system/systemd
system/systemd
1
0
Fork 0
mirror of https://github.com/systemd/systemd synced 2024-07-08 20:15:55 +00:00
Code Issues Projects Releases Wiki Activity

core: improve seccomp syscall grouping a bit

Browse Source 
This adds three new seccomp syscall groups: @keyring for kernel keyring access,
@cpu-emulation for CPU emulation features, for exampe vm86() for dosemu and
suchlike, and @debug for ptrace() and related calls.

Also, the @clock group is updated with more syscalls that alter the system
clock. capset() is added to @privileged, and pciconfig_iobase() is added to
@raw-io.

Finally, @obsolete is a cleaned up. A number of syscalls that never existed on
Linux and have no number assigned on any architecture are removed, as they only
exist in the man pages and other operating sytems, but not in code at all.
create_module() is moved from @module to @obsolete, as it is an obsolete system
call. mem_getpolicy() is removed from the @obsolete list, as it is not
obsolete, but simply a NUMA API.
This commit is contained in:
Lennart Poettering 2016-06-10 17:43:38 +02:00
parent 50b52222f2
commit 1f9ac68b5b
2 changed files with 58 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
man/systemd.exec.xml
View File

@ -1218,49 +1218,55 @@
<tbody>
<row>
<entry>@clock</entry>
<entry>System calls for changing the system clock (<function>adjtimex()</function>,
<function>settimeofday()</function>)</entry>
<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>
</row>
<row>
<entry>@cpu-emulation</entry>
<entry>System calls for CPU emulation functionality (<citerefentry project='man-pages'><refentrytitle>vm86</refentrytitle><manvolnum>2</manvolnum></citerefentry> and related calls)</entry>
</row>
<row>
<entry>@debug</entry>
<entry>Debugging, performance monitoring and tracing functionality (<citerefentry project='man-pages'><refentrytitle>ptrace</refentrytitle><manvolnum>2</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>perf_event_open</refentrytitle><manvolnum>2</manvolnum></citerefentry> and related calls)</entry>
</row>
<row>
<entry>@io-event</entry>
<entry>Event loop use (<function>poll()</function>, <function>select()</function>,
<citerefentry project='man-pages'><refentrytitle>epoll</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
<function>eventfd()</function>...)</entry>
<entry>Event loop system calls (<citerefentry project='man-pages'><refentrytitle>poll</refentrytitle><manvolnum>2</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>select</refentrytitle><manvolnum>2</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>epoll</refentrytitle><manvolnum>7</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>eventfd</refentrytitle><manvolnum>2</manvolnum></citerefentry> and related calls)</entry>
</row>
<row>
<entry>@ipc</entry>
<entry>SysV IPC, POSIX Message Queues or other IPC (<citerefentry project='man-pages'><refentrytitle>mq_overview</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>svipc</refentrytitle><manvolnum>7</manvolnum></citerefentry>)</entry>
<entry>SysV IPC, POSIX Message Queues or other IPC (<citerefentry project='man-pages'><refentrytitle>mq_overview</refentrytitle><manvolnum>7</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>svipc</refentrytitle><manvolnum>7</manvolnum></citerefentry>)</entry>
</row>
<row>
<entry>@keyring</entry>
<entry>Kernel keyring access (<citerefentry project='man-pages'><refentrytitle>keyctl</refentrytitle><manvolnum>2</manvolnum></citerefentry> and related calls)</entry>
</row>
<row>
<entry>@module</entry>
<entry>Kernel module control (<function>create_module()</function>, <function>init_module()</function>...)</entry>
<entry>Kernel module control (<citerefentry project='man-pages'><refentrytitle>init_module</refentrytitle><manvolnum>2</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>delete_module</refentrytitle><manvolnum>2</manvolnum></citerefentry> and related calls)</entry>
</row>
<row>
<entry>@mount</entry>
<entry>File system mounting and unmounting (<function>chroot()</function>, <function>mount()</function>...)</entry>
<entry>File system mounting and unmounting (<citerefentry project='man-pages'><refentrytitle>mount</refentrytitle><manvolnum>2</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>chroot</refentrytitle><manvolnum>2</manvolnum></citerefentry>, and related calls)</entry>
</row>
<row>
<entry>@network-io</entry>
<entry>Socket I/O (including local AF_UNIX):
<citerefentry project='man-pages'><refentrytitle>socket</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>unix</refentrytitle><manvolnum>7</manvolnum></citerefentry></entry>
<entry>Socket I/O (including local AF_UNIX): <citerefentry project='man-pages'><refentrytitle>socket</refentrytitle><manvolnum>7</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>unix</refentrytitle><manvolnum>7</manvolnum></citerefentry></entry>
</row>
<row>
<entry>@obsolete</entry>
<entry>Unusual, obsolete or unimplemented (<function>fattach()</function>, <function>gtty()</function>, <function>vm86()</function>...)</entry>
<entry>Unusual, obsolete or unimplemented (<citerefentry project='man-pages'><refentrytitle>create_module</refentrytitle><manvolnum>2</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>gtty</refentrytitle><manvolnum>2</manvolnum></citerefentry>, …)</entry>
</row>
<row>
<entry>@privileged</entry>
<entry>All system calls which need superuser capabilities (<citerefentry project='man-pages'><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry>)</entry>
<entry>All system calls which need super-user capabilities (<citerefentry project='man-pages'><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry>)</entry>
</row>
<row>
<entry>@process</entry>
<entry>Process control, execution, namespaces (<function>execve()</function>, <function>kill()</function>, <citerefentry project='man-pages'><refentrytitle>namespaces</refentrytitle><manvolnum>7</manvolnum></citerefentry>...)</entry>
<entry>Process control, execution, namespaces (<citerefentry project='man-pages'><refentrytitle>execve</refentrytitle><manvolnum>2</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>kill</refentrytitle><manvolnum>2</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>namespaces</refentrytitle><manvolnum>7</manvolnum></citerefentry>, …</entry>
</row>
<row>
<entry>@raw-io</entry>
<entry>Raw I/O ports (<function>ioperm()</function>, <function>iopl()</function>, <function>pciconfig_read()</function>...)</entry>
<entry>Raw I/O port access (<citerefentry project='man-pages'><refentrytitle>ioperm</refentrytitle><manvolnum>2</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>iopl</refentrytitle><manvolnum>2</manvolnum></citerefentry>, <function>pciconfig_read()</function>, …</entry>
</row>
</tbody>
</tgroup>

55
src/shared/seccomp-util.c
View File

@ -95,7 +95,31 @@ const SystemCallFilterSet syscall_filter_sets[] = {
.set_name = "@clock",
.value =
"adjtimex\0"
"clock_adjtime\0"
"clock_settime\0"
"settimeofday\0"
"stime\0"
}, {
/* CPU emulation calls */
.set_name = "@cpu-emulation",
.value =
"modify_ldt\0"
"subpage_prot\0"
"switch_endian\0"
"vm86\0"
"vm86old\0"
}, {
/* Debugging/Performance Monitoring/Tracing */
.set_name = "@debug",
.value =
"lookup_dcookie\0"
"perf_event_open\0"
"process_vm_readv\0"
"process_vm_writev\0"
"ptrace\0"
"rtas\0"
"s390_runtime_instr\0"
"sys_debug_setcontext\0"
}, {
/* Default list */
.set_name = "@default",
@ -147,11 +171,17 @@ const SystemCallFilterSet syscall_filter_sets[] = {
"shmctl\0"
"shmdt\0"
"shmget\0"
}, {
/* Keyring */
.set_name = "@keyring",
.value =
"add_key\0"
"keyctl\0"
"request_key\0"
}, {
/* Kernel module control */
.set_name = "@module",
.value =
"create_module\0"
"delete_module\0"
"finit_module\0"
"init_module\0"
@ -197,40 +227,26 @@ const SystemCallFilterSet syscall_filter_sets[] = {
"_sysctl\0"
"afs_syscall\0"
"break\0"
"fattach\0"
"fdetach\0"
"create_module\0"
"ftime\0"
"get_kernel_syms\0"
"get_mempolicy\0"
"getmsg\0"
"getpmsg\0"
"gtty\0"
"isastream\0"
"lock\0"
"madvise1\0"
"modify_ldt\0"
"mpx\0"
"pciconfig_iobase\0"
"perf_event_open\0"
"prof\0"
"profil\0"
"putmsg\0"
"putpmsg\0"
"query_module\0"
"rtas\0"
"s390_runtime_instr\0"
"security\0"
"sgetmask\0"
"ssetmask\0"
"stty\0"
"subpage_prot\0"
"switch_endian\0"
"sys_debug_setcontext\0"
"sysfs\0"
"tuxcall\0"
"ulimit\0"
"uselib\0"
"vm86\0"
"vm86old\0"
"ustat\0"
"vserver\0"
}, {
/* Nice grab-bag of all system calls which need superuser capabilities */
@ -242,6 +258,7 @@ const SystemCallFilterSet syscall_filter_sets[] = {
"acct\0"
"bdflush\0"
"bpf\0"
"capset\0"
"chown32\0"
"chown\0"
"chroot\0"
@ -268,7 +285,6 @@ const SystemCallFilterSet syscall_filter_sets[] = {
"setreuid\0"
"setuid32\0"
"setuid\0"
"stime\0"
"swapoff\0"
"swapon\0"
"sysctl\0"
@ -295,6 +311,7 @@ const SystemCallFilterSet syscall_filter_sets[] = {
.value =
"ioperm\0"
"iopl\0"
"pciconfig_iobase\0"
"pciconfig_read\0"
"pciconfig_write\0"
"s390_pci_mmio_read\0"