e224f77eb7
Follow up to 94faa70df4. The commit referenced allowed `ptrace` calls in the default seccomp profile following the usual tracing security checks in for Kernels newer than 4.8. Kernels prior to this version are susceptible to [CVE-2019-2054](https://github.com/advisories/GHSA-qgfr-27qf-f323). Moby's default had allowed for `ptrace` for kernels newer than 4.8 at the time the commit was created. The current [seccomp default](https://github.com/moby/moby/blob/master/profiles/seccomp/default_linux.go#L405-L417) has been updated to include `process_vm_read` and `process_vm_write`. Mirror that policy to complete the classic ptrace set of APIs.
Signed-off-by: Juan Hoyos <juan.s.hoyos@outlook.com>
749 lines
15 KiB
Go
749 lines
15 KiB
Go
//go:build linux
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// +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",
|
|
"epoll_pwait2",
|
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"epoll_wait",
|
|
"epoll_wait_old",
|
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"eventfd",
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"eventfd2",
|
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"execve",
|
|
"execveat",
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|
"exit",
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|
"exit_group",
|
|
"faccessat",
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|
"faccessat2",
|
|
"fadvise64",
|
|
"fadvise64_64",
|
|
"fallocate",
|
|
"fanotify_mark",
|
|
"fchdir",
|
|
"fchmod",
|
|
"fchmodat",
|
|
"fchown",
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|
"fchown32",
|
|
"fchownat",
|
|
"fcntl",
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|
"fcntl64",
|
|
"fdatasync",
|
|
"fgetxattr",
|
|
"flistxattr",
|
|
"flock",
|
|
"fork",
|
|
"fremovexattr",
|
|
"fsetxattr",
|
|
"fstat",
|
|
"fstat64",
|
|
"fstatat64",
|
|
"fstatfs",
|
|
"fstatfs64",
|
|
"fsync",
|
|
"ftruncate",
|
|
"ftruncate64",
|
|
"futex",
|
|
"futex_time64",
|
|
"futex_waitv",
|
|
"futimesat",
|
|
"getcpu",
|
|
"getcwd",
|
|
"getdents",
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|
"getdents64",
|
|
"getegid",
|
|
"getegid32",
|
|
"geteuid",
|
|
"geteuid32",
|
|
"getgid",
|
|
"getgid32",
|
|
"getgroups",
|
|
"getgroups32",
|
|
"getitimer",
|
|
"getpeername",
|
|
"getpgid",
|
|
"getpgrp",
|
|
"getpid",
|
|
"getppid",
|
|
"getpriority",
|
|
"getrandom",
|
|
"getresgid",
|
|
"getresgid32",
|
|
"getresuid",
|
|
"getresuid32",
|
|
"getrlimit",
|
|
"get_robust_list",
|
|
"getrusage",
|
|
"getsid",
|
|
"getsockname",
|
|
"getsockopt",
|
|
"get_thread_area",
|
|
"gettid",
|
|
"gettimeofday",
|
|
"getuid",
|
|
"getuid32",
|
|
"getxattr",
|
|
"inotify_add_watch",
|
|
"inotify_init",
|
|
"inotify_init1",
|
|
"inotify_rm_watch",
|
|
"io_cancel",
|
|
"ioctl",
|
|
"io_destroy",
|
|
"io_getevents",
|
|
"io_pgetevents",
|
|
"io_pgetevents_time64",
|
|
"ioprio_get",
|
|
"ioprio_set",
|
|
"io_setup",
|
|
"io_submit",
|
|
"io_uring_enter",
|
|
"io_uring_register",
|
|
"io_uring_setup",
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|
"ipc",
|
|
"kill",
|
|
"landlock_add_rule",
|
|
"landlock_create_ruleset",
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|
"landlock_restrict_self",
|
|
"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",
|
|
"memfd_create",
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"memfd_secret",
|
|
"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",
|
|
"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",
|
|
"msgget",
|
|
"msgrcv",
|
|
"msgsnd",
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|
"msync",
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|
"munlock",
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|
"munlockall",
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|
"munmap",
|
|
"nanosleep",
|
|
"newfstatat",
|
|
"_newselect",
|
|
"open",
|
|
"openat",
|
|
"openat2",
|
|
"pause",
|
|
"pidfd_open",
|
|
"pidfd_send_signal",
|
|
"pipe",
|
|
"pipe2",
|
|
"pkey_alloc",
|
|
"pkey_free",
|
|
"pkey_mprotect",
|
|
"poll",
|
|
"ppoll",
|
|
"ppoll_time64",
|
|
"prctl",
|
|
"pread64",
|
|
"preadv",
|
|
"preadv2",
|
|
"prlimit64",
|
|
"process_mrelease",
|
|
"pselect6",
|
|
"pselect6_time64",
|
|
"pwrite64",
|
|
"pwritev",
|
|
"pwritev2",
|
|
"read",
|
|
"readahead",
|
|
"readlink",
|
|
"readlinkat",
|
|
"readv",
|
|
"recv",
|
|
"recvfrom",
|
|
"recvmmsg",
|
|
"recvmmsg_time64",
|
|
"recvmsg",
|
|
"remap_file_pages",
|
|
"removexattr",
|
|
"rename",
|
|
"renameat",
|
|
"renameat2",
|
|
"restart_syscall",
|
|
"rmdir",
|
|
"rseq",
|
|
"rt_sigaction",
|
|
"rt_sigpending",
|
|
"rt_sigprocmask",
|
|
"rt_sigqueueinfo",
|
|
"rt_sigreturn",
|
|
"rt_sigsuspend",
|
|
"rt_sigtimedwait",
|
|
"rt_sigtimedwait_time64",
|
|
"rt_tgsigqueueinfo",
|
|
"sched_getaffinity",
|
|
"sched_getattr",
|
|
"sched_getparam",
|
|
"sched_get_priority_max",
|
|
"sched_get_priority_min",
|
|
"sched_getscheduler",
|
|
"sched_rr_get_interval",
|
|
"sched_rr_get_interval_time64",
|
|
"sched_setaffinity",
|
|
"sched_setattr",
|
|
"sched_setparam",
|
|
"sched_setscheduler",
|
|
"sched_yield",
|
|
"seccomp",
|
|
"select",
|
|
"semctl",
|
|
"semget",
|
|
"semop",
|
|
"semtimedop",
|
|
"semtimedop_time64",
|
|
"send",
|
|
"sendfile",
|
|
"sendfile64",
|
|
"sendmmsg",
|
|
"sendmsg",
|
|
"sendto",
|
|
"setfsgid",
|
|
"setfsgid32",
|
|
"setfsuid",
|
|
"setfsuid32",
|
|
"setgid",
|
|
"setgid32",
|
|
"setgroups",
|
|
"setgroups32",
|
|
"setitimer",
|
|
"setpgid",
|
|
"setpriority",
|
|
"setregid",
|
|
"setregid32",
|
|
"setresgid",
|
|
"setresgid32",
|
|
"setresuid",
|
|
"setresuid32",
|
|
"setreuid",
|
|
"setreuid32",
|
|
"setrlimit",
|
|
"set_robust_list",
|
|
"setsid",
|
|
"setsockopt",
|
|
"set_thread_area",
|
|
"set_tid_address",
|
|
"setuid",
|
|
"setuid32",
|
|
"setxattr",
|
|
"shmat",
|
|
"shmctl",
|
|
"shmdt",
|
|
"shmget",
|
|
"shutdown",
|
|
"sigaltstack",
|
|
"signalfd",
|
|
"signalfd4",
|
|
"sigprocmask",
|
|
"sigreturn",
|
|
"socketcall",
|
|
"socketpair",
|
|
"splice",
|
|
"stat",
|
|
"stat64",
|
|
"statfs",
|
|
"statfs64",
|
|
"statx",
|
|
"symlink",
|
|
"symlinkat",
|
|
"sync",
|
|
"sync_file_range",
|
|
"syncfs",
|
|
"sysinfo",
|
|
"tee",
|
|
"tgkill",
|
|
"time",
|
|
"timer_create",
|
|
"timer_delete",
|
|
"timer_getoverrun",
|
|
"timer_gettime",
|
|
"timer_gettime64",
|
|
"timer_settime",
|
|
"timer_settime64",
|
|
"timerfd_create",
|
|
"timerfd_gettime",
|
|
"timerfd_gettime64",
|
|
"timerfd_settime",
|
|
"timerfd_settime64",
|
|
"times",
|
|
"tkill",
|
|
"truncate",
|
|
"truncate64",
|
|
"ugetrlimit",
|
|
"umask",
|
|
"uname",
|
|
"unlink",
|
|
"unlinkat",
|
|
"utime",
|
|
"utimensat",
|
|
"utimensat_time64",
|
|
"utimes",
|
|
"vfork",
|
|
"vmsplice",
|
|
"wait4",
|
|
"waitid",
|
|
"waitpid",
|
|
"write",
|
|
"writev",
|
|
},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
},
|
|
{
|
|
Names: []string{"socket"},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{
|
|
{
|
|
Index: 0,
|
|
Value: unix.AF_VSOCK,
|
|
Op: specs.OpNotEqual,
|
|
},
|
|
},
|
|
},
|
|
{
|
|
Names: []string{"personality"},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{
|
|
{
|
|
Index: 0,
|
|
Value: 0x0,
|
|
Op: specs.OpEqualTo,
|
|
},
|
|
},
|
|
},
|
|
{
|
|
Names: []string{"personality"},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{
|
|
{
|
|
Index: 0,
|
|
Value: 0x0008,
|
|
Op: specs.OpEqualTo,
|
|
},
|
|
},
|
|
},
|
|
{
|
|
Names: []string{"personality"},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{
|
|
{
|
|
Index: 0,
|
|
Value: 0x20000,
|
|
Op: specs.OpEqualTo,
|
|
},
|
|
},
|
|
},
|
|
{
|
|
Names: []string{"personality"},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{
|
|
{
|
|
Index: 0,
|
|
Value: 0x20008,
|
|
Op: specs.OpEqualTo,
|
|
},
|
|
},
|
|
},
|
|
{
|
|
Names: []string{"personality"},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{
|
|
{
|
|
Index: 0,
|
|
Value: 0xffffffff,
|
|
Op: specs.OpEqualTo,
|
|
},
|
|
},
|
|
},
|
|
}
|
|
|
|
s := &specs.LinuxSeccomp{
|
|
DefaultAction: specs.ActErrno,
|
|
Architectures: arches(),
|
|
Syscalls: syscalls,
|
|
}
|
|
|
|
// include by kernel version
|
|
if ok, err := kernelversion.GreaterEqualThan(
|
|
kernelversion.KernelVersion{Kernel: 4, Major: 8}); err == nil {
|
|
if ok {
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{
|
|
"process_vm_read",
|
|
"process_vm_write",
|
|
"ptrace",
|
|
},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
})
|
|
}
|
|
}
|
|
|
|
// include by arch
|
|
switch runtime.GOARCH {
|
|
case "ppc64le":
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{
|
|
"sync_file_range2",
|
|
"swapcontext",
|
|
},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
})
|
|
case "arm", "arm64":
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{
|
|
"arm_fadvise64_64",
|
|
"arm_sync_file_range",
|
|
"sync_file_range2",
|
|
"breakpoint",
|
|
"cacheflush",
|
|
"set_tls",
|
|
},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
})
|
|
case "amd64":
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{
|
|
"arch_prctl",
|
|
"modify_ldt",
|
|
},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
})
|
|
case "386":
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{
|
|
"modify_ldt",
|
|
},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
})
|
|
case "s390", "s390x":
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{
|
|
"s390_pci_mmio_read",
|
|
"s390_pci_mmio_write",
|
|
"s390_runtime_instr",
|
|
},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
})
|
|
case "riscv64":
|
|
s.Syscalls = append(s.Syscalls, specs.LinuxSyscall{
|
|
Names: []string{
|
|
"riscv_flush_icache",
|
|
},
|
|
Action: specs.ActAllow,
|
|
Args: []specs.LinuxSeccompArg{},
|
|
})
|
|
}
|
|
|
|
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
|
|
}
|