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// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <sched.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <unistd.h>
#include "../../kselftest_harness.h"
FIXTURE(mntns_cleanup) {
};
FIXTURE_SETUP(mntns_cleanup)
{
if (geteuid() != 0)
SKIP(return, "test requires CAP_SYS_ADMIN");
ASSERT_EQ(unshare(CLONE_NEWNS), 0);
ASSERT_EQ(mount("", "/", NULL, MS_REC | MS_PRIVATE, NULL), 0);
rmdir("/mnt_dir");
ASSERT_EQ(mkdir("/mnt_dir", 0755), 0);
ASSERT_EQ(mount("tmpfs", "/mnt_dir", "tmpfs", 0, NULL), 0);
ASSERT_EQ(mkdir("/mnt_dir/hidden", 0755), 0);
ASSERT_EQ(mkdir("/mnt_dir/hidden/secret", 0755), 0);
ASSERT_EQ(mount("tmpfs", "/mnt_dir/hidden", "tmpfs", 0, NULL), 0);
}
FIXTURE_TEARDOWN(mntns_cleanup)
{
}
/* Mounts must stay connected when a mount namespace is cleaned up. */
TEST_F(mntns_cleanup, keeps_mounts_connected)
{
int fd, sfd, err;
fd = open("/mnt_dir", O_PATH | O_DIRECTORY | O_CLOEXEC);
ASSERT_GE(fd, 0);
/* Destroy the namespace; the fd keeps /mnt_dir alive. */
ASSERT_EQ(unshare(CLONE_NEWNS), 0);
sfd = openat(fd, "hidden/secret", O_RDONLY);
err = errno;
if (sfd >= 0)
close(sfd);
close(fd);
ASSERT_LT(sfd, 0)
TH_LOG("mount namespace teardown revealed what the overmount covered");
ASSERT_EQ(err, ENOENT);
}
TEST_HARNESS_MAIN
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