748 lines
15 KiB
Go
748 lines
15 KiB
Go
//go:build linux
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/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package seccomp
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import (
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"runtime"
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"golang.org/x/sys/unix"
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"github.com/containerd/containerd/contrib/seccomp/kernelversion"
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"github.com/opencontainers/runtime-spec/specs-go"
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)
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func arches() []specs.Arch {
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switch runtime.GOARCH {
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case "amd64":
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return []specs.Arch{specs.ArchX86_64, specs.ArchX86, specs.ArchX32}
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case "arm64":
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return []specs.Arch{specs.ArchARM, specs.ArchAARCH64}
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case "mips64":
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return []specs.Arch{specs.ArchMIPS, specs.ArchMIPS64, specs.ArchMIPS64N32}
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case "mips64n32":
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return []specs.Arch{specs.ArchMIPS, specs.ArchMIPS64, specs.ArchMIPS64N32}
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case "mipsel64":
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return []specs.Arch{specs.ArchMIPSEL, specs.ArchMIPSEL64, specs.ArchMIPSEL64N32}
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case "mipsel64n32":
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return []specs.Arch{specs.ArchMIPSEL, specs.ArchMIPSEL64, specs.ArchMIPSEL64N32}
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case "s390x":
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return []specs.Arch{specs.ArchS390, specs.ArchS390X}
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case "riscv64":
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// ArchRISCV32 (SCMP_ARCH_RISCV32) does not exist
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return []specs.Arch{specs.ArchRISCV64}
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default:
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return []specs.Arch{}
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}
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}
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// DefaultProfile defines the allowed syscalls for the default seccomp profile.
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func DefaultProfile(sp *specs.Spec) *specs.LinuxSeccomp {
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nosys := uint(unix.ENOSYS)
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syscalls := []specs.LinuxSyscall{
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{
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Names: []string{
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"accept",
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"accept4",
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"access",
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"adjtimex",
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"alarm",
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"bind",
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"brk",
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"capget",
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"capset",
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"chdir",
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"chmod",
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"chown",
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"chown32",
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"clock_adjtime",
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"clock_adjtime64",
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"clock_getres",
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"clock_getres_time64",
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"clock_gettime",
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"clock_gettime64",
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"clock_nanosleep",
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"clock_nanosleep_time64",
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"close",
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"close_range",
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"connect",
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"copy_file_range",
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"creat",
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"dup",
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"dup2",
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"dup3",
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"epoll_create",
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"epoll_create1",
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"epoll_ctl",
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"epoll_ctl_old",
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"epoll_pwait",
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"epoll_pwait2",
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"epoll_wait",
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"epoll_wait_old",
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"eventfd",
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"eventfd2",
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"execve",
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"execveat",
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"exit",
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"exit_group",
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"faccessat",
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"faccessat2",
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"fadvise64",
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"fadvise64_64",
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"fallocate",
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"fanotify_mark",
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"fchdir",
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"fchmod",
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"fchmodat",
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"fchown",
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"fchown32",
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"fchownat",
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"fcntl",
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"fcntl64",
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"fdatasync",
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"fgetxattr",
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"flistxattr",
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"flock",
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"fork",
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"fremovexattr",
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"fsetxattr",
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"fstat",
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"fstat64",
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"fstatat64",
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"fstatfs",
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"fstatfs64",
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"fsync",
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"ftruncate",
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"ftruncate64",
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"futex",
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"futex_time64",
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"futex_waitv",
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"futimesat",
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"getcpu",
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"getcwd",
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"getdents",
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"getdents64",
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"getegid",
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"getegid32",
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"geteuid",
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"geteuid32",
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"getgid",
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"getgid32",
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"getgroups",
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"getgroups32",
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"getitimer",
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"getpeername",
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"getpgid",
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"getpgrp",
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"getpid",
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"getppid",
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"getpriority",
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"getrandom",
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"getresgid",
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"getresgid32",
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"getresuid",
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"getresuid32",
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"getrlimit",
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"get_robust_list",
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"getrusage",
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"getsid",
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"getsockname",
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"getsockopt",
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"get_thread_area",
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"gettid",
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"gettimeofday",
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"getuid",
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"getuid32",
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"getxattr",
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"inotify_add_watch",
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"inotify_init",
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"inotify_init1",
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"inotify_rm_watch",
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"io_cancel",
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"ioctl",
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"io_destroy",
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"io_getevents",
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"io_pgetevents",
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"io_pgetevents_time64",
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"ioprio_get",
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"ioprio_set",
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"io_setup",
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"io_submit",
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"io_uring_enter",
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"io_uring_register",
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"io_uring_setup",
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"ipc",
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"kill",
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"landlock_add_rule",
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"landlock_create_ruleset",
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"landlock_restrict_self",
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"lchown",
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"lchown32",
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"lgetxattr",
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"link",
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"linkat",
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"listen",
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"listxattr",
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"llistxattr",
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"_llseek",
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"lremovexattr",
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"lseek",
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"lsetxattr",
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"lstat",
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"lstat64",
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"madvise",
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"membarrier",
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"memfd_create",
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"memfd_secret",
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"mincore",
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"mkdir",
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"mkdirat",
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"mknod",
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"mknodat",
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"mlock",
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"mlock2",
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"mlockall",
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"mmap",
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"mmap2",
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"mprotect",
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"mq_getsetattr",
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"mq_notify",
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"mq_open",
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"mq_timedreceive",
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"mq_timedreceive_time64",
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"mq_timedsend",
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"mq_timedsend_time64",
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"mq_unlink",
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"mremap",
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"msgctl",
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"msgget",
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"msgrcv",
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"msgsnd",
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"msync",
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"munlock",
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"munlockall",
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"munmap",
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"nanosleep",
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"newfstatat",
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"_newselect",
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"open",
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"openat",
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"openat2",
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"pause",
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"pidfd_open",
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"pidfd_send_signal",
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"pipe",
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"pipe2",
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"pkey_alloc",
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"pkey_free",
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"pkey_mprotect",
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"poll",
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"ppoll",
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"ppoll_time64",
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"prctl",
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"pread64",
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"preadv",
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"preadv2",
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"prlimit64",
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"process_mrelease",
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"pselect6",
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"pselect6_time64",
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"pwrite64",
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"pwritev",
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"pwritev2",
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"read",
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"readahead",
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"readlink",
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"readlinkat",
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"readv",
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"recv",
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"recvfrom",
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"recvmmsg",
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"recvmmsg_time64",
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"recvmsg",
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"remap_file_pages",
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"removexattr",
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"rename",
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"renameat",
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"renameat2",
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"restart_syscall",
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"rmdir",
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"rseq",
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"rt_sigaction",
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"rt_sigpending",
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"rt_sigprocmask",
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"rt_sigqueueinfo",
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"rt_sigreturn",
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"rt_sigsuspend",
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"rt_sigtimedwait",
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"rt_sigtimedwait_time64",
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"rt_tgsigqueueinfo",
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"sched_getaffinity",
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"sched_getattr",
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"sched_getparam",
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"sched_get_priority_max",
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"sched_get_priority_min",
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"sched_getscheduler",
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"sched_rr_get_interval",
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"sched_rr_get_interval_time64",
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"sched_setaffinity",
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"sched_setattr",
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"sched_setparam",
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"sched_setscheduler",
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"sched_yield",
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"seccomp",
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"select",
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"semctl",
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"semget",
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"semop",
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"semtimedop",
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"semtimedop_time64",
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"send",
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"sendfile",
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"sendfile64",
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"sendmmsg",
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"sendmsg",
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"sendto",
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"setfsgid",
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"setfsgid32",
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"setfsuid",
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"setfsuid32",
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"setgid",
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"setgid32",
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"setgroups",
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"setgroups32",
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"setitimer",
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"setpgid",
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"setpriority",
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"setregid",
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"setregid32",
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"setresgid",
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"setresgid32",
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"setresuid",
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"setresuid32",
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"setreuid",
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"setreuid32",
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"setrlimit",
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"set_robust_list",
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"setsid",
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"setsockopt",
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"set_thread_area",
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"set_tid_address",
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"setuid",
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"setuid32",
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"setxattr",
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"shmat",
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"shmctl",
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"shmdt",
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"shmget",
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"shutdown",
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"sigaltstack",
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"signalfd",
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"signalfd4",
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"sigprocmask",
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"sigreturn",
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"socketcall",
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"socketpair",
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"splice",
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"stat",
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"stat64",
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"statfs",
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"statfs64",
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"statx",
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"symlink",
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"symlinkat",
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"sync",
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"sync_file_range",
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"syncfs",
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"sysinfo",
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"tee",
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"tgkill",
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"time",
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"timer_create",
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"timer_delete",
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"timer_getoverrun",
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"timer_gettime",
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"timer_gettime64",
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"timer_settime",
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"timer_settime64",
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"timerfd_create",
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"timerfd_gettime",
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"timerfd_gettime64",
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"timerfd_settime",
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"timerfd_settime64",
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"times",
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"tkill",
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"truncate",
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"truncate64",
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"ugetrlimit",
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"umask",
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"uname",
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"unlink",
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"unlinkat",
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"utime",
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"utimensat",
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"utimensat_time64",
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"utimes",
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"vfork",
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"vmsplice",
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"wait4",
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"waitid",
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"waitpid",
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"write",
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"writev",
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},
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Action: specs.ActAllow,
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Args: []specs.LinuxSeccompArg{},
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},
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{
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Names: []string{"socket"},
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Action: specs.ActAllow,
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Args: []specs.LinuxSeccompArg{
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{
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Index: 0,
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Value: unix.AF_VSOCK,
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Op: specs.OpNotEqual,
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},
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},
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},
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{
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Names: []string{"personality"},
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Action: specs.ActAllow,
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Args: []specs.LinuxSeccompArg{
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{
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Index: 0,
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Value: 0x0,
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Op: specs.OpEqualTo,
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},
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},
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},
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{
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Names: []string{"personality"},
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Action: specs.ActAllow,
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Args: []specs.LinuxSeccompArg{
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{
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Index: 0,
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Value: 0x0008,
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Op: specs.OpEqualTo,
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},
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},
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},
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{
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Names: []string{"personality"},
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Action: specs.ActAllow,
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Args: []specs.LinuxSeccompArg{
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{
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Index: 0,
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Value: 0x20000,
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Op: specs.OpEqualTo,
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},
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},
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},
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{
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Names: []string{"personality"},
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Action: specs.ActAllow,
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Args: []specs.LinuxSeccompArg{
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{
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Index: 0,
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Value: 0x20008,
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Op: specs.OpEqualTo,
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},
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},
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},
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{
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Names: []string{"personality"},
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Action: specs.ActAllow,
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Args: []specs.LinuxSeccompArg{
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{
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Index: 0,
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Value: 0xffffffff,
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Op: specs.OpEqualTo,
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},
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},
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},
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}
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s := &specs.LinuxSeccomp{
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DefaultAction: specs.ActErrno,
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Architectures: arches(),
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Syscalls: syscalls,
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}
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|
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// include by kernel version
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if ok, err := kernelversion.GreaterEqualThan(
|
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kernelversion.KernelVersion{Kernel: 4, Major: 8}); err == nil {
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if ok {
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s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
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Names: []string{
|
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"process_vm_readv",
|
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"process_vm_writev",
|
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"ptrace",
|
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},
|
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Action: specs.ActAllow,
|
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Args: []specs.LinuxSeccompArg{},
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})
|
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}
|
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}
|
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|
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// include by arch
|
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switch runtime.GOARCH {
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case "ppc64le":
|
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s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
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Names: []string{
|
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"sync_file_range2",
|
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"swapcontext",
|
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},
|
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Action: specs.ActAllow,
|
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Args: []specs.LinuxSeccompArg{},
|
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})
|
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case "arm", "arm64":
|
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s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
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Names: []string{
|
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"arm_fadvise64_64",
|
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"arm_sync_file_range",
|
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"sync_file_range2",
|
|
"breakpoint",
|
|
"cacheflush",
|
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"set_tls",
|
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},
|
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Action: specs.ActAllow,
|
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Args: []specs.LinuxSeccompArg{},
|
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})
|
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case "amd64":
|
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s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
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Names: []string{
|
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"arch_prctl",
|
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"modify_ldt",
|
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},
|
|
Action: specs.ActAllow,
|
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Args: []specs.LinuxSeccompArg{},
|
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})
|
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case "386":
|
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s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
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Names: []string{
|
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"modify_ldt",
|
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},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
})
|
|
case "s390", "s390x":
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{
|
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"s390_pci_mmio_read",
|
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"s390_pci_mmio_write",
|
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"s390_runtime_instr",
|
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},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
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})
|
|
case "riscv64":
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
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Names: []string{
|
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"riscv_flush_icache",
|
|
},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
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})
|
|
}
|
|
|
|
admin := false
|
|
for _, c := range sp.Process.Capabilities.Bounding {
|
|
switch c {
|
|
case "CAP_DAC_READ_SEARCH":
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{"open_by_handle_at"},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
})
|
|
case "CAP_SYS_ADMIN":
|
|
admin = true
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{
|
|
"bpf",
|
|
"clone",
|
|
"clone3",
|
|
"fanotify_init",
|
|
"fsconfig",
|
|
"fsmount",
|
|
"fsopen",
|
|
"fspick",
|
|
"lookup_dcookie",
|
|
"mount",
|
|
"mount_setattr",
|
|
"move_mount",
|
|
"name_to_handle_at",
|
|
"open_tree",
|
|
"perf_event_open",
|
|
"quotactl",
|
|
"quotactl_fd",
|
|
"setdomainname",
|
|
"sethostname",
|
|
"setns",
|
|
"syslog",
|
|
"umount",
|
|
"umount2",
|
|
"unshare",
|
|
},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
})
|
|
case "CAP_SYS_BOOT":
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{"reboot"},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
})
|
|
case "CAP_SYS_CHROOT":
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{"chroot"},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
})
|
|
case "CAP_SYS_MODULE":
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{
|
|
"delete_module",
|
|
"init_module",
|
|
"finit_module",
|
|
},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
})
|
|
case "CAP_SYS_PACCT":
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{"acct"},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
})
|
|
case "CAP_SYS_PTRACE":
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{
|
|
"kcmp",
|
|
"pidfd_getfd",
|
|
"process_madvise",
|
|
"process_vm_readv",
|
|
"process_vm_writev",
|
|
"ptrace",
|
|
},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
})
|
|
case "CAP_SYS_RAWIO":
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{
|
|
"iopl",
|
|
"ioperm",
|
|
},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
})
|
|
case "CAP_SYS_TIME":
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{
|
|
"settimeofday",
|
|
"stime",
|
|
"clock_settime",
|
|
"clock_settime64",
|
|
},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
})
|
|
case "CAP_SYS_TTY_CONFIG":
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{"vhangup"},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
})
|
|
case "CAP_SYS_NICE":
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{
|
|
"get_mempolicy",
|
|
"mbind",
|
|
"set_mempolicy",
|
|
},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
})
|
|
case "CAP_SYSLOG":
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{"syslog"},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
})
|
|
case "CAP_BPF":
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{"bpf"},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
})
|
|
case "CAP_PERFMON":
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{"perf_event_open"},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
})
|
|
}
|
|
}
|
|
|
|
if !admin {
|
|
switch runtime.GOARCH {
|
|
case "s390", "s390x":
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{
|
|
"clone",
|
|
},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{
|
|
{
|
|
Index: 1,
|
|
Value: unix.CLONE_NEWNS | unix.CLONE_NEWUTS | unix.CLONE_NEWIPC | unix.CLONE_NEWUSER | unix.CLONE_NEWPID | unix.CLONE_NEWNET | unix.CLONE_NEWCGROUP,
|
|
ValueTwo: 0,
|
|
Op: specs.OpMaskedEqual,
|
|
},
|
|
},
|
|
})
|
|
default:
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{
|
|
"clone",
|
|
},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{
|
|
{
|
|
Index: 0,
|
|
Value: unix.CLONE_NEWNS | unix.CLONE_NEWUTS | unix.CLONE_NEWIPC | unix.CLONE_NEWUSER | unix.CLONE_NEWPID | unix.CLONE_NEWNET | unix.CLONE_NEWCGROUP,
|
|
ValueTwo: 0,
|
|
Op: specs.OpMaskedEqual,
|
|
},
|
|
},
|
|
})
|
|
}
|
|
// clone3 is explicitly requested to give ENOSYS instead of the default EPERM, when CAP_SYS_ADMIN is unset
|
|
// https://github.com/moby/moby/pull/42681
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{
|
|
"clone3",
|
|
},
|
|
Action: specs.ActErrno,
|
|
ErrnoRet: &nosys,
|
|
})
|
|
}
|
|
|
|
return s
|
|
}
|