1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2021 Facebook */
3
4 #include "vmlinux.h"
5 #include <bpf/bpf_helpers.h>
6 #include <bpf/bpf_tracing.h>
7 #include <errno.h>
8
9 int my_tid;
10
11 __u64 kprobe_res;
12 __u64 kprobe_multi_res;
13 __u64 kretprobe_res;
14 __u64 uprobe_res;
15 __u64 uretprobe_res;
16 __u64 tp_res;
17 __u64 pe_res;
18 __u64 raw_tp_res;
19 __u64 tp_btf_res;
20 __u64 fentry_res;
21 __u64 fexit_res;
22 __u64 fmod_ret_res;
23 __u64 lsm_res;
24
25 static void update(void *ctx, __u64 *res)
26 {
27 if (my_tid != (u32)bpf_get_current_pid_tgid())
28 return;
29
30 *res |= bpf_get_attach_cookie(ctx);
31 }
32
33 SEC("kprobe")
34 int handle_kprobe(struct pt_regs *ctx)
35 {
36 update(ctx, &kprobe_res);
37 return 0;
38 }
39
40 SEC("kretprobe")
41 int handle_kretprobe(struct pt_regs *ctx)
42 {
43 update(ctx, &kretprobe_res);
44 return 0;
45 }
46
47 SEC("uprobe")
48 int handle_uprobe(struct pt_regs *ctx)
49 {
50 update(ctx, &uprobe_res);
51 return 0;
52 }
53
54 SEC("uretprobe")
55 int handle_uretprobe(struct pt_regs *ctx)
56 {
57 update(ctx, &uretprobe_res);
58 return 0;
59 }
60
61 /* bpf_prog_array, used by kernel internally to keep track of attached BPF
62 * programs to a given BPF hook (e.g., for tracepoints) doesn't allow the same
63 * BPF program to be attached multiple times. So have three identical copies
64 * ready to attach to the same tracepoint.
65 */
66 SEC("tp/syscalls/sys_enter_nanosleep")
67 int handle_tp1(struct pt_regs *ctx)
68 {
69 update(ctx, &tp_res);
70 return 0;
71 }
72 SEC("tp/syscalls/sys_enter_nanosleep")
73 int handle_tp2(struct pt_regs *ctx)
74 {
75 update(ctx, &tp_res);
76 return 0;
77 }
78 SEC("tp/syscalls/sys_enter_nanosleep")
79 int handle_tp3(void *ctx)
80 {
81 update(ctx, &tp_res);
82 return 1;
83 }
84
85 SEC("perf_event")
86 int handle_pe(struct pt_regs *ctx)
87 {
88 update(ctx, &pe_res);
89 return 0;
90 }
91
92 SEC("raw_tp/sys_enter")
93 int handle_raw_tp(void *ctx)
94 {
95 update(ctx, &raw_tp_res);
96 return 0;
97 }
98
99 SEC("tp_btf/sys_enter")
100 int handle_tp_btf(void *ctx)
101 {
102 update(ctx, &tp_btf_res);
103 return 0;
104 }
105
106 SEC("fentry/bpf_fentry_test1")
107 int BPF_PROG(fentry_test1, int a)
108 {
109 update(ctx, &fentry_res);
110 return 0;
111 }
112
113 SEC("fexit/bpf_fentry_test1")
114 int BPF_PROG(fexit_test1, int a, int ret)
115 {
116 update(ctx, &fexit_res);
117 return 0;
118 }
119
120 SEC("fmod_ret/bpf_modify_return_test")
121 int BPF_PROG(fmod_ret_test, int _a, int *_b, int _ret)
122 {
123 update(ctx, &fmod_ret_res);
124 return 1234;
125 }
126
127 SEC("lsm/file_mprotect")
128 int BPF_PROG(test_int_hook, struct vm_area_struct *vma,
129 unsigned long reqprot, unsigned long prot, int ret)
130 {
131 if (my_tid != (u32)bpf_get_current_pid_tgid())
132 return ret;
133 update(ctx, &lsm_res);
134 return -EPERM;
135 }
136
137 char _license[] SEC("license") = "GPL";
138
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