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
17static 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(ptr: 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;
65out_close_fd:
66 perf_evsel__close_fd(&evsel->core);
67out_evsel_delete:
68 evsel__delete(evsel);
69out_thread_map_delete:
70 perf_thread_map__put(threads);
71 return err;
72}
73
74static 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
81struct test_suite suite__openat_syscall_event = {
82 .desc = "Detect openat syscall event",
83 .test_cases = tests__openat_syscall_event,
84};
85

source code of linux/tools/perf/tests/openat-syscall.c