123 lines
2.8 KiB
C
123 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (c) 2014 Red Hat, Inc.
|
|
* Copyright (C) 2021 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
|
|
*/
|
|
|
|
/*\
|
|
* [Description]
|
|
*
|
|
* Tests a slave mount: slave mount is like a shared mount except that
|
|
* mount and umount events only propagate towards it.
|
|
*
|
|
* [Algorithm]
|
|
*
|
|
* - Creates directories DIRA, DIRB and files DIRA/"A", DIRB/"B"
|
|
* - Unshares mount namespace and makes it private (so mounts/umounts have no
|
|
* effect on a real system)
|
|
* - Bind mounts directory DIRA to itself
|
|
* - Makes directory DIRA shared
|
|
* - Clones a new child process with CLONE_NEWNS flag and makes "A" a slave
|
|
* mount
|
|
* - There are two testcases (where X is parent namespace and Y child
|
|
* namespace):
|
|
* 1. First test case
|
|
* .. X: bind mounts DIRB to DIRA
|
|
* .. Y: must see the file DIRA/"B"
|
|
* .. X: umounts DIRA
|
|
* 2. Second test case
|
|
* .. Y: bind mounts DIRB to DIRA
|
|
* .. X: must see only the DIRA/"A" and must not see DIRA/"B" (as slave mount does
|
|
* not forward propagation)
|
|
* .. Y: umounts DIRA
|
|
*/
|
|
|
|
#include <sys/wait.h>
|
|
#include <sys/mount.h>
|
|
#include "mountns.h"
|
|
#include "tst_test.h"
|
|
|
|
static int child_func(LTP_ATTRIBUTE_UNUSED void *arg)
|
|
{
|
|
/*
|
|
* makes mount DIRA a slave of DIRA (all slave mounts have
|
|
* a master mount which is a shared mount)
|
|
*/
|
|
SAFE_MOUNT("none", DIRA, "none", MS_SLAVE, NULL);
|
|
|
|
TST_CHECKPOINT_WAKE_AND_WAIT(0);
|
|
|
|
if (access(DIRA "/B", F_OK) == 0)
|
|
tst_res(TPASS, "propagation to slave mount passed");
|
|
else
|
|
tst_res(TFAIL, "propagation to slave mount failed");
|
|
|
|
TST_CHECKPOINT_WAKE_AND_WAIT(0);
|
|
|
|
SAFE_MOUNT(DIRB, DIRA, "none", MS_BIND, NULL);
|
|
|
|
TST_CHECKPOINT_WAKE_AND_WAIT(0);
|
|
|
|
SAFE_UMOUNT(DIRA);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void run(void)
|
|
{
|
|
int ret;
|
|
|
|
SAFE_UNSHARE(CLONE_NEWNS);
|
|
|
|
/* makes sure parent mounts/umounts have no effect on a real system */
|
|
SAFE_MOUNT("none", "/", "none", MS_REC | MS_PRIVATE, NULL);
|
|
|
|
SAFE_MOUNT(DIRA, DIRA, "none", MS_BIND, NULL);
|
|
|
|
SAFE_MOUNT("none", DIRA, "none", MS_SHARED, NULL);
|
|
|
|
ret = ltp_clone_quick(CLONE_NEWNS | SIGCHLD, child_func, NULL);
|
|
if (ret < 0)
|
|
tst_brk(TBROK, "clone failed");
|
|
|
|
TST_CHECKPOINT_WAIT(0);
|
|
|
|
SAFE_MOUNT(DIRB, DIRA, "none", MS_BIND, NULL);
|
|
|
|
TST_CHECKPOINT_WAKE_AND_WAIT(0);
|
|
|
|
SAFE_UMOUNT(DIRA);
|
|
|
|
TST_CHECKPOINT_WAKE_AND_WAIT(0);
|
|
|
|
if ((access(DIRA "/A", F_OK) == 0) && (access(DIRA "/B", F_OK) == -1))
|
|
tst_res(TPASS, "propagation from slave mount passed");
|
|
else
|
|
tst_res(TFAIL, "propagation form slave mount failed");
|
|
|
|
TST_CHECKPOINT_WAKE(0);
|
|
|
|
SAFE_WAIT(NULL);
|
|
|
|
SAFE_UMOUNT(DIRA);
|
|
}
|
|
|
|
static void setup(void)
|
|
{
|
|
check_newns();
|
|
create_folders();
|
|
}
|
|
|
|
static void cleanup(void)
|
|
{
|
|
umount_folders();
|
|
}
|
|
|
|
static struct tst_test test = {
|
|
.setup = setup,
|
|
.cleanup = cleanup,
|
|
.test_all = run,
|
|
.needs_root = 1,
|
|
.needs_checkpoints = 1,
|
|
};
|