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libstore: add LocalDerivationGoal setupSyscallFilter hook

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The seccomp setup code was a huge chunk of conditionally compiled
platform-specific code. For this reason, it is appropriate to move it to the
platform-specific implementation file. Ideally its setup could be moved a bit
to make it happen at the same place as the Darwin restrictions, but that change
is going to be less mechanical.

Change-Id: I496aa3c4fabf34656aba1e32b0089044ab5b99f8
This commit is contained in:
alois31 2024-08-06 16:38:32 +02:00
parent f84997cbef
commit 741d3b441c
Signed by untrusted user: alois31
GPG key ID: E0F59EA5E5216914
5 changed files with 612 additions and 601 deletions
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2
maintainers/check-syscalls.sh
View file

@ -2,6 +2,6 @@
set -e
diff -u <(awk < src/libstore/build/local-derivation-goal.cc '/BEGIN extract-syscalls/ { extracting = 1; next }
diff -u <(awk < src/libstore/platform/linux.cc '/BEGIN extract-syscalls/ { extracting = 1; next }
match($0, /allowSyscall\(ctx, SCMP_SYS\(([^)]*)\)\);|\/\/ skip ([^ ]*)/, result) { print result[1] result[2] }
/END extract-syscalls/ { extracting = 0; next }') <(tail -n+2 "$1" | cut -d, -f 1)

601
src/libstore/build/local-derivation-goal.cc
View file

@ -42,11 +42,7 @@
#include <sched.h>
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/syscall.h>
#if HAVE_SECCOMP
#include <seccomp.h>
#endif
#define pivot_root(new_root, put_old) (syscall(SYS_pivot_root, new_root, put_old))
#endif
@ -61,14 +57,6 @@ extern "C" int sandbox_init_with_parameters(const char *profile, uint64_t flags,
namespace nix {
namespace {
/**
* The system for which Nix is compiled.
*/
[[gnu::unused]]
constexpr const std::string_view nativeSystem = SYSTEM;
}
void handleDiffHook(
uid_t uid, uid_t gid,
const Path & tryA, const Path & tryB,
@ -1361,593 +1349,6 @@ void LocalDerivationGoal::chownToBuilder(const Path & path)
throw SysError("cannot change ownership of '%1%'", path);
}
#if HAVE_SECCOMP
static void allowSyscall(scmp_filter_ctx ctx, int syscall) {
if (seccomp_rule_add(ctx, SCMP_ACT_ALLOW, syscall, 0) != 0)
throw SysError("unable to add seccomp rule");
}
#define ALLOW_CHMOD_IF_SAFE(ctx, syscall, modePos) \
if (seccomp_rule_add(ctx, SCMP_ACT_ALLOW, syscall, 1, SCMP_A##modePos(SCMP_CMP_MASKED_EQ, S_ISUID | S_ISGID, 0)) != 0 || \
seccomp_rule_add(ctx, SCMP_ACT_ERRNO(EPERM), syscall, 1, SCMP_A##modePos(SCMP_CMP_MASKED_EQ, S_ISUID, S_ISUID)) != 0 || \
seccomp_rule_add(ctx, SCMP_ACT_ERRNO(EPERM), syscall, 1, SCMP_A##modePos(SCMP_CMP_MASKED_EQ, S_ISGID, S_ISGID)) != 0) \
throw SysError("unable to add seccomp rule");
#endif
void setupSeccomp()
{
#if __linux__
#if HAVE_SECCOMP
scmp_filter_ctx ctx;
// Pretend that syscalls we don't yet know about don't exist.
// This is the best option for compatibility: after all, they did in fact not exist not too long ago.
if (!(ctx = seccomp_init(SCMP_ACT_ERRNO(ENOSYS))))
throw SysError("unable to initialize seccomp mode 2");
Finally cleanup([&]() {
seccomp_release(ctx);
});
if (nativeSystem == "x86_64-linux" &&
seccomp_arch_add(ctx, SCMP_ARCH_X86) != 0)
throw SysError("unable to add 32-bit seccomp architecture");
if (nativeSystem == "x86_64-linux" &&
seccomp_arch_add(ctx, SCMP_ARCH_X32) != 0)
throw SysError("unable to add X32 seccomp architecture");
if (nativeSystem == "aarch64-linux" &&
seccomp_arch_add(ctx, SCMP_ARCH_ARM) != 0)
printError("unable to add ARM seccomp architecture; this may result in spurious build failures if running 32-bit ARM processes");
if (nativeSystem == "mips64-linux" &&
seccomp_arch_add(ctx, SCMP_ARCH_MIPS) != 0)
printError("unable to add mips seccomp architecture");
if (nativeSystem == "mips64-linux" &&
seccomp_arch_add(ctx, SCMP_ARCH_MIPS64N32) != 0)
printError("unable to add mips64-*abin32 seccomp architecture");
if (nativeSystem == "mips64el-linux" &&
seccomp_arch_add(ctx, SCMP_ARCH_MIPSEL) != 0)
printError("unable to add mipsel seccomp architecture");
if (nativeSystem == "mips64el-linux" &&
seccomp_arch_add(ctx, SCMP_ARCH_MIPSEL64N32) != 0)
printError("unable to add mips64el-*abin32 seccomp architecture");
// This list is intended for machine consumption.
// Please keep its format, order and BEGIN/END markers.
//
// Currently, it is up to date with libseccomp 2.5.5 and glibc 2.39.
// Run check-syscalls to determine which new syscalls should be added.
// New syscalls must be audited and handled in a way that blocks the following dangerous operations:
// * Creation of non-empty setuid/setgid files
// * Creation of extended attributes (including ACLs)
//
// BEGIN extract-syscalls
allowSyscall(ctx, SCMP_SYS(accept));
allowSyscall(ctx, SCMP_SYS(accept4));
allowSyscall(ctx, SCMP_SYS(access));
allowSyscall(ctx, SCMP_SYS(acct));
allowSyscall(ctx, SCMP_SYS(add_key));
allowSyscall(ctx, SCMP_SYS(adjtimex));
allowSyscall(ctx, SCMP_SYS(afs_syscall));
allowSyscall(ctx, SCMP_SYS(alarm));
allowSyscall(ctx, SCMP_SYS(arch_prctl));
allowSyscall(ctx, SCMP_SYS(arm_fadvise64_64));
allowSyscall(ctx, SCMP_SYS(arm_sync_file_range));
allowSyscall(ctx, SCMP_SYS(bdflush));
allowSyscall(ctx, SCMP_SYS(bind));
allowSyscall(ctx, SCMP_SYS(bpf));
allowSyscall(ctx, SCMP_SYS(break));
allowSyscall(ctx, SCMP_SYS(breakpoint));
allowSyscall(ctx, SCMP_SYS(brk));
allowSyscall(ctx, SCMP_SYS(cachectl));
allowSyscall(ctx, SCMP_SYS(cacheflush));
allowSyscall(ctx, SCMP_SYS(cachestat));
allowSyscall(ctx, SCMP_SYS(capget));
allowSyscall(ctx, SCMP_SYS(capset));
allowSyscall(ctx, SCMP_SYS(chdir));
// skip chmod (dangerous)
allowSyscall(ctx, SCMP_SYS(chown));
allowSyscall(ctx, SCMP_SYS(chown32));
allowSyscall(ctx, SCMP_SYS(chroot));
allowSyscall(ctx, SCMP_SYS(clock_adjtime));
allowSyscall(ctx, SCMP_SYS(clock_adjtime64));
allowSyscall(ctx, SCMP_SYS(clock_getres));
allowSyscall(ctx, SCMP_SYS(clock_getres_time64));
allowSyscall(ctx, SCMP_SYS(clock_gettime));
allowSyscall(ctx, SCMP_SYS(clock_gettime64));
allowSyscall(ctx, SCMP_SYS(clock_nanosleep));
allowSyscall(ctx, SCMP_SYS(clock_nanosleep_time64));
allowSyscall(ctx, SCMP_SYS(clock_settime));
allowSyscall(ctx, SCMP_SYS(clock_settime64));
allowSyscall(ctx, SCMP_SYS(clone));
allowSyscall(ctx, SCMP_SYS(clone3));
allowSyscall(ctx, SCMP_SYS(close));
allowSyscall(ctx, SCMP_SYS(close_range));
allowSyscall(ctx, SCMP_SYS(connect));
allowSyscall(ctx, SCMP_SYS(copy_file_range));
allowSyscall(ctx, SCMP_SYS(creat));
allowSyscall(ctx, SCMP_SYS(create_module));
allowSyscall(ctx, SCMP_SYS(delete_module));
allowSyscall(ctx, SCMP_SYS(dup));
allowSyscall(ctx, SCMP_SYS(dup2));
allowSyscall(ctx, SCMP_SYS(dup3));
allowSyscall(ctx, SCMP_SYS(epoll_create));
allowSyscall(ctx, SCMP_SYS(epoll_create1));
allowSyscall(ctx, SCMP_SYS(epoll_ctl));
allowSyscall(ctx, SCMP_SYS(epoll_ctl_old));
allowSyscall(ctx, SCMP_SYS(epoll_pwait));
allowSyscall(ctx, SCMP_SYS(epoll_pwait2));
allowSyscall(ctx, SCMP_SYS(epoll_wait));
allowSyscall(ctx, SCMP_SYS(epoll_wait_old));
allowSyscall(ctx, SCMP_SYS(eventfd));
allowSyscall(ctx, SCMP_SYS(eventfd2));
allowSyscall(ctx, SCMP_SYS(execve));
allowSyscall(ctx, SCMP_SYS(execveat));
allowSyscall(ctx, SCMP_SYS(exit));
allowSyscall(ctx, SCMP_SYS(exit_group));
allowSyscall(ctx, SCMP_SYS(faccessat));
allowSyscall(ctx, SCMP_SYS(faccessat2));
allowSyscall(ctx, SCMP_SYS(fadvise64));
allowSyscall(ctx, SCMP_SYS(fadvise64_64));
allowSyscall(ctx, SCMP_SYS(fallocate));
allowSyscall(ctx, SCMP_SYS(fanotify_init));
allowSyscall(ctx, SCMP_SYS(fanotify_mark));
allowSyscall(ctx, SCMP_SYS(fchdir));
// skip fchmod (dangerous)
// skip fchmodat (dangerous)
// skip fchmodat2 (dangerous)
allowSyscall(ctx, SCMP_SYS(fchown));
allowSyscall(ctx, SCMP_SYS(fchown32));
allowSyscall(ctx, SCMP_SYS(fchownat));
allowSyscall(ctx, SCMP_SYS(fcntl));
allowSyscall(ctx, SCMP_SYS(fcntl64));
allowSyscall(ctx, SCMP_SYS(fdatasync));
allowSyscall(ctx, SCMP_SYS(fgetxattr));
allowSyscall(ctx, SCMP_SYS(finit_module));
allowSyscall(ctx, SCMP_SYS(flistxattr));
allowSyscall(ctx, SCMP_SYS(flock));
allowSyscall(ctx, SCMP_SYS(fork));
allowSyscall(ctx, SCMP_SYS(fremovexattr));
allowSyscall(ctx, SCMP_SYS(fsconfig));
// skip fsetxattr (dangerous)
allowSyscall(ctx, SCMP_SYS(fsmount));
allowSyscall(ctx, SCMP_SYS(fsopen));
allowSyscall(ctx, SCMP_SYS(fspick));
allowSyscall(ctx, SCMP_SYS(fstat));
allowSyscall(ctx, SCMP_SYS(fstat64));
allowSyscall(ctx, SCMP_SYS(fstatat64));
allowSyscall(ctx, SCMP_SYS(fstatfs));
allowSyscall(ctx, SCMP_SYS(fstatfs64));
allowSyscall(ctx, SCMP_SYS(fsync));
allowSyscall(ctx, SCMP_SYS(ftime));
allowSyscall(ctx, SCMP_SYS(ftruncate));
allowSyscall(ctx, SCMP_SYS(ftruncate64));
allowSyscall(ctx, SCMP_SYS(futex));
allowSyscall(ctx, SCMP_SYS(futex_requeue));
allowSyscall(ctx, SCMP_SYS(futex_time64));
allowSyscall(ctx, SCMP_SYS(futex_wait));
allowSyscall(ctx, SCMP_SYS(futex_waitv));
allowSyscall(ctx, SCMP_SYS(futex_wake));
allowSyscall(ctx, SCMP_SYS(futimesat));
allowSyscall(ctx, SCMP_SYS(getcpu));
allowSyscall(ctx, SCMP_SYS(getcwd));
allowSyscall(ctx, SCMP_SYS(getdents));
allowSyscall(ctx, SCMP_SYS(getdents64));
allowSyscall(ctx, SCMP_SYS(getegid));
allowSyscall(ctx, SCMP_SYS(getegid32));
allowSyscall(ctx, SCMP_SYS(geteuid));
allowSyscall(ctx, SCMP_SYS(geteuid32));
allowSyscall(ctx, SCMP_SYS(getgid));
allowSyscall(ctx, SCMP_SYS(getgid32));
allowSyscall(ctx, SCMP_SYS(getgroups));
allowSyscall(ctx, SCMP_SYS(getgroups32));
allowSyscall(ctx, SCMP_SYS(getitimer));
allowSyscall(ctx, SCMP_SYS(get_kernel_syms));
allowSyscall(ctx, SCMP_SYS(get_mempolicy));
allowSyscall(ctx, SCMP_SYS(getpeername));
allowSyscall(ctx, SCMP_SYS(getpgid));
allowSyscall(ctx, SCMP_SYS(getpgrp));
allowSyscall(ctx, SCMP_SYS(getpid));
allowSyscall(ctx, SCMP_SYS(getpmsg));
allowSyscall(ctx, SCMP_SYS(getppid));
allowSyscall(ctx, SCMP_SYS(getpriority));
allowSyscall(ctx, SCMP_SYS(getrandom));
allowSyscall(ctx, SCMP_SYS(getresgid));
allowSyscall(ctx, SCMP_SYS(getresgid32));
allowSyscall(ctx, SCMP_SYS(getresuid));
allowSyscall(ctx, SCMP_SYS(getresuid32));
allowSyscall(ctx, SCMP_SYS(getrlimit));
allowSyscall(ctx, SCMP_SYS(get_robust_list));
allowSyscall(ctx, SCMP_SYS(getrusage));
allowSyscall(ctx, SCMP_SYS(getsid));
allowSyscall(ctx, SCMP_SYS(getsockname));
allowSyscall(ctx, SCMP_SYS(getsockopt));
allowSyscall(ctx, SCMP_SYS(get_thread_area));
allowSyscall(ctx, SCMP_SYS(gettid));
allowSyscall(ctx, SCMP_SYS(gettimeofday));
allowSyscall(ctx, SCMP_SYS(get_tls));
allowSyscall(ctx, SCMP_SYS(getuid));
allowSyscall(ctx, SCMP_SYS(getuid32));
allowSyscall(ctx, SCMP_SYS(getxattr));
allowSyscall(ctx, SCMP_SYS(gtty));
allowSyscall(ctx, SCMP_SYS(idle));
allowSyscall(ctx, SCMP_SYS(init_module));
allowSyscall(ctx, SCMP_SYS(inotify_add_watch));
allowSyscall(ctx, SCMP_SYS(inotify_init));
allowSyscall(ctx, SCMP_SYS(inotify_init1));
allowSyscall(ctx, SCMP_SYS(inotify_rm_watch));
allowSyscall(ctx, SCMP_SYS(io_cancel));
allowSyscall(ctx, SCMP_SYS(ioctl));
allowSyscall(ctx, SCMP_SYS(io_destroy));
allowSyscall(ctx, SCMP_SYS(io_getevents));
allowSyscall(ctx, SCMP_SYS(ioperm));
allowSyscall(ctx, SCMP_SYS(io_pgetevents));
allowSyscall(ctx, SCMP_SYS(io_pgetevents_time64));
allowSyscall(ctx, SCMP_SYS(iopl));
allowSyscall(ctx, SCMP_SYS(ioprio_get));
allowSyscall(ctx, SCMP_SYS(ioprio_set));
allowSyscall(ctx, SCMP_SYS(io_setup));
allowSyscall(ctx, SCMP_SYS(io_submit));
// skip io_uring_enter (may become dangerous)
// skip io_uring_register (may become dangerous)
// skip io_uring_setup (may become dangerous)
allowSyscall(ctx, SCMP_SYS(ipc));
allowSyscall(ctx, SCMP_SYS(kcmp));
allowSyscall(ctx, SCMP_SYS(kexec_file_load));
allowSyscall(ctx, SCMP_SYS(kexec_load));
allowSyscall(ctx, SCMP_SYS(keyctl));
allowSyscall(ctx, SCMP_SYS(kill));
allowSyscall(ctx, SCMP_SYS(landlock_add_rule));
allowSyscall(ctx, SCMP_SYS(landlock_create_ruleset));
allowSyscall(ctx, SCMP_SYS(landlock_restrict_self));
allowSyscall(ctx, SCMP_SYS(lchown));
allowSyscall(ctx, SCMP_SYS(lchown32));
allowSyscall(ctx, SCMP_SYS(lgetxattr));
allowSyscall(ctx, SCMP_SYS(link));
allowSyscall(ctx, SCMP_SYS(linkat));
allowSyscall(ctx, SCMP_SYS(listen));
allowSyscall(ctx, SCMP_SYS(listxattr));
allowSyscall(ctx, SCMP_SYS(llistxattr));
allowSyscall(ctx, SCMP_SYS(_llseek));
allowSyscall(ctx, SCMP_SYS(lock));
allowSyscall(ctx, SCMP_SYS(lookup_dcookie));
allowSyscall(ctx, SCMP_SYS(lremovexattr));
allowSyscall(ctx, SCMP_SYS(lseek));
// skip lsetxattr (dangerous)
allowSyscall(ctx, SCMP_SYS(lstat));
allowSyscall(ctx, SCMP_SYS(lstat64));
allowSyscall(ctx, SCMP_SYS(madvise));
allowSyscall(ctx, SCMP_SYS(map_shadow_stack));
allowSyscall(ctx, SCMP_SYS(mbind));
allowSyscall(ctx, SCMP_SYS(membarrier));
allowSyscall(ctx, SCMP_SYS(memfd_create));
allowSyscall(ctx, SCMP_SYS(memfd_secret));
allowSyscall(ctx, SCMP_SYS(migrate_pages));
allowSyscall(ctx, SCMP_SYS(mincore));
allowSyscall(ctx, SCMP_SYS(mkdir));
allowSyscall(ctx, SCMP_SYS(mkdirat));
allowSyscall(ctx, SCMP_SYS(mknod));
allowSyscall(ctx, SCMP_SYS(mknodat));
allowSyscall(ctx, SCMP_SYS(mlock));
allowSyscall(ctx, SCMP_SYS(mlock2));
allowSyscall(ctx, SCMP_SYS(mlockall));
allowSyscall(ctx, SCMP_SYS(mmap));
allowSyscall(ctx, SCMP_SYS(mmap2));
allowSyscall(ctx, SCMP_SYS(modify_ldt));
allowSyscall(ctx, SCMP_SYS(mount));
allowSyscall(ctx, SCMP_SYS(mount_setattr));
allowSyscall(ctx, SCMP_SYS(move_mount));
allowSyscall(ctx, SCMP_SYS(move_pages));
allowSyscall(ctx, SCMP_SYS(mprotect));
allowSyscall(ctx, SCMP_SYS(mpx));
allowSyscall(ctx, SCMP_SYS(mq_getsetattr));
allowSyscall(ctx, SCMP_SYS(mq_notify));
allowSyscall(ctx, SCMP_SYS(mq_open));
allowSyscall(ctx, SCMP_SYS(mq_timedreceive));
allowSyscall(ctx, SCMP_SYS(mq_timedreceive_time64));
allowSyscall(ctx, SCMP_SYS(mq_timedsend));
allowSyscall(ctx, SCMP_SYS(mq_timedsend_time64));
allowSyscall(ctx, SCMP_SYS(mq_unlink));
allowSyscall(ctx, SCMP_SYS(mremap));
allowSyscall(ctx, SCMP_SYS(msgctl));
allowSyscall(ctx, SCMP_SYS(msgget));
allowSyscall(ctx, SCMP_SYS(msgrcv));
allowSyscall(ctx, SCMP_SYS(msgsnd));
allowSyscall(ctx, SCMP_SYS(msync));
allowSyscall(ctx, SCMP_SYS(multiplexer));
allowSyscall(ctx, SCMP_SYS(munlock));
allowSyscall(ctx, SCMP_SYS(munlockall));
allowSyscall(ctx, SCMP_SYS(munmap));
allowSyscall(ctx, SCMP_SYS(name_to_handle_at));
allowSyscall(ctx, SCMP_SYS(nanosleep));
allowSyscall(ctx, SCMP_SYS(newfstatat));
allowSyscall(ctx, SCMP_SYS(_newselect));
allowSyscall(ctx, SCMP_SYS(nfsservctl));
allowSyscall(ctx, SCMP_SYS(nice));
allowSyscall(ctx, SCMP_SYS(oldfstat));
allowSyscall(ctx, SCMP_SYS(oldlstat));
allowSyscall(ctx, SCMP_SYS(oldolduname));
allowSyscall(ctx, SCMP_SYS(oldstat));
allowSyscall(ctx, SCMP_SYS(olduname));
allowSyscall(ctx, SCMP_SYS(open));
allowSyscall(ctx, SCMP_SYS(openat));
allowSyscall(ctx, SCMP_SYS(openat2));
allowSyscall(ctx, SCMP_SYS(open_by_handle_at));
allowSyscall(ctx, SCMP_SYS(open_tree));
allowSyscall(ctx, SCMP_SYS(pause));
allowSyscall(ctx, SCMP_SYS(pciconfig_iobase));
allowSyscall(ctx, SCMP_SYS(pciconfig_read));
allowSyscall(ctx, SCMP_SYS(pciconfig_write));
allowSyscall(ctx, SCMP_SYS(perf_event_open));
allowSyscall(ctx, SCMP_SYS(personality));
allowSyscall(ctx, SCMP_SYS(pidfd_getfd));
allowSyscall(ctx, SCMP_SYS(pidfd_open));
allowSyscall(ctx, SCMP_SYS(pidfd_send_signal));
allowSyscall(ctx, SCMP_SYS(pipe));
allowSyscall(ctx, SCMP_SYS(pipe2));
allowSyscall(ctx, SCMP_SYS(pivot_root));
allowSyscall(ctx, SCMP_SYS(pkey_alloc));
allowSyscall(ctx, SCMP_SYS(pkey_free));
allowSyscall(ctx, SCMP_SYS(pkey_mprotect));
allowSyscall(ctx, SCMP_SYS(poll));
allowSyscall(ctx, SCMP_SYS(ppoll));
allowSyscall(ctx, SCMP_SYS(ppoll_time64));
allowSyscall(ctx, SCMP_SYS(prctl));
allowSyscall(ctx, SCMP_SYS(pread64));
allowSyscall(ctx, SCMP_SYS(preadv));
allowSyscall(ctx, SCMP_SYS(preadv2));
allowSyscall(ctx, SCMP_SYS(prlimit64));
allowSyscall(ctx, SCMP_SYS(process_madvise));
allowSyscall(ctx, SCMP_SYS(process_mrelease));
allowSyscall(ctx, SCMP_SYS(process_vm_readv));
allowSyscall(ctx, SCMP_SYS(process_vm_writev));
allowSyscall(ctx, SCMP_SYS(prof));
allowSyscall(ctx, SCMP_SYS(profil));
allowSyscall(ctx, SCMP_SYS(pselect6));
allowSyscall(ctx, SCMP_SYS(pselect6_time64));
allowSyscall(ctx, SCMP_SYS(ptrace));
allowSyscall(ctx, SCMP_SYS(putpmsg));
allowSyscall(ctx, SCMP_SYS(pwrite64));
allowSyscall(ctx, SCMP_SYS(pwritev));
allowSyscall(ctx, SCMP_SYS(pwritev2));
allowSyscall(ctx, SCMP_SYS(query_module));
allowSyscall(ctx, SCMP_SYS(quotactl));
allowSyscall(ctx, SCMP_SYS(quotactl_fd));
allowSyscall(ctx, SCMP_SYS(read));
allowSyscall(ctx, SCMP_SYS(readahead));
allowSyscall(ctx, SCMP_SYS(readdir));
allowSyscall(ctx, SCMP_SYS(readlink));
allowSyscall(ctx, SCMP_SYS(readlinkat));
allowSyscall(ctx, SCMP_SYS(readv));
allowSyscall(ctx, SCMP_SYS(reboot));
allowSyscall(ctx, SCMP_SYS(recv));
allowSyscall(ctx, SCMP_SYS(recvfrom));
allowSyscall(ctx, SCMP_SYS(recvmmsg));
allowSyscall(ctx, SCMP_SYS(recvmmsg_time64));
allowSyscall(ctx, SCMP_SYS(recvmsg));
allowSyscall(ctx, SCMP_SYS(remap_file_pages));
allowSyscall(ctx, SCMP_SYS(removexattr));
allowSyscall(ctx, SCMP_SYS(rename));
allowSyscall(ctx, SCMP_SYS(renameat));
allowSyscall(ctx, SCMP_SYS(renameat2));
allowSyscall(ctx, SCMP_SYS(request_key));
allowSyscall(ctx, SCMP_SYS(restart_syscall));
allowSyscall(ctx, SCMP_SYS(riscv_flush_icache));
allowSyscall(ctx, SCMP_SYS(rmdir));
allowSyscall(ctx, SCMP_SYS(rseq));
allowSyscall(ctx, SCMP_SYS(rtas));
allowSyscall(ctx, SCMP_SYS(rt_sigaction));
allowSyscall(ctx, SCMP_SYS(rt_sigpending));
allowSyscall(ctx, SCMP_SYS(rt_sigprocmask));
allowSyscall(ctx, SCMP_SYS(rt_sigqueueinfo));
allowSyscall(ctx, SCMP_SYS(rt_sigreturn));
allowSyscall(ctx, SCMP_SYS(rt_sigsuspend));
allowSyscall(ctx, SCMP_SYS(rt_sigtimedwait));
allowSyscall(ctx, SCMP_SYS(rt_sigtimedwait_time64));
allowSyscall(ctx, SCMP_SYS(rt_tgsigqueueinfo));
allowSyscall(ctx, SCMP_SYS(s390_guarded_storage));
allowSyscall(ctx, SCMP_SYS(s390_pci_mmio_read));
allowSyscall(ctx, SCMP_SYS(s390_pci_mmio_write));
allowSyscall(ctx, SCMP_SYS(s390_runtime_instr));
allowSyscall(ctx, SCMP_SYS(s390_sthyi));
allowSyscall(ctx, SCMP_SYS(sched_getaffinity));
allowSyscall(ctx, SCMP_SYS(sched_getattr));
allowSyscall(ctx, SCMP_SYS(sched_getparam));
allowSyscall(ctx, SCMP_SYS(sched_get_priority_max));
allowSyscall(ctx, SCMP_SYS(sched_get_priority_min));
allowSyscall(ctx, SCMP_SYS(sched_getscheduler));
allowSyscall(ctx, SCMP_SYS(sched_rr_get_interval));
allowSyscall(ctx, SCMP_SYS(sched_rr_get_interval_time64));
allowSyscall(ctx, SCMP_SYS(sched_setaffinity));
allowSyscall(ctx, SCMP_SYS(sched_setattr));
allowSyscall(ctx, SCMP_SYS(sched_setparam));
allowSyscall(ctx, SCMP_SYS(sched_setscheduler));
allowSyscall(ctx, SCMP_SYS(sched_yield));
allowSyscall(ctx, SCMP_SYS(seccomp));
allowSyscall(ctx, SCMP_SYS(security));
allowSyscall(ctx, SCMP_SYS(select));
allowSyscall(ctx, SCMP_SYS(semctl));
allowSyscall(ctx, SCMP_SYS(semget));
allowSyscall(ctx, SCMP_SYS(semop));
allowSyscall(ctx, SCMP_SYS(semtimedop));
allowSyscall(ctx, SCMP_SYS(semtimedop_time64));
allowSyscall(ctx, SCMP_SYS(send));
allowSyscall(ctx, SCMP_SYS(sendfile));
allowSyscall(ctx, SCMP_SYS(sendfile64));
allowSyscall(ctx, SCMP_SYS(sendmmsg));
allowSyscall(ctx, SCMP_SYS(sendmsg));
allowSyscall(ctx, SCMP_SYS(sendto));
allowSyscall(ctx, SCMP_SYS(setdomainname));
allowSyscall(ctx, SCMP_SYS(setfsgid));
allowSyscall(ctx, SCMP_SYS(setfsgid32));
allowSyscall(ctx, SCMP_SYS(setfsuid));
allowSyscall(ctx, SCMP_SYS(setfsuid32));
allowSyscall(ctx, SCMP_SYS(setgid));
allowSyscall(ctx, SCMP_SYS(setgid32));
allowSyscall(ctx, SCMP_SYS(setgroups));
allowSyscall(ctx, SCMP_SYS(setgroups32));
allowSyscall(ctx, SCMP_SYS(sethostname));
allowSyscall(ctx, SCMP_SYS(setitimer));
allowSyscall(ctx, SCMP_SYS(set_mempolicy));
allowSyscall(ctx, SCMP_SYS(set_mempolicy_home_node));
allowSyscall(ctx, SCMP_SYS(setns));
allowSyscall(ctx, SCMP_SYS(setpgid));
allowSyscall(ctx, SCMP_SYS(setpriority));
allowSyscall(ctx, SCMP_SYS(setregid));
allowSyscall(ctx, SCMP_SYS(setregid32));
allowSyscall(ctx, SCMP_SYS(setresgid));
allowSyscall(ctx, SCMP_SYS(setresgid32));
allowSyscall(ctx, SCMP_SYS(setresuid));
allowSyscall(ctx, SCMP_SYS(setresuid32));
allowSyscall(ctx, SCMP_SYS(setreuid));
allowSyscall(ctx, SCMP_SYS(setreuid32));
allowSyscall(ctx, SCMP_SYS(setrlimit));
allowSyscall(ctx, SCMP_SYS(set_robust_list));
allowSyscall(ctx, SCMP_SYS(setsid));
allowSyscall(ctx, SCMP_SYS(setsockopt));
allowSyscall(ctx, SCMP_SYS(set_thread_area));
allowSyscall(ctx, SCMP_SYS(set_tid_address));
allowSyscall(ctx, SCMP_SYS(settimeofday));
allowSyscall(ctx, SCMP_SYS(set_tls));
allowSyscall(ctx, SCMP_SYS(setuid));
allowSyscall(ctx, SCMP_SYS(setuid32));
// skip setxattr (dangerous)
allowSyscall(ctx, SCMP_SYS(sgetmask));
allowSyscall(ctx, SCMP_SYS(shmat));
allowSyscall(ctx, SCMP_SYS(shmctl));
allowSyscall(ctx, SCMP_SYS(shmdt));
allowSyscall(ctx, SCMP_SYS(shmget));
allowSyscall(ctx, SCMP_SYS(shutdown));
allowSyscall(ctx, SCMP_SYS(sigaction));
allowSyscall(ctx, SCMP_SYS(sigaltstack));
allowSyscall(ctx, SCMP_SYS(signal));
allowSyscall(ctx, SCMP_SYS(signalfd));
allowSyscall(ctx, SCMP_SYS(signalfd4));
allowSyscall(ctx, SCMP_SYS(sigpending));
allowSyscall(ctx, SCMP_SYS(sigprocmask));
allowSyscall(ctx, SCMP_SYS(sigreturn));
allowSyscall(ctx, SCMP_SYS(sigsuspend));
allowSyscall(ctx, SCMP_SYS(socket));
allowSyscall(ctx, SCMP_SYS(socketcall));
allowSyscall(ctx, SCMP_SYS(socketpair));
allowSyscall(ctx, SCMP_SYS(splice));
allowSyscall(ctx, SCMP_SYS(spu_create));
allowSyscall(ctx, SCMP_SYS(spu_run));
allowSyscall(ctx, SCMP_SYS(ssetmask));
allowSyscall(ctx, SCMP_SYS(stat));
allowSyscall(ctx, SCMP_SYS(stat64));
allowSyscall(ctx, SCMP_SYS(statfs));
allowSyscall(ctx, SCMP_SYS(statfs64));
allowSyscall(ctx, SCMP_SYS(statx));
allowSyscall(ctx, SCMP_SYS(stime));
allowSyscall(ctx, SCMP_SYS(stty));
allowSyscall(ctx, SCMP_SYS(subpage_prot));
allowSyscall(ctx, SCMP_SYS(swapcontext));
allowSyscall(ctx, SCMP_SYS(swapoff));
allowSyscall(ctx, SCMP_SYS(swapon));
allowSyscall(ctx, SCMP_SYS(switch_endian));
allowSyscall(ctx, SCMP_SYS(symlink));
allowSyscall(ctx, SCMP_SYS(symlinkat));
allowSyscall(ctx, SCMP_SYS(sync));
allowSyscall(ctx, SCMP_SYS(sync_file_range));
allowSyscall(ctx, SCMP_SYS(sync_file_range2));
allowSyscall(ctx, SCMP_SYS(syncfs));
allowSyscall(ctx, SCMP_SYS(syscall));
allowSyscall(ctx, SCMP_SYS(_sysctl));
allowSyscall(ctx, SCMP_SYS(sys_debug_setcontext));
allowSyscall(ctx, SCMP_SYS(sysfs));
allowSyscall(ctx, SCMP_SYS(sysinfo));
allowSyscall(ctx, SCMP_SYS(syslog));
allowSyscall(ctx, SCMP_SYS(sysmips));
allowSyscall(ctx, SCMP_SYS(tee));
allowSyscall(ctx, SCMP_SYS(tgkill));
allowSyscall(ctx, SCMP_SYS(time));
allowSyscall(ctx, SCMP_SYS(timer_create));
allowSyscall(ctx, SCMP_SYS(timer_delete));
allowSyscall(ctx, SCMP_SYS(timerfd));
allowSyscall(ctx, SCMP_SYS(timerfd_create));
allowSyscall(ctx, SCMP_SYS(timerfd_gettime));
allowSyscall(ctx, SCMP_SYS(timerfd_gettime64));
allowSyscall(ctx, SCMP_SYS(timerfd_settime));
allowSyscall(ctx, SCMP_SYS(timerfd_settime64));
allowSyscall(ctx, SCMP_SYS(timer_getoverrun));
allowSyscall(ctx, SCMP_SYS(timer_gettime));
allowSyscall(ctx, SCMP_SYS(timer_gettime64));
allowSyscall(ctx, SCMP_SYS(timer_settime));
allowSyscall(ctx, SCMP_SYS(timer_settime64));
allowSyscall(ctx, SCMP_SYS(times));
allowSyscall(ctx, SCMP_SYS(tkill));
allowSyscall(ctx, SCMP_SYS(truncate));
allowSyscall(ctx, SCMP_SYS(truncate64));
allowSyscall(ctx, SCMP_SYS(tuxcall));
allowSyscall(ctx, SCMP_SYS(ugetrlimit));
allowSyscall(ctx, SCMP_SYS(ulimit));
allowSyscall(ctx, SCMP_SYS(umask));
allowSyscall(ctx, SCMP_SYS(umount));
allowSyscall(ctx, SCMP_SYS(umount2));
allowSyscall(ctx, SCMP_SYS(uname));
allowSyscall(ctx, SCMP_SYS(unlink));
allowSyscall(ctx, SCMP_SYS(unlinkat));
allowSyscall(ctx, SCMP_SYS(unshare));
allowSyscall(ctx, SCMP_SYS(uselib));
allowSyscall(ctx, SCMP_SYS(userfaultfd));
allowSyscall(ctx, SCMP_SYS(usr26));
allowSyscall(ctx, SCMP_SYS(usr32));
allowSyscall(ctx, SCMP_SYS(ustat));
allowSyscall(ctx, SCMP_SYS(utime));
allowSyscall(ctx, SCMP_SYS(utimensat));
allowSyscall(ctx, SCMP_SYS(utimensat_time64));
allowSyscall(ctx, SCMP_SYS(utimes));
allowSyscall(ctx, SCMP_SYS(vfork));
allowSyscall(ctx, SCMP_SYS(vhangup));
allowSyscall(ctx, SCMP_SYS(vm86));
allowSyscall(ctx, SCMP_SYS(vm86old));
allowSyscall(ctx, SCMP_SYS(vmsplice));
allowSyscall(ctx, SCMP_SYS(vserver));
allowSyscall(ctx, SCMP_SYS(wait4));
allowSyscall(ctx, SCMP_SYS(waitid));
allowSyscall(ctx, SCMP_SYS(waitpid));
allowSyscall(ctx, SCMP_SYS(write));
allowSyscall(ctx, SCMP_SYS(writev));
// END extract-syscalls
// chmod family: prevent adding setuid/setgid bits to existing files.
// The Nix store does not support setuid/setgid, and even their temporary creation can weaken the security of the sandbox.
ALLOW_CHMOD_IF_SAFE(ctx, SCMP_SYS(chmod), 1);
ALLOW_CHMOD_IF_SAFE(ctx, SCMP_SYS(fchmod), 1);
ALLOW_CHMOD_IF_SAFE(ctx, SCMP_SYS(fchmodat), 2);
ALLOW_CHMOD_IF_SAFE(ctx, SCMP_SYS(fchmodat2), 2);
// setxattr family: prevent creation of extended attributes or ACLs.
// Not all filesystems support them, and they're incompatible with the NAR format.
if (seccomp_rule_add(ctx, SCMP_ACT_ERRNO(ENOTSUP), SCMP_SYS(setxattr), 0) != 0 ||
seccomp_rule_add(ctx, SCMP_ACT_ERRNO(ENOTSUP), SCMP_SYS(lsetxattr), 0) != 0 ||
seccomp_rule_add(ctx, SCMP_ACT_ERRNO(ENOTSUP), SCMP_SYS(fsetxattr), 0) != 0)
throw SysError("unable to add seccomp rule");
// Set the NO_NEW_PRIVS prctl flag.
// This both makes loading seccomp filters work for unprivileged users,
// and is an additional security measure in its own right.
if (seccomp_attr_set(ctx, SCMP_FLTATR_CTL_NNP, 1) != 0)
throw SysError("unable to set 'no new privileges' seccomp attribute");
if (seccomp_load(ctx) != 0)
throw SysError("unable to load seccomp BPF program");
#else
// Still set the no-new-privileges flag if libseccomp is not available.
if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) == -1)
throw SysError("PR_SET_NO_NEW_PRIVS failed");
#endif
#endif
}
void LocalDerivationGoal::runChild()
{
@ -1960,7 +1361,7 @@ void LocalDerivationGoal::runChild()
commonChildInit();
setupSeccomp();
setupSyscallFilter();
bool setUser = true;

6
src/libstore/build/local-derivation-goal.hh
View file

@ -339,6 +339,12 @@ protected:
*/
virtual Pid startChild(std::function<void()> openSlave);
/**
* Set up the system call filtering required for the sandbox.
* This currently only has an effect on Linux.
*/
virtual void setupSyscallFilter() {}
/**
* Execute the builder, replacing the current process.
* Generally this means an `execve` call.

599
src/libstore/platform/linux.cc
View file

@ -8,8 +8,22 @@
#include <grp.h>
#include <regex>
#include <sys/prctl.h>
#if HAVE_SECCOMP
#include <seccomp.h>
#endif
namespace nix {
namespace {
/**
* The system for which Nix is compiled.
*/
[[gnu::unused]]
constexpr const std::string_view nativeSystem = SYSTEM;
}
static RegisterStoreImplementation<LinuxLocalStore, LocalStoreConfig> regLocalStore;
static void readProcLink(const std::string & file, UncheckedRoots & roots)
@ -119,6 +133,591 @@ void LinuxLocalStore::findPlatformRoots(UncheckedRoots & unchecked)
readFileRoots("/proc/sys/kernel/poweroff_cmd", unchecked);
}
#if HAVE_SECCOMP
static void allowSyscall(scmp_filter_ctx ctx, int syscall) {
if (seccomp_rule_add(ctx, SCMP_ACT_ALLOW, syscall, 0) != 0)
throw SysError("unable to add seccomp rule");
}
#define ALLOW_CHMOD_IF_SAFE(ctx, syscall, modePos) \
if (seccomp_rule_add(ctx, SCMP_ACT_ALLOW, syscall, 1, SCMP_A##modePos(SCMP_CMP_MASKED_EQ, S_ISUID | S_ISGID, 0)) != 0 || \
seccomp_rule_add(ctx, SCMP_ACT_ERRNO(EPERM), syscall, 1, SCMP_A##modePos(SCMP_CMP_MASKED_EQ, S_ISUID, S_ISUID)) != 0 || \
seccomp_rule_add(ctx, SCMP_ACT_ERRNO(EPERM), syscall, 1, SCMP_A##modePos(SCMP_CMP_MASKED_EQ, S_ISGID, S_ISGID)) != 0) \
throw SysError("unable to add seccomp rule");
#endif
void LinuxLocalDerivationGoal::setupSyscallFilter()
{
#if HAVE_SECCOMP
scmp_filter_ctx ctx;
// Pretend that syscalls we don't yet know about don't exist.
// This is the best option for compatibility: after all, they did in fact not exist not too long ago.
if (!(ctx = seccomp_init(SCMP_ACT_ERRNO(ENOSYS))))
throw SysError("unable to initialize seccomp mode 2");
Finally cleanup([&]() {
seccomp_release(ctx);
});
if (nativeSystem == "x86_64-linux" &&
seccomp_arch_add(ctx, SCMP_ARCH_X86) != 0)
throw SysError("unable to add 32-bit seccomp architecture");
if (nativeSystem == "x86_64-linux" &&
seccomp_arch_add(ctx, SCMP_ARCH_X32) != 0)
throw SysError("unable to add X32 seccomp architecture");
if (nativeSystem == "aarch64-linux" &&
seccomp_arch_add(ctx, SCMP_ARCH_ARM) != 0)
printError("unable to add ARM seccomp architecture; this may result in spurious build failures if running 32-bit ARM processes");
if (nativeSystem == "mips64-linux" &&
seccomp_arch_add(ctx, SCMP_ARCH_MIPS) != 0)
printError("unable to add mips seccomp architecture");
if (nativeSystem == "mips64-linux" &&
seccomp_arch_add(ctx, SCMP_ARCH_MIPS64N32) != 0)
printError("unable to add mips64-*abin32 seccomp architecture");
if (nativeSystem == "mips64el-linux" &&
seccomp_arch_add(ctx, SCMP_ARCH_MIPSEL) != 0)
printError("unable to add mipsel seccomp architecture");
if (nativeSystem == "mips64el-linux" &&
seccomp_arch_add(ctx, SCMP_ARCH_MIPSEL64N32) != 0)
printError("unable to add mips64el-*abin32 seccomp architecture");
// This list is intended for machine consumption.
// Please keep its format, order and BEGIN/END markers.
//
// Currently, it is up to date with libseccomp 2.5.5 and glibc 2.39.
// Run check-syscalls to determine which new syscalls should be added.
// New syscalls must be audited and handled in a way that blocks the following dangerous operations:
// * Creation of non-empty setuid/setgid files
// * Creation of extended attributes (including ACLs)
//
// BEGIN extract-syscalls
allowSyscall(ctx, SCMP_SYS(accept));
allowSyscall(ctx, SCMP_SYS(accept4));
allowSyscall(ctx, SCMP_SYS(access));
allowSyscall(ctx, SCMP_SYS(acct));
allowSyscall(ctx, SCMP_SYS(add_key));
allowSyscall(ctx, SCMP_SYS(adjtimex));
allowSyscall(ctx, SCMP_SYS(afs_syscall));
allowSyscall(ctx, SCMP_SYS(alarm));
allowSyscall(ctx, SCMP_SYS(arch_prctl));
allowSyscall(ctx, SCMP_SYS(arm_fadvise64_64));
allowSyscall(ctx, SCMP_SYS(arm_sync_file_range));
allowSyscall(ctx, SCMP_SYS(bdflush));
allowSyscall(ctx, SCMP_SYS(bind));
allowSyscall(ctx, SCMP_SYS(bpf));
allowSyscall(ctx, SCMP_SYS(break));
allowSyscall(ctx, SCMP_SYS(breakpoint));
allowSyscall(ctx, SCMP_SYS(brk));
allowSyscall(ctx, SCMP_SYS(cachectl));
allowSyscall(ctx, SCMP_SYS(cacheflush));
allowSyscall(ctx, SCMP_SYS(cachestat));
allowSyscall(ctx, SCMP_SYS(capget));
allowSyscall(ctx, SCMP_SYS(capset));
allowSyscall(ctx, SCMP_SYS(chdir));
// skip chmod (dangerous)
allowSyscall(ctx, SCMP_SYS(chown));
allowSyscall(ctx, SCMP_SYS(chown32));
allowSyscall(ctx, SCMP_SYS(chroot));
allowSyscall(ctx, SCMP_SYS(clock_adjtime));
allowSyscall(ctx, SCMP_SYS(clock_adjtime64));
allowSyscall(ctx, SCMP_SYS(clock_getres));
allowSyscall(ctx, SCMP_SYS(clock_getres_time64));
allowSyscall(ctx, SCMP_SYS(clock_gettime));
allowSyscall(ctx, SCMP_SYS(clock_gettime64));
allowSyscall(ctx, SCMP_SYS(clock_nanosleep));
allowSyscall(ctx, SCMP_SYS(clock_nanosleep_time64));
allowSyscall(ctx, SCMP_SYS(clock_settime));
allowSyscall(ctx, SCMP_SYS(clock_settime64));
allowSyscall(ctx, SCMP_SYS(clone));
allowSyscall(ctx, SCMP_SYS(clone3));
allowSyscall(ctx, SCMP_SYS(close));
allowSyscall(ctx, SCMP_SYS(close_range));
allowSyscall(ctx, SCMP_SYS(connect));
allowSyscall(ctx, SCMP_SYS(copy_file_range));
allowSyscall(ctx, SCMP_SYS(creat));
allowSyscall(ctx, SCMP_SYS(create_module));
allowSyscall(ctx, SCMP_SYS(delete_module));
allowSyscall(ctx, SCMP_SYS(dup));
allowSyscall(ctx, SCMP_SYS(dup2));
allowSyscall(ctx, SCMP_SYS(dup3));
allowSyscall(ctx, SCMP_SYS(epoll_create));
allowSyscall(ctx, SCMP_SYS(epoll_create1));
allowSyscall(ctx, SCMP_SYS(epoll_ctl));
allowSyscall(ctx, SCMP_SYS(epoll_ctl_old));
allowSyscall(ctx, SCMP_SYS(epoll_pwait));
allowSyscall(ctx, SCMP_SYS(epoll_pwait2));
allowSyscall(ctx, SCMP_SYS(epoll_wait));
allowSyscall(ctx, SCMP_SYS(epoll_wait_old));
allowSyscall(ctx, SCMP_SYS(eventfd));
allowSyscall(ctx, SCMP_SYS(eventfd2));
allowSyscall(ctx, SCMP_SYS(execve));
allowSyscall(ctx, SCMP_SYS(execveat));
allowSyscall(ctx, SCMP_SYS(exit));
allowSyscall(ctx, SCMP_SYS(exit_group));
allowSyscall(ctx, SCMP_SYS(faccessat));
allowSyscall(ctx, SCMP_SYS(faccessat2));
allowSyscall(ctx, SCMP_SYS(fadvise64));
allowSyscall(ctx, SCMP_SYS(fadvise64_64));
allowSyscall(ctx, SCMP_SYS(fallocate));
allowSyscall(ctx, SCMP_SYS(fanotify_init));
allowSyscall(ctx, SCMP_SYS(fanotify_mark));
allowSyscall(ctx, SCMP_SYS(fchdir));
// skip fchmod (dangerous)
// skip fchmodat (dangerous)
// skip fchmodat2 (dangerous)
allowSyscall(ctx, SCMP_SYS(fchown));
allowSyscall(ctx, SCMP_SYS(fchown32));
allowSyscall(ctx, SCMP_SYS(fchownat));
allowSyscall(ctx, SCMP_SYS(fcntl));
allowSyscall(ctx, SCMP_SYS(fcntl64));
allowSyscall(ctx, SCMP_SYS(fdatasync));
allowSyscall(ctx, SCMP_SYS(fgetxattr));
allowSyscall(ctx, SCMP_SYS(finit_module));
allowSyscall(ctx, SCMP_SYS(flistxattr));
allowSyscall(ctx, SCMP_SYS(flock));
allowSyscall(ctx, SCMP_SYS(fork));
allowSyscall(ctx, SCMP_SYS(fremovexattr));
allowSyscall(ctx, SCMP_SYS(fsconfig));
// skip fsetxattr (dangerous)
allowSyscall(ctx, SCMP_SYS(fsmount));
allowSyscall(ctx, SCMP_SYS(fsopen));
allowSyscall(ctx, SCMP_SYS(fspick));
allowSyscall(ctx, SCMP_SYS(fstat));
allowSyscall(ctx, SCMP_SYS(fstat64));
allowSyscall(ctx, SCMP_SYS(fstatat64));
allowSyscall(ctx, SCMP_SYS(fstatfs));
allowSyscall(ctx, SCMP_SYS(fstatfs64));
allowSyscall(ctx, SCMP_SYS(fsync));
allowSyscall(ctx, SCMP_SYS(ftime));
allowSyscall(ctx, SCMP_SYS(ftruncate));
allowSyscall(ctx, SCMP_SYS(ftruncate64));
allowSyscall(ctx, SCMP_SYS(futex));
allowSyscall(ctx, SCMP_SYS(futex_requeue));
allowSyscall(ctx, SCMP_SYS(futex_time64));
allowSyscall(ctx, SCMP_SYS(futex_wait));
allowSyscall(ctx, SCMP_SYS(futex_waitv));
allowSyscall(ctx, SCMP_SYS(futex_wake));
allowSyscall(ctx, SCMP_SYS(futimesat));
allowSyscall(ctx, SCMP_SYS(getcpu));
allowSyscall(ctx, SCMP_SYS(getcwd));
allowSyscall(ctx, SCMP_SYS(getdents));
allowSyscall(ctx, SCMP_SYS(getdents64));
allowSyscall(ctx, SCMP_SYS(getegid));
allowSyscall(ctx, SCMP_SYS(getegid32));
allowSyscall(ctx, SCMP_SYS(geteuid));
allowSyscall(ctx, SCMP_SYS(geteuid32));
allowSyscall(ctx, SCMP_SYS(getgid));
allowSyscall(ctx, SCMP_SYS(getgid32));
allowSyscall(ctx, SCMP_SYS(getgroups));
allowSyscall(ctx, SCMP_SYS(getgroups32));
allowSyscall(ctx, SCMP_SYS(getitimer));
allowSyscall(ctx, SCMP_SYS(get_kernel_syms));
allowSyscall(ctx, SCMP_SYS(get_mempolicy));
allowSyscall(ctx, SCMP_SYS(getpeername));
allowSyscall(ctx, SCMP_SYS(getpgid));
allowSyscall(ctx, SCMP_SYS(getpgrp));
allowSyscall(ctx, SCMP_SYS(getpid));
allowSyscall(ctx, SCMP_SYS(getpmsg));
allowSyscall(ctx, SCMP_SYS(getppid));
allowSyscall(ctx, SCMP_SYS(getpriority));
allowSyscall(ctx, SCMP_SYS(getrandom));
allowSyscall(ctx, SCMP_SYS(getresgid));
allowSyscall(ctx, SCMP_SYS(getresgid32));
allowSyscall(ctx, SCMP_SYS(getresuid));
allowSyscall(ctx, SCMP_SYS(getresuid32));
allowSyscall(ctx, SCMP_SYS(getrlimit));
allowSyscall(ctx, SCMP_SYS(get_robust_list));
allowSyscall(ctx, SCMP_SYS(getrusage));
allowSyscall(ctx, SCMP_SYS(getsid));
allowSyscall(ctx, SCMP_SYS(getsockname));
allowSyscall(ctx, SCMP_SYS(getsockopt));
allowSyscall(ctx, SCMP_SYS(get_thread_area));
allowSyscall(ctx, SCMP_SYS(gettid));
allowSyscall(ctx, SCMP_SYS(gettimeofday));
allowSyscall(ctx, SCMP_SYS(get_tls));
allowSyscall(ctx, SCMP_SYS(getuid));
allowSyscall(ctx, SCMP_SYS(getuid32));
allowSyscall(ctx, SCMP_SYS(getxattr));
allowSyscall(ctx, SCMP_SYS(gtty));
allowSyscall(ctx, SCMP_SYS(idle));
allowSyscall(ctx, SCMP_SYS(init_module));
allowSyscall(ctx, SCMP_SYS(inotify_add_watch));
allowSyscall(ctx, SCMP_SYS(inotify_init));
allowSyscall(ctx, SCMP_SYS(inotify_init1));
allowSyscall(ctx, SCMP_SYS(inotify_rm_watch));
allowSyscall(ctx, SCMP_SYS(io_cancel));
allowSyscall(ctx, SCMP_SYS(ioctl));
allowSyscall(ctx, SCMP_SYS(io_destroy));
allowSyscall(ctx, SCMP_SYS(io_getevents));
allowSyscall(ctx, SCMP_SYS(ioperm));
allowSyscall(ctx, SCMP_SYS(io_pgetevents));
allowSyscall(ctx, SCMP_SYS(io_pgetevents_time64));
allowSyscall(ctx, SCMP_SYS(iopl));
allowSyscall(ctx, SCMP_SYS(ioprio_get));
allowSyscall(ctx, SCMP_SYS(ioprio_set));
allowSyscall(ctx, SCMP_SYS(io_setup));
allowSyscall(ctx, SCMP_SYS(io_submit));
// skip io_uring_enter (may become dangerous)
// skip io_uring_register (may become dangerous)
// skip io_uring_setup (may become dangerous)
allowSyscall(ctx, SCMP_SYS(ipc));
allowSyscall(ctx, SCMP_SYS(kcmp));
allowSyscall(ctx, SCMP_SYS(kexec_file_load));
allowSyscall(ctx, SCMP_SYS(kexec_load));
allowSyscall(ctx, SCMP_SYS(keyctl));
allowSyscall(ctx, SCMP_SYS(kill));
allowSyscall(ctx, SCMP_SYS(landlock_add_rule));
allowSyscall(ctx, SCMP_SYS(landlock_create_ruleset));
allowSyscall(ctx, SCMP_SYS(landlock_restrict_self));
allowSyscall(ctx, SCMP_SYS(lchown));
allowSyscall(ctx, SCMP_SYS(lchown32));
allowSyscall(ctx, SCMP_SYS(lgetxattr));
allowSyscall(ctx, SCMP_SYS(link));
allowSyscall(ctx, SCMP_SYS(linkat));
allowSyscall(ctx, SCMP_SYS(listen));
allowSyscall(ctx, SCMP_SYS(listxattr));
allowSyscall(ctx, SCMP_SYS(llistxattr));
allowSyscall(ctx, SCMP_SYS(_llseek));
allowSyscall(ctx, SCMP_SYS(lock));
allowSyscall(ctx, SCMP_SYS(lookup_dcookie));
allowSyscall(ctx, SCMP_SYS(lremovexattr));
allowSyscall(ctx, SCMP_SYS(lseek));
// skip lsetxattr (dangerous)
allowSyscall(ctx, SCMP_SYS(lstat));
allowSyscall(ctx, SCMP_SYS(lstat64));
allowSyscall(ctx, SCMP_SYS(madvise));
allowSyscall(ctx, SCMP_SYS(map_shadow_stack));
allowSyscall(ctx, SCMP_SYS(mbind));
allowSyscall(ctx, SCMP_SYS(membarrier));
allowSyscall(ctx, SCMP_SYS(memfd_create));
allowSyscall(ctx, SCMP_SYS(memfd_secret));
allowSyscall(ctx, SCMP_SYS(migrate_pages));
allowSyscall(ctx, SCMP_SYS(mincore));
allowSyscall(ctx, SCMP_SYS(mkdir));
allowSyscall(ctx, SCMP_SYS(mkdirat));
allowSyscall(ctx, SCMP_SYS(mknod));
allowSyscall(ctx, SCMP_SYS(mknodat));
allowSyscall(ctx, SCMP_SYS(mlock));
allowSyscall(ctx, SCMP_SYS(mlock2));
allowSyscall(ctx, SCMP_SYS(mlockall));
allowSyscall(ctx, SCMP_SYS(mmap));
allowSyscall(ctx, SCMP_SYS(mmap2));
allowSyscall(ctx, SCMP_SYS(modify_ldt));
allowSyscall(ctx, SCMP_SYS(mount));
allowSyscall(ctx, SCMP_SYS(mount_setattr));
allowSyscall(ctx, SCMP_SYS(move_mount));
allowSyscall(ctx, SCMP_SYS(move_pages));
allowSyscall(ctx, SCMP_SYS(mprotect));
allowSyscall(ctx, SCMP_SYS(mpx));
allowSyscall(ctx, SCMP_SYS(mq_getsetattr));
allowSyscall(ctx, SCMP_SYS(mq_notify));
allowSyscall(ctx, SCMP_SYS(mq_open));
allowSyscall(ctx, SCMP_SYS(mq_timedreceive));
allowSyscall(ctx, SCMP_SYS(mq_timedreceive_time64));
allowSyscall(ctx, SCMP_SYS(mq_timedsend));
allowSyscall(ctx, SCMP_SYS(mq_timedsend_time64));
allowSyscall(ctx, SCMP_SYS(mq_unlink));
allowSyscall(ctx, SCMP_SYS(mremap));
allowSyscall(ctx, SCMP_SYS(msgctl));
allowSyscall(ctx, SCMP_SYS(msgget));
allowSyscall(ctx, SCMP_SYS(msgrcv));
allowSyscall(ctx, SCMP_SYS(msgsnd));
allowSyscall(ctx, SCMP_SYS(msync));
allowSyscall(ctx, SCMP_SYS(multiplexer));
allowSyscall(ctx, SCMP_SYS(munlock));
allowSyscall(ctx, SCMP_SYS(munlockall));
allowSyscall(ctx, SCMP_SYS(munmap));
allowSyscall(ctx, SCMP_SYS(name_to_handle_at));
allowSyscall(ctx, SCMP_SYS(nanosleep));
allowSyscall(ctx, SCMP_SYS(newfstatat));
allowSyscall(ctx, SCMP_SYS(_newselect));
allowSyscall(ctx, SCMP_SYS(nfsservctl));
allowSyscall(ctx, SCMP_SYS(nice));
allowSyscall(ctx, SCMP_SYS(oldfstat));
allowSyscall(ctx, SCMP_SYS(oldlstat));
allowSyscall(ctx, SCMP_SYS(oldolduname));
allowSyscall(ctx, SCMP_SYS(oldstat));
allowSyscall(ctx, SCMP_SYS(olduname));
allowSyscall(ctx, SCMP_SYS(open));
allowSyscall(ctx, SCMP_SYS(openat));
allowSyscall(ctx, SCMP_SYS(openat2));
allowSyscall(ctx, SCMP_SYS(open_by_handle_at));
allowSyscall(ctx, SCMP_SYS(open_tree));
allowSyscall(ctx, SCMP_SYS(pause));
allowSyscall(ctx, SCMP_SYS(pciconfig_iobase));
allowSyscall(ctx, SCMP_SYS(pciconfig_read));
allowSyscall(ctx, SCMP_SYS(pciconfig_write));
allowSyscall(ctx, SCMP_SYS(perf_event_open));
allowSyscall(ctx, SCMP_SYS(personality));
allowSyscall(ctx, SCMP_SYS(pidfd_getfd));
allowSyscall(ctx, SCMP_SYS(pidfd_open));
allowSyscall(ctx, SCMP_SYS(pidfd_send_signal));
allowSyscall(ctx, SCMP_SYS(pipe));
allowSyscall(ctx, SCMP_SYS(pipe2));
allowSyscall(ctx, SCMP_SYS(pivot_root));
allowSyscall(ctx, SCMP_SYS(pkey_alloc));
allowSyscall(ctx, SCMP_SYS(pkey_free));
allowSyscall(ctx, SCMP_SYS(pkey_mprotect));
allowSyscall(ctx, SCMP_SYS(poll));
allowSyscall(ctx, SCMP_SYS(ppoll));
allowSyscall(ctx, SCMP_SYS(ppoll_time64));
allowSyscall(ctx, SCMP_SYS(prctl));
allowSyscall(ctx, SCMP_SYS(pread64));
allowSyscall(ctx, SCMP_SYS(preadv));
allowSyscall(ctx, SCMP_SYS(preadv2));
allowSyscall(ctx, SCMP_SYS(prlimit64));
allowSyscall(ctx, SCMP_SYS(process_madvise));
allowSyscall(ctx, SCMP_SYS(process_mrelease));
allowSyscall(ctx, SCMP_SYS(process_vm_readv));
allowSyscall(ctx, SCMP_SYS(process_vm_writev));
allowSyscall(ctx, SCMP_SYS(prof));
allowSyscall(ctx, SCMP_SYS(profil));
allowSyscall(ctx, SCMP_SYS(pselect6));
allowSyscall(ctx, SCMP_SYS(pselect6_time64));
allowSyscall(ctx, SCMP_SYS(ptrace));
allowSyscall(ctx, SCMP_SYS(putpmsg));
allowSyscall(ctx, SCMP_SYS(pwrite64));
allowSyscall(ctx, SCMP_SYS(pwritev));
allowSyscall(ctx, SCMP_SYS(pwritev2));
allowSyscall(ctx, SCMP_SYS(query_module));
allowSyscall(ctx, SCMP_SYS(quotactl));
allowSyscall(ctx, SCMP_SYS(quotactl_fd));
allowSyscall(ctx, SCMP_SYS(read));
allowSyscall(ctx, SCMP_SYS(readahead));
allowSyscall(ctx, SCMP_SYS(readdir));
allowSyscall(ctx, SCMP_SYS(readlink));
allowSyscall(ctx, SCMP_SYS(readlinkat));
allowSyscall(ctx, SCMP_SYS(readv));
allowSyscall(ctx, SCMP_SYS(reboot));
allowSyscall(ctx, SCMP_SYS(recv));
allowSyscall(ctx, SCMP_SYS(recvfrom));
allowSyscall(ctx, SCMP_SYS(recvmmsg));
allowSyscall(ctx, SCMP_SYS(recvmmsg_time64));
allowSyscall(ctx, SCMP_SYS(recvmsg));
allowSyscall(ctx, SCMP_SYS(remap_file_pages));
allowSyscall(ctx, SCMP_SYS(removexattr));
allowSyscall(ctx, SCMP_SYS(rename));
allowSyscall(ctx, SCMP_SYS(renameat));
allowSyscall(ctx, SCMP_SYS(renameat2));
allowSyscall(ctx, SCMP_SYS(request_key));
allowSyscall(ctx, SCMP_SYS(restart_syscall));
allowSyscall(ctx, SCMP_SYS(riscv_flush_icache));
allowSyscall(ctx, SCMP_SYS(rmdir));
allowSyscall(ctx, SCMP_SYS(rseq));
allowSyscall(ctx, SCMP_SYS(rtas));
allowSyscall(ctx, SCMP_SYS(rt_sigaction));
allowSyscall(ctx, SCMP_SYS(rt_sigpending));
allowSyscall(ctx, SCMP_SYS(rt_sigprocmask));
allowSyscall(ctx, SCMP_SYS(rt_sigqueueinfo));
allowSyscall(ctx, SCMP_SYS(rt_sigreturn));
allowSyscall(ctx, SCMP_SYS(rt_sigsuspend));
allowSyscall(ctx, SCMP_SYS(rt_sigtimedwait));
allowSyscall(ctx, SCMP_SYS(rt_sigtimedwait_time64));
allowSyscall(ctx, SCMP_SYS(rt_tgsigqueueinfo));
allowSyscall(ctx, SCMP_SYS(s390_guarded_storage));
allowSyscall(ctx, SCMP_SYS(s390_pci_mmio_read));
allowSyscall(ctx, SCMP_SYS(s390_pci_mmio_write));
allowSyscall(ctx, SCMP_SYS(s390_runtime_instr));
allowSyscall(ctx, SCMP_SYS(s390_sthyi));
allowSyscall(ctx, SCMP_SYS(sched_getaffinity));
allowSyscall(ctx, SCMP_SYS(sched_getattr));
allowSyscall(ctx, SCMP_SYS(sched_getparam));
allowSyscall(ctx, SCMP_SYS(sched_get_priority_max));
allowSyscall(ctx, SCMP_SYS(sched_get_priority_min));
allowSyscall(ctx, SCMP_SYS(sched_getscheduler));
allowSyscall(ctx, SCMP_SYS(sched_rr_get_interval));
allowSyscall(ctx, SCMP_SYS(sched_rr_get_interval_time64));
allowSyscall(ctx, SCMP_SYS(sched_setaffinity));
allowSyscall(ctx, SCMP_SYS(sched_setattr));
allowSyscall(ctx, SCMP_SYS(sched_setparam));
allowSyscall(ctx, SCMP_SYS(sched_setscheduler));
allowSyscall(ctx, SCMP_SYS(sched_yield));
allowSyscall(ctx, SCMP_SYS(seccomp));
allowSyscall(ctx, SCMP_SYS(security));
allowSyscall(ctx, SCMP_SYS(select));
allowSyscall(ctx, SCMP_SYS(semctl));
allowSyscall(ctx, SCMP_SYS(semget));
allowSyscall(ctx, SCMP_SYS(semop));
allowSyscall(ctx, SCMP_SYS(semtimedop));
allowSyscall(ctx, SCMP_SYS(semtimedop_time64));
allowSyscall(ctx, SCMP_SYS(send));
allowSyscall(ctx, SCMP_SYS(sendfile));
allowSyscall(ctx, SCMP_SYS(sendfile64));
allowSyscall(ctx, SCMP_SYS(sendmmsg));
allowSyscall(ctx, SCMP_SYS(sendmsg));
allowSyscall(ctx, SCMP_SYS(sendto));
allowSyscall(ctx, SCMP_SYS(setdomainname));
allowSyscall(ctx, SCMP_SYS(setfsgid));
allowSyscall(ctx, SCMP_SYS(setfsgid32));
allowSyscall(ctx, SCMP_SYS(setfsuid));
allowSyscall(ctx, SCMP_SYS(setfsuid32));
allowSyscall(ctx, SCMP_SYS(setgid));
allowSyscall(ctx, SCMP_SYS(setgid32));
allowSyscall(ctx, SCMP_SYS(setgroups));
allowSyscall(ctx, SCMP_SYS(setgroups32));
allowSyscall(ctx, SCMP_SYS(sethostname));
allowSyscall(ctx, SCMP_SYS(setitimer));
allowSyscall(ctx, SCMP_SYS(set_mempolicy));
allowSyscall(ctx, SCMP_SYS(set_mempolicy_home_node));
allowSyscall(ctx, SCMP_SYS(setns));
allowSyscall(ctx, SCMP_SYS(setpgid));
allowSyscall(ctx, SCMP_SYS(setpriority));
allowSyscall(ctx, SCMP_SYS(setregid));
allowSyscall(ctx, SCMP_SYS(setregid32));
allowSyscall(ctx, SCMP_SYS(setresgid));
allowSyscall(ctx, SCMP_SYS(setresgid32));
allowSyscall(ctx, SCMP_SYS(setresuid));
allowSyscall(ctx, SCMP_SYS(setresuid32));
allowSyscall(ctx, SCMP_SYS(setreuid));
allowSyscall(ctx, SCMP_SYS(setreuid32));
allowSyscall(ctx, SCMP_SYS(setrlimit));
allowSyscall(ctx, SCMP_SYS(set_robust_list));
allowSyscall(ctx, SCMP_SYS(setsid));
allowSyscall(ctx, SCMP_SYS(setsockopt));
allowSyscall(ctx, SCMP_SYS(set_thread_area));
allowSyscall(ctx, SCMP_SYS(set_tid_address));
allowSyscall(ctx, SCMP_SYS(settimeofday));
allowSyscall(ctx, SCMP_SYS(set_tls));
allowSyscall(ctx, SCMP_SYS(setuid));
allowSyscall(ctx, SCMP_SYS(setuid32));
// skip setxattr (dangerous)
allowSyscall(ctx, SCMP_SYS(sgetmask));
allowSyscall(ctx, SCMP_SYS(shmat));
allowSyscall(ctx, SCMP_SYS(shmctl));
allowSyscall(ctx, SCMP_SYS(shmdt));
allowSyscall(ctx, SCMP_SYS(shmget));
allowSyscall(ctx, SCMP_SYS(shutdown));
allowSyscall(ctx, SCMP_SYS(sigaction));
allowSyscall(ctx, SCMP_SYS(sigaltstack));
allowSyscall(ctx, SCMP_SYS(signal));
allowSyscall(ctx, SCMP_SYS(signalfd));
allowSyscall(ctx, SCMP_SYS(signalfd4));
allowSyscall(ctx, SCMP_SYS(sigpending));
allowSyscall(ctx, SCMP_SYS(sigprocmask));
allowSyscall(ctx, SCMP_SYS(sigreturn));
allowSyscall(ctx, SCMP_SYS(sigsuspend));
allowSyscall(ctx, SCMP_SYS(socket));
allowSyscall(ctx, SCMP_SYS(socketcall));
allowSyscall(ctx, SCMP_SYS(socketpair));
allowSyscall(ctx, SCMP_SYS(splice));
allowSyscall(ctx, SCMP_SYS(spu_create));
allowSyscall(ctx, SCMP_SYS(spu_run));
allowSyscall(ctx, SCMP_SYS(ssetmask));
allowSyscall(ctx, SCMP_SYS(stat));
allowSyscall(ctx, SCMP_SYS(stat64));
allowSyscall(ctx, SCMP_SYS(statfs));
allowSyscall(ctx, SCMP_SYS(statfs64));
allowSyscall(ctx, SCMP_SYS(statx));
allowSyscall(ctx, SCMP_SYS(stime));
allowSyscall(ctx, SCMP_SYS(stty));
allowSyscall(ctx, SCMP_SYS(subpage_prot));
allowSyscall(ctx, SCMP_SYS(swapcontext));
allowSyscall(ctx, SCMP_SYS(swapoff));
allowSyscall(ctx, SCMP_SYS(swapon));
allowSyscall(ctx, SCMP_SYS(switch_endian));
allowSyscall(ctx, SCMP_SYS(symlink));
allowSyscall(ctx, SCMP_SYS(symlinkat));
allowSyscall(ctx, SCMP_SYS(sync));
allowSyscall(ctx, SCMP_SYS(sync_file_range));
allowSyscall(ctx, SCMP_SYS(sync_file_range2));
allowSyscall(ctx, SCMP_SYS(syncfs));
allowSyscall(ctx, SCMP_SYS(syscall));
allowSyscall(ctx, SCMP_SYS(_sysctl));
allowSyscall(ctx, SCMP_SYS(sys_debug_setcontext));
allowSyscall(ctx, SCMP_SYS(sysfs));
allowSyscall(ctx, SCMP_SYS(sysinfo));
allowSyscall(ctx, SCMP_SYS(syslog));
allowSyscall(ctx, SCMP_SYS(sysmips));
allowSyscall(ctx, SCMP_SYS(tee));
allowSyscall(ctx, SCMP_SYS(tgkill));
allowSyscall(ctx, SCMP_SYS(time));
allowSyscall(ctx, SCMP_SYS(timer_create));
allowSyscall(ctx, SCMP_SYS(timer_delete));
allowSyscall(ctx, SCMP_SYS(timerfd));
allowSyscall(ctx, SCMP_SYS(timerfd_create));
allowSyscall(ctx, SCMP_SYS(timerfd_gettime));
allowSyscall(ctx, SCMP_SYS(timerfd_gettime64));
allowSyscall(ctx, SCMP_SYS(timerfd_settime));
allowSyscall(ctx, SCMP_SYS(timerfd_settime64));
allowSyscall(ctx, SCMP_SYS(timer_getoverrun));
allowSyscall(ctx, SCMP_SYS(timer_gettime));
allowSyscall(ctx, SCMP_SYS(timer_gettime64));
allowSyscall(ctx, SCMP_SYS(timer_settime));
allowSyscall(ctx, SCMP_SYS(timer_settime64));
allowSyscall(ctx, SCMP_SYS(times));
allowSyscall(ctx, SCMP_SYS(tkill));
allowSyscall(ctx, SCMP_SYS(truncate));
allowSyscall(ctx, SCMP_SYS(truncate64));
allowSyscall(ctx, SCMP_SYS(tuxcall));
allowSyscall(ctx, SCMP_SYS(ugetrlimit));
allowSyscall(ctx, SCMP_SYS(ulimit));
allowSyscall(ctx, SCMP_SYS(umask));
allowSyscall(ctx, SCMP_SYS(umount));
allowSyscall(ctx, SCMP_SYS(umount2));
allowSyscall(ctx, SCMP_SYS(uname));
allowSyscall(ctx, SCMP_SYS(unlink));
allowSyscall(ctx, SCMP_SYS(unlinkat));
allowSyscall(ctx, SCMP_SYS(unshare));
allowSyscall(ctx, SCMP_SYS(uselib));
allowSyscall(ctx, SCMP_SYS(userfaultfd));
allowSyscall(ctx, SCMP_SYS(usr26));
allowSyscall(ctx, SCMP_SYS(usr32));
allowSyscall(ctx, SCMP_SYS(ustat));
allowSyscall(ctx, SCMP_SYS(utime));
allowSyscall(ctx, SCMP_SYS(utimensat));
allowSyscall(ctx, SCMP_SYS(utimensat_time64));
allowSyscall(ctx, SCMP_SYS(utimes));
allowSyscall(ctx, SCMP_SYS(vfork));
allowSyscall(ctx, SCMP_SYS(vhangup));
allowSyscall(ctx, SCMP_SYS(vm86));
allowSyscall(ctx, SCMP_SYS(vm86old));
allowSyscall(ctx, SCMP_SYS(vmsplice));
allowSyscall(ctx, SCMP_SYS(vserver));
allowSyscall(ctx, SCMP_SYS(wait4));
allowSyscall(ctx, SCMP_SYS(waitid));
allowSyscall(ctx, SCMP_SYS(waitpid));
allowSyscall(ctx, SCMP_SYS(write));
allowSyscall(ctx, SCMP_SYS(writev));
// END extract-syscalls
// chmod family: prevent adding setuid/setgid bits to existing files.
// The Nix store does not support setuid/setgid, and even their temporary creation can weaken the security of the sandbox.
ALLOW_CHMOD_IF_SAFE(ctx, SCMP_SYS(chmod), 1);
ALLOW_CHMOD_IF_SAFE(ctx, SCMP_SYS(fchmod), 1);
ALLOW_CHMOD_IF_SAFE(ctx, SCMP_SYS(fchmodat), 2);
ALLOW_CHMOD_IF_SAFE(ctx, SCMP_SYS(fchmodat2), 2);
// setxattr family: prevent creation of extended attributes or ACLs.
// Not all filesystems support them, and they're incompatible with the NAR format.
if (seccomp_rule_add(ctx, SCMP_ACT_ERRNO(ENOTSUP), SCMP_SYS(setxattr), 0) != 0 ||
seccomp_rule_add(ctx, SCMP_ACT_ERRNO(ENOTSUP), SCMP_SYS(lsetxattr), 0) != 0 ||
seccomp_rule_add(ctx, SCMP_ACT_ERRNO(ENOTSUP), SCMP_SYS(fsetxattr), 0) != 0)
throw SysError("unable to add seccomp rule");
// Set the NO_NEW_PRIVS prctl flag.
// This both makes loading seccomp filters work for unprivileged users,
// and is an additional security measure in its own right.
if (seccomp_attr_set(ctx, SCMP_FLTATR_CTL_NNP, 1) != 0)
throw SysError("unable to set 'no new privileges' seccomp attribute");
if (seccomp_load(ctx) != 0)
throw SysError("unable to load seccomp BPF program");
#else
// Still set the no-new-privileges flag if libseccomp is not available.
if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) == -1)
throw SysError("PR_SET_NO_NEW_PRIVS failed");
#endif
}
void LinuxLocalDerivationGoal::prepareSandbox()
{
/* Create a temporary directory in which we set up the chroot

5
src/libstore/platform/linux.hh
View file

@ -59,6 +59,11 @@ private:
*/
void killSandbox(bool getStatus) override;
/**
* Set up system call filtering using seccomp, unless disabled at build time.
* This also sets the NO_NEW_PRIVS flag.
*/
void setupSyscallFilter() override;
bool supportsUidRange() override
{