1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
3
4 #include <vmlinux.h>
5 #include <bpf/bpf_tracing.h>
6 #include <bpf/bpf_helpers.h>
7 #include "bpf_misc.h"
8
9 #include "cpumask_common.h"
10
11 char _license[] SEC("license") = "GPL";
12
13 /* Prototype for all of the program trace events below:
14 *
15 * TRACE_EVENT(task_newtask,
16 * TP_PROTO(struct task_struct *p, u64 clone_flags)
17 */
18
19 SEC("tp_btf/task_newtask")
20 __failure __msg("Unreleased reference")
BPF_PROG(test_alloc_no_release,struct task_struct * task,u64 clone_flags)21 int BPF_PROG(test_alloc_no_release, struct task_struct *task, u64 clone_flags)
22 {
23 struct bpf_cpumask *cpumask;
24
25 cpumask = create_cpumask();
26
27 /* cpumask is never released. */
28 return 0;
29 }
30
31 SEC("tp_btf/task_newtask")
32 __failure __msg("NULL pointer passed to trusted arg0")
BPF_PROG(test_alloc_double_release,struct task_struct * task,u64 clone_flags)33 int BPF_PROG(test_alloc_double_release, struct task_struct *task, u64 clone_flags)
34 {
35 struct bpf_cpumask *cpumask;
36
37 cpumask = create_cpumask();
38
39 /* cpumask is released twice. */
40 bpf_cpumask_release(cpumask);
41 bpf_cpumask_release(cpumask);
42
43 return 0;
44 }
45
46 SEC("tp_btf/task_newtask")
47 __failure __msg("bpf_cpumask_acquire args#0 expected pointer to STRUCT bpf_cpumask")
BPF_PROG(test_acquire_wrong_cpumask,struct task_struct * task,u64 clone_flags)48 int BPF_PROG(test_acquire_wrong_cpumask, struct task_struct *task, u64 clone_flags)
49 {
50 struct bpf_cpumask *cpumask;
51
52 /* Can't acquire a non-struct bpf_cpumask. */
53 cpumask = bpf_cpumask_acquire((struct bpf_cpumask *)task->cpus_ptr);
54
55 return 0;
56 }
57
58 SEC("tp_btf/task_newtask")
59 __failure __msg("bpf_cpumask_set_cpu args#1 expected pointer to STRUCT bpf_cpumask")
BPF_PROG(test_mutate_cpumask,struct task_struct * task,u64 clone_flags)60 int BPF_PROG(test_mutate_cpumask, struct task_struct *task, u64 clone_flags)
61 {
62 struct bpf_cpumask *cpumask;
63
64 /* Can't set the CPU of a non-struct bpf_cpumask. */
65 bpf_cpumask_set_cpu(0, (struct bpf_cpumask *)task->cpus_ptr);
66
67 return 0;
68 }
69
70 SEC("tp_btf/task_newtask")
71 __failure __msg("Unreleased reference")
BPF_PROG(test_insert_remove_no_release,struct task_struct * task,u64 clone_flags)72 int BPF_PROG(test_insert_remove_no_release, struct task_struct *task, u64 clone_flags)
73 {
74 struct bpf_cpumask *cpumask;
75 struct __cpumask_map_value *v;
76
77 cpumask = create_cpumask();
78 if (!cpumask)
79 return 0;
80
81 if (cpumask_map_insert(cpumask))
82 return 0;
83
84 v = cpumask_map_value_lookup();
85 if (!v)
86 return 0;
87
88 cpumask = bpf_kptr_xchg(&v->cpumask, NULL);
89
90 /* cpumask is never released. */
91 return 0;
92 }
93
94 SEC("tp_btf/task_newtask")
95 __failure __msg("Unreleased reference")
BPF_PROG(test_kptr_get_no_release,struct task_struct * task,u64 clone_flags)96 int BPF_PROG(test_kptr_get_no_release, struct task_struct *task, u64 clone_flags)
97 {
98 struct bpf_cpumask *cpumask;
99 struct __cpumask_map_value *v;
100
101 cpumask = create_cpumask();
102 if (!cpumask)
103 return 0;
104
105 if (cpumask_map_insert(cpumask))
106 return 0;
107
108 v = cpumask_map_value_lookup();
109 if (!v)
110 return 0;
111
112 cpumask = bpf_cpumask_kptr_get(&v->cpumask);
113
114 /* cpumask is never released. */
115 return 0;
116 }
117
118 SEC("tp_btf/task_newtask")
119 __failure __msg("NULL pointer passed to trusted arg0")
BPF_PROG(test_cpumask_null,struct task_struct * task,u64 clone_flags)120 int BPF_PROG(test_cpumask_null, struct task_struct *task, u64 clone_flags)
121 {
122 /* NULL passed to KF_TRUSTED_ARGS kfunc. */
123 bpf_cpumask_empty(NULL);
124
125 return 0;
126 }
127