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")
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")
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")
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")
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")
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")
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")
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