1 // SPDX-License-Identifier: GPL-2.0
2 #include "vmlinux.h"
3 #include <bpf/bpf_helpers.h>
4 #include <bpf/bpf_tracing.h>
5 #include <bpf/usdt.bpf.h>
6
7 char _license[] SEC("license") = "GPL";
8
9 __u64 uprobe_multi_func_1_addr = 0;
10 __u64 uprobe_multi_func_2_addr = 0;
11 __u64 uprobe_multi_func_3_addr = 0;
12
13 __u64 uprobe_multi_func_1_result = 0;
14 __u64 uprobe_multi_func_2_result = 0;
15 __u64 uprobe_multi_func_3_result = 0;
16
17 __u64 uretprobe_multi_func_1_result = 0;
18 __u64 uretprobe_multi_func_2_result = 0;
19 __u64 uretprobe_multi_func_3_result = 0;
20
21 __u64 uprobe_multi_sleep_result = 0;
22
23 int pid = 0;
24 int child_pid = 0;
25 int child_tid = 0;
26 int child_pid_usdt = 0;
27 int child_tid_usdt = 0;
28
29 int expect_pid = 0;
30 bool bad_pid_seen = false;
31 bool bad_pid_seen_usdt = false;
32
33 bool test_cookie = false;
34 void *user_ptr = 0;
35
36 static __always_inline bool verify_sleepable_user_copy(void)
37 {
38 char data[9];
39
40 bpf_copy_from_user(data, sizeof(data), user_ptr);
41 return bpf_strncmp(data, sizeof(data), "test_data") == 0;
42 }
43
44 static void uprobe_multi_check(void *ctx, bool is_return, bool is_sleep)
45 {
46 __u64 cur_pid_tgid = bpf_get_current_pid_tgid();
47 __u32 cur_pid;
48
49 cur_pid = cur_pid_tgid >> 32;
50 if (pid && cur_pid != pid)
51 return;
52
53 if (expect_pid && cur_pid != expect_pid)
54 bad_pid_seen = true;
55
56 child_pid = cur_pid_tgid >> 32;
57 child_tid = (__u32)cur_pid_tgid;
58
59 __u64 cookie = test_cookie ? bpf_get_attach_cookie(ctx) : 0;
60 __u64 addr = bpf_get_func_ip(ctx);
61
62 #define SET(__var, __addr, __cookie) ({ \
63 if (addr == __addr && \
64 (!test_cookie || (cookie == __cookie))) \
65 __var += 1; \
66 })
67
68 if (is_return) {
69 SET(uretprobe_multi_func_1_result, uprobe_multi_func_1_addr, 2);
70 SET(uretprobe_multi_func_2_result, uprobe_multi_func_2_addr, 3);
71 SET(uretprobe_multi_func_3_result, uprobe_multi_func_3_addr, 1);
72 } else {
73 SET(uprobe_multi_func_1_result, uprobe_multi_func_1_addr, 3);
74 SET(uprobe_multi_func_2_result, uprobe_multi_func_2_addr, 1);
75 SET(uprobe_multi_func_3_result, uprobe_multi_func_3_addr, 2);
76 }
77
78 #undef SET
79
80 if (is_sleep && verify_sleepable_user_copy())
81 uprobe_multi_sleep_result += 1;
82 }
83
84 SEC("uprobe.multi//proc/self/exe:uprobe_multi_func_*")
85 int uprobe(struct pt_regs *ctx)
86 {
87 uprobe_multi_check(ctx, false, false);
88 return 0;
89 }
90
91 SEC("uretprobe.multi//proc/self/exe:uprobe_multi_func_*")
92 int uretprobe(struct pt_regs *ctx)
93 {
94 uprobe_multi_check(ctx, true, false);
95 return 0;
96 }
97
98 SEC("uprobe.multi.s//proc/self/exe:uprobe_multi_func_*")
99 int uprobe_sleep(struct pt_regs *ctx)
100 {
101 uprobe_multi_check(ctx, false, true);
102 return 0;
103 }
104
105 SEC("uretprobe.multi.s//proc/self/exe:uprobe_multi_func_*")
106 int uretprobe_sleep(struct pt_regs *ctx)
107 {
108 uprobe_multi_check(ctx, true, true);
109 return 0;
110 }
111
112 SEC("uprobe.multi//proc/self/exe:uprobe_multi_func_*")
113 int uprobe_extra(struct pt_regs *ctx)
114 {
115 /* we need this one just to mix PID-filtered and global uprobes */
116 return 0;
117 }
118
119 SEC("usdt")
120 int usdt_pid(struct pt_regs *ctx)
121 {
122 __u64 cur_pid_tgid = bpf_get_current_pid_tgid();
123 __u32 cur_pid;
124
125 cur_pid = cur_pid_tgid >> 32;
126 if (pid && cur_pid != pid)
127 return 0;
128
129 if (expect_pid && cur_pid != expect_pid)
130 bad_pid_seen_usdt = true;
131
132 child_pid_usdt = cur_pid_tgid >> 32;
133 child_tid_usdt = (__u32)cur_pid_tgid;
134
135 return 0;
136 }
137
138 SEC("usdt")
139 int usdt_extra(struct pt_regs *ctx)
140 {
141 /* we need this one just to mix PID-filtered and global USDT probes */
142 return 0;
143 }
144
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