1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2022 Meta Platforms, Inc. and affiliates.*/
3
4 #define _GNU_SOURCE
5 #include <unistd.h>
6 #include <sys/syscall.h>
7 #include <sys/types.h>
8 #include <test_progs.h>
9 #include <bpf/btf.h>
10 #include "rcu_read_lock.skel.h"
11 #include "cgroup_helpers.h"
12
13 static unsigned long long cgroup_id;
14
15 static void test_success(void)
16 {
17 struct rcu_read_lock *skel;
18 int err;
19
20 skel = rcu_read_lock__open();
21 if (!ASSERT_OK_PTR(skel, "skel_open"))
22 return;
23
24 skel->bss->target_pid = syscall(SYS_gettid);
25
26 bpf_program__set_autoload(skel->progs.get_cgroup_id, true);
27 bpf_program__set_autoload(skel->progs.task_succ, true);
28 bpf_program__set_autoload(skel->progs.two_regions, true);
29 bpf_program__set_autoload(skel->progs.non_sleepable_1, true);
30 bpf_program__set_autoload(skel->progs.non_sleepable_2, true);
31 bpf_program__set_autoload(skel->progs.task_trusted_non_rcuptr, true);
32 bpf_program__set_autoload(skel->progs.rcu_read_lock_subprog, true);
33 bpf_program__set_autoload(skel->progs.rcu_read_lock_global_subprog, true);
34 bpf_program__set_autoload(skel->progs.rcu_read_lock_subprog_lock, true);
35 bpf_program__set_autoload(skel->progs.rcu_read_lock_subprog_unlock, true);
36 err = rcu_read_lock__load(skel);
37 if (!ASSERT_OK(err, "skel_load"))
38 goto out;
39
40 err = rcu_read_lock__attach(skel);
41 if (!ASSERT_OK(err, "skel_attach"))
42 goto out;
43
44 syscall(SYS_getpgid);
45
46 ASSERT_EQ(skel->bss->task_storage_val, 2, "task_storage_val");
47 ASSERT_EQ(skel->bss->cgroup_id, cgroup_id, "cgroup_id");
48 out:
49 rcu_read_lock__destroy(skel);
50 }
51
52 static void test_rcuptr_acquire(void)
53 {
54 struct rcu_read_lock *skel;
55 int err;
56
57 skel = rcu_read_lock__open();
58 if (!ASSERT_OK_PTR(skel, "skel_open"))
59 return;
60
61 skel->bss->target_pid = syscall(SYS_gettid);
62
63 bpf_program__set_autoload(skel->progs.task_acquire, true);
64 err = rcu_read_lock__load(skel);
65 if (!ASSERT_OK(err, "skel_load"))
66 goto out;
67
68 err = rcu_read_lock__attach(skel);
69 ASSERT_OK(err, "skel_attach");
70 out:
71 rcu_read_lock__destroy(skel);
72 }
73
74 static const char * const inproper_region_tests[] = {
75 "miss_lock",
76 "no_lock",
77 "miss_unlock",
78 "non_sleepable_rcu_mismatch",
79 "inproper_sleepable_helper",
80 "inproper_sleepable_kfunc",
81 "nested_rcu_region",
82 "rcu_read_lock_global_subprog_lock",
83 "rcu_read_lock_global_subprog_unlock",
84 };
85
86 static void test_inproper_region(void)
87 {
88 struct rcu_read_lock *skel;
89 struct bpf_program *prog;
90 int i, err;
91
92 for (i = 0; i < ARRAY_SIZE(inproper_region_tests); i++) {
93 skel = rcu_read_lock__open();
94 if (!ASSERT_OK_PTR(skel, "skel_open"))
95 return;
96
97 prog = bpf_object__find_program_by_name(skel->obj, inproper_region_tests[i]);
98 if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
99 goto out;
100 bpf_program__set_autoload(prog, true);
101 err = rcu_read_lock__load(skel);
102 ASSERT_ERR(err, "skel_load");
103 out:
104 rcu_read_lock__destroy(skel);
105 }
106 }
107
108 static const char * const rcuptr_misuse_tests[] = {
109 "task_untrusted_rcuptr",
110 "cross_rcu_region",
111 };
112
113 static void test_rcuptr_misuse(void)
114 {
115 struct rcu_read_lock *skel;
116 struct bpf_program *prog;
117 int i, err;
118
119 for (i = 0; i < ARRAY_SIZE(rcuptr_misuse_tests); i++) {
120 skel = rcu_read_lock__open();
121 if (!ASSERT_OK_PTR(skel, "skel_open"))
122 return;
123
124 prog = bpf_object__find_program_by_name(skel->obj, rcuptr_misuse_tests[i]);
125 if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
126 goto out;
127 bpf_program__set_autoload(prog, true);
128 err = rcu_read_lock__load(skel);
129 ASSERT_ERR(err, "skel_load");
130 out:
131 rcu_read_lock__destroy(skel);
132 }
133 }
134
135 void test_rcu_read_lock(void)
136 {
137 int cgroup_fd;
138
139 cgroup_fd = test__join_cgroup("/rcu_read_lock");
140 if (!ASSERT_GE(cgroup_fd, 0, "join_cgroup /rcu_read_lock"))
141 goto out;
142
143 cgroup_id = get_cgroup_id("/rcu_read_lock");
144 if (test__start_subtest("success"))
145 test_success();
146 if (test__start_subtest("rcuptr_acquire"))
147 test_rcuptr_acquire();
148 if (test__start_subtest("negative_tests_inproper_region"))
149 test_inproper_region();
150 if (test__start_subtest("negative_tests_rcuptr_misuse"))
151 test_rcuptr_misuse();
152 close(cgroup_fd);
153 out:;
154 }
155
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