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
test_success(void)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.no_lock, true);
29 bpf_program__set_autoload(skel->progs.two_regions, true);
30 bpf_program__set_autoload(skel->progs.non_sleepable_1, true);
31 bpf_program__set_autoload(skel->progs.non_sleepable_2, true);
32 err = rcu_read_lock__load(skel);
33 if (!ASSERT_OK(err, "skel_load"))
34 goto out;
35
36 err = rcu_read_lock__attach(skel);
37 if (!ASSERT_OK(err, "skel_attach"))
38 goto out;
39
40 syscall(SYS_getpgid);
41
42 ASSERT_EQ(skel->bss->task_storage_val, 2, "task_storage_val");
43 ASSERT_EQ(skel->bss->cgroup_id, cgroup_id, "cgroup_id");
44 out:
45 rcu_read_lock__destroy(skel);
46 }
47
test_rcuptr_acquire(void)48 static void test_rcuptr_acquire(void)
49 {
50 struct rcu_read_lock *skel;
51 int err;
52
53 skel = rcu_read_lock__open();
54 if (!ASSERT_OK_PTR(skel, "skel_open"))
55 return;
56
57 skel->bss->target_pid = syscall(SYS_gettid);
58
59 bpf_program__set_autoload(skel->progs.task_acquire, true);
60 err = rcu_read_lock__load(skel);
61 if (!ASSERT_OK(err, "skel_load"))
62 goto out;
63
64 err = rcu_read_lock__attach(skel);
65 ASSERT_OK(err, "skel_attach");
66 out:
67 rcu_read_lock__destroy(skel);
68 }
69
70 static const char * const inproper_region_tests[] = {
71 "miss_lock",
72 "miss_unlock",
73 "non_sleepable_rcu_mismatch",
74 "inproper_sleepable_helper",
75 "inproper_sleepable_kfunc",
76 "nested_rcu_region",
77 };
78
test_inproper_region(void)79 static void test_inproper_region(void)
80 {
81 struct rcu_read_lock *skel;
82 struct bpf_program *prog;
83 int i, err;
84
85 for (i = 0; i < ARRAY_SIZE(inproper_region_tests); i++) {
86 skel = rcu_read_lock__open();
87 if (!ASSERT_OK_PTR(skel, "skel_open"))
88 return;
89
90 prog = bpf_object__find_program_by_name(skel->obj, inproper_region_tests[i]);
91 if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
92 goto out;
93 bpf_program__set_autoload(prog, true);
94 err = rcu_read_lock__load(skel);
95 ASSERT_ERR(err, "skel_load");
96 out:
97 rcu_read_lock__destroy(skel);
98 }
99 }
100
101 static const char * const rcuptr_misuse_tests[] = {
102 "task_untrusted_non_rcuptr",
103 "task_untrusted_rcuptr",
104 "cross_rcu_region",
105 };
106
test_rcuptr_misuse(void)107 static void test_rcuptr_misuse(void)
108 {
109 struct rcu_read_lock *skel;
110 struct bpf_program *prog;
111 int i, err;
112
113 for (i = 0; i < ARRAY_SIZE(rcuptr_misuse_tests); i++) {
114 skel = rcu_read_lock__open();
115 if (!ASSERT_OK_PTR(skel, "skel_open"))
116 return;
117
118 prog = bpf_object__find_program_by_name(skel->obj, rcuptr_misuse_tests[i]);
119 if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
120 goto out;
121 bpf_program__set_autoload(prog, true);
122 err = rcu_read_lock__load(skel);
123 ASSERT_ERR(err, "skel_load");
124 out:
125 rcu_read_lock__destroy(skel);
126 }
127 }
128
test_rcu_read_lock(void)129 void test_rcu_read_lock(void)
130 {
131 struct btf *vmlinux_btf;
132 int cgroup_fd;
133
134 vmlinux_btf = btf__load_vmlinux_btf();
135 if (!ASSERT_OK_PTR(vmlinux_btf, "could not load vmlinux BTF"))
136 return;
137 if (btf__find_by_name_kind(vmlinux_btf, "rcu", BTF_KIND_TYPE_TAG) < 0) {
138 test__skip();
139 goto out;
140 }
141
142 cgroup_fd = test__join_cgroup("/rcu_read_lock");
143 if (!ASSERT_GE(cgroup_fd, 0, "join_cgroup /rcu_read_lock"))
144 goto out;
145
146 cgroup_id = get_cgroup_id("/rcu_read_lock");
147 if (test__start_subtest("success"))
148 test_success();
149 if (test__start_subtest("rcuptr_acquire"))
150 test_rcuptr_acquire();
151 if (test__start_subtest("negative_tests_inproper_region"))
152 test_inproper_region();
153 if (test__start_subtest("negative_tests_rcuptr_misuse"))
154 test_rcuptr_misuse();
155 close(cgroup_fd);
156 out:
157 btf__free(vmlinux_btf);
158 }
159