[src/trunk]: src/tests/kernel Add new test fork2 in t_ptrace_wait*

[kamil <kamil%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/279e4386f91a
branches:  trunk
changeset: 348918:279e4386f91a
user:      kamil <kamil%NetBSD.org@localhost>
date:      Tue Nov 15 20:59:11 2016 +0000

description:
Add new test fork2 in t_ptrace_wait*

Verify that fork(2) is not intercepted by ptrace(2) with empty EVENT_MASK.

This test works with all wait(2)-like functions.

Debugger receives only SIGCHLD from tracee, when its the child of tracee
exits. Tracer notes nothing about fork(2) events.

Sponsored by <The NetBSD Foundation>

diffstat:

 tests/kernel/t_ptrace_wait.c |  83 ++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 81 insertions(+), 2 deletions(-)

diffs (111 lines):

diff -r 51df67a559b0 -r 279e4386f91a tests/kernel/t_ptrace_wait.c
--- a/tests/kernel/t_ptrace_wait.c      Tue Nov 15 20:50:28 2016 +0000
+++ b/tests/kernel/t_ptrace_wait.c      Tue Nov 15 20:59:11 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: t_ptrace_wait.c,v 1.16 2016/11/15 19:30:28 kamil Exp $ */
+/*     $NetBSD: t_ptrace_wait.c,v 1.17 2016/11/15 20:59:11 kamil Exp $ */
 
 /*-
  * Copyright (c) 2016 The NetBSD Foundation, Inc.
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: t_ptrace_wait.c,v 1.16 2016/11/15 19:30:28 kamil Exp $");
+__RCSID("$NetBSD: t_ptrace_wait.c,v 1.17 2016/11/15 20:59:11 kamil Exp $");
 
 #include <sys/param.h>
 #include <sys/types.h>
@@ -1721,6 +1721,84 @@
 }
 #endif
 
+ATF_TC(fork2);
+ATF_TC_HEAD(fork2, tc)
+{
+       atf_tc_set_md_var(tc, "descr",
+           "Verify that fork(2) is not intercepted by ptrace(2) with empty "
+           "EVENT_MASK");
+}
+
+ATF_TC_BODY(fork2, tc)
+{
+       const int exitval = 5;
+       const int exitval2 = 15;
+       const int sigval = SIGSTOP;
+       pid_t child, child2, wpid;
+#if defined(TWAIT_HAVE_STATUS)
+       int status;
+#endif
+       ptrace_event_t event;
+       const int elen = sizeof(event);
+
+       printf("Before forking process PID=%d\n", getpid());
+       child = atf_utils_fork();
+       if (child == 0) {
+               printf("Before calling PT_TRACE_ME from child %d\n", getpid());
+               FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);
+
+               printf("Before raising %s from child\n", strsignal(sigval));
+               FORKEE_ASSERT(raise(sigval) == 0);
+
+               FORKEE_ASSERT((child2 = fork()) != 1);
+
+               if (child2 == 0)
+                       _exit(exitval2);
+
+               FORKEE_REQUIRE_SUCCESS
+                   (wpid = TWAIT_GENERIC(child2, &status, 0), child2);
+
+               forkee_status_exited(status, exitval2);
+
+               printf("Before exiting of the child process\n");
+               _exit(exitval);
+       }
+       printf("Parent process PID=%d, child's PID=%d\n", getpid(), child);
+
+       printf("Before calling %s() for the child\n", TWAIT_FNAME);
+       TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+       validate_status_stopped(status, sigval);
+
+       printf("Set empty EVENT_MASK for the child %d\n", child);
+       event.pe_set_event = 0;
+       ATF_REQUIRE(ptrace(PT_SET_EVENT_MASK, child, &event, elen) != -1);
+
+       printf("Before resuming the child process where it left off and "
+           "without signal to be sent\n");
+       ATF_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
+
+       printf("Before calling %s() for the child - expected stopped "
+           "SIGCHLD\n", TWAIT_FNAME);
+       TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+       validate_status_stopped(status, SIGCHLD);
+
+       printf("Before resuming the child process where it left off and "
+           "without signal to be sent\n");
+       ATF_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
+
+       printf("Before calling %s() for the child - expected exited\n",
+           TWAIT_FNAME);
+       TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+       validate_status_exited(status, exitval);
+
+       printf("Before calling %s() for the child - expected no process\n",
+           TWAIT_FNAME);
+       TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
+}
+
 #if defined(TWAIT_HAVE_PID)
 #define ATF_TP_ADD_TC_HAVE_PID(a,b)    ATF_TP_ADD_TC(a,b)
 #else
@@ -1748,6 +1826,7 @@
        ATF_TP_ADD_TC(tp, eventmask2);
 
        ATF_TP_ADD_TC_HAVE_PID(tp, fork1);
+       ATF_TP_ADD_TC(tp, fork2);
 
        return atf_no_error();
 }