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Whitelist syscalls for musl-libc, Raspberry Pi and alt libsqlite configs
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@ -52,12 +52,30 @@ 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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/*
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* The main supported configuration is Linux on x86_64 with either glibc or
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* musl-libc, with secondary support for Linux on the Raspberry Pi (ARM).
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*
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* Syscalls marked with "maybe" don't seem to be used in the default
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* configuration, but should probably be whitelisted anyway.
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*
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* Syscalls marked with "musl-libc", "raspi" or "alt DB" were observed to be
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* necessary on that configuration, but are probably neccessary in other
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* configurations as well. ("alt DB" represents libsqlite compiled with
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* different options.)
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*
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* Syscalls marked "vdso" aren't normally caught by seccomp because they are
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* implemented in the vdso(7) in most configurations, but it's still prudent
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* to whitelist them here.
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*/
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static sock_filter filter[] = {
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VALIDATE_ARCHITECTURE,
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EXAMINE_SYSCALL,
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// memory management
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#ifdef __NR_mmap
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ALLOW_SYSCALL(mmap),
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#endif
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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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@ -74,19 +92,25 @@ static sock_filter filter[] = {
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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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ALLOW_SYSCALL(lseek), // musl-libc; alt DB
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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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ALLOW_SYSCALL(writev), // musl-libc
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ALLOW_SYSCALL(preadv), // maybe; alt-DB
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ALLOW_SYSCALL(preadv2), // maybe
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// misc libc things
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// misc syscalls called from libc
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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(ioctl), // musl-libc
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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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ALLOW_SYSCALL(rt_sigprocmask), // musl-libc
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// threading
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ALLOW_SYSCALL(futex),
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@ -99,6 +123,46 @@ static sock_filter filter[] = {
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ALLOW_SYSCALL(recvfrom),
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ALLOW_SYSCALL(shutdown),
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// vdso
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ALLOW_SYSCALL(clock_gettime),
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ALLOW_SYSCALL(gettimeofday),
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#ifdef __NR_time
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ALLOW_SYSCALL(time),
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#endif
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ALLOW_SYSCALL(rt_sigreturn),
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// Raspberry Pi (ARM)
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#ifdef __NR_set_robust_list
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ALLOW_SYSCALL(set_robust_list),
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#endif
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#ifdef __NR_clock_gettime64
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ALLOW_SYSCALL(clock_gettime64),
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#endif
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#ifdef __NR_mmap2
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ALLOW_SYSCALL(mmap2),
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#endif
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#ifdef __NR_fcntl64
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ALLOW_SYSCALL(fcntl64),
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#endif
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#ifdef __NR_stat64
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ALLOW_SYSCALL(stat64),
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#endif
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#ifdef __NR_send
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ALLOW_SYSCALL(send),
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#endif
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#ifdef __NR_recv
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ALLOW_SYSCALL(recv),
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#endif
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#ifdef __NR_fstat64
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ALLOW_SYSCALL(fstat64),
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#endif
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#ifdef __NR_geteuid32
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ALLOW_SYSCALL(geteuid32),
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#endif
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#ifdef __NR_sigreturn
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ALLOW_SYSCALL(sigreturn), // vdso
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#endif
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BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_KILL_PROCESS)
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};
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