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cloud-hypervisor/vmm/src/seccomp_filters.rs
Alyssa Ross 330b5ea3be vmm: notify virtio-console of pty resizes 
When a pty is resized (using the TIOCSWINSZ ioctl -- see ioctl_tty(2)),
the kernel will send a SIGWINCH signal to the pty's foreground process
group to notify it of the resize.  This is the only way to be notified
by the kernel of a pty resize.

We can't just make the cloud-hypervisor process's process group the
foreground process group though, because a process can only set the
foreground process group of its controlling terminal, and
cloud-hypervisor's controlling terminal will often be the terminal the
user is running it in.  To work around this, we fork a subprocess in a
new process group, and set its process group to be the foreground
process group of the pty.  The subprocess additionally must be running
in a new session so that it can have a different controlling
terminal.  This subprocess writes a byte to a pipe every time the pty
is resized, and the virtio-console device can listen for this in its
epoll loop.

Alternatives I considered were to have the subprocess just send
SIGWINCH to its parent, and to use an eventfd instead of a pipe.
I decided against the signal approach because re-purposing a signal
that has a very specific meaning (even if this use was only slightly
different to its normal meaning) felt unclean, and because it would
have required using pidfds to avoid race conditions if
cloud-hypervisor had terminated, which added complexity.  I decided
against using an eventfd because using a pipe instead allows the child
to be notified (via poll(2)) when nothing is reading from the pipe any
more, meaning it can be reliably notified of parent death and
terminate itself immediately.

I used clone3(2) instead of fork(2) because without
CLONE_CLEAR_SIGHAND the subprocess would inherit signal-hook's signal
handlers, and there's no other straightforward way to restore all signal
handlers to their defaults in the child process.  The only way to do
it would be to iterate through all possible signals, or maintain a
global list of monitored signals ourselves (vmm:vm::HANDLED_SIGNALS is
insufficient because it doesn't take into account e.g. the SIGSYS
signal handler that catches seccomp violations).

Signed-off-by: Alyssa Ross <hi@alyssa.is>
2021-09-14 15:43:25 +01:00

696 lines
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// Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// Copyright © 2020 Intel Corporation
//
// SPDX-License-Identifier: Apache-2.0
use seccompiler::{
BackendError, BpfProgram, Error, SeccompAction, SeccompCmpArgLen as ArgLen, SeccompCmpOp::Eq,
SeccompCondition as Cond, SeccompFilter, SeccompRule,
};
use std::convert::TryInto;
pub enum Thread {
Api,
SignalHandler,
Vcpu,
Vmm,
PtyForeground,
}
/// Shorthand for chaining `SeccompCondition`s with the `and` operator in a `SeccompRule`.
/// The rule will take the `Allow` action if _all_ the conditions are true.
///
/// [`SeccompCondition`]: struct.SeccompCondition.html
/// [`SeccompRule`]: struct.SeccompRule.html
macro_rules! and {
($($x:expr,)*) => (SeccompRule::new(vec![$($x),*]).unwrap());
($($x:expr),*) => (SeccompRule::new(vec![$($x),*]).unwrap())
}
/// Shorthand for chaining `SeccompRule`s with the `or` operator in a `SeccompFilter`.
///
/// [`SeccompFilter`]: struct.SeccompFilter.html
/// [`SeccompRule`]: struct.SeccompRule.html
macro_rules! or {
($($x:expr,)*) => (vec![$($x),*]);
($($x:expr),*) => (vec![$($x),*])
}
// See include/uapi/asm-generic/ioctls.h in the kernel code.
const TCGETS: u64 = 0x5401;
const TCSETS: u64 = 0x5402;
const TIOCSCTTY: u64 = 0x540E;
const TIOCSPGRP: u64 = 0x5410;
const TIOCGWINSZ: u64 = 0x5413;
const TIOCSPTLCK: u64 = 0x4004_5431;
const TIOCGTPEER: u64 = 0x5441;
const FIOCLEX: u64 = 0x5451;
const FIONBIO: u64 = 0x5421;
// See include/uapi/linux/if_tun.h in the kernel code.
const TUNGETIFF: u64 = 0x8004_54d2;
const TUNSETIFF: u64 = 0x4004_54ca;
const TUNSETOFFLOAD: u64 = 0x4004_54d0;
const TUNSETVNETHDRSZ: u64 = 0x4004_54d8;
const TUNGETFEATURES: u64 = 0x8004_54cf;
// See include/uapi/linux/sockios.h in the kernel code.
const SIOCGIFFLAGS: u64 = 0x8913;
const SIOCGIFHWADDR: u64 = 0x8927;
const SIOCSIFFLAGS: u64 = 0x8914;
const SIOCSIFADDR: u64 = 0x8916;
const SIOCSIFHWADDR: u64 = 0x8924;
const SIOCSIFNETMASK: u64 = 0x891c;
// See include/uapi/linux/vfio.h in the kernel code.
const VFIO_GET_API_VERSION: u64 = 0x3b64;
const VFIO_CHECK_EXTENSION: u64 = 0x3b65;
const VFIO_SET_IOMMU: u64 = 0x3b66;
const VFIO_GROUP_GET_STATUS: u64 = 0x3b67;
const VFIO_GROUP_SET_CONTAINER: u64 = 0x3b68;
const VFIO_GROUP_UNSET_CONTAINER: u64 = 0x3b69;
const VFIO_GROUP_GET_DEVICE_FD: u64 = 0x3b6a;
const VFIO_DEVICE_GET_INFO: u64 = 0x3b6b;
const VFIO_DEVICE_GET_REGION_INFO: u64 = 0x3b6c;
const VFIO_DEVICE_GET_IRQ_INFO: u64 = 0x3b6d;
const VFIO_DEVICE_SET_IRQS: u64 = 0x3b6e;
const VFIO_DEVICE_RESET: u64 = 0x3b6f;
const VFIO_IOMMU_MAP_DMA: u64 = 0x3b71;
const VFIO_IOMMU_UNMAP_DMA: u64 = 0x3b72;
const VFIO_DEVICE_IOEVENTFD: u64 = 0x3b74;
// See include/uapi/linux/kvm.h in the kernel code.
#[cfg(feature = "kvm")]
mod kvm {
pub const KVM_GET_API_VERSION: u64 = 0xae00;
pub const KVM_CREATE_VM: u64 = 0xae01;
pub const KVM_CHECK_EXTENSION: u64 = 0xae03;
pub const KVM_GET_VCPU_MMAP_SIZE: u64 = 0xae04;
pub const KVM_CREATE_VCPU: u64 = 0xae41;
pub const KVM_CREATE_IRQCHIP: u64 = 0xae60;
pub const KVM_RUN: u64 = 0xae80;
pub const KVM_SET_MP_STATE: u64 = 0x4004_ae99;
pub const KVM_SET_GSI_ROUTING: u64 = 0x4008_ae6a;
pub const KVM_SET_DEVICE_ATTR: u64 = 0x4018_aee1;
pub const KVM_SET_ONE_REG: u64 = 0x4010_aeac;
pub const KVM_SET_USER_MEMORY_REGION: u64 = 0x4020_ae46;
pub const KVM_IRQFD: u64 = 0x4020_ae76;
pub const KVM_IOEVENTFD: u64 = 0x4040_ae79;
pub const KVM_SET_VCPU_EVENTS: u64 = 0x4040_aea0;
pub const KVM_ENABLE_CAP: u64 = 0x4068_aea3;
pub const KVM_SET_REGS: u64 = 0x4090_ae82;
pub const KVM_GET_MP_STATE: u64 = 0x8004_ae98;
pub const KVM_GET_DEVICE_ATTR: u64 = 0x4018_aee2;
pub const KVM_GET_DIRTY_LOG: u64 = 0x4010_ae42;
pub const KVM_GET_VCPU_EVENTS: u64 = 0x8040_ae9f;
pub const KVM_GET_ONE_REG: u64 = 0x4010_aeab;
pub const KVM_GET_REGS: u64 = 0x8090_ae81;
pub const KVM_GET_SUPPORTED_CPUID: u64 = 0xc008_ae05;
pub const KVM_CREATE_DEVICE: u64 = 0xc00c_aee0;
pub const KVM_GET_REG_LIST: u64 = 0xc008_aeb0;
pub const KVM_MEMORY_ENCRYPT_OP: u64 = 0xc008_aeba;
}
#[cfg(feature = "kvm")]
use kvm::*;
// MSHV IOCTL code. This is unstable until the kernel code has been declared stable.
#[cfg(feature = "mshv")]
mod mshv {
pub const MSHV_GET_API_VERSION: u64 = 0xb800;
pub const MSHV_CREATE_VM: u64 = 0x4028_b801;
pub const MSHV_MAP_GUEST_MEMORY: u64 = 0x4020_b802;
pub const MSHV_UNMAP_GUEST_MEMORY: u64 = 0x4020_b803;
pub const MSHV_CREATE_VP: u64 = 0x4004_b804;
pub const MSHV_IRQFD: u64 = 0x4010_b80e;
pub const MSHV_IOEVENTFD: u64 = 0x4020_b80f;
pub const MSHV_SET_MSI_ROUTING: u64 = 0x4008_b811;
pub const MSHV_GET_VP_REGISTERS: u64 = 0xc010_b805;
pub const MSHV_SET_VP_REGISTERS: u64 = 0x4010_b806;
pub const MSHV_RUN_VP: u64 = 0x8100_b807;
pub const MSHV_GET_VP_STATE: u64 = 0xc028_b80a;
pub const MSHV_SET_VP_STATE: u64 = 0xc028_b80b;
pub const MSHV_SET_PARTITION_PROPERTY: u64 = 0x4010_b80c;
pub const MSHV_GET_GPA_ACCESS_STATES: u64 = 0xc01c_b812;
pub const MSHV_VP_TRANSLATE_GVA: u64 = 0xc020_b80e;
}
#[cfg(feature = "mshv")]
use mshv::*;
#[cfg(feature = "mshv")]
fn create_vmm_ioctl_seccomp_rule_common_mshv() -> Result<Vec<SeccompRule>, BackendError> {
Ok(or![
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_GET_API_VERSION,)?],
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_CREATE_VM)?],
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_MAP_GUEST_MEMORY)?],
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_UNMAP_GUEST_MEMORY)?],
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_CREATE_VP)?],
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_IRQFD)?],
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_IOEVENTFD)?],
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_SET_MSI_ROUTING)?],
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_GET_VP_REGISTERS)?],
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_SET_VP_REGISTERS)?],
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_RUN_VP)?],
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_GET_VP_STATE)?],
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_SET_VP_STATE)?],
and![Cond::new(
1,
ArgLen::Dword,
Eq,
MSHV_SET_PARTITION_PROPERTY
)?],
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_GET_GPA_ACCESS_STATES)?],
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_VP_TRANSLATE_GVA)?],
])
}
#[cfg(feature = "kvm")]
fn create_vmm_ioctl_seccomp_rule_common_kvm() -> Result<Vec<SeccompRule>, BackendError> {
Ok(or![
and![Cond::new(1, ArgLen::Dword, Eq, KVM_CHECK_EXTENSION)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_CREATE_DEVICE,)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_CREATE_IRQCHIP,)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_CREATE_VCPU)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_CREATE_VM)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_ENABLE_CAP)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_GET_API_VERSION,)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_GET_DEVICE_ATTR,)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_GET_DIRTY_LOG)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_GET_MP_STATE)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_GET_ONE_REG)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_GET_REGS)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_GET_REG_LIST)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_GET_SUPPORTED_CPUID,)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_GET_VCPU_EVENTS,)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_GET_VCPU_MMAP_SIZE,)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_IOEVENTFD)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_IRQFD)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_RUN)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_MEMORY_ENCRYPT_OP)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_SET_DEVICE_ATTR,)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_SET_GSI_ROUTING)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_SET_MP_STATE)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_SET_ONE_REG)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_SET_REGS)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_SET_USER_MEMORY_REGION,)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_SET_VCPU_EVENTS,)?],
])
}
fn create_vmm_ioctl_seccomp_rule_hypervisor() -> Result<Vec<SeccompRule>, BackendError> {
#[cfg(feature = "kvm")]
let rules = create_vmm_ioctl_seccomp_rule_common_kvm();
#[cfg(feature = "mshv")]
let rules = create_vmm_ioctl_seccomp_rule_common_mshv();
rules
}
fn create_vmm_ioctl_seccomp_rule_common() -> Result<Vec<SeccompRule>, BackendError> {
let mut common_rules = or![
and![Cond::new(1, ArgLen::Dword, Eq, FIOCLEX)?],
and![Cond::new(1, ArgLen::Dword, Eq, FIONBIO)?],
and![Cond::new(1, ArgLen::Dword, Eq, SIOCGIFFLAGS)?],
and![Cond::new(1, ArgLen::Dword, Eq, SIOCGIFHWADDR)?],
and![Cond::new(1, ArgLen::Dword, Eq, SIOCSIFADDR)?],
and![Cond::new(1, ArgLen::Dword, Eq, SIOCSIFFLAGS)?],
and![Cond::new(1, ArgLen::Dword, Eq, SIOCSIFHWADDR)?],
and![Cond::new(1, ArgLen::Dword, Eq, SIOCSIFNETMASK)?],
and![Cond::new(1, ArgLen::Dword, Eq, TCSETS)?],
and![Cond::new(1, ArgLen::Dword, Eq, TCGETS)?],
and![Cond::new(1, ArgLen::Dword, Eq, TIOCGTPEER)?],
and![Cond::new(1, ArgLen::Dword, Eq, TIOCGWINSZ)?],
and![Cond::new(1, ArgLen::Dword, Eq, TIOCSCTTY)?],
and![Cond::new(1, ArgLen::Dword, Eq, TIOCSPGRP)?],
and![Cond::new(1, ArgLen::Dword, Eq, TIOCSPTLCK)?],
and![Cond::new(1, ArgLen::Dword, Eq, TUNGETFEATURES)?],
and![Cond::new(1, ArgLen::Dword, Eq, TUNGETIFF)?],
and![Cond::new(1, ArgLen::Dword, Eq, TUNSETIFF)?],
and![Cond::new(1, ArgLen::Dword, Eq, TUNSETOFFLOAD)?],
and![Cond::new(1, ArgLen::Dword, Eq, TUNSETVNETHDRSZ)?],
and![Cond::new(1, ArgLen::Dword, Eq, VFIO_GET_API_VERSION)?],
and![Cond::new(1, ArgLen::Dword, Eq, VFIO_CHECK_EXTENSION)?],
and![Cond::new(1, ArgLen::Dword, Eq, VFIO_SET_IOMMU)?],
and![Cond::new(1, ArgLen::Dword, Eq, VFIO_GROUP_GET_STATUS)?],
and![Cond::new(1, ArgLen::Dword, Eq, VFIO_GROUP_SET_CONTAINER)?],
and![Cond::new(1, ArgLen::Dword, Eq, VFIO_GROUP_UNSET_CONTAINER)?],
and![Cond::new(1, ArgLen::Dword, Eq, VFIO_GROUP_GET_DEVICE_FD)?],
and![Cond::new(1, ArgLen::Dword, Eq, VFIO_DEVICE_GET_INFO)?],
and![Cond::new(
1,
ArgLen::Dword,
Eq,
VFIO_DEVICE_GET_REGION_INFO
)?],
and![Cond::new(1, ArgLen::Dword, Eq, VFIO_DEVICE_GET_IRQ_INFO)?],
and![Cond::new(1, ArgLen::Dword, Eq, VFIO_DEVICE_SET_IRQS)?],
and![Cond::new(1, ArgLen::Dword, Eq, VFIO_DEVICE_RESET)?],
and![Cond::new(1, ArgLen::Dword, Eq, VFIO_IOMMU_MAP_DMA)?],
and![Cond::new(1, ArgLen::Dword, Eq, VFIO_IOMMU_UNMAP_DMA)?],
and![Cond::new(1, ArgLen::Dword, Eq, VFIO_DEVICE_IOEVENTFD)?],
];
let hypervisor_rules = create_vmm_ioctl_seccomp_rule_hypervisor()?;
common_rules.extend(hypervisor_rules);
Ok(common_rules)
}
#[cfg(all(target_arch = "x86_64", feature = "kvm"))]
fn create_vmm_ioctl_seccomp_rule_kvm() -> Result<Vec<SeccompRule>, BackendError> {
const KVM_CREATE_PIT2: u64 = 0x4040_ae77;
const KVM_GET_CLOCK: u64 = 0x8030_ae7c;
const KVM_GET_CPUID2: u64 = 0xc008_ae91;
const KVM_GET_FPU: u64 = 0x81a0_ae8c;
const KVM_GET_LAPIC: u64 = 0x8400_ae8e;
const KVM_GET_MSR_INDEX_LIST: u64 = 0xc004_ae02;
const KVM_GET_MSRS: u64 = 0xc008_ae88;
const KVM_GET_SREGS: u64 = 0x8138_ae83;
const KVM_GET_XCRS: u64 = 0x8188_aea6;
const KVM_GET_XSAVE: u64 = 0x9000_aea4;
const KVM_KVMCLOCK_CTRL: u64 = 0xaead;
const KVM_SET_CLOCK: u64 = 0x4030_ae7b;
const KVM_SET_CPUID2: u64 = 0x4008_ae90;
const KVM_SET_FPU: u64 = 0x41a0_ae8d;
const KVM_SET_LAPIC: u64 = 0x4400_ae8f;
const KVM_SET_MSRS: u64 = 0x4008_ae89;
const KVM_SET_SREGS: u64 = 0x4138_ae84;
const KVM_SET_TSS_ADDR: u64 = 0xae47;
const KVM_SET_XCRS: u64 = 0x4188_aea7;
const KVM_SET_XSAVE: u64 = 0x5000_aea5;
let common_rules = create_vmm_ioctl_seccomp_rule_common()?;
let mut arch_rules = or![
and![Cond::new(1, ArgLen::Dword, Eq, KVM_CREATE_PIT2)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_GET_CLOCK,)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_GET_CPUID2,)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_GET_FPU)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_GET_LAPIC)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_GET_MSR_INDEX_LIST)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_GET_MSRS)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_GET_SREGS)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_GET_XCRS,)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_GET_XSAVE,)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_KVMCLOCK_CTRL)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_SET_CLOCK)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_SET_CPUID2)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_SET_FPU)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_SET_LAPIC)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_SET_SREGS)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_SET_TSS_ADDR,)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_SET_MSRS)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_SET_XCRS,)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_SET_XSAVE,)?],
];
arch_rules.extend(common_rules);
Ok(arch_rules)
}
#[cfg(all(target_arch = "aarch64", feature = "kvm"))]
fn create_vmm_ioctl_seccomp_rule_kvm() -> Result<Vec<SeccompRule>, BackendError> {
const KVM_ARM_PREFERRED_TARGET: u64 = 0x8020_aeaf;
const KVM_ARM_VCPU_INIT: u64 = 0x4020_aeae;
let common_rules = create_vmm_ioctl_seccomp_rule_common()?;
let mut arch_rules = or![
and![Cond::new(1, ArgLen::Dword, Eq, KVM_ARM_PREFERRED_TARGET,)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_ARM_VCPU_INIT,)?],
];
arch_rules.extend(common_rules);
Ok(arch_rules)
}
#[cfg(all(target_arch = "x86_64", feature = "mshv"))]
fn create_vmm_ioctl_seccomp_rule_mshv() -> Result<Vec<SeccompRule>, BackendError> {
create_vmm_ioctl_seccomp_rule_common()
}
fn create_vmm_ioctl_seccomp_rule() -> Result<Vec<SeccompRule>, BackendError> {
#[cfg(feature = "kvm")]
let rules = create_vmm_ioctl_seccomp_rule_kvm();
#[cfg(feature = "mshv")]
let rules = create_vmm_ioctl_seccomp_rule_mshv();
rules
}
fn create_api_ioctl_seccomp_rule() -> Result<Vec<SeccompRule>, BackendError> {
Ok(or![and![Cond::new(1, ArgLen::Dword, Eq, FIONBIO)?]])
}
fn create_signal_handler_ioctl_seccomp_rule() -> Result<Vec<SeccompRule>, BackendError> {
Ok(or![
and![Cond::new(1, ArgLen::Dword, Eq, TCGETS)?],
and![Cond::new(1, ArgLen::Dword, Eq, TCSETS)?],
and![Cond::new(1, ArgLen::Dword, Eq, TIOCGWINSZ)?],
])
}
fn signal_handler_thread_rules() -> Result<Vec<(i64, Vec<SeccompRule>)>, BackendError> {
Ok(vec![
(libc::SYS_brk, vec![]),
(libc::SYS_close, vec![]),
(libc::SYS_exit, vec![]),
(libc::SYS_exit_group, vec![]),
(libc::SYS_futex, vec![]),
(libc::SYS_ioctl, create_signal_handler_ioctl_seccomp_rule()?),
(libc::SYS_madvise, vec![]),
(libc::SYS_mmap, vec![]),
(libc::SYS_munmap, vec![]),
(libc::SYS_recvfrom, vec![]),
(libc::SYS_rt_sigprocmask, vec![]),
(libc::SYS_rt_sigreturn, vec![]),
(libc::SYS_sendto, vec![]),
(libc::SYS_sigaltstack, vec![]),
(libc::SYS_write, vec![]),
])
}
fn create_pty_foreground_ioctl_seccomp_rule() -> Result<Vec<SeccompRule>, BackendError> {
Ok(or![
and![Cond::new(1, ArgLen::Dword, Eq, TIOCSCTTY)?],
and![Cond::new(1, ArgLen::Dword, Eq, TIOCSPGRP)?],
])
}
fn pty_foreground_thread_rules() -> Result<Vec<(i64, Vec<SeccompRule>)>, BackendError> {
Ok(vec![
(libc::SYS_close, vec![]),
(libc::SYS_exit_group, vec![]),
(libc::SYS_getpgid, vec![]),
#[cfg(target_arch = "x86_64")]
(libc::SYS_getpgrp, vec![]),
(libc::SYS_ioctl, create_pty_foreground_ioctl_seccomp_rule()?),
(libc::SYS_munmap, vec![]),
#[cfg(target_arch = "x86_64")]
(libc::SYS_poll, vec![]),
#[cfg(target_arch = "aarch64")]
(libc::SYS_ppoll, vec![]),
(libc::SYS_read, vec![]),
(libc::SYS_rt_sigaction, vec![]),
(libc::SYS_rt_sigreturn, vec![]),
(libc::SYS_setsid, vec![]),
(libc::SYS_sigaltstack, vec![]),
(libc::SYS_write, vec![]),
])
}
// The filter containing the white listed syscall rules required by the VMM to
// function.
fn vmm_thread_rules() -> Result<Vec<(i64, Vec<SeccompRule>)>, BackendError> {
Ok(vec![
(libc::SYS_accept4, vec![]),
#[cfg(target_arch = "x86_64")]
(libc::SYS_access, vec![]),
#[cfg(target_arch = "x86_64")]
(libc::SYS_arch_prctl, vec![]),
(libc::SYS_bind, vec![]),
(libc::SYS_brk, vec![]),
(libc::SYS_clock_gettime, vec![]),
(libc::SYS_clock_nanosleep, vec![]),
(libc::SYS_clone, vec![]),
(libc::SYS_clone3, vec![]),
(libc::SYS_close, vec![]),
(libc::SYS_connect, vec![]),
(libc::SYS_dup, vec![]),
(libc::SYS_epoll_create1, vec![]),
(libc::SYS_epoll_ctl, vec![]),
(libc::SYS_epoll_pwait, vec![]),
#[cfg(target_arch = "x86_64")]
(libc::SYS_epoll_wait, vec![]),
(libc::SYS_eventfd2, vec![]),
(libc::SYS_execve, vec![]),
(libc::SYS_exit, vec![]),
(libc::SYS_exit_group, vec![]),
(libc::SYS_fallocate, vec![]),
(libc::SYS_fcntl, vec![]),
(libc::SYS_fdatasync, vec![]),
#[cfg(target_arch = "x86_64")]
(libc::SYS_fork, vec![]),
(libc::SYS_fstat, vec![]),
(libc::SYS_fsync, vec![]),
(libc::SYS_ftruncate, vec![]),
#[cfg(target_arch = "aarch64")]
(libc::SYS_faccessat, vec![]),
#[cfg(target_arch = "aarch64")]
(libc::SYS_newfstatat, vec![]),
(libc::SYS_futex, vec![]),
(libc::SYS_getpgid, vec![]),
#[cfg(target_arch = "x86_64")]
(libc::SYS_getpgrp, vec![]),
(libc::SYS_getpid, vec![]),
(libc::SYS_getrandom, vec![]),
(libc::SYS_gettid, vec![]),
(libc::SYS_gettimeofday, vec![]),
(libc::SYS_getuid, vec![]),
(libc::SYS_ioctl, create_vmm_ioctl_seccomp_rule()?),
(libc::SYS_io_uring_enter, vec![]),
(libc::SYS_io_uring_setup, vec![]),
(libc::SYS_io_uring_register, vec![]),
(libc::SYS_kill, vec![]),
(libc::SYS_listen, vec![]),
(libc::SYS_lseek, vec![]),
(libc::SYS_madvise, vec![]),
(libc::SYS_mbind, vec![]),
(libc::SYS_memfd_create, vec![]),
(libc::SYS_mmap, vec![]),
(libc::SYS_mprotect, vec![]),
(libc::SYS_mremap, vec![]),
(libc::SYS_munmap, vec![]),
(libc::SYS_nanosleep, vec![]),
(libc::SYS_newfstatat, vec![]),
#[cfg(target_arch = "x86_64")]
(libc::SYS_open, vec![]),
(libc::SYS_openat, vec![]),
(libc::SYS_pipe2, vec![]),
#[cfg(target_arch = "x86_64")]
(libc::SYS_poll, vec![]),
#[cfg(target_arch = "aarch64")]
(libc::SYS_ppoll, vec![]),
(libc::SYS_prctl, vec![]),
(libc::SYS_pread64, vec![]),
(libc::SYS_preadv, vec![]),
(libc::SYS_prlimit64, vec![]),
(libc::SYS_pwrite64, vec![]),
(libc::SYS_pwritev, vec![]),
(libc::SYS_read, vec![]),
(libc::SYS_readv, vec![]),
#[cfg(target_arch = "x86_64")]
(libc::SYS_readlink, vec![]),
#[cfg(target_arch = "aarch64")]
(libc::SYS_readlinkat, vec![]),
(libc::SYS_recvfrom, vec![]),
(libc::SYS_recvmsg, vec![]),
(libc::SYS_restart_syscall, vec![]),
(libc::SYS_rt_sigaction, vec![]),
(libc::SYS_rt_sigprocmask, vec![]),
(libc::SYS_rt_sigreturn, vec![]),
(libc::SYS_sched_getaffinity, vec![]),
(libc::SYS_sendmsg, vec![]),
(libc::SYS_sendto, vec![]),
(libc::SYS_set_robust_list, vec![]),
(libc::SYS_set_tid_address, vec![]),
(libc::SYS_setsid, vec![]),
(libc::SYS_sigaltstack, vec![]),
(
libc::SYS_socket,
or![
and![Cond::new(0, ArgLen::Dword, Eq, libc::AF_UNIX as u64)?],
and![Cond::new(0, ArgLen::Dword, Eq, libc::AF_INET as u64)?],
],
),
(libc::SYS_socketpair, vec![]),
#[cfg(target_arch = "x86_64")]
(libc::SYS_stat, vec![]),
(libc::SYS_statx, vec![]),
(libc::SYS_tgkill, vec![]),
(libc::SYS_timerfd_create, vec![]),
(libc::SYS_timerfd_settime, vec![]),
(libc::SYS_tkill, vec![]),
(
libc::SYS_umask,
or![and![Cond::new(0, ArgLen::Dword, Eq, 0o077)?]],
),
#[cfg(target_arch = "x86_64")]
(libc::SYS_unlink, vec![]),
#[cfg(target_arch = "aarch64")]
(libc::SYS_unlinkat, vec![]),
(libc::SYS_wait4, vec![]),
(libc::SYS_write, vec![]),
(libc::SYS_writev, vec![]),
])
}
#[cfg(feature = "kvm")]
fn create_vcpu_ioctl_seccomp_rule_kvm() -> Result<Vec<SeccompRule>, BackendError> {
Ok(or![
and![Cond::new(1, ArgLen::Dword, Eq, KVM_CHECK_EXTENSION,)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_IOEVENTFD)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_IRQFD,)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_SET_DEVICE_ATTR,)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_SET_GSI_ROUTING,)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_SET_USER_MEMORY_REGION,)?],
and![Cond::new(1, ArgLen::Dword, Eq, KVM_RUN,)?],
])
}
#[cfg(feature = "mshv")]
fn create_vcpu_ioctl_seccomp_rule_mshv() -> Result<Vec<SeccompRule>, BackendError> {
Ok(or![
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_SET_MSI_ROUTING)?],
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_IOEVENTFD)?],
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_IRQFD)?],
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_RUN_VP)?],
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_GET_VP_REGISTERS)?],
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_SET_VP_REGISTERS)?],
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_MAP_GUEST_MEMORY)?],
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_UNMAP_GUEST_MEMORY)?],
and![Cond::new(1, ArgLen::Dword, Eq, MSHV_VP_TRANSLATE_GVA)?],
])
}
fn create_vcpu_ioctl_seccomp_rule_hypervisor() -> Result<Vec<SeccompRule>, BackendError> {
#[cfg(feature = "kvm")]
let rules = create_vcpu_ioctl_seccomp_rule_kvm();
#[cfg(feature = "mshv")]
let rules = create_vcpu_ioctl_seccomp_rule_mshv();
rules
}
fn create_vcpu_ioctl_seccomp_rule() -> Result<Vec<SeccompRule>, BackendError> {
let mut rules = or![
and![Cond::new(1, ArgLen::Dword, Eq, VFIO_DEVICE_SET_IRQS)?],
and![Cond::new(1, ArgLen::Dword, Eq, VFIO_GROUP_UNSET_CONTAINER)?],
and![Cond::new(1, ArgLen::Dword, Eq, VFIO_IOMMU_UNMAP_DMA)?],
];
let hypervisor_rules = create_vcpu_ioctl_seccomp_rule_hypervisor()?;
rules.extend(hypervisor_rules);
Ok(rules)
}
fn vcpu_thread_rules() -> Result<Vec<(i64, Vec<SeccompRule>)>, BackendError> {
Ok(vec![
(libc::SYS_brk, vec![]),
(libc::SYS_clock_gettime, vec![]),
(libc::SYS_clock_nanosleep, vec![]),
(libc::SYS_close, vec![]),
(libc::SYS_dup, vec![]),
(libc::SYS_exit, vec![]),
(libc::SYS_fstat, vec![]),
(libc::SYS_futex, vec![]),
(libc::SYS_getrandom, vec![]),
(libc::SYS_getpid, vec![]),
(libc::SYS_ioctl, create_vcpu_ioctl_seccomp_rule()?),
(libc::SYS_lseek, vec![]),
(libc::SYS_madvise, vec![]),
(libc::SYS_mmap, vec![]),
(libc::SYS_mprotect, vec![]),
(libc::SYS_munmap, vec![]),
(libc::SYS_nanosleep, vec![]),
(libc::SYS_newfstatat, vec![]),
#[cfg(target_arch = "x86_64")]
(libc::SYS_open, vec![]),
(libc::SYS_openat, vec![]),
(libc::SYS_pread64, vec![]),
(libc::SYS_pwrite64, vec![]),
(libc::SYS_read, vec![]),
(libc::SYS_recvfrom, vec![]),
(libc::SYS_recvmsg, vec![]),
(libc::SYS_rt_sigaction, vec![]),
(libc::SYS_rt_sigprocmask, vec![]),
(libc::SYS_rt_sigreturn, vec![]),
(libc::SYS_sendmsg, vec![]),
(libc::SYS_sigaltstack, vec![]),
(libc::SYS_tgkill, vec![]),
(libc::SYS_tkill, vec![]),
#[cfg(target_arch = "x86_64")]
(libc::SYS_unlink, vec![]),
#[cfg(target_arch = "aarch64")]
(libc::SYS_unlinkat, vec![]),
(libc::SYS_write, vec![]),
(libc::SYS_writev, vec![]),
])
}
// The filter containing the white listed syscall rules required by the API to
// function.
fn api_thread_rules() -> Result<Vec<(i64, Vec<SeccompRule>)>, BackendError> {
Ok(vec![
(libc::SYS_accept4, vec![]),
(libc::SYS_brk, vec![]),
(libc::SYS_close, vec![]),
(libc::SYS_dup, vec![]),
(libc::SYS_epoll_create1, vec![]),
(libc::SYS_epoll_ctl, vec![]),
(libc::SYS_epoll_pwait, vec![]),
#[cfg(target_arch = "x86_64")]
(libc::SYS_epoll_wait, vec![]),
(libc::SYS_exit, vec![]),
(libc::SYS_fcntl, vec![]),
(libc::SYS_futex, vec![]),
(libc::SYS_getrandom, vec![]),
(libc::SYS_ioctl, create_api_ioctl_seccomp_rule()?),
(libc::SYS_madvise, vec![]),
(libc::SYS_mmap, vec![]),
(libc::SYS_mprotect, vec![]),
(libc::SYS_munmap, vec![]),
(libc::SYS_recvfrom, vec![]),
(libc::SYS_recvmsg, vec![]),
(libc::SYS_sigaltstack, vec![]),
(libc::SYS_write, vec![]),
])
}
fn get_seccomp_rules(thread_type: Thread) -> Result<Vec<(i64, Vec<SeccompRule>)>, BackendError> {
match thread_type {
Thread::Api => Ok(api_thread_rules()?),
Thread::SignalHandler => Ok(signal_handler_thread_rules()?),
Thread::Vcpu => Ok(vcpu_thread_rules()?),
Thread::Vmm => Ok(vmm_thread_rules()?),
Thread::PtyForeground => Ok(pty_foreground_thread_rules()?),
}
}
/// Generate a BPF program based on the seccomp_action value
pub fn get_seccomp_filter(
seccomp_action: &SeccompAction,
thread_type: Thread,
) -> Result<BpfProgram, Error> {
match seccomp_action {
SeccompAction::Allow => Ok(vec![]),
SeccompAction::Log => SeccompFilter::new(
get_seccomp_rules(thread_type)
.map_err(Error::Backend)?
.into_iter()
.collect(),
SeccompAction::Log,
SeccompAction::Allow,
std::env::consts::ARCH.try_into().unwrap(),
)
.and_then(|filter| filter.try_into())
.map_err(Error::Backend),
_ => SeccompFilter::new(
get_seccomp_rules(thread_type)
.map_err(Error::Backend)?
.into_iter()
.collect(),
SeccompAction::Trap,
SeccompAction::Allow,
std::env::consts::ARCH.try_into().unwrap(),
)
.and_then(|filter| filter.try_into())
.map_err(Error::Backend),
}
}
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