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authorLennart Poettering <lennart@poettering.net>2016-10-21 21:48:10 +0200
committerLennart Poettering <lennart@poettering.net>2016-10-24 17:32:51 +0200
commitf6281133def1da2d7ac875b8cf5af5c32bc63fd8 (patch)
tree15a8fb957b83e1f4162bfab45eda70a3772030fe
parenta3be2849b2570482757f83181b999febbfc7bbef (diff)
seccomp: add test-seccomp test tool
This validates the system call set table and many of our seccomp-util.c APIs.
-rw-r--r--Makefile.am11
-rw-r--r--src/shared/seccomp-util.h1
-rw-r--r--src/test/test-seccomp.c103
3 files changed, 115 insertions, 0 deletions
diff --git a/Makefile.am b/Makefile.am
index 18a5f4a82a..8ef3b42c41 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1570,6 +1570,11 @@ tests += \
test-acl-util
endif
+if HAVE_SECCOMP
+tests += \
+ test-seccomp
+endif
+
EXTRA_DIST += \
test/a.service \
test/basic.target \
@@ -2038,6 +2043,12 @@ test_acl_util_SOURCES = \
test_acl_util_LDADD = \
libsystemd-shared.la
+test_seccomp_SOURCES = \
+ src/test/test-seccomp.c
+
+test_seccomp_LDADD = \
+ libsystemd-shared.la
+
test_namespace_LDADD = \
libcore.la
diff --git a/src/shared/seccomp-util.h b/src/shared/seccomp-util.h
index 667687b14f..8050fc6fbf 100644
--- a/src/shared/seccomp-util.h
+++ b/src/shared/seccomp-util.h
@@ -20,6 +20,7 @@
***/
#include <seccomp.h>
+#include <stdbool.h>
#include <stdint.h>
const char* seccomp_arch_to_string(uint32_t c);
diff --git a/src/test/test-seccomp.c b/src/test/test-seccomp.c
new file mode 100644
index 0000000000..0060ecdf02
--- /dev/null
+++ b/src/test/test-seccomp.c
@@ -0,0 +1,103 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2016 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdlib.h>
+#include <sys/eventfd.h>
+#include <unistd.h>
+
+#include "fd-util.h"
+#include "macro.h"
+#include "process-util.h"
+#include "seccomp-util.h"
+
+static void test_seccomp_arch_to_string(void) {
+ uint32_t a, b;
+ const char *name;
+
+ a = seccomp_arch_native();
+ assert_se(a > 0);
+ name = seccomp_arch_to_string(a);
+ assert_se(name);
+ assert_se(seccomp_arch_from_string(name, &b) >= 0);
+ assert_se(a == b);
+}
+
+static void test_syscall_filter_set_find(void) {
+ assert_se(!syscall_filter_set_find(NULL));
+ assert_se(!syscall_filter_set_find(""));
+ assert_se(!syscall_filter_set_find("quux"));
+ assert_se(!syscall_filter_set_find("@quux"));
+
+ assert_se(syscall_filter_set_find("@clock") == syscall_filter_sets + SYSCALL_FILTER_SET_CLOCK);
+ assert_se(syscall_filter_set_find("@default") == syscall_filter_sets + SYSCALL_FILTER_SET_DEFAULT);
+ assert_se(syscall_filter_set_find("@raw-io") == syscall_filter_sets + SYSCALL_FILTER_SET_RAW_IO);
+}
+
+static void test_filter_sets(void) {
+ unsigned i;
+ int r;
+
+ if (!is_seccomp_available())
+ return;
+
+ if (geteuid() != 0)
+ return;
+
+ for (i = 0; i < _SYSCALL_FILTER_SET_MAX; i++) {
+ pid_t pid;
+
+ log_info("Testing %s", syscall_filter_sets[i].name);
+
+ pid = fork();
+ assert_se(pid >= 0);
+
+ if (pid == 0) { /* Child? */
+ int fd;
+
+ if (i == SYSCALL_FILTER_SET_DEFAULT) /* if we look at the default set, whitelist instead of blacklist */
+ r = seccomp_load_filter_set(SCMP_ACT_ERRNO(EPERM), syscall_filter_sets + i, SCMP_ACT_ALLOW);
+ else
+ r = seccomp_load_filter_set(SCMP_ACT_ALLOW, syscall_filter_sets + i, SCMP_ACT_ERRNO(EPERM));
+ if (r < 0)
+ _exit(EXIT_FAILURE);
+
+ /* Test the sycall filter with one random system call */
+ fd = eventfd(0, EFD_NONBLOCK|EFD_CLOEXEC);
+ if (IN_SET(i, SYSCALL_FILTER_SET_IO_EVENT, SYSCALL_FILTER_SET_DEFAULT))
+ assert_se(fd < 0 && errno == EPERM);
+ else {
+ assert_se(fd >= 0);
+ safe_close(fd);
+ }
+
+ _exit(EXIT_SUCCESS);
+ }
+
+ assert_se(wait_for_terminate_and_warn(syscall_filter_sets[i].name, pid, true) == EXIT_SUCCESS);
+ }
+}
+
+int main(int argc, char *argv[]) {
+
+ test_seccomp_arch_to_string();
+ test_syscall_filter_set_find();
+ test_filter_sets();
+
+ return 0;
+}