1// SPDX-License-Identifier: GPL-2.0
 2
 3/*
 4 * Copyright (C) 2020 Google LLC.
 5 */
 6
 7#include <stdio.h>
 8#include <stdlib.h>
 9#include <unistd.h>
10#include <sys/wait.h>
11#include <test_progs.h>
12#include <linux/ring_buffer.h>
13
14#include "ima.skel.h"
15
16static int run_measured_process(const char *measured_dir, u32 *monitored_pid)
17{
18	int child_pid, child_status;
19
20	child_pid = fork();
21	if (child_pid == 0) {
22		*monitored_pid = getpid();
23		execlp("./ima_setup.sh", "./ima_setup.sh", "run", measured_dir,
24		       NULL);
25		exit(errno);
26
27	} else if (child_pid > 0) {
28		waitpid(child_pid, &child_status, 0);
29		return WEXITSTATUS(child_status);
30	}
31
32	return -EINVAL;
33}
34
35static u64 ima_hash_from_bpf;
36
37static int process_sample(void *ctx, void *data, size_t len)
38{
39	ima_hash_from_bpf = *((u64 *)data);
40	return 0;
41}
42
43void test_test_ima(void)
44{
45	char measured_dir_template[] = "/tmp/ima_measuredXXXXXX";
46	struct ring_buffer *ringbuf;
47	const char *measured_dir;
48	char cmd[256];
49
50	int err, duration = 0;
51	struct ima *skel = NULL;
52
53	skel = ima__open_and_load();
54	if (CHECK(!skel, "skel_load", "skeleton failed\n"))
55		goto close_prog;
56
57	ringbuf = ring_buffer__new(bpf_map__fd(skel->maps.ringbuf),
58				   process_sample, NULL, NULL);
59	if (!ASSERT_OK_PTR(ringbuf, "ringbuf"))
60		goto close_prog;
61
62	err = ima__attach(skel);
63	if (CHECK(err, "attach", "attach failed: %d\n", err))
64		goto close_prog;
65
66	measured_dir = mkdtemp(measured_dir_template);
67	if (CHECK(measured_dir == NULL, "mkdtemp", "err %d\n", errno))
68		goto close_prog;
69
70	snprintf(cmd, sizeof(cmd), "./ima_setup.sh setup %s", measured_dir);
71	err = system(cmd);
72	if (CHECK(err, "failed to run command", "%s, errno = %d\n", cmd, errno))
73		goto close_clean;
74
75	err = run_measured_process(measured_dir, &skel->bss->monitored_pid);
76	if (CHECK(err, "run_measured_process", "err = %d\n", err))
77		goto close_clean;
78
79	err = ring_buffer__consume(ringbuf);
80	ASSERT_EQ(err, 1, "num_samples_or_err");
81	ASSERT_NEQ(ima_hash_from_bpf, 0, "ima_hash");
82
83close_clean:
84	snprintf(cmd, sizeof(cmd), "./ima_setup.sh cleanup %s", measured_dir);
85	err = system(cmd);
86	CHECK(err, "failed to run command", "%s, errno = %d\n", cmd, errno);
87close_prog:
88	ima__destroy(skel);
89}