uprobe_multi_session_cookie.c

 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
 8char _license[] SEC("license") = "GPL";
 9
10int pid = 0;
11
12__u64 test_uprobe_1_result = 0;
13__u64 test_uprobe_2_result = 0;
14__u64 test_uprobe_3_result = 0;
15
16static int check_cookie(__u64 val, __u64 *result)
17{
18	__u64 *cookie;
19
20	if (bpf_get_current_pid_tgid() >> 32 != pid)
21		return 1;
22
23	cookie = bpf_session_cookie();
24
25	if (bpf_session_is_return())
26		*result = *cookie == val ? val : 0;
27	else
28		*cookie = val;
29	return 0;
30}
31
32SEC("uprobe.session//proc/self/exe:uprobe_multi_func_1")
33int uprobe_1(struct pt_regs *ctx)
34{
35	return check_cookie(1, &test_uprobe_1_result);
36}
37
38SEC("uprobe.session//proc/self/exe:uprobe_multi_func_2")
39int uprobe_2(struct pt_regs *ctx)
40{
41	return check_cookie(2, &test_uprobe_2_result);
42}
43
44SEC("uprobe.session//proc/self/exe:uprobe_multi_func_3")
45int uprobe_3(struct pt_regs *ctx)
46{
47	return check_cookie(3, &test_uprobe_3_result);
48}