IOMMU: u64 = 0x3b66;
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const VFIO_GROUP_GET_STATUS: u64 = 0x3b67;
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const VFIO_GROUP_SET_CONTAINER: u64 = 0x3b68;
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const VFIO_GROUP_UNSET_CONTAINER: u64 = 0x3b69;
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const VFIO_GROUP_GET_DEVICE_FD: u64 = 0x3b6a;
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const VFIO_DEVICE_GET_INFO: u64 = 0x3b6b;
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const VFIO_DEVICE_GET_REGION_INFO: u64 = 0x3b6c;
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const VFIO_DEVICE_GET_IRQ_INFO: u64 = 0x3b6d;
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const VFIO_DEVICE_SET_IRQS: u64 = 0x3b6e;
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const VFIO_DEVICE_RESET: u64 = 0x3b6f;
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const VFIO_IOMMU_MAP_DMA: u64 = 0x3b71;
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const VFIO_IOMMU_UNMAP_DMA: u64 = 0x3b72;
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const VFIO_DEVICE_IOEVENTFD: u64 = 0x3b74;
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fn create_ioctl_seccomp_rule() -> Result<Vec<SeccompRule>, Error> {
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Ok(or![
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and![Cond::new(1, ArgLen::DWORD, Eq, FIOCLEX)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, FIONBIO)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_CHECK_EXTENSION,)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_CREATE_DEVICE,)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_CREATE_IRQCHIP,)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_CREATE_PIT2)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_CREATE_VCPU)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_CREATE_VM)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_ENABLE_CAP)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_GET_API_VERSION,)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_GET_LAPIC)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_GET_SREGS)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_GET_SUPPORTED_CPUID,)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_GET_VCPU_MMAP_SIZE,)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_IOEVENTFD)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_IRQFD)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_RUN)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_SET_CPUID2)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_SET_DEVICE_ATTR,)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_SET_FPU)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_SET_GSI_ROUTING)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_SET_LAPIC)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_SET_MSRS)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_SET_REGS)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_SET_SREGS)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_SET_TSS_ADDR,)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, KVM_SET_USER_MEMORY_REGION,)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, SIOCSIFADDR)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, SIOCSIFFLAGS)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, SIOCSIFNETMASK)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, TCSETS)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, TCGETS)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, TIOCGWINSZ)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, TUNGETFEATURES)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, TUNSETIFF)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, TUNSETOFFLOAD)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, TUNSETVNETHDRSZ)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, VFIO_GET_API_VERSION)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, VFIO_CHECK_EXTENSION)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, VFIO_SET_IOMMU)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, VFIO_GROUP_GET_STATUS)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, VFIO_GROUP_SET_CONTAINER)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, VFIO_GROUP_UNSET_CONTAINER)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, VFIO_GROUP_GET_DEVICE_FD)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, VFIO_DEVICE_GET_INFO)?],
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and![Cond::new(
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1,
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ArgLen::DWORD,
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Eq,
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VFIO_DEVICE_GET_REGION_INFO
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)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, VFIO_DEVICE_GET_IRQ_INFO)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, VFIO_DEVICE_SET_IRQS)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, VFIO_DEVICE_RESET)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, VFIO_IOMMU_MAP_DMA)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, VFIO_IOMMU_UNMAP_DMA)?],
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and![Cond::new(1, ArgLen::DWORD, Eq, VFIO_DEVICE_IOEVENTFD)?],
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])
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}
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/// The default filter containing the white listed syscall rules required by
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/// the VMM to function.
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pub fn default_filter() -> Result<SeccompFilter, Error> {
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Ok(SeccompFilter::new(
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vec![
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allow_syscall(libc::SYS_accept4),
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allow_syscall(libc::SYS_access),
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allow_syscall(libc::SYS_arch_prctl),
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allow_syscall(libc::SYS_bind),
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allow_syscall(libc::SYS_brk),
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allow_syscall(libc::SYS_clone),
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allow_syscall(libc::SYS_close),
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allow_syscall(libc::SYS_connect),
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allow_syscall(libc::SYS_dup),
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allow_syscall(libc::SYS_epoll_create1),
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allow_syscall(libc::SYS_epoll_ctl),
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allow_syscall(libc::SYS_epoll_wait),
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allow_syscall(libc::SYS_eventfd2),
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allow_syscall(libc::SYS_execve),
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allow_syscall(libc::SYS_exit),
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allow_syscall(libc::SYS_exit_group),
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allow_syscall(libc::SYS_fallocate),
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allow_syscall(libc::SYS_fcntl),
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allow_syscall(libc::SYS_fdatasync),
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allow_syscall(libc::SYS_fstat),
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allow_syscall(libc::SYS_fsync),
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allow_syscall(libc::SYS_ftruncate),
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allow_syscall(libc::SYS_futex),
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allow_syscall(libc::SYS_getpid),
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allow_syscall(libc::SYS_getrandom),
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allow_syscall(libc::SYS_getuid),
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allow_syscall_if(libc::SYS_ioctl, create_ioctl_seccomp_rule()?),
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allow_syscall(libc::SYS_listen),
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allow_syscall(libc::SYS_lseek),
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allow_syscall(libc::SYS_madvise),
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allow_syscall(libc::SYS_mmap),
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allow_syscall(libc::SYS_mprotect),
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allow_syscall(libc::SYS_munmap),
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allow_syscall(libc::SYS_nanosleep),
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allow_syscall(libc::SYS_openat),
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allow_syscall(libc::SYS_prctl),
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allow_syscall(libc::SYS_pread64),
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allow_syscall(libc::SYS_prlimit64),
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allow_syscall(libc::SYS_pwrite64),
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allow_syscall(libc::SYS_read),
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allow_syscall(libc::SYS_readlink),
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allow_syscall(libc::SYS_recvfrom),
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allow_syscall(libc::SYS_recvmsg),
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allow_syscall(libc::SYS_restart_syscall),
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allow_syscall(libc::SYS_rt_sigaction),
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allow_syscall(libc::SYS_rt_sigprocmask),
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allow_syscall(libc::SYS_rt_sigreturn),
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allow_syscall(libc::SYS_sched_getaffinity),
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allow_syscall(libc::SYS_sendmsg),
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allow_syscall(libc::SYS_set_robust_list),
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allow_syscall(libc::SYS_set_tid_address),
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allow_syscall(libc::SYS_sigaltstack),
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allow_syscall_if(
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libc::SYS_socket,
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or![
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and![Cond::new(0, ArgLen::DWORD, Eq, libc::AF_UNIX as u64)?],
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and![Cond::new(0, ArgLen::DWORD, Eq, libc::AF_INET as u64)?],
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],
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),
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allow_syscall(libc::SYS_socketpair),
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allow_syscall(libc::SYS_stat),
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allow_syscall(libc::SYS_statx),
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allow_syscall(libc::SYS_tgkill),
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allow_syscall(libc::SYS_unlink),
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allow_syscall(libc::SYS_wait4),
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allow_syscall(libc::SYS_write),
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]
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.into_iter()
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.collect(),
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SeccompAction::Trap,
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)?)
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}
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/// Generate a BPF program based on a seccomp level value.
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pub fn get_seccomp_filter(seccomp_level: &SeccompLevel) -> Result<BpfProgram, SeccompError> {
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match *seccomp_level {
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SeccompLevel::None => Ok(vec![]),
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_ => default_filter()
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.and_then(|filter| filter.try_into())
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.map_err(SeccompError::SeccompFilter),
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}
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}
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