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#include <unistd.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <limits.h>
#include "zdtmtst.h"
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
const char *test_doc = "Check that some cgroups properties in kernel controllers are preserved";
const char *test_author = "Tycho Andersen <tycho.andersen@canonical.com>";
char *dirname;
TEST_OPTION(dirname, string, "cgroup directory name", 1);
static const char *cgname = "zdtmtst";
int mount_and_add(const char *controller, const char *path, const char *prop, const char *value)
{
char aux[1024], paux[1024], subdir[1024];
if (mkdir(dirname, 0700) < 0 && errno != EEXIST) {
pr_perror("Can't make dir");
return -1;
}
sprintf(subdir, "%s/%s", dirname, controller);
if (mkdir(subdir, 0700) < 0) {
pr_perror("Can't make dir");
return -1;
}
if (mount("none", subdir, "cgroup", 0, controller)) {
pr_perror("Can't mount cgroups");
goto err_rd;
}
ssprintf(paux, "%s/%s", subdir, path);
mkdir(paux, 0600);
ssprintf(paux, "%s/%s/%s", subdir, path, prop);
if (write_value(paux, value) < 0)
goto err_rs;
sprintf(aux, "%d", getpid());
ssprintf(paux, "%s/%s/tasks", subdir, path);
if (write_value(paux, aux) < 0)
goto err_rs;
ssprintf(paux, "%s/%s/special_prop_check", subdir, path);
mkdir(paux, 0600);
return 0;
err_rs:
umount(dirname);
err_rd:
rmdir(dirname);
return -1;
}
bool checkval(char *path, char *val)
{
char buf[1024];
int fd, n;
fd = open(path, O_RDONLY);
if (fd < 0) {
pr_perror("open %s", path);
return false;
}
n = read(fd, buf, sizeof(buf) - 1);
close(fd);
if (n < 0) {
pr_perror("read");
return false;
}
buf[n] = 0;
if (strcmp(val, buf)) {
pr_err("got %s expected %s\n", buf, val);
return false;
}
return true;
}
int main(int argc, char **argv)
{
int ret = -1, i;
char buf[1024], path[PATH_MAX];
struct stat sb;
char *dev_allow[] = {
"c *:* m", "b *:* m", "c 1:3 rwm", "c 1:5 rwm", "c 1:7 rwm", "c 5:0 rwm",
"c 5:2 rwm", "c 1:8 rwm", "c 1:9 rwm", "c 136:* rwm", "c 10:229 rwm",
};
test_init(argc, argv);
if (mount_and_add("devices", cgname, "devices.deny", "a") < 0)
goto out;
/* need to allow /dev/null for restore */
sprintf(path, "%s/devices/%s/devices.allow", dirname, cgname);
for (i = 0; i < ARRAY_SIZE(dev_allow); i++) {
if (write_value(path, dev_allow[i]) < 0)
goto out;
}
if (mount_and_add("memory", cgname, "memory.limit_in_bytes", "268435456") < 0)
goto out;
test_daemon();
test_waitsig();
buf[0] = 0;
for (i = 0; i < ARRAY_SIZE(dev_allow); i++) {
strcat(buf, dev_allow[i]);
strcat(buf, "\n");
}
sprintf(path, "%s/devices/%s/devices.list", dirname, cgname);
if (!checkval(path, buf)) {
fail();
goto out;
}
sprintf(path, "%s/memory/%s/memory.limit_in_bytes", dirname, cgname);
if (!checkval(path, "268435456\n")) {
fail();
goto out;
}
sprintf(path, "%s/devices/%s/special_prop_check", dirname, cgname);
if (stat(path, &sb) < 0) {
fail("special_prop_check doesn't exist?");
goto out;
}
if (!S_ISDIR(sb.st_mode)) {
fail("special_prop_check not a directory?");
goto out;
}
pass();
ret = 0;
out:
sprintf(path, "%s/devices/%s/special_prop_check", dirname, cgname);
rmdir(path);
sprintf(path, "%s/devices/%s", dirname, cgname);
rmdir(path);
sprintf(path, "%s/devices", dirname);
umount(path);
sprintf(path, "%s/memory/%s", dirname, cgname);
rmdir(path);
sprintf(path, "%s/memory", dirname);
umount(path);
return ret;
}
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