diff options
| -rw-r--r-- | tools/testing/selftests/seccomp/seccomp_bpf.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c index 38839ad939f8..6001e9ecfaf5 100644 --- a/tools/testing/selftests/seccomp/seccomp_bpf.c +++ b/tools/testing/selftests/seccomp/seccomp_bpf.c @@ -4297,6 +4297,115 @@ TEST_F(O_SUSPEND_SECCOMP, seize) ASSERT_EQ(EPERM, errno); } +static char get_proc_stat(int pid) +{ + char proc_path[100] = {0}; + char *line = NULL; + size_t len = 0; + ssize_t nread; + char status; + FILE *f; + int i; + + snprintf(proc_path, sizeof(proc_path), "/proc/%d/stat", pid); + f = fopen(proc_path, "r"); + if (f == NULL) + ksft_exit_fail_msg("%s - Could not open %s\n", + strerror(errno), proc_path); + + for (i = 0; i < 3; i++) { + nread = getdelim(&line, &len, ' ', f); + if (nread <= 0) + ksft_exit_fail_msg("Failed to read status: %s\n", + strerror(errno)); + } + + status = *line; + free(line); + fclose(f); + + return status; +} + +TEST(user_notification_fifo) +{ + struct seccomp_notif_resp resp = {}; + struct seccomp_notif req = {}; + int i, status, listener; + pid_t pid, pids[3]; + __u64 baseid; + long ret; + /* 100 ms */ + struct timespec delay = { .tv_nsec = 100000000 }; + + ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); + ASSERT_EQ(0, ret) { + TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); + } + + /* Setup a listener */ + listener = user_notif_syscall(__NR_getppid, + SECCOMP_FILTER_FLAG_NEW_LISTENER); + ASSERT_GE(listener, 0); + + pid = fork(); + ASSERT_GE(pid, 0); + + if (pid == 0) { + ret = syscall(__NR_getppid); + exit(ret != USER_NOTIF_MAGIC); + } + + EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0); + baseid = req.id + 1; + + resp.id = req.id; + resp.error = 0; + resp.val = USER_NOTIF_MAGIC; + + /* check that we make sure flags == 0 */ + EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0); + + EXPECT_EQ(waitpid(pid, &status, 0), pid); + EXPECT_EQ(true, WIFEXITED(status)); + EXPECT_EQ(0, WEXITSTATUS(status)); + + /* Start children, and generate notifications */ + for (i = 0; i < ARRAY_SIZE(pids); i++) { + pid = fork(); + if (pid == 0) { + ret = syscall(__NR_getppid); + exit(ret != USER_NOTIF_MAGIC); + } + pids[i] = pid; + } + + /* This spins until all of the children are sleeping */ +restart_wait: + for (i = 0; i < ARRAY_SIZE(pids); i++) { + if (get_proc_stat(pids[i]) != 'S') { + nanosleep(&delay, NULL); + goto restart_wait; + } + } + + /* Read the notifications in order (and respond) */ + for (i = 0; i < ARRAY_SIZE(pids); i++) { + memset(&req, 0, sizeof(req)); + EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0); + EXPECT_EQ(req.id, baseid + i); + resp.id = req.id; + EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0); + } + + /* Make sure notifications were received */ + for (i = 0; i < ARRAY_SIZE(pids); i++) { + EXPECT_EQ(waitpid(pids[i], &status, 0), pids[i]); + EXPECT_EQ(true, WIFEXITED(status)); + EXPECT_EQ(0, WEXITSTATUS(status)); + } +} + /* * TODO: * - expand NNP testing |