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seccomp: add two new syscall groups

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@resources contains various syscalls that alter resource limits and memory and
scheduling parameters of processes. As such they are good candidates to block
for most services.

@basic-io contains a number of basic syscalls for I/O, similar to the list
seccomp v1 permitted but slightly more complete. It should be useful for
building basic whitelisting for minimal sandboxes
This commit is contained in:
Lennart Poettering 2016-11-02 08:46:18 -06:00
parent aa6b9cec88
commit 133ddbbeae
3 changed files with 44 additions and 0 deletions
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8
man/systemd.exec.xml
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@ -1301,6 +1301,10 @@
</row>
</thead>
<tbody>
<row>
<entry>@basic-io</entry>
<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>
</row>
<row>
<entry>@clock</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>
@ -1353,6 +1357,10 @@
<entry>@raw-io</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>
<row>
<entry>@resources</entry>
<entry>System calls for changing resource limits, memory and scheduling parameters (<citerefentry project='man-pages'><refentrytitle>setrlimit</refentrytitle><manvolnum>2</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>setpriority</refentrytitle><manvolnum>2</manvolnum></citerefentry>, …)</entry>
</row>
</tbody>
</tgroup>
</table>

34
src/shared/seccomp-util.c
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@ -217,6 +217,24 @@ bool is_seccomp_available(void) {
}
const SyscallFilterSet syscall_filter_sets[_SYSCALL_FILTER_SET_MAX] = {
[SYSCALL_FILTER_SET_BASIC_IO] = {
/* Basic IO */
.name = "@basic-io",
.value =
"close\0"
"dup2\0"
"dup3\0"
"dup\0"
"lseek\0"
"pread64\0"
"preadv\0"
"pwrite64\0"
"pwritev\0"
"read\0"
"readv\0"
"write\0"
"writev\0"
},
[SYSCALL_FILTER_SET_CLOCK] = {
/* Clock */
.name = "@clock",
@ -472,6 +490,22 @@ const SyscallFilterSet syscall_filter_sets[_SYSCALL_FILTER_SET_MAX] = {
"s390_pci_mmio_write\0"
#endif
},
[SYSCALL_FILTER_SET_RESOURCES] = {
/* Alter resource settings */
.name = "@resources",
.value =
"sched_setparam\0"
"sched_setscheduler\0"
"sched_setaffinity\0"
"setpriority\0"
"setrlimit\0"
"set_mempolicy\0"
"migrate_pages\0"
"move_pages\0"
"mbind\0"
"sched_setattr\0"
"prlimit64\0"
},
};
const SyscallFilterSet *syscall_filter_set_find(const char *name) {

2
src/shared/seccomp-util.h
View File

@ -38,6 +38,7 @@ typedef struct SyscallFilterSet {
} SyscallFilterSet;
enum {
SYSCALL_FILTER_SET_BASIC_IO,
SYSCALL_FILTER_SET_CLOCK,
SYSCALL_FILTER_SET_CPU_EMULATION,
SYSCALL_FILTER_SET_DEBUG,
@ -52,6 +53,7 @@ enum {
SYSCALL_FILTER_SET_PRIVILEGED,
SYSCALL_FILTER_SET_PROCESS,
SYSCALL_FILTER_SET_RAW_IO,
SYSCALL_FILTER_SET_RESOURCES,
_SYSCALL_FILTER_SET_MAX
};