85 lines · c
1// SPDX-License-Identifier: GPL-2.02#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(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