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/*
* QEMU seccomp test suite
*
* Copyright (c) 2021 Red Hat, Inc.
*
* This library 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.
*
* This library 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 this library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include "qemu/osdep.h"
#include "qemu/config-file.h"
#include "qemu/option.h"
#include "sysemu/seccomp.h"
#include "qapi/error.h"
#include "qemu/module.h"
#include <sys/syscall.h>
static void test_seccomp_helper(const char *args, bool killed,
int errnum, int (*doit)(void))
{
if (g_test_subprocess()) {
QemuOptsList *olist;
QemuOpts *opts;
int ret;
module_call_init(MODULE_INIT_OPTS);
olist = qemu_find_opts("sandbox");
g_assert(olist != NULL);
opts = qemu_opts_parse_noisily(olist, args, true);
g_assert(opts != NULL);
parse_sandbox(NULL, opts, &error_abort);
/* Running in a child process */
ret = doit();
if (errnum != 0) {
g_assert(ret != 0);
g_assert(errno == errnum);
} else {
g_assert(ret == 0);
}
_exit(0);
} else {
/* Running in main test process, spawning the child */
g_test_trap_subprocess(NULL, 0, 0);
if (killed) {
g_test_trap_assert_failed();
} else {
g_test_trap_assert_passed();
}
}
}
static void test_seccomp_killed(const char *args, int (*doit)(void))
{
test_seccomp_helper(args, true, 0, doit);
}
static void test_seccomp_errno(const char *args, int errnum, int (*doit)(void))
{
test_seccomp_helper(args, false, errnum, doit);
}
static void test_seccomp_passed(const char *args, int (*doit)(void))
{
test_seccomp_helper(args, false, 0, doit);
}
#ifdef SYS_fork
static int doit_sys_fork(void)
{
int ret = syscall(SYS_fork);
if (ret < 0) {
return ret;
}
if (ret == 0) {
_exit(0);
}
return 0;
}
static void test_seccomp_sys_fork_on_nospawn(void)
{
test_seccomp_killed("on,spawn=deny", doit_sys_fork);
}
static void test_seccomp_sys_fork_on(void)
{
test_seccomp_passed("on", doit_sys_fork);
}
static void test_seccomp_sys_fork_off(void)
{
test_seccomp_passed("off", doit_sys_fork);
}
#endif
static int doit_fork(void)
{
int ret = fork();
if (ret < 0) {
return ret;
}
if (ret == 0) {
_exit(0);
}
return 0;
}
static void test_seccomp_fork_on_nospawn(void)
{
test_seccomp_killed("on,spawn=deny", doit_fork);
}
static void test_seccomp_fork_on(void)
{
test_seccomp_passed("on", doit_fork);
}
static void test_seccomp_fork_off(void)
{
test_seccomp_passed("off", doit_fork);
}
static void *noop(void *arg)
{
return arg;
}
static int doit_thread(void)
{
pthread_t th;
int ret = pthread_create(&th, NULL, noop, NULL);
if (ret != 0) {
errno = ret;
return -1;
} else {
pthread_join(th, NULL);
return 0;
}
}
static void test_seccomp_thread_on(void)
{
test_seccomp_passed("on", doit_thread);
}
static void test_seccomp_thread_on_nospawn(void)
{
test_seccomp_passed("on,spawn=deny", doit_thread);
}
static void test_seccomp_thread_off(void)
{
test_seccomp_passed("off", doit_thread);
}
static int doit_sched(void)
{
struct sched_param param = { .sched_priority = 0 };
return sched_setscheduler(getpid(), SCHED_OTHER, &param);
}
static void test_seccomp_sched_on_nores(void)
{
test_seccomp_errno("on,resourcecontrol=deny", EPERM, doit_sched);
}
static void test_seccomp_sched_on(void)
{
test_seccomp_passed("on", doit_sched);
}
static void test_seccomp_sched_off(void)
{
test_seccomp_passed("off", doit_sched);
}
static bool can_play_with_seccomp(void)
{
g_autofree char *status = NULL;
g_auto(GStrv) lines = NULL;
size_t i;
if (!g_file_get_contents("/proc/self/status", &status, NULL, NULL)) {
return false;
}
lines = g_strsplit(status, "\n", 0);
for (i = 0; lines[i] != NULL; i++) {
if (g_str_has_prefix(lines[i], "Seccomp:")) {
/*
* "Seccomp: 1" or "Seccomp: 2" indicate we're already
* confined, probably as we're inside a container. In
* this case our tests might get unexpected results,
* so we can't run reliably
*/
if (!strchr(lines[i], '0')) {
return false;
}
return true;
}
}
/* Doesn't look like seccomp is enabled in the kernel */
return false;
}
int main(int argc, char **argv)
{
g_test_init(&argc, &argv, NULL);
if (can_play_with_seccomp()) {
#ifdef SYS_fork
g_test_add_func("/softmmu/seccomp/sys-fork/on",
test_seccomp_sys_fork_on);
g_test_add_func("/softmmu/seccomp/sys-fork/on-nospawn",
test_seccomp_sys_fork_on_nospawn);
g_test_add_func("/softmmu/seccomp/sys-fork/off",
test_seccomp_sys_fork_off);
#endif
g_test_add_func("/softmmu/seccomp/fork/on",
test_seccomp_fork_on);
g_test_add_func("/softmmu/seccomp/fork/on-nospawn",
test_seccomp_fork_on_nospawn);
g_test_add_func("/softmmu/seccomp/fork/off",
test_seccomp_fork_off);
g_test_add_func("/softmmu/seccomp/thread/on",
test_seccomp_thread_on);
g_test_add_func("/softmmu/seccomp/thread/on-nospawn",
test_seccomp_thread_on_nospawn);
g_test_add_func("/softmmu/seccomp/thread/off",
test_seccomp_thread_off);
if (doit_sched() == 0) {
/*
* musl doesn't impl sched_setscheduler, hence
* we check above if it works first
*/
g_test_add_func("/softmmu/seccomp/sched/on",
test_seccomp_sched_on);
g_test_add_func("/softmmu/seccomp/sched/on-nores",
test_seccomp_sched_on_nores);
g_test_add_func("/softmmu/seccomp/sched/off",
test_seccomp_sched_off);
}
}
return g_test_run();
}