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Switch seccomp sandbox to default-deny filter
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@ -52,28 +52,54 @@ static inline int seccomp(unsigned int operation, unsigned int flags, void *args
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#define KILL_PROCESS \
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BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_KILL)
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#define DENY_SYSCALL(name) \
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BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, __NR_##name, 0, 1), \
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BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_KILL_PROCESS)
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static sock_filter filter[] = {
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VALIDATE_ARCHITECTURE,
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EXAMINE_SYSCALL,
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// examples of undesirable syscalls
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DENY_SYSCALL(execve),
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DENY_SYSCALL(fork),
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DENY_SYSCALL(vfork),
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DENY_SYSCALL(clone),
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DENY_SYSCALL(connect),
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DENY_SYSCALL(listen),
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DENY_SYSCALL(bind),
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DENY_SYSCALL(kill),
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DENY_SYSCALL(settimeofday),
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// etc
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// memory management
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ALLOW_SYSCALL(mmap),
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ALLOW_SYSCALL(munmap),
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ALLOW_SYSCALL(mprotect),
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ALLOW_SYSCALL(madvise),
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ALLOW_SYSCALL(brk),
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// default-permit mode
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BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW)
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// basic file IO
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ALLOW_SYSCALL(open),
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ALLOW_SYSCALL(openat),
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ALLOW_SYSCALL(read),
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ALLOW_SYSCALL(write),
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ALLOW_SYSCALL(close),
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ALLOW_SYSCALL(stat),
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ALLOW_SYSCALL(fstat),
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ALLOW_SYSCALL(fsync), // maybe
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ALLOW_SYSCALL(creat), // maybe; for DB journal
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ALLOW_SYSCALL(unlink), // for DB journal
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// more IO
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ALLOW_SYSCALL(pread64),
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ALLOW_SYSCALL(pwrite64),
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ALLOW_SYSCALL(fdatasync),
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// misc libc things
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ALLOW_SYSCALL(getcwd),
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ALLOW_SYSCALL(getpid),
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ALLOW_SYSCALL(geteuid),
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ALLOW_SYSCALL(fcntl),
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ALLOW_SYSCALL(exit),
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ALLOW_SYSCALL(exit_group),
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// threading
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ALLOW_SYSCALL(futex),
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// networking
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ALLOW_SYSCALL(poll),
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ALLOW_SYSCALL(accept),
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ALLOW_SYSCALL(setsockopt),
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ALLOW_SYSCALL(sendto),
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ALLOW_SYSCALL(recvfrom),
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ALLOW_SYSCALL(shutdown),
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BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_KILL_PROCESS)
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};
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static sock_fprog prog = {
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