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#include "bpf_kfuncs.h"
 7#include "bpf_misc.h"
 8
 9char _license[] SEC("license") = "GPL";
10
11__u64 uprobe_multi_func_1_addr = 0;
12__u64 uprobe_multi_func_2_addr = 0;
13__u64 uprobe_multi_func_3_addr = 0;
14
15__u64 uprobe_session_result[3] = {};
16__u64 uprobe_multi_sleep_result = 0;
17
18void *user_ptr = 0;
19int pid = 0;
20
21static int uprobe_multi_check(void *ctx, bool is_return)
22{
23	const __u64 funcs[] = {
24		uprobe_multi_func_1_addr,
25		uprobe_multi_func_2_addr,
26		uprobe_multi_func_3_addr,
27	};
28	unsigned int i;
29	__u64 addr;
30
31	if (bpf_get_current_pid_tgid() >> 32 != pid)
32		return 1;
33
34	addr = bpf_get_func_ip(ctx);
35
36	for (i = 0; i < ARRAY_SIZE(funcs); i++) {
37		if (funcs[i] == addr) {
38			uprobe_session_result[i]++;
39			break;
40		}
41	}
42
43	/* only uprobe_multi_func_2 executes return probe */
44	if ((addr == uprobe_multi_func_1_addr) ||
45	    (addr == uprobe_multi_func_3_addr))
46		return 1;
47
48	return 0;
49}
50
51SEC("uprobe.session//proc/self/exe:uprobe_multi_func_*")
52int uprobe(struct pt_regs *ctx)
53{
54	return uprobe_multi_check(ctx, bpf_session_is_return());
55}
56
57static __always_inline bool verify_sleepable_user_copy(void)
58{
59	char data[9];
60
61	bpf_copy_from_user(data, sizeof(data), user_ptr);
62	return bpf_strncmp(data, sizeof(data), "test_data") == 0;
63}
64
65SEC("uprobe.session.s//proc/self/exe:uprobe_multi_func_*")
66int uprobe_sleepable(struct pt_regs *ctx)
67{
68	if (verify_sleepable_user_copy())
69		uprobe_multi_sleep_result++;
70	return uprobe_multi_check(ctx, bpf_session_is_return());
71}