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selftests/filesystems: add mntns cleanup test

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Verify that destroying a mount namespace keeps its mounts connected.

Signed-off-by: Noah Orlando <Noah.Orlando@deshaw.com>
Link: https://patch.msgid.link/20260706182559.2496448-4-Noah.Orlando@deshaw.com
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
Noah Orlando
2026-07-06 14:26:01 -04:00
committed by Christian Brauner
parent 0342482a4d
commit 3452eecbcc
4 changed files with 67 additions and 0 deletions
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1
tools/testing/selftests/Makefile
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@@ -42,6 +42,7 @@ TARGETS += filesystems/fuse
TARGETS += filesystems/move_mount
TARGETS += filesystems/empty_mntns
TARGETS += filesystems/fsmount_ns
TARGETS += filesystems/mntns_cleanup
TARGETS += firmware
TARGETS += fpu
TARGETS += ftrace

2
tools/testing/selftests/filesystems/mntns_cleanup/.gitignore vendored Normal file
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@@ -0,0 +1,2 @@
# SPDX-License-Identifier: GPL-2.0-only
mntns_cleanup_test

6
tools/testing/selftests/filesystems/mntns_cleanup/Makefile Normal file
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@@ -0,0 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
TEST_GEN_PROGS := mntns_cleanup_test
CFLAGS += -Wall -O2 -g $(KHDR_INCLUDES)
include ../../lib.mk

58
tools/testing/selftests/filesystems/mntns_cleanup/mntns_cleanup_test.c Normal file
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@@ -0,0 +1,58 @@
// 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