2020-08-04 02:45:53 +00:00
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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 seccomp::{
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allow_syscall, BpfProgram, Error, SeccompAction, SeccompError, SeccompFilter, SyscallRuleSet,
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};
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use std::convert::TryInto;
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pub enum Thread {
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VirtioBlk,
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VirtioConsole,
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2020-08-14 21:37:01 +00:00
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VirtioIommu,
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VirtioNet,
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2020-08-14 21:49:30 +00:00
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VirtioNetCtl,
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2020-08-04 19:25:06 +00:00
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VirtioPmem,
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VirtioRng,
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}
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// The filter containing the allowed syscall rules required by the
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// virtio_blk thread to function.
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fn virtio_blk_thread_rules() -> Result<Vec<SyscallRuleSet>, Error> {
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Ok(vec![
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allow_syscall(libc::SYS_brk),
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allow_syscall(libc::SYS_close),
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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_pwait),
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#[cfg(target_arch = "x86_64")]
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allow_syscall(libc::SYS_epoll_wait),
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allow_syscall(libc::SYS_exit),
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allow_syscall(libc::SYS_fallocate),
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allow_syscall(libc::SYS_fdatasync),
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allow_syscall(libc::SYS_fsync),
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#[cfg(target_arch = "x86_64")]
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allow_syscall(libc::SYS_ftruncate),
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#[cfg(target_arch = "aarch64")]
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// The definition of libc::SYS_ftruncate is missing on AArch64.
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// Use a hard-code number instead.
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allow_syscall(46),
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allow_syscall(libc::SYS_futex),
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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_openat),
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allow_syscall(libc::SYS_prctl),
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allow_syscall(libc::SYS_read),
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allow_syscall(libc::SYS_rt_sigprocmask),
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allow_syscall(libc::SYS_sched_getaffinity),
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allow_syscall(libc::SYS_set_robust_list),
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allow_syscall(libc::SYS_sigaltstack),
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allow_syscall(libc::SYS_write),
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])
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}
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2020-08-04 18:12:05 +00:00
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fn virtio_console_thread_rules() -> Result<Vec<SyscallRuleSet>, Error> {
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Ok(vec![
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allow_syscall(libc::SYS_close),
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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_pwait),
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#[cfg(target_arch = "x86_64")]
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allow_syscall(libc::SYS_epoll_wait),
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allow_syscall(libc::SYS_exit),
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allow_syscall(libc::SYS_futex),
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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_prctl),
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allow_syscall(libc::SYS_read),
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allow_syscall(libc::SYS_rt_sigprocmask),
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allow_syscall(libc::SYS_sched_getaffinity),
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allow_syscall(libc::SYS_set_robust_list),
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allow_syscall(libc::SYS_sigaltstack),
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allow_syscall(libc::SYS_write),
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])
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}
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2020-08-14 21:37:01 +00:00
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fn virtio_iommu_thread_rules() -> Result<Vec<SyscallRuleSet>, Error> {
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Ok(vec![
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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_dup),
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allow_syscall(libc::SYS_epoll_pwait),
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#[cfg(target_arch = "x86_64")]
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allow_syscall(libc::SYS_epoll_wait),
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allow_syscall(libc::SYS_futex),
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allow_syscall(libc::SYS_read),
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allow_syscall(libc::SYS_write),
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])
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}
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2020-08-14 21:55:53 +00:00
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fn virtio_net_thread_rules() -> Result<Vec<SyscallRuleSet>, Error> {
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Ok(vec![
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allow_syscall(libc::SYS_close),
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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_dup),
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allow_syscall(libc::SYS_epoll_pwait),
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#[cfg(target_arch = "x86_64")]
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allow_syscall(libc::SYS_epoll_wait),
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allow_syscall(libc::SYS_exit),
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allow_syscall(libc::SYS_futex),
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allow_syscall(libc::SYS_madvise),
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allow_syscall(libc::SYS_munmap),
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allow_syscall(libc::SYS_read),
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allow_syscall(libc::SYS_rt_sigprocmask),
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allow_syscall(libc::SYS_sigaltstack),
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allow_syscall(libc::SYS_write),
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])
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}
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2020-08-14 21:49:30 +00:00
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fn virtio_net_ctl_thread_rules() -> Result<Vec<SyscallRuleSet>, Error> {
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Ok(vec![
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allow_syscall(libc::SYS_close),
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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_pwait),
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#[cfg(target_arch = "x86_64")]
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allow_syscall(libc::SYS_epoll_wait),
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allow_syscall(libc::SYS_exit),
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allow_syscall(libc::SYS_futex),
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allow_syscall(libc::SYS_madvise),
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allow_syscall(libc::SYS_munmap),
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allow_syscall(libc::SYS_read),
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allow_syscall(libc::SYS_rt_sigprocmask),
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allow_syscall(libc::SYS_sigaltstack),
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])
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}
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2020-08-04 19:25:06 +00:00
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fn virtio_pmem_thread_rules() -> Result<Vec<SyscallRuleSet>, Error> {
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Ok(vec![
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allow_syscall(libc::SYS_close),
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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_pwait),
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#[cfg(target_arch = "x86_64")]
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allow_syscall(libc::SYS_epoll_wait),
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allow_syscall(libc::SYS_exit),
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allow_syscall(libc::SYS_fsync),
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allow_syscall(libc::SYS_futex),
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allow_syscall(libc::SYS_madvise),
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allow_syscall(libc::SYS_munmap),
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allow_syscall(libc::SYS_read),
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allow_syscall(libc::SYS_rt_sigprocmask),
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allow_syscall(libc::SYS_sigaltstack),
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allow_syscall(libc::SYS_write),
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])
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}
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2020-08-04 17:46:49 +00:00
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fn virtio_rng_thread_rules() -> Result<Vec<SyscallRuleSet>, Error> {
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Ok(vec![
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allow_syscall(libc::SYS_brk),
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allow_syscall(libc::SYS_close),
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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_pwait),
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#[cfg(target_arch = "x86_64")]
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allow_syscall(libc::SYS_epoll_wait),
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allow_syscall(libc::SYS_exit),
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allow_syscall(libc::SYS_futex),
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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_prctl),
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allow_syscall(libc::SYS_read),
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allow_syscall(libc::SYS_rt_sigprocmask),
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allow_syscall(libc::SYS_sched_getaffinity),
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allow_syscall(libc::SYS_set_robust_list),
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allow_syscall(libc::SYS_sigaltstack),
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allow_syscall(libc::SYS_write),
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])
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}
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2020-08-04 02:45:53 +00:00
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fn get_seccomp_filter_trap(thread_type: Thread) -> Result<SeccompFilter, Error> {
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let rules = match thread_type {
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Thread::VirtioBlk => virtio_blk_thread_rules()?,
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Thread::VirtioConsole => virtio_console_thread_rules()?,
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Thread::VirtioIommu => virtio_iommu_thread_rules()?,
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Thread::VirtioNet => virtio_net_thread_rules()?,
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Thread::VirtioNetCtl => virtio_net_ctl_thread_rules()?,
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Thread::VirtioPmem => virtio_pmem_thread_rules()?,
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Thread::VirtioRng => virtio_rng_thread_rules()?,
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};
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Ok(SeccompFilter::new(
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rules.into_iter().collect(),
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SeccompAction::Trap,
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)?)
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}
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fn get_seccomp_filter_log(thread_type: Thread) -> Result<SeccompFilter, Error> {
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let rules = match thread_type {
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Thread::VirtioBlk => virtio_blk_thread_rules()?,
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2020-08-04 18:12:05 +00:00
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Thread::VirtioConsole => virtio_console_thread_rules()?,
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2020-08-14 21:37:01 +00:00
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Thread::VirtioIommu => virtio_iommu_thread_rules()?,
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2020-08-14 21:55:53 +00:00
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Thread::VirtioNet => virtio_net_thread_rules()?,
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2020-08-14 21:49:30 +00:00
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Thread::VirtioNetCtl => virtio_net_ctl_thread_rules()?,
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Thread::VirtioPmem => virtio_pmem_thread_rules()?,
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Thread::VirtioRng => virtio_rng_thread_rules()?,
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2020-08-04 02:45:53 +00:00
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};
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Ok(SeccompFilter::new(
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rules.into_iter().collect(),
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SeccompAction::Log,
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)?)
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}
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/// Generate a BPF program based on the seccomp_action value
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pub fn get_seccomp_filter(
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seccomp_action: &SeccompAction,
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thread_type: Thread,
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) -> Result<BpfProgram, SeccompError> {
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match seccomp_action {
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SeccompAction::Allow => Ok(vec![]),
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SeccompAction::Log => get_seccomp_filter_log(thread_type)
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.and_then(|filter| filter.try_into())
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.map_err(SeccompError::SeccompFilter),
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_ => get_seccomp_filter_trap(thread_type)
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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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