1 // SPDX-License-Identifier: GPL-2.0
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
10 pid_t my_pid = 0;
11 __u32 cnt_stat = 0;
12 __u32 cnt_close = 0;
13 char paths_stat[MAX_FILES][MAX_PATH_LEN] = {};
14 char paths_close[MAX_FILES][MAX_PATH_LEN] = {};
15 int rets_stat[MAX_FILES] = {};
16 int rets_close[MAX_FILES] = {};
17
18 int called_stat = 0;
19 int called_close = 0;
20
21 SEC("fentry/security_inode_getattr")
BPF_PROG(prog_stat,struct path * path,struct kstat * stat,__u32 request_mask,unsigned int query_flags)22 int 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
43 SEC("fentry/filp_close")
BPF_PROG(prog_close,struct file * file,void * id)44 int 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
65 char _license[] SEC("license") = "GPL";
66