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 <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 };