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seccomp: add three more seccomp groups
@aio → asynchronous IO calls @sync → msync/fsync/... and friends @chown → changing file ownership (Also, change @privileged to reference @chown now, instead of the individual syscalls it contains)
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Lennart Poettering
parent
608f70e6b4
commit
44898c5358
4
NEWS
4
NEWS
@ -115,8 +115,8 @@ CHANGES WITH 235:
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each time the service is restarted due to Restart=, and may be
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queried using "systemctl show -p NRestarts …".
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* New system call filter groups @setuid, @memlock, @signal and
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@timer have been added, for usage with SystemCallFilter=
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* New system call filter groups @aio, @sync, @chown, @setuid, @memlock,
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@signal and @timer have been added, for usage with SystemCallFilter=
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in unit files and the new --system-call-filter= command line option
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of systemd-nspawn (see above).
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@ -1490,10 +1490,18 @@ CapabilityBoundingSet=~CAP_B CAP_C</programlisting>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>@aio</entry>
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<entry>Asynchronous I/O (<citerefentry project='man-pages'><refentrytitle>io_setup</refentrytitle><manvolnum>2</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>io_submit</refentrytitle><manvolnum>2</manvolnum></citerefentry>, and related calls)</entry>
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</row>
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<row>
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<entry>@basic-io</entry>
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<entry>System calls for basic I/O: reading, writing, seeking, file descriptor duplication and closing (<citerefentry project='man-pages'><refentrytitle>read</refentrytitle><manvolnum>2</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>write</refentrytitle><manvolnum>2</manvolnum></citerefentry>, and related calls)</entry>
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</row>
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<row>
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<entry>@chown</entry>
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<entry>Changing file ownership (<citerefentry project='man-pages'><refentrytitle>chown</refentrytitle><manvolnum>2</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>fchownat</refentrytitle><manvolnum>2</manvolnum></citerefentry>, and related calls)</entry>
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</row>
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<row>
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<entry>@clock</entry>
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<entry>System calls for changing the system clock (<citerefentry project='man-pages'><refentrytitle>adjtimex</refentrytitle><manvolnum>2</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>settimeofday</refentrytitle><manvolnum>2</manvolnum></citerefentry>, and related calls)</entry>
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@ -1574,6 +1582,10 @@ CapabilityBoundingSet=~CAP_B CAP_C</programlisting>
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<entry>@swap</entry>
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<entry>System calls for enabling/disabling swap devices (<citerefentry project='man-pages'><refentrytitle>swapon</refentrytitle><manvolnum>2</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>swapoff</refentrytitle><manvolnum>2</manvolnum></citerefentry>)</entry>
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</row>
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<row>
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<entry>@sync</entry>
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<entry>Synchronizing files and memory to disk: (<citerefentry project='man-pages'><refentrytitle>fsync</refentrytitle><manvolnum>2</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>msync</refentrytitle><manvolnum>2</manvolnum></citerefentry>, and related calls)</entry>
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</row>
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<row>
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<entry>@timer</entry>
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<entry>System calls for scheduling operations by time (<citerefentry project='man-pages'><refentrytitle>alarm</refentrytitle><manvolnum>2</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>timer_create</refentrytitle><manvolnum>2</manvolnum></citerefentry>, …)</entry>
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@ -49,7 +49,9 @@ static int seccomp_add_default_syscall_filter(
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const char* name;
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} whitelist[] = {
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/* Let's use set names where we can */
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{ 0, "@aio" },
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{ 0, "@basic-io" },
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{ 0, "@chown" },
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{ 0, "@default" },
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{ 0, "@file-system" },
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{ 0, "@io-event" },
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@ -60,6 +62,7 @@ static int seccomp_add_default_syscall_filter(
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{ 0, "@resources" },
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{ 0, "@setuid" },
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{ 0, "@signal" },
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{ 0, "@sync" },
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{ 0, "@timer" },
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/* The following four are sets we optionally enable, in case the caps have been configured for it */
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@ -72,42 +75,25 @@ static int seccomp_add_default_syscall_filter(
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{ 0, "brk" },
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{ 0, "capget" },
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{ 0, "capset" },
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{ 0, "chown" },
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{ 0, "chown32" },
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{ 0, "copy_file_range" },
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{ 0, "fadvise64" },
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{ 0, "fadvise64_64" },
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{ 0, "fchown" },
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{ 0, "fchown32" },
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{ 0, "fchownat" },
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{ 0, "fdatasync" },
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{ 0, "flock" },
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{ 0, "fsync" },
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{ 0, "get_mempolicy" },
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{ 0, "getcpu" },
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{ 0, "getpriority" },
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{ 0, "getrandom" },
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{ 0, "io_cancel" },
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{ 0, "io_destroy" },
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{ 0, "io_getevents" },
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{ 0, "io_setup" },
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{ 0, "io_submit" },
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{ 0, "ioctl" },
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{ 0, "ioprio_get" },
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{ 0, "kcmp" },
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{ 0, "lchown" },
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{ 0, "lchown32" },
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{ 0, "madvise" },
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{ 0, "mincore" },
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{ 0, "mprotect" },
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{ 0, "mremap" },
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{ 0, "msync" },
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{ 0, "name_to_handle_at" },
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{ 0, "oldolduname" },
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{ 0, "olduname" },
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{ 0, "personality" },
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{ 0, "preadv2" },
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{ 0, "pwritev2" },
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{ 0, "readahead" },
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{ 0, "readdir" },
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{ 0, "remap_file_pages" },
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@ -131,9 +117,6 @@ static int seccomp_add_default_syscall_filter(
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{ 0, "setpgid" },
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{ 0, "setsid" },
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{ 0, "splice" },
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{ 0, "sync" },
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{ 0, "sync_file_range" },
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{ 0, "syncfs" },
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{ 0, "sysinfo" },
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{ 0, "tee" },
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{ 0, "umask" },
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@ -317,6 +317,16 @@ const SyscallFilterSet syscall_filter_sets[_SYSCALL_FILTER_SET_MAX] = {
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"time\0"
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"ugetrlimit\0"
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},
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[SYSCALL_FILTER_SET_AIO] = {
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.name = "@aio",
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.help = "Asynchronous IO",
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.value =
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"io_cancel\0"
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"io_destroy\0"
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"io_getevents\0"
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"io_setup\0"
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"io_submit\0"
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},
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[SYSCALL_FILTER_SET_BASIC_IO] = {
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.name = "@basic-io",
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.help = "Basic IO",
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@ -329,13 +339,27 @@ const SyscallFilterSet syscall_filter_sets[_SYSCALL_FILTER_SET_MAX] = {
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"lseek\0"
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"pread64\0"
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"preadv\0"
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"preadv2\0"
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"pwrite64\0"
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"pwritev\0"
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"pwritev2\0"
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"read\0"
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"readv\0"
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"write\0"
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"writev\0"
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},
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[SYSCALL_FILTER_SET_CHOWN] = {
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.name = "@chown",
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.help = "Change ownership of files and directories",
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.value =
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"chown\0"
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"chown32\0"
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"fchown\0"
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"fchown32\0"
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"fchownat\0"
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"lchown\0"
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"lchown32\0"
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},
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[SYSCALL_FILTER_SET_CLOCK] = {
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.name = "@clock",
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.help = "Change the system time",
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@ -600,6 +624,7 @@ const SyscallFilterSet syscall_filter_sets[_SYSCALL_FILTER_SET_MAX] = {
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.name = "@privileged",
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.help = "All system calls which need super-user capabilities",
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.value =
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"@chown\0"
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"@clock\0"
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"@module\0"
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"@raw-io\0"
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@ -607,16 +632,9 @@ const SyscallFilterSet syscall_filter_sets[_SYSCALL_FILTER_SET_MAX] = {
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"acct\0"
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"bpf\0"
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"capset\0"
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"chown\0"
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"chown32\0"
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"chroot\0"
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"fchown\0"
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"fchown32\0"
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"fchownat\0"
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"kexec_file_load\0"
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"kexec_load\0"
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"lchown\0"
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"lchown32\0"
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"nfsservctl\0"
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"pivot_root\0"
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"quotactl\0"
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@ -746,6 +764,17 @@ const SyscallFilterSet syscall_filter_sets[_SYSCALL_FILTER_SET_MAX] = {
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"swapoff\0"
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"swapon\0"
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},
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[SYSCALL_FILTER_SET_SYNC] = {
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.name = "@sync",
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.help = "Synchronize files and memory to storage",
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.value =
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"fdatasync\0"
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"fsync\0"
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"msync\0"
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"sync\0"
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"sync_file_range\0"
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"syncfs\0"
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},
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[SYSCALL_FILTER_SET_TIMER] = {
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.name = "@timer",
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.help = "Schedule operations by time",
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@ -41,7 +41,9 @@ typedef struct SyscallFilterSet {
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enum {
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/* Please leave DEFAULT first, but sort the rest alphabetically */
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SYSCALL_FILTER_SET_DEFAULT,
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SYSCALL_FILTER_SET_AIO,
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SYSCALL_FILTER_SET_BASIC_IO,
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SYSCALL_FILTER_SET_CHOWN,
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SYSCALL_FILTER_SET_CLOCK,
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SYSCALL_FILTER_SET_CPU_EMULATION,
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SYSCALL_FILTER_SET_DEBUG,
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@ -62,6 +64,7 @@ enum {
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SYSCALL_FILTER_SET_SETUID,
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SYSCALL_FILTER_SET_SIGNAL,
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SYSCALL_FILTER_SET_SWAP,
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SYSCALL_FILTER_SET_SYNC,
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SYSCALL_FILTER_SET_TIMER,
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_SYSCALL_FILTER_SET_MAX
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};
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