1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <stdbool.h>
#include "bpf_kfuncs.h"
char _license[] SEC("license") = "GPL";
int pid = 0;
__u64 test_kprobe_1_result = 0;
__u64 test_kprobe_2_result = 0;
__u64 test_kprobe_3_result = 0;
/*
* No tests in here, just to trigger 'bpf_fentry_test*'
* through tracing test_run
*/
SEC("fentry/bpf_modify_return_test")
int BPF_PROG(trigger)
{
return 0;
}
static int check_cookie(__u64 val, __u64 *result)
{
__u64 *cookie;
if (bpf_get_current_pid_tgid() >> 32 != pid)
return 1;
cookie = bpf_session_cookie();
if (bpf_session_is_return())
*result = *cookie == val ? val : 0;
else
*cookie = val;
return 0;
}
SEC("kprobe.session/bpf_fentry_test1")
int test_kprobe_1(struct pt_regs *ctx)
{
return check_cookie(1, &test_kprobe_1_result);
}
SEC("kprobe.session/bpf_fentry_test1")
int test_kprobe_2(struct pt_regs *ctx)
{
return check_cookie(2, &test_kprobe_2_result);
}
SEC("kprobe.session/bpf_fentry_test1")
int test_kprobe_3(struct pt_regs *ctx)
{
return check_cookie(3, &test_kprobe_3_result);
}
|
