perf/tests/openat-syscall.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <errno.h>
0003 #include <inttypes.h>
0004 #include <api/fs/tracing_path.h>
0005 #include <linux/err.h>
0006 #include <linux/string.h>
0007 #include <sys/types.h>
0008 #include <sys/stat.h>
0009 #include <fcntl.h>
0010 #include "thread_map.h"
0011 #include "evsel.h"
0012 #include "debug.h"
0013 #include "tests.h"
0014 #include "util/counts.h"
0015
0016 static int test__openat_syscall_event(struct test_suite *test __maybe_unused,
0017                       int subtest __maybe_unused)
0018 {
0019     int err = TEST_FAIL, fd;
0020     struct evsel *evsel;
0021     unsigned int nr_openat_calls = 111, i;
0022     struct perf_thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX);
0023     char sbuf[STRERR_BUFSIZE];
0024     char errbuf[BUFSIZ];
0025
0026     if (threads == NULL) {
0027         pr_debug("thread_map__new\n");
0028         return TEST_FAIL;
0029     }
0030
0031     evsel = evsel__newtp("syscalls", "sys_enter_openat");
0032     if (IS_ERR(evsel)) {
0033         tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat");
0034         pr_debug("%s\n", errbuf);
0035         err = TEST_SKIP;
0036         goto out_thread_map_delete;
0037     }
0038
0039     if (evsel__open_per_thread(evsel, threads) < 0) {
0040         pr_debug("failed to open counter: %s, "
0041              "tweak /proc/sys/kernel/perf_event_paranoid?\n",
0042              str_error_r(errno, sbuf, sizeof(sbuf)));
0043         err = TEST_SKIP;
0044         goto out_evsel_delete;
0045     }
0046
0047     for (i = 0; i < nr_openat_calls; ++i) {
0048         fd = openat(0, "/etc/passwd", O_RDONLY);
0049         close(fd);
0050     }
0051
0052     if (evsel__read_on_cpu(evsel, 0, 0) < 0) {
0053         pr_debug("evsel__read_on_cpu\n");
0054         goto out_close_fd;
0055     }
0056
0057     if (perf_counts(evsel->counts, 0, 0)->val != nr_openat_calls) {
0058         pr_debug("evsel__read_on_cpu: expected to intercept %d calls, got %" PRIu64 "\n",
0059              nr_openat_calls, perf_counts(evsel->counts, 0, 0)->val);
0060         goto out_close_fd;
0061     }
0062
0063     err = TEST_OK;
0064 out_close_fd:
0065     perf_evsel__close_fd(&evsel->core);
0066 out_evsel_delete:
0067     evsel__delete(evsel);
0068 out_thread_map_delete:
0069     perf_thread_map__put(threads);
0070     return err;
0071 }
0072
0073 static struct test_case tests__openat_syscall_event[] = {
0074     TEST_CASE_REASON("Detect openat syscall event",
0075              openat_syscall_event,
0076              "permissions"),
0077     {   .name = NULL, }
0078 };
0079
0080 struct test_suite suite__openat_syscall_event = {
0081     .desc = "Detect openat syscall event",
0082     .test_cases = tests__openat_syscall_event,
0083 };