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[seccomp] Add support for AArch64
This is useful for 64-bit Raspberry Pis and other 64-bit ARM systems.
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@ -31,6 +31,8 @@
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# define ARCH_NR AUDIT_ARCH_X86_64
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#elif defined(__arm__)
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# define ARCH_NR AUDIT_ARCH_ARM
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#elif defined(__aarch64__)
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# define ARCH_NR AUDIT_ARCH_AARCH64
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#else
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# error "Seccomp-bpf sandbox unsupported on this architecture"
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#endif
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@ -105,9 +107,18 @@
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BPF_STMT(BPF_LD+BPF_W+BPF_ABS, \
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offsetof(struct seccomp_data, nr))
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/*
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* This is a special case for AArch64 where this syscall apparently only
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* exists in 32-bit compatibility mode, so we can't include the definition
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* even though it gets called somewhere in libc.
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*/
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#if defined(__aarch64__) && !defined(__NR_fstatat64)
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#define __NR_fstatat64 0x4f
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#endif
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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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* musl-libc, with secondary support for x86, ARM and ARM64 (AAarch64) Linux.
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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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@ -135,16 +146,24 @@ static sock_filter filter[] = {
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ALLOW_SYSCALL(brk),
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// basic file IO
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#ifdef __NR_open
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ALLOW_SYSCALL(open),
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#endif
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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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#if __NR_stat
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ALLOW_SYSCALL(stat),
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#endif
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ALLOW_SYSCALL(fstat),
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ALLOW_SYSCALL(fsync), // maybe
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#if __NR_creat
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ALLOW_SYSCALL(creat), // maybe; for DB journal
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#endif
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#if __NR_unlink
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ALLOW_SYSCALL(unlink), // for DB journal
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#endif
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ALLOW_SYSCALL(lseek), // musl-libc; alt DB
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ALLOW_SYSCALL(truncate), // for truncate-mode DB
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ALLOW_SYSCALL(ftruncate), // for truncate-mode DB
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@ -183,7 +202,9 @@ static sock_filter filter[] = {
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ALLOW_SYSCALL(futex),
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// networking
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#ifdef __NR_poll
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ALLOW_SYSCALL(poll),
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#endif
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#ifdef __NR_accept
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ALLOW_SYSCALL(accept),
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#endif
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@ -252,6 +273,17 @@ static sock_filter filter[] = {
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ALLOW_SYSCALL(clock_nanosleep_time64), // maybe
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#endif
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// AArch64 (ARM64)
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#if __NR_unlinkat
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ALLOW_SYSCALL(unlinkat),
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#endif
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#ifdef __NR_fstatat64
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ALLOW_SYSCALL(fstatat64),
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#endif
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#ifdef __NR_ppoll
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ALLOW_SYSCALL(ppoll),
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#endif
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KILL_PROCESS
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};
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