blob: 9633e5f2453dec74fd3c78871b053456f09a7bba (
plain)
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
59
60
61
62
63
64
65
66
67
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2020 Google LLC.
*/
#include "vmlinux.h"
#include <errno.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
u32 monitored_pid = 0;
struct {
__uint(type, BPF_MAP_TYPE_RINGBUF);
__uint(max_entries, 1 << 12);
} ringbuf SEC(".maps");
char _license[] SEC("license") = "GPL";
bool use_ima_file_hash;
bool enable_bprm_creds_for_exec;
static void ima_test_common(struct file *file)
{
u64 ima_hash = 0;
u64 *sample;
int ret;
u32 pid;
pid = bpf_get_current_pid_tgid() >> 32;
if (pid == monitored_pid) {
if (!use_ima_file_hash)
ret = bpf_ima_inode_hash(file->f_inode, &ima_hash,
sizeof(ima_hash));
else
ret = bpf_ima_file_hash(file, &ima_hash,
sizeof(ima_hash));
if (ret < 0 || ima_hash == 0)
return;
sample = bpf_ringbuf_reserve(&ringbuf, sizeof(u64), 0);
if (!sample)
return;
*sample = ima_hash;
bpf_ringbuf_submit(sample, 0);
}
return;
}
SEC("lsm.s/bprm_committed_creds")
void BPF_PROG(bprm_committed_creds, struct linux_binprm *bprm)
{
ima_test_common(bprm->file);
}
SEC("lsm.s/bprm_creds_for_exec")
int BPF_PROG(bprm_creds_for_exec, struct linux_binprm *bprm)
{
if (!enable_bprm_creds_for_exec)
return 0;
ima_test_common(bprm->file);
return 0;
}
|
