tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
selftests/filesystems: add basic fscontext log tests
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Link: https://lore.kernel.org/20250807-fscontext-log-cleanups-v3-2-8d91d6242dc3@cyphar.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
authored by
Aleksa Sarai
and committed by
Christian Brauner
df579e47
72d271a7
+132
-1
+1
tools/testing/selftests/filesystems/.gitignore
+1
tools/testing/selftests/filesystems/.gitignore
+1
-1
tools/testing/selftests/filesystems/Makefile
+1
-1
tools/testing/selftests/filesystems/Makefile
···
1
1
# SPDX-License-Identifier: GPL-2.0
2
2
3
3
CFLAGS += $(KHDR_INCLUDES)
4
-
TEST_GEN_PROGS := devpts_pts file_stressor anon_inode_test kernfs_test
4
+
TEST_GEN_PROGS := devpts_pts file_stressor anon_inode_test kernfs_test fclog
5
5
TEST_GEN_PROGS_EXTENDED := dnotify_test
6
6
7
7
include ../lib.mk
+130
tools/testing/selftests/filesystems/fclog.c
+130
tools/testing/selftests/filesystems/fclog.c
···
1
+
// SPDX-License-Identifier: GPL-2.0-or-later
2
+
/*
3
+
* Author: Aleksa Sarai <cyphar@cyphar.com>
4
+
* Copyright (C) 2025 SUSE LLC.
5
+
*/
6
+
7
+
#include <assert.h>
8
+
#include <errno.h>
9
+
#include <sched.h>
10
+
#include <stdio.h>
11
+
#include <stdlib.h>
12
+
#include <string.h>
13
+
#include <unistd.h>
14
+
#include <sys/mount.h>
15
+
16
+
#include "../kselftest_harness.h"
17
+
18
+
#define ASSERT_ERRNO(expected, _t, seen) \
19
+
__EXPECT(expected, #expected, \
20
+
({__typeof__(seen) _tmp_seen = (seen); \
21
+
_tmp_seen >= 0 ? _tmp_seen : -errno; }), #seen, _t, 1)
22
+
23
+
#define ASSERT_ERRNO_EQ(expected, seen) \
24
+
ASSERT_ERRNO(expected, ==, seen)
25
+
26
+
#define ASSERT_SUCCESS(seen) \
27
+
ASSERT_ERRNO(0, <=, seen)
28
+
29
+
FIXTURE(ns)
30
+
{
31
+
int host_mntns;
32
+
};
33
+
34
+
FIXTURE_SETUP(ns)
35
+
{
36
+
/* Stash the old mntns. */
37
+
self->host_mntns = open("/proc/self/ns/mnt", O_RDONLY|O_CLOEXEC);
38
+
ASSERT_SUCCESS(self->host_mntns);
39
+
40
+
/* Create a new mount namespace and make it private. */
41
+
ASSERT_SUCCESS(unshare(CLONE_NEWNS));
42
+
ASSERT_SUCCESS(mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL));
43
+
}
44
+
45
+
FIXTURE_TEARDOWN(ns)
46
+
{
47
+
ASSERT_SUCCESS(setns(self->host_mntns, CLONE_NEWNS));
48
+
ASSERT_SUCCESS(close(self->host_mntns));
49
+
}
50
+
51
+
TEST_F(ns, fscontext_log_enodata)
52
+
{
53
+
int fsfd = fsopen("tmpfs", FSOPEN_CLOEXEC);
54
+
ASSERT_SUCCESS(fsfd);
55
+
56
+
/* A brand new fscontext has no log entries. */
57
+
char buf[128] = {};
58
+
for (int i = 0; i < 16; i++)
59
+
ASSERT_ERRNO_EQ(-ENODATA, read(fsfd, buf, sizeof(buf)));
60
+
61
+
ASSERT_SUCCESS(close(fsfd));
62
+
}
63
+
64
+
TEST_F(ns, fscontext_log_errorfc)
65
+
{
66
+
int fsfd = fsopen("tmpfs", FSOPEN_CLOEXEC);
67
+
ASSERT_SUCCESS(fsfd);
68
+
69
+
ASSERT_ERRNO_EQ(-EINVAL, fsconfig(fsfd, FSCONFIG_SET_STRING, "invalid-arg", "123", 0));
70
+
71
+
char buf[128] = {};
72
+
ASSERT_SUCCESS(read(fsfd, buf, sizeof(buf)));
73
+
EXPECT_STREQ("e tmpfs: Unknown parameter 'invalid-arg'\n", buf);
74
+
75
+
/* The message has been consumed. */
76
+
ASSERT_ERRNO_EQ(-ENODATA, read(fsfd, buf, sizeof(buf)));
77
+
ASSERT_SUCCESS(close(fsfd));
78
+
}
79
+
80
+
TEST_F(ns, fscontext_log_errorfc_after_fsmount)
81
+
{
82
+
int fsfd = fsopen("tmpfs", FSOPEN_CLOEXEC);
83
+
ASSERT_SUCCESS(fsfd);
84
+
85
+
ASSERT_ERRNO_EQ(-EINVAL, fsconfig(fsfd, FSCONFIG_SET_STRING, "invalid-arg", "123", 0));
86
+
87
+
ASSERT_SUCCESS(fsconfig(fsfd, FSCONFIG_CMD_CREATE, NULL, NULL, 0));
88
+
int mfd = fsmount(fsfd, FSMOUNT_CLOEXEC, MOUNT_ATTR_NOEXEC | MOUNT_ATTR_NOSUID);
89
+
ASSERT_SUCCESS(mfd);
90
+
ASSERT_SUCCESS(move_mount(mfd, "", AT_FDCWD, "/tmp", MOVE_MOUNT_F_EMPTY_PATH));
91
+
92
+
/*
93
+
* The fscontext log should still contain data even after
94
+
* FSCONFIG_CMD_CREATE and fsmount().
95
+
*/
96
+
char buf[128] = {};
97
+
ASSERT_SUCCESS(read(fsfd, buf, sizeof(buf)));
98
+
EXPECT_STREQ("e tmpfs: Unknown parameter 'invalid-arg'\n", buf);
99
+
100
+
/* The message has been consumed. */
101
+
ASSERT_ERRNO_EQ(-ENODATA, read(fsfd, buf, sizeof(buf)));
102
+
ASSERT_SUCCESS(close(fsfd));
103
+
}
104
+
105
+
TEST_F(ns, fscontext_log_emsgsize)
106
+
{
107
+
int fsfd = fsopen("tmpfs", FSOPEN_CLOEXEC);
108
+
ASSERT_SUCCESS(fsfd);
109
+
110
+
ASSERT_ERRNO_EQ(-EINVAL, fsconfig(fsfd, FSCONFIG_SET_STRING, "invalid-arg", "123", 0));
111
+
112
+
char buf[128] = {};
113
+
/*
114
+
* Attempting to read a message with too small a buffer should not
115
+
* result in the message getting consumed.
116
+
*/
117
+
ASSERT_ERRNO_EQ(-EMSGSIZE, read(fsfd, buf, 0));
118
+
ASSERT_ERRNO_EQ(-EMSGSIZE, read(fsfd, buf, 1));
119
+
for (int i = 0; i < 16; i++)
120
+
ASSERT_ERRNO_EQ(-EMSGSIZE, read(fsfd, buf, 16));
121
+
122
+
ASSERT_SUCCESS(read(fsfd, buf, sizeof(buf)));
123
+
EXPECT_STREQ("e tmpfs: Unknown parameter 'invalid-arg'\n", buf);
124
+
125
+
/* The message has been consumed. */
126
+
ASSERT_ERRNO_EQ(-ENODATA, read(fsfd, buf, sizeof(buf)));
127
+
ASSERT_SUCCESS(close(fsfd));
128
+
}
129
+
130
+
TEST_HARNESS_MAIN