tools/perf/tests/openat-syscall.c

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