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 }; 85