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[src/trunk]: src/tests/lib/libc/sys Move topology tests out of t_ptrace_wait....
details: https://anonhg.NetBSD.org/src/rev/cde623f8c45c
branches: trunk
changeset: 971803:cde623f8c45c
user: kamil <kamil%NetBSD.org@localhost>
date: Tue May 05 00:33:37 2020 +0000
description:
Move topology tests out of t_ptrace_wait.c to t_ptrace_topology_wait.h
The same tests are now included with the preprocessor in t_ptrace_wait.c.
No functional change intended.
diffstat:
tests/lib/libc/sys/t_ptrace_topology_wait.h | 721 ++++++++++++++++++++++++++++
tests/lib/libc/sys/t_ptrace_wait.c | 704 +---------------------------
2 files changed, 725 insertions(+), 700 deletions(-)
diffs (truncated from 1471 to 300 lines):
diff -r a68ab21b9a20 -r cde623f8c45c tests/lib/libc/sys/t_ptrace_topology_wait.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/lib/libc/sys/t_ptrace_topology_wait.h Tue May 05 00:33:37 2020 +0000
@@ -0,0 +1,721 @@
+/* $NetBSD: t_ptrace_topology_wait.h,v 1.1 2020/05/05 00:33:37 kamil Exp $ */
+
+/*-
+ * Copyright (c) 2016, 2017, 2018, 2019, 2020 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+ATF_TC(traceme_pid1_parent);
+ATF_TC_HEAD(traceme_pid1_parent, tc)
+{
+ atf_tc_set_md_var(tc, "descr",
+ "Verify that PT_TRACE_ME is not allowed when our parent is PID1");
+}
+
+ATF_TC_BODY(traceme_pid1_parent, tc)
+{
+ struct msg_fds parent_child;
+ int exitval_child1 = 1, exitval_child2 = 2;
+ pid_t child1, child2, wpid;
+ uint8_t msg = 0xde; /* dummy message for IPC based on pipe(2) */
+#if defined(TWAIT_HAVE_STATUS)
+ int status;
+#endif
+
+ SYSCALL_REQUIRE(msg_open(&parent_child) == 0);
+
+ DPRINTF("Before forking process PID=%d\n", getpid());
+ SYSCALL_REQUIRE((child1 = fork()) != -1);
+ if (child1 == 0) {
+ DPRINTF("Before forking process PID=%d\n", getpid());
+ SYSCALL_REQUIRE((child2 = fork()) != -1);
+ if (child2 != 0) {
+ DPRINTF("Parent process PID=%d, child2's PID=%d\n",
+ getpid(), child2);
+ _exit(exitval_child1);
+ }
+ CHILD_FROM_PARENT("exit child1", parent_child, msg);
+
+ DPRINTF("Assert that our parent is PID1 (initproc)\n");
+ FORKEE_ASSERT_EQ(getppid(), 1);
+
+ DPRINTF("Before calling PT_TRACE_ME from child %d\n", getpid());
+ FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) == -1);
+ SYSCALL_REQUIRE_ERRNO(errno, EPERM);
+
+ CHILD_TO_PARENT("child2 exiting", parent_child, msg);
+
+ _exit(exitval_child2);
+ }
+ DPRINTF("Parent process PID=%d, child1's PID=%d\n", getpid(), child1);
+
+ DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
+ TWAIT_REQUIRE_SUCCESS(
+ wpid = TWAIT_GENERIC(child1, &status, WEXITED), child1);
+
+ validate_status_exited(status, exitval_child1);
+
+ DPRINTF("Notify that child1 is dead\n");
+ PARENT_TO_CHILD("exit child1", parent_child, msg);
+
+ DPRINTF("Wait for exiting of child2\n");
+ PARENT_FROM_CHILD("child2 exiting", parent_child, msg);
+}
+
+/// ----------------------------------------------------------------------------
+
+#if defined(TWAIT_HAVE_PID)
+static void
+tracer_sees_terminaton_before_the_parent_raw(bool notimeout, bool unrelated,
+ bool stopped)
+{
+ /*
+ * notimeout - disable timeout in await zombie function
+ * unrelated - attach from unrelated tracer reparented to initproc
+ * stopped - attach to a stopped process
+ */
+
+ struct msg_fds parent_tracee, parent_tracer;
+ const int exitval_tracee = 5;
+ const int exitval_tracer = 10;
+ pid_t tracee, tracer, wpid;
+ uint8_t msg = 0xde; /* dummy message for IPC based on pipe(2) */
+#if defined(TWAIT_HAVE_STATUS)
+ int status;
+#endif
+
+ /*
+ * Only a subset of options are supported.
+ */
+ ATF_REQUIRE((!notimeout && !unrelated && !stopped) ||
+ (!notimeout && unrelated && !stopped) ||
+ (notimeout && !unrelated && !stopped) ||
+ (!notimeout && unrelated && stopped));
+
+ DPRINTF("Spawn tracee\n");
+ SYSCALL_REQUIRE(msg_open(&parent_tracee) == 0);
+ tracee = atf_utils_fork();
+ if (tracee == 0) {
+ if (stopped) {
+ DPRINTF("Stop self PID %d\n", getpid());
+ raise(SIGSTOP);
+ }
+
+ // Wait for parent to let us exit
+ CHILD_FROM_PARENT("exit tracee", parent_tracee, msg);
+ _exit(exitval_tracee);
+ }
+
+ DPRINTF("Spawn debugger\n");
+ SYSCALL_REQUIRE(msg_open(&parent_tracer) == 0);
+ tracer = atf_utils_fork();
+ if (tracer == 0) {
+ if(unrelated) {
+ /* Fork again and drop parent to reattach to PID 1 */
+ tracer = atf_utils_fork();
+ if (tracer != 0)
+ _exit(exitval_tracer);
+ }
+
+ if (stopped) {
+ DPRINTF("Await for a stopped parent PID %d\n", tracee);
+ await_stopped(tracee);
+ }
+
+ DPRINTF("Before calling PT_ATTACH from tracee %d\n", getpid());
+ FORKEE_ASSERT(ptrace(PT_ATTACH, tracee, NULL, 0) != -1);
+
+ /* Wait for tracee and assert that it was stopped w/ SIGSTOP */
+ FORKEE_REQUIRE_SUCCESS(
+ wpid = TWAIT_GENERIC(tracee, &status, 0), tracee);
+
+ forkee_status_stopped(status, SIGSTOP);
+
+ /* Resume tracee with PT_CONTINUE */
+ FORKEE_ASSERT(ptrace(PT_CONTINUE, tracee, (void *)1, 0) != -1);
+
+ /* Inform parent that tracer has attached to tracee */
+ CHILD_TO_PARENT("tracer ready", parent_tracer, msg);
+
+ /* Wait for parent to tell use that tracee should have exited */
+ CHILD_FROM_PARENT("wait for tracee exit", parent_tracer, msg);
+
+ /* Wait for tracee and assert that it exited */
+ FORKEE_REQUIRE_SUCCESS(
+ wpid = TWAIT_GENERIC(tracee, &status, 0), tracee);
+
+ forkee_status_exited(status, exitval_tracee);
+ DPRINTF("Tracee %d exited with %d\n", tracee, exitval_tracee);
+
+ DPRINTF("Before exiting of the tracer process\n");
+ _exit(unrelated ? 0 /* collect by initproc */ : exitval_tracer);
+ }
+
+ if (unrelated) {
+ DPRINTF("Wait for the tracer process (direct child) to exit "
+ "calling %s()\n", TWAIT_FNAME);
+ TWAIT_REQUIRE_SUCCESS(
+ wpid = TWAIT_GENERIC(tracer, &status, 0), tracer);
+
+ validate_status_exited(status, exitval_tracer);
+
+ DPRINTF("Wait for the non-exited tracee process with %s()\n",
+ TWAIT_FNAME);
+ TWAIT_REQUIRE_SUCCESS(
+ wpid = TWAIT_GENERIC(tracee, NULL, WNOHANG), 0);
+ }
+
+ DPRINTF("Wait for the tracer to attach to the tracee\n");
+ PARENT_FROM_CHILD("tracer ready", parent_tracer, msg);
+
+ DPRINTF("Resume the tracee and let it exit\n");
+ PARENT_TO_CHILD("exit tracee", parent_tracee, msg);
+
+ DPRINTF("Detect that tracee is zombie\n");
+ if (notimeout)
+ await_zombie_raw(tracee, 0);
+ else
+ await_zombie(tracee);
+
+ DPRINTF("Assert that there is no status about tracee %d - "
+ "Tracer must detect zombie first - calling %s()\n", tracee,
+ TWAIT_FNAME);
+ TWAIT_REQUIRE_SUCCESS(
+ wpid = TWAIT_GENERIC(tracee, &status, WNOHANG), 0);
+
+ if (unrelated) {
+ DPRINTF("Resume the tracer and let it detect exited tracee\n");
+ PARENT_TO_CHILD("Message 2", parent_tracer, msg);
+ } else {
+ DPRINTF("Tell the tracer child should have exited\n");
+ PARENT_TO_CHILD("wait for tracee exit", parent_tracer, msg);
+ DPRINTF("Wait for tracer to finish its job and exit - calling "
+ "%s()\n", TWAIT_FNAME);
+
+ DPRINTF("Wait from tracer child to complete waiting for "
+ "tracee\n");
+ TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(tracer, &status, 0),
+ tracer);
+
+ validate_status_exited(status, exitval_tracer);
+ }
+
+ DPRINTF("Wait for tracee to finish its job and exit - calling %s()\n",
+ TWAIT_FNAME);
+ TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(tracee, &status, 0), tracee);
+
+ validate_status_exited(status, exitval_tracee);
+
+ msg_close(&parent_tracer);
+ msg_close(&parent_tracee);
+}
+
+ATF_TC(tracer_sees_terminaton_before_the_parent);
+ATF_TC_HEAD(tracer_sees_terminaton_before_the_parent, tc)
+{
+ atf_tc_set_md_var(tc, "descr",
+ "Assert that tracer sees process termination before the parent");
+}
+
+ATF_TC_BODY(tracer_sees_terminaton_before_the_parent, tc)
+{
+
+ tracer_sees_terminaton_before_the_parent_raw(false, false, false);
+}
+
+ATF_TC(tracer_sysctl_lookup_without_duplicates);
+ATF_TC_HEAD(tracer_sysctl_lookup_without_duplicates, tc)
+{
+ atf_tc_set_md_var(tc, "timeout", "15");
+ atf_tc_set_md_var(tc, "descr",
+ "Assert that await_zombie() in attach1 always finds a single "
+ "process and no other error is reported");
+}
+
+ATF_TC_BODY(tracer_sysctl_lookup_without_duplicates, tc)
+{
+ time_t start, end;
+ double diff;
+ unsigned long N = 0;
+
+ /*
+ * Reuse this test with tracer_sees_terminaton_before_the_parent_raw().
+ * This test body isn't specific to this race, however it's just good
+ * enough for this purposes, no need to invent a dedicated code flow.
+ */
+
+ start = time(NULL);
+ while (true) {
+ DPRINTF("Step: %lu\n", N);
+ tracer_sees_terminaton_before_the_parent_raw(true, false,
+ false);
+ end = time(NULL);
+ diff = difftime(end, start);
+ if (diff >= 5.0)
+ break;
+ ++N;
+ }
+ DPRINTF("Iterations: %lu\n", N);
+}
+
+ATF_TC(unrelated_tracer_sees_terminaton_before_the_parent);
+ATF_TC_HEAD(unrelated_tracer_sees_terminaton_before_the_parent, tc)
+{
+ atf_tc_set_md_var(tc, "descr",
+ "Assert that tracer sees process termination before the parent");
+}
+
+ATF_TC_BODY(unrelated_tracer_sees_terminaton_before_the_parent, tc)
+{
+
+ tracer_sees_terminaton_before_the_parent_raw(false, true, false);
+}
+
+ATF_TC(tracer_attach_to_unrelated_stopped_process);
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