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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>
47 lines
815 B
Text
47 lines
815 B
Text
# Copyright 2019 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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@frequency ./common_device.frequency
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brk: 1
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clone: arg0 & CLONE_THREAD
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close: 1
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dup2: 1
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dup: 1
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epoll_create1: 1
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epoll_ctl: 1
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epoll_wait: 1
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eventfd2: 1
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exit: 1
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exit_group: 1
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futex: 1
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getpid: 1
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gettid: 1
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gettimeofday: 1
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kill: 1
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madvise: arg2 == MADV_DONTNEED || arg2 == MADV_DONTDUMP || arg2 == MADV_REMOVE
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mmap: arg2 in ~PROT_EXEC
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mprotect: arg2 in ~PROT_EXEC
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mremap: 1
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munmap: 1
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nanosleep: 1
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pipe2: 1
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poll: 1
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ppoll: 1
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prctl: arg0 == PR_SET_NAME
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read: 1
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readv: 1
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recvfrom: 1
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recvmsg: 1
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restart_syscall: 1
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rt_sigaction: 1
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rt_sigprocmask: 1
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rt_sigreturn: 1
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sched_getaffinity: 1
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sendmsg: 1
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sendto: 1
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set_robust_list: 1
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sigaltstack: 1
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write: 1
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writev: 1
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