1 // SPDX-License-Identifier: GPL-2.0
2 #include <errno.h>
3 #include <inttypes.h>
4 #include <api/fs/tracing_path.h>
5 #include <linux/err.h>
6 #include <linux/string.h>
7 #include <sys/types.h>
8 #include <sys/stat.h>
9 #include <fcntl.h>
10 #include <unistd.h>
11 #include "thread_map.h"
12 #include "evsel.h"
13 #include "debug.h"
14 #include "tests.h"
15 #include "util/counts.h"
16 
17 static int test__openat_syscall_event(struct test_suite *test __maybe_unused,
18 				      int subtest __maybe_unused)
19 {
20 	int err = TEST_FAIL, fd;
21 	struct evsel *evsel;
22 	unsigned int nr_openat_calls = 111, i;
23 	struct perf_thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX);
24 	char sbuf[STRERR_BUFSIZE];
25 	char errbuf[BUFSIZ];
26 
27 	if (threads == NULL) {
28 		pr_debug("thread_map__new\n");
29 		return TEST_FAIL;
30 	}
31 
32 	evsel = evsel__newtp("syscalls", "sys_enter_openat");
33 	if (IS_ERR(evsel)) {
34 		tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat");
35 		pr_debug("%s\n", errbuf);
36 		err = TEST_SKIP;
37 		goto out_thread_map_delete;
38 	}
39 
40 	if (evsel__open_per_thread(evsel, threads) < 0) {
41 		pr_debug("failed to open counter: %s, "
42 			 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
43 			 str_error_r(errno, sbuf, sizeof(sbuf)));
44 		err = TEST_SKIP;
45 		goto out_evsel_delete;
46 	}
47 
48 	for (i = 0; i < nr_openat_calls; ++i) {
49 		fd = openat(0, "/etc/passwd", O_RDONLY);
50 		close(fd);
51 	}
52 
53 	if (evsel__read_on_cpu(evsel, 0, 0) < 0) {
54 		pr_debug("evsel__read_on_cpu\n");
55 		goto out_close_fd;
56 	}
57 
58 	if (perf_counts(evsel->counts, 0, 0)->val != nr_openat_calls) {
59 		pr_debug("evsel__read_on_cpu: expected to intercept %d calls, got %" PRIu64 "\n",
60 			 nr_openat_calls, perf_counts(evsel->counts, 0, 0)->val);
61 		goto out_close_fd;
62 	}
63 
64 	err = TEST_OK;
65 out_close_fd:
66 	perf_evsel__close_fd(&evsel->core);
67 out_evsel_delete:
68 	evsel__delete(evsel);
69 out_thread_map_delete:
70 	perf_thread_map__put(threads);
71 	return err;
72 }
73 
74 static struct test_case tests__openat_syscall_event[] = {
75 	TEST_CASE_REASON("Detect openat syscall event",
76 			 openat_syscall_event,
77 			 "permissions"),
78 	{	.name = NULL, }
79 };
80 
81 struct test_suite suite__openat_syscall_event = {
82 	.desc = "Detect openat syscall event",
83 	.test_cases = tests__openat_syscall_event,
84 };
85