1// SPDX-License-Identifier: GPL-2.0
2#include <linux/bpf.h>
3#include <bpf/bpf_helpers.h>
4#include <bpf/bpf_tracing.h>
5#include <stdbool.h>
6
7char _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
23int pid = 0;
24int child_pid = 0;
25
26bool test_cookie = false;
27void *user_ptr = 0;
28
29static __always_inline bool verify_sleepable_user_copy(void)
30{
31	char data[9];
32
33	bpf_copy_from_user(data, sizeof(data), user_ptr);
34	return bpf_strncmp(data, sizeof(data), "test_data") == 0;
35}
36
37static void uprobe_multi_check(void *ctx, bool is_return, bool is_sleep)
38{
39	child_pid = bpf_get_current_pid_tgid() >> 32;
40
41	if (pid && child_pid != pid)
42		return;
43
44	__u64 cookie = test_cookie ? bpf_get_attach_cookie(ctx) : 0;
45	__u64 addr = bpf_get_func_ip(ctx);
46
47#define SET(__var, __addr, __cookie) ({			\
48	if (addr == __addr &&				\
49	   (!test_cookie || (cookie == __cookie)))	\
50		__var += 1;				\
51})
52
53	if (is_return) {
54		SET(uretprobe_multi_func_1_result, uprobe_multi_func_1_addr, 2);
55		SET(uretprobe_multi_func_2_result, uprobe_multi_func_2_addr, 3);
56		SET(uretprobe_multi_func_3_result, uprobe_multi_func_3_addr, 1);
57	} else {
58		SET(uprobe_multi_func_1_result, uprobe_multi_func_1_addr, 3);
59		SET(uprobe_multi_func_2_result, uprobe_multi_func_2_addr, 1);
60		SET(uprobe_multi_func_3_result, uprobe_multi_func_3_addr, 2);
61	}
62
63#undef SET
64
65	if (is_sleep && verify_sleepable_user_copy())
66		uprobe_multi_sleep_result += 1;
67}
68
69SEC("uprobe.multi//proc/self/exe:uprobe_multi_func_*")
70int uprobe(struct pt_regs *ctx)
71{
72	uprobe_multi_check(ctx, false, false);
73	return 0;
74}
75
76SEC("uretprobe.multi//proc/self/exe:uprobe_multi_func_*")
77int uretprobe(struct pt_regs *ctx)
78{
79	uprobe_multi_check(ctx, true, false);
80	return 0;
81}
82
83SEC("uprobe.multi.s//proc/self/exe:uprobe_multi_func_*")
84int uprobe_sleep(struct pt_regs *ctx)
85{
86	uprobe_multi_check(ctx, false, true);
87	return 0;
88}
89
90SEC("uretprobe.multi.s//proc/self/exe:uprobe_multi_func_*")
91int uretprobe_sleep(struct pt_regs *ctx)
92{
93	uprobe_multi_check(ctx, true, true);
94	return 0;
95}
96
97SEC("uprobe.multi//proc/self/exe:uprobe_multi_func_*")
98int uprobe_extra(struct pt_regs *ctx)
99{
100	return 0;
101}
102