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 }; 84