1
2
3#include "vmlinux.h"
4#include <bpf/bpf_helpers.h>
5#include <bpf/bpf_tracing.h>
6
7#define MAX_PATH_LEN 128
8#define MAX_FILES 7
9
10pid_t my_pid = 0;
11__u32 cnt_stat = 0;
12__u32 cnt_close = 0;
13char paths_stat[MAX_FILES][MAX_PATH_LEN] = {};
14char paths_close[MAX_FILES][MAX_PATH_LEN] = {};
15int rets_stat[MAX_FILES] = {};
16int rets_close[MAX_FILES] = {};
17
18int called_stat = 0;
19int called_close = 0;
20
21SEC("fentry/security_inode_getattr")
22int BPF_PROG(prog_stat, struct path *path, struct kstat *stat,
23 __u32 request_mask, unsigned int query_flags)
24{
25 pid_t pid = bpf_get_current_pid_tgid() >> 32;
26 __u32 cnt = cnt_stat;
27 int ret;
28
29 called_stat = 1;
30
31 if (pid != my_pid)
32 return 0;
33
34 if (cnt >= MAX_FILES)
35 return 0;
36 ret = bpf_d_path(path, paths_stat[cnt], MAX_PATH_LEN);
37
38 rets_stat[cnt] = ret;
39 cnt_stat++;
40 return 0;
41}
42
43SEC("fentry/filp_close")
44int BPF_PROG(prog_close, struct file *file, void *id)
45{
46 pid_t pid = bpf_get_current_pid_tgid() >> 32;
47 __u32 cnt = cnt_close;
48 int ret;
49
50 called_close = 1;
51
52 if (pid != my_pid)
53 return 0;
54
55 if (cnt >= MAX_FILES)
56 return 0;
57 ret = bpf_d_path(&file->f_path,
58 paths_close[cnt], MAX_PATH_LEN);
59
60 rets_close[cnt] = ret;
61 cnt_close++;
62 return 0;
63}
64
65char _license[] SEC("license") = "GPL";
66
