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, is_return: false, is_sleep: 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, is_return: true, is_sleep: 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, is_return: false, is_sleep: 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, is_return: true, is_sleep: 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

source code of linux/tools/testing/selftests/bpf/progs/uprobe_multi.c