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[seccomp] Add support for AArch64

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This is useful for 64-bit Raspberry Pis and other 64-bit ARM systems.
This commit is contained in:
dongresource 2022-07-24 22:40:46 +02:00
parent ca0d608a87
commit 271eef83d3
1 changed files with 33 additions and 1 deletions
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34
src/sandbox/seccomp.cpp
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@ -31,6 +31,8 @@
# define ARCH_NR AUDIT_ARCH_X86_64
#elif defined(__arm__)
# define ARCH_NR AUDIT_ARCH_ARM
#elif defined(__aarch64__)
# define ARCH_NR AUDIT_ARCH_AARCH64
#else
# error "Seccomp-bpf sandbox unsupported on this architecture"
#endif
@ -105,9 +107,18 @@
BPF_STMT(BPF_LD+BPF_W+BPF_ABS, \
offsetof(struct seccomp_data, nr))
/*
* This is a special case for AArch64 where this syscall apparently only
* exists in 32-bit compatibility mode, so we can't include the definition
* even though it gets called somewhere in libc.
*/
#if defined(__aarch64__) && !defined(__NR_fstatat64)
#define __NR_fstatat64 0x4f
#endif
/*
* The main supported configuration is Linux on x86_64 with either glibc or
* musl-libc, with secondary support for Linux on the Raspberry Pi (ARM).
* musl-libc, with secondary support for x86, ARM and ARM64 (AAarch64) Linux.
*
* Syscalls marked with "maybe" don't seem to be used in the default
* configuration, but should probably be whitelisted anyway.
@ -135,16 +146,24 @@ static sock_filter filter[] = {
ALLOW_SYSCALL(brk),
// basic file IO
#ifdef __NR_open
ALLOW_SYSCALL(open),
#endif
ALLOW_SYSCALL(openat),
ALLOW_SYSCALL(read),
ALLOW_SYSCALL(write),
ALLOW_SYSCALL(close),
#if __NR_stat
ALLOW_SYSCALL(stat),
#endif
ALLOW_SYSCALL(fstat),
ALLOW_SYSCALL(fsync), // maybe
#if __NR_creat
ALLOW_SYSCALL(creat), // maybe; for DB journal
#endif
#if __NR_unlink
ALLOW_SYSCALL(unlink), // for DB journal
#endif
ALLOW_SYSCALL(lseek), // musl-libc; alt DB
ALLOW_SYSCALL(truncate), // for truncate-mode DB
ALLOW_SYSCALL(ftruncate), // for truncate-mode DB
@ -183,7 +202,9 @@ static sock_filter filter[] = {
ALLOW_SYSCALL(futex),
// networking
#ifdef __NR_poll
ALLOW_SYSCALL(poll),
#endif
#ifdef __NR_accept
ALLOW_SYSCALL(accept),
#endif
@ -252,6 +273,17 @@ static sock_filter filter[] = {
ALLOW_SYSCALL(clock_nanosleep_time64), // maybe
#endif
// AArch64 (ARM64)
#if __NR_unlinkat
ALLOW_SYSCALL(unlinkat),
#endif
#ifdef __NR_fstatat64
ALLOW_SYSCALL(fstatat64),
#endif
#ifdef __NR_ppoll
ALLOW_SYSCALL(ppoll),
#endif
KILL_PROCESS
};