1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2025 Meta Platforms, Inc. and affiliates. */
3
4 #include <errno.h>
5 #include <fcntl.h>
6 #include <sys/stat.h>
7 #include <string.h>
8 #include <unistd.h>
9 #include <sys/socket.h>
10 #include <test_progs.h>
11 #include "cgroup_helpers.h"
12
13 #include "read_cgroupfs_xattr.skel.h"
14 #include "cgroup_read_xattr.skel.h"
15
16 #define CGROUP_FS_PARENT "foo/"
17 #define CGROUP_FS_CHILD CGROUP_FS_PARENT "bar/"
18 #define TMP_FILE "/tmp/selftests_cgroup_xattr"
19
20 static const char xattr_value_a[] = "bpf_selftest_value_a";
21 static const char xattr_value_b[] = "bpf_selftest_value_b";
22 static const char xattr_name[] = "user.bpf_test";
23
test_read_cgroup_xattr(void)24 static void test_read_cgroup_xattr(void)
25 {
26 int tmp_fd, parent_cgroup_fd = -1, child_cgroup_fd = -1;
27 struct read_cgroupfs_xattr *skel = NULL;
28
29 parent_cgroup_fd = test__join_cgroup(CGROUP_FS_PARENT);
30 if (!ASSERT_OK_FD(parent_cgroup_fd, "create parent cgroup"))
31 return;
32 if (!ASSERT_OK(set_cgroup_xattr(CGROUP_FS_PARENT, xattr_name, xattr_value_a),
33 "set parent xattr"))
34 goto out;
35
36 child_cgroup_fd = test__join_cgroup(CGROUP_FS_CHILD);
37 if (!ASSERT_OK_FD(child_cgroup_fd, "create child cgroup"))
38 goto out;
39 if (!ASSERT_OK(set_cgroup_xattr(CGROUP_FS_CHILD, xattr_name, xattr_value_b),
40 "set child xattr"))
41 goto out;
42
43 skel = read_cgroupfs_xattr__open_and_load();
44 if (!ASSERT_OK_PTR(skel, "read_cgroupfs_xattr__open_and_load"))
45 goto out;
46
47 skel->bss->target_pid = gettid();
48
49 if (!ASSERT_OK(read_cgroupfs_xattr__attach(skel), "read_cgroupfs_xattr__attach"))
50 goto out;
51
52 tmp_fd = open(TMP_FILE, O_RDONLY | O_CREAT);
53 ASSERT_OK_FD(tmp_fd, "open tmp file");
54 close(tmp_fd);
55
56 ASSERT_TRUE(skel->bss->found_value_a, "found_value_a");
57 ASSERT_TRUE(skel->bss->found_value_b, "found_value_b");
58
59 out:
60 close(child_cgroup_fd);
61 close(parent_cgroup_fd);
62 read_cgroupfs_xattr__destroy(skel);
63 unlink(TMP_FILE);
64 }
65
test_cgroup_xattr(void)66 void test_cgroup_xattr(void)
67 {
68 RUN_TESTS(cgroup_read_xattr);
69
70 if (test__start_subtest("read_cgroupfs_xattr"))
71 test_read_cgroup_xattr();
72 }
73