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6d2a834827
Add a frequency file that teaches the seccomp compiler to weight the comparison tree in favor of the most frequenctly called syscalls. This frequency file was created by running strace against vm_conciege's pid (e.g., "strace -p PID -ff -e raw=all -o /tmp/strace") when performing a start and stop of a VM, deleting the trace files that weren't for a crosvm process, passing the files to minijail's tools/generate_seccomp_policy.py (using the -frequency option), and combining the results of the frequency file. I rounded the #s to the nearest multiple of 5 and only retained the syscalls that had at least 10 calls. BUG=None TEST=Local build and deploy. Verified that crostini VM still boots and shuts down properly. Used scmp_bpf_disasm to disassemble a few bpf files before and after this change to confirm that with the frequency file the first comparision is "jge 2" (to quickly whitelist syscalls 0 and 1 ['read' and 'write']) instead of a comparison around the middle of the range of syscall numbers that are used. Change-Id: Icace2b5cdbcae6e51cfd67a3034a1a17fdb6d59e Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2005793 Commit-Queue: Matt Delco <delco@chromium.org> Commit-Queue: Stephen Barber <smbarber@chromium.org> Tested-by: Matt Delco <delco@chromium.org> Tested-by: kokoro <noreply+kokoro@google.com> Auto-Submit: Matt Delco <delco@chromium.org> Reviewed-by: Stephen Barber <smbarber@chromium.org>
46 lines
663 B
Text
46 lines
663 B
Text
# Copyright 2020 The Chromium OS Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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capget: 30
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capset: 30
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chdir: 30
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chroot: 15
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clone: 30
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close: 1185
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dup: 50
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dup2: 160
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epoll_ctl: 25
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epoll_wait: 90
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eventfd2: 75
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exit: 15
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exit_group: 15
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fchdir: 30
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fstat: 90
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futex: 20
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getdents: 55
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ioctl: 350
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mmap: 95
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mount: 45
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mprotect: 45
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openat: 515
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pipe: 15
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pivot_root: 15
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prctl: 570
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prlimit64: 15
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read: 82415
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recvmsg: 85
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restart_syscall: 15
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rt_sigaction: 20
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rt_sigreturn: 15
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seccomp: 25
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sendmsg: 390
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setsockopt: 30
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socket: 20
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socketpair: 30
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stat: 30
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umount2: 15
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unshare: 30
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wait4: 20
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write: 56100
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